AI Trajectory

null

{
  "EnableConfigs": [
    "IEEE802154",
    "IEEE802154_SOCKET",
    "IPV6",
    "PHONET",
    "TLS"
  ],
  "FocusSymbols": [
    "dgram_getsockopt",
    "rawv6_getsockopt",
    "pep_getsockopt",
    "tls_getsockopt"
  ],
  "Reasoning": "The patch modifies the getsockopt implementations for IEEE 802.15.4 dgram, IPv6 raw, Phonet PEP, and TLS sockets to use the new sockopt_t interface and copy_to_iter instead of copy_to_user. This is a functional change in how socket options are read by user space, and it affects core networking protocols. Fuzzing these getsockopt handlers is important to ensure no regressions or memory corruption issues were introduced during the conversion.",
  "WorthFuzzing": true
}

null

{
  "PatchDiff": "commit f4724a5486f2b7e998a37005dfbb66781dffbe2d\nAuthor: syz-cluster \u003ctriage@syzkaller.com\u003e\nDate:   Mon Jul 27 21:17:45 2026 +0000\n\n    syz-cluster: applied patch under review\n\ndiff --git a/net/ieee802154/socket.c b/net/ieee802154/socket.c\nindex 85dce296d75139..5a36e87893f647 100644\n--- a/net/ieee802154/socket.c\n+++ b/net/ieee802154/socket.c\n@@ -831,20 +831,12 @@ static int ieee802154_dgram_deliver(struct net_device *dev, struct sk_buff *skb)\n \treturn ret;\n }\n \n-static int dgram_getsockopt(struct sock *sk, int level, int optname,\n-\t\t\t    char __user *optval, int __user *optlen)\n+static int do_dgram_getsockopt(struct sock *sk, int optname, sockopt_t *opt)\n {\n \tstruct dgram_sock *ro = dgram_sk(sk);\n-\n \tint val, len;\n \n-\tif (level != SOL_IEEE802154)\n-\t\treturn -EOPNOTSUPP;\n-\n-\tif (get_user(len, optlen))\n-\t\treturn -EFAULT;\n-\n-\tlen = min_t(unsigned int, len, sizeof(int));\n+\tlen = umin(sizeof(int), opt-\u003eoptlen);\n \n \tswitch (optname) {\n \tcase WPAN_WANTACK:\n@@ -871,10 +863,32 @@ static int dgram_getsockopt(struct sock *sk, int level, int optname,\n \t\treturn -ENOPROTOOPT;\n \t}\n \n-\tif (put_user(len, optlen))\n+\topt-\u003eoptlen = len;\n+\tif (copy_to_iter(\u0026val, len, \u0026opt-\u003eiter_out) != len)\n \t\treturn -EFAULT;\n-\tif (copy_to_user(optval, \u0026val, len))\n+\treturn 0;\n+}\n+\n+static int dgram_getsockopt(struct sock *sk, int level, int optname,\n+\t\t\t    char __user *optval, int __user *optlen)\n+{\n+\tsockopt_t opt;\n+\tint err;\n+\n+\tif (level != SOL_IEEE802154)\n+\t\treturn -EOPNOTSUPP;\n+\n+\terr = sockopt_init_user(\u0026opt, optval, optlen);\n+\tif (err)\n+\t\treturn err;\n+\n+\terr = do_dgram_getsockopt(sk, optname, \u0026opt);\n+\tif (err)\n+\t\treturn err;\n+\n+\tif (put_user(opt.optlen, optlen))\n \t\treturn -EFAULT;\n+\n \treturn 0;\n }\n \ndiff --git a/net/ipv6/raw.c b/net/ipv6/raw.c\nindex 3cc58698cbbd3a..c36152d2295b89 100644\n--- a/net/ipv6/raw.c\n+++ b/net/ipv6/raw.c\n@@ -1051,14 +1051,12 @@ static int rawv6_setsockopt(struct sock *sk, int level, int optname,\n \treturn do_rawv6_setsockopt(sk, level, optname, optval, optlen);\n }\n \n-static int do_rawv6_getsockopt(struct sock *sk, int level, int optname,\n-\t\t\t    char __user *optval, int __user *optlen)\n+static int do_rawv6_getsockopt(struct sock *sk, int optname, sockopt_t *opt)\n {\n \tstruct raw6_sock *rp = raw6_sk(sk);\n \tint val, len;\n \n-\tif (get_user(len, optlen))\n-\t\treturn -EFAULT;\n+\tlen = opt-\u003eoptlen;\n \n \tswitch (optname) {\n \tcase IPV6_HDRINCL:\n@@ -1080,11 +1078,10 @@ static int do_rawv6_getsockopt(struct sock *sk, int level, int optname,\n \t\treturn -ENOPROTOOPT;\n \t}\n \n-\tlen = min_t(unsigned int, sizeof(int), len);\n+\tlen = umin(sizeof(int), len);\n \n-\tif (put_user(len, optlen))\n-\t\treturn -EFAULT;\n-\tif (copy_to_user(optval, \u0026val, len))\n+\topt-\u003eoptlen = len;\n+\tif (copy_to_iter(\u0026val, len, \u0026opt-\u003eiter_out) != len)\n \t\treturn -EFAULT;\n \treturn 0;\n }\n@@ -1092,6 +1089,9 @@ static int do_rawv6_getsockopt(struct sock *sk, int level, int optname,\n static int rawv6_getsockopt(struct sock *sk, int level, int optname,\n \t\t\t  char __user *optval, int __user *optlen)\n {\n+\tsockopt_t opt;\n+\tint err;\n+\n \tswitch (level) {\n \tcase SOL_RAW:\n \t\tbreak;\n@@ -1109,7 +1109,18 @@ static int rawv6_getsockopt(struct sock *sk, int level, int optname,\n \t\treturn ipv6_getsockopt(sk, level, optname, optval, optlen);\n \t}\n \n-\treturn do_rawv6_getsockopt(sk, level, optname, optval, optlen);\n+\terr = sockopt_init_user(\u0026opt, optval, optlen);\n+\tif (err)\n+\t\treturn err;\n+\n+\terr = do_rawv6_getsockopt(sk, optname, \u0026opt);\n+\tif (err)\n+\t\treturn err;\n+\n+\tif (put_user(opt.optlen, optlen))\n+\t\treturn -EFAULT;\n+\n+\treturn 0;\n }\n \n static int rawv6_ioctl(struct sock *sk, int cmd, int *karg)\ndiff --git a/net/phonet/pep.c b/net/phonet/pep.c\nindex 7069271393933e..7ef4a9a240ef8c 100644\n--- a/net/phonet/pep.c\n+++ b/net/phonet/pep.c\n@@ -1078,17 +1078,11 @@ static int pep_setsockopt(struct sock *sk, int level, int optname,\n \treturn err;\n }\n \n-static int pep_getsockopt(struct sock *sk, int level, int optname,\n-\t\t\t\tchar __user *optval, int __user *optlen)\n+static int do_pep_getsockopt(struct sock *sk, int optname, sockopt_t *opt)\n {\n \tstruct pep_sock *pn = pep_sk(sk);\n \tint len, val;\n \n-\tif (level != SOL_PNPIPE)\n-\t\treturn -ENOPROTOOPT;\n-\tif (get_user(len, optlen))\n-\t\treturn -EFAULT;\n-\n \tswitch (optname) {\n \tcase PNPIPE_ENCAP:\n \t\tval = pn-\u003eifindex ? PNPIPE_ENCAP_IP : PNPIPE_ENCAP_NONE;\n@@ -1112,11 +1106,33 @@ static int pep_getsockopt(struct sock *sk, int level, int optname,\n \t\treturn -ENOPROTOOPT;\n \t}\n \n-\tlen = min_t(unsigned int, sizeof(int), len);\n-\tif (put_user(len, optlen))\n+\tlen = umin(sizeof(int), opt-\u003eoptlen);\n+\topt-\u003eoptlen = len;\n+\tif (copy_to_iter(\u0026val, len, \u0026opt-\u003eiter_out) != len)\n \t\treturn -EFAULT;\n-\tif (put_user(val, (int __user *) optval))\n+\treturn 0;\n+}\n+\n+static int pep_getsockopt(struct sock *sk, int level, int optname,\n+\t\t\t  char __user *optval, int __user *optlen)\n+{\n+\tsockopt_t opt;\n+\tint err;\n+\n+\tif (level != SOL_PNPIPE)\n+\t\treturn -ENOPROTOOPT;\n+\n+\terr = sockopt_init_user(\u0026opt, optval, optlen);\n+\tif (err)\n+\t\treturn err;\n+\n+\terr = do_pep_getsockopt(sk, optname, \u0026opt);\n+\tif (err)\n+\t\treturn err;\n+\n+\tif (put_user(opt.optlen, optlen))\n \t\treturn -EFAULT;\n+\n \treturn 0;\n }\n \ndiff --git a/net/tls/tls_main.c b/net/tls/tls_main.c\nindex 8c588cdab733da..fbb274287aa5f2 100644\n--- a/net/tls/tls_main.c\n+++ b/net/tls/tls_main.c\n@@ -424,20 +424,16 @@ static __poll_t tls_sk_poll(struct file *file, struct socket *sock,\n \treturn mask;\n }\n \n-static int do_tls_getsockopt_conf(struct sock *sk, char __user *optval,\n-\t\t\t\t  int __user *optlen, int tx)\n+static int do_tls_getsockopt_conf(struct sock *sk, sockopt_t *opt, int tx)\n {\n \tint rc = 0;\n \tconst struct tls_cipher_desc *cipher_desc;\n \tstruct tls_context *ctx = tls_get_ctx(sk);\n \tstruct tls_crypto_info *crypto_info;\n \tstruct cipher_context *cctx;\n-\tint len;\n+\tint len = opt-\u003eoptlen;\n \n-\tif (get_user(len, optlen))\n-\t\treturn -EFAULT;\n-\n-\tif (!optval || (len \u003c sizeof(*crypto_info))) {\n+\tif (!opt-\u003eiter_out.ubuf || len \u003c sizeof(*crypto_info)) {\n \t\trc = -EINVAL;\n \t\tgoto out;\n \t}\n@@ -462,7 +458,8 @@ static int do_tls_getsockopt_conf(struct sock *sk, char __user *optval,\n \t}\n \n \tif (len == sizeof(*crypto_info)) {\n-\t\tif (copy_to_user(optval, crypto_info, sizeof(*crypto_info)))\n+\t\tif (copy_to_iter(crypto_info, sizeof(*crypto_info),\n+\t\t\t\t \u0026opt-\u003eiter_out) != sizeof(*crypto_info))\n \t\t\trc = -EFAULT;\n \t\tgoto out;\n \t}\n@@ -478,44 +475,38 @@ static int do_tls_getsockopt_conf(struct sock *sk, char __user *optval,\n \tmemcpy(crypto_info_rec_seq(crypto_info, cipher_desc),\n \t       cctx-\u003erec_seq, cipher_desc-\u003erec_seq);\n \n-\tif (copy_to_user(optval, crypto_info, cipher_desc-\u003ecrypto_info))\n+\tif (copy_to_iter(crypto_info, cipher_desc-\u003ecrypto_info,\n+\t\t\t \u0026opt-\u003eiter_out) != cipher_desc-\u003ecrypto_info)\n \t\trc = -EFAULT;\n \n out:\n \treturn rc;\n }\n \n-static int do_tls_getsockopt_tx_zc(struct sock *sk, char __user *optval,\n-\t\t\t\t   int __user *optlen)\n+static int do_tls_getsockopt_tx_zc(struct sock *sk, sockopt_t *opt)\n {\n \tstruct tls_context *ctx = tls_get_ctx(sk);\n \tunsigned int value;\n-\tint len;\n-\n-\tif (get_user(len, optlen))\n-\t\treturn -EFAULT;\n+\tint len = opt-\u003eoptlen;\n \n \tif (len != sizeof(value))\n \t\treturn -EINVAL;\n \n \tvalue = ctx-\u003ezerocopy_sendfile;\n-\tif (copy_to_user(optval, \u0026value, sizeof(value)))\n+\tif (copy_to_iter(\u0026value, sizeof(value), \u0026opt-\u003eiter_out) != sizeof(value))\n \t\treturn -EFAULT;\n \n \treturn 0;\n }\n \n-static int do_tls_getsockopt_no_pad(struct sock *sk, char __user *optval,\n-\t\t\t\t    int __user *optlen)\n+static int do_tls_getsockopt_no_pad(struct sock *sk, sockopt_t *opt)\n {\n \tstruct tls_context *ctx = tls_get_ctx(sk);\n-\tint value, len;\n+\tint value, len = opt-\u003eoptlen;\n \n \tif (ctx-\u003eprot_info.version != TLS_1_3_VERSION)\n \t\treturn -EINVAL;\n \n-\tif (get_user(len, optlen))\n-\t\treturn -EFAULT;\n \tif (len \u003c sizeof(value))\n \t\treturn -EINVAL;\n \n@@ -525,38 +516,31 @@ static int do_tls_getsockopt_no_pad(struct sock *sk, char __user *optval,\n \tif (value \u003c 0)\n \t\treturn value;\n \n-\tif (put_user(sizeof(value), optlen))\n-\t\treturn -EFAULT;\n-\tif (copy_to_user(optval, \u0026value, sizeof(value)))\n+\topt-\u003eoptlen = sizeof(value);\n+\tif (copy_to_iter(\u0026value, sizeof(value), \u0026opt-\u003eiter_out) != sizeof(value))\n \t\treturn -EFAULT;\n \n \treturn 0;\n }\n \n-static int do_tls_getsockopt_tx_payload_len(struct sock *sk, char __user *optval,\n-\t\t\t\t\t    int __user *optlen)\n+static int do_tls_getsockopt_tx_payload_len(struct sock *sk, sockopt_t *opt)\n {\n \tstruct tls_context *ctx = tls_get_ctx(sk);\n \tu16 payload_len = ctx-\u003etx_max_payload_len;\n-\tint len;\n-\n-\tif (get_user(len, optlen))\n-\t\treturn -EFAULT;\n+\tint len = opt-\u003eoptlen;\n \n \tif (len \u003c sizeof(payload_len))\n \t\treturn -EINVAL;\n \n-\tif (put_user(sizeof(payload_len), optlen))\n-\t\treturn -EFAULT;\n-\n-\tif (copy_to_user(optval, \u0026payload_len, sizeof(payload_len)))\n+\topt-\u003eoptlen = sizeof(payload_len);\n+\tif (copy_to_iter(\u0026payload_len, sizeof(payload_len),\n+\t\t\t \u0026opt-\u003eiter_out) != sizeof(payload_len))\n \t\treturn -EFAULT;\n \n \treturn 0;\n }\n \n-static int do_tls_getsockopt(struct sock *sk, int optname,\n-\t\t\t     char __user *optval, int __user *optlen)\n+static int do_tls_getsockopt(struct sock *sk, int optname, sockopt_t *opt)\n {\n \tint rc = 0;\n \n@@ -565,17 +549,16 @@ static int do_tls_getsockopt(struct sock *sk, int optname,\n \tswitch (optname) {\n \tcase TLS_TX:\n \tcase TLS_RX:\n-\t\trc = do_tls_getsockopt_conf(sk, optval, optlen,\n-\t\t\t\t\t    optname == TLS_TX);\n+\t\trc = do_tls_getsockopt_conf(sk, opt, optname == TLS_TX);\n \t\tbreak;\n \tcase TLS_TX_ZEROCOPY_RO:\n-\t\trc = do_tls_getsockopt_tx_zc(sk, optval, optlen);\n+\t\trc = do_tls_getsockopt_tx_zc(sk, opt);\n \t\tbreak;\n \tcase TLS_RX_EXPECT_NO_PAD:\n-\t\trc = do_tls_getsockopt_no_pad(sk, optval, optlen);\n+\t\trc = do_tls_getsockopt_no_pad(sk, opt);\n \t\tbreak;\n \tcase TLS_TX_MAX_PAYLOAD_LEN:\n-\t\trc = do_tls_getsockopt_tx_payload_len(sk, optval, optlen);\n+\t\trc = do_tls_getsockopt_tx_payload_len(sk, opt);\n \t\tbreak;\n \tdefault:\n \t\trc = -ENOPROTOOPT;\n@@ -591,12 +574,25 @@ static int tls_getsockopt(struct sock *sk, int level, int optname,\n \t\t\t  char __user *optval, int __user *optlen)\n {\n \tstruct tls_context *ctx = tls_get_ctx(sk);\n+\tsockopt_t opt;\n+\tint err;\n \n \tif (level != SOL_TLS)\n \t\treturn ctx-\u003esk_proto-\u003egetsockopt(sk, level,\n \t\t\t\t\t\t optname, optval, optlen);\n \n-\treturn do_tls_getsockopt(sk, optname, optval, optlen);\n+\terr = sockopt_init_user(\u0026opt, optval, optlen);\n+\tif (err)\n+\t\treturn err;\n+\n+\terr = do_tls_getsockopt(sk, optname, \u0026opt);\n+\tif (err)\n+\t\treturn err;\n+\n+\tif (put_user(opt.optlen, optlen))\n+\t\treturn -EFAULT;\n+\n+\treturn 0;\n }\n \n static int validate_crypto_info(const struct tls_crypto_info *crypto_info,\ndiff --git a/tools/testing/selftests/net/getsockopt_iter.c b/tools/testing/selftests/net/getsockopt_iter.c\nindex fe5a5268bc34ec..974065a23fa825 100644\n--- a/tools/testing/selftests/net/getsockopt_iter.c\n+++ b/tools/testing/selftests/net/getsockopt_iter.c\n@@ -28,7 +28,10 @@\n #include \u003clinux/vm_sockets.h\u003e\n #include \u003clinux/icmp.h\u003e\n #include \u003cnetinet/in.h\u003e\n+#include \u003cnetinet/tcp.h\u003e\n+#include \u003carpa/inet.h\u003e\n #include \u003csys/socket.h\u003e\n+#include \u003clinux/tls.h\u003e\n #include \"kselftest_harness.h\"\n \n #ifndef AF_VSOCK\n@@ -40,6 +43,45 @@\n #ifndef ICMP_FILTER\n #define ICMP_FILTER 1\n #endif\n+#ifndef IPV6_HDRINCL\n+#define IPV6_HDRINCL 36\n+#endif\n+#ifndef IPV6_CHECKSUM\n+#define IPV6_CHECKSUM 7\n+#endif\n+#ifndef AF_IEEE802154\n+#define AF_IEEE802154 36\n+#endif\n+#ifndef SOL_IEEE802154\n+#define SOL_IEEE802154 0\n+#endif\n+#ifndef WPAN_WANTACK\n+#define WPAN_WANTACK 0\n+#endif\n+#ifndef AF_PHONET\n+#define AF_PHONET 35\n+#endif\n+#ifndef SOL_PNPIPE\n+#define SOL_PNPIPE 275\n+#endif\n+#ifndef PN_PROTO_PIPE\n+#define PN_PROTO_PIPE 2\n+#endif\n+#ifndef PNPIPE_ENCAP\n+#define PNPIPE_ENCAP 1\n+#endif\n+#ifndef PNPIPE_ENCAP_NONE\n+#define PNPIPE_ENCAP_NONE 0\n+#endif\n+#ifndef PNPIPE_ENCAP_IP\n+#define PNPIPE_ENCAP_IP 1\n+#endif\n+#ifndef SOL_TLS\n+#define SOL_TLS 282\n+#endif\n+#ifndef TCP_ULP\n+#define TCP_ULP 31\n+#endif\n \n /* ---------- netlink ---------- */\n \n@@ -394,4 +436,386 @@ TEST_F(raw, bad_optname)\n \tASSERT_EQ(sizeof(val), optlen);\n }\n \n+/* ---------- raw (ipv6) ---------- */\n+\n+FIXTURE(rawv6)\n+{\n+\tint fd;\n+};\n+\n+FIXTURE_SETUP(rawv6)\n+{\n+\tself-\u003efd = socket(AF_INET6, SOCK_RAW, IPPROTO_UDP);\n+\tif (self-\u003efd \u003c 0)\n+\t\tSKIP(return, \"SOCK_RAW/IPv6 socket: %s\", strerror(errno));\n+}\n+\n+FIXTURE_TEARDOWN(rawv6)\n+{\n+\tif (self-\u003efd \u003e= 0)\n+\t\tclose(self-\u003efd);\n+}\n+\n+TEST_F(rawv6, hdrincl_exact)\n+{\n+\tsocklen_t optlen;\n+\tint val = -1;\n+\n+\toptlen = sizeof(val);\n+\n+\tASSERT_EQ(0, getsockopt(self-\u003efd, IPPROTO_IPV6, IPV6_HDRINCL,\n+\t\t\t\t\u0026val, \u0026optlen));\n+\tASSERT_EQ(sizeof(int), optlen);\n+\tASSERT_TRUE(val == 0 || val == 1);\n+}\n+\n+TEST_F(rawv6, hdrincl_oversize_clamped)\n+{\n+\tchar buf[16] = {};\n+\tsocklen_t optlen = sizeof(buf);\n+\n+\tASSERT_EQ(0, getsockopt(self-\u003efd, IPPROTO_IPV6, IPV6_HDRINCL,\n+\t\t\t\tbuf, \u0026optlen));\n+\tASSERT_EQ(sizeof(int), optlen);\n+}\n+\n+/* Raw int options clamp the reported length down to the user buffer\n+ * instead of returning EINVAL on a short buffer.\n+ */\n+TEST_F(rawv6, hdrincl_undersize_clamped)\n+{\n+\tsocklen_t optlen = 2;\n+\tint val = 0;\n+\n+\tASSERT_EQ(0, getsockopt(self-\u003efd, IPPROTO_IPV6, IPV6_HDRINCL,\n+\t\t\t\t\u0026val, \u0026optlen));\n+\tASSERT_EQ(2, optlen);\n+}\n+\n+TEST_F(rawv6, checksum_default)\n+{\n+\tsocklen_t optlen;\n+\tint val = 0;\n+\n+\toptlen = sizeof(val);\n+\n+\t/* A non-ICMPv6 raw socket has the checksum disabled, reported as -1. */\n+\tASSERT_EQ(0, getsockopt(self-\u003efd, IPPROTO_IPV6, IPV6_CHECKSUM,\n+\t\t\t\t\u0026val, \u0026optlen));\n+\tASSERT_EQ(sizeof(int), optlen);\n+\tASSERT_EQ(-1, val);\n+}\n+\n+TEST_F(rawv6, bad_optname)\n+{\n+\tsocklen_t optlen;\n+\tint val;\n+\n+\toptlen = sizeof(val);\n+\n+\t/* SOL_RAW reaches do_rawv6_getsockopt() directly. */\n+\tASSERT_EQ(-1, getsockopt(self-\u003efd, SOL_RAW, 0x7fff, \u0026val, \u0026optlen));\n+\tASSERT_EQ(ENOPROTOOPT, errno);\n+\tASSERT_EQ(sizeof(val), optlen);\n+}\n+\n+/* ---------- ieee802154 (dgram) ---------- */\n+\n+FIXTURE(ieee802154)\n+{\n+\tint fd;\n+};\n+\n+FIXTURE_SETUP(ieee802154)\n+{\n+\tself-\u003efd = socket(AF_IEEE802154, SOCK_DGRAM, 0);\n+\tif (self-\u003efd \u003c 0)\n+\t\tSKIP(return, \"AF_IEEE802154 dgram socket: %s\", strerror(errno));\n+}\n+\n+FIXTURE_TEARDOWN(ieee802154)\n+{\n+\tif (self-\u003efd \u003e= 0)\n+\t\tclose(self-\u003efd);\n+}\n+\n+TEST_F(ieee802154, wantack_exact)\n+{\n+\tsocklen_t optlen;\n+\tint val = -1;\n+\n+\toptlen = sizeof(val);\n+\n+\tASSERT_EQ(0, getsockopt(self-\u003efd, SOL_IEEE802154, WPAN_WANTACK,\n+\t\t\t\t\u0026val, \u0026optlen));\n+\tASSERT_EQ(sizeof(int), optlen);\n+\tASSERT_TRUE(val == 0 || val == 1);\n+}\n+\n+TEST_F(ieee802154, wantack_oversize_clamped)\n+{\n+\tchar buf[16] = {};\n+\tsocklen_t optlen = sizeof(buf);\n+\n+\tASSERT_EQ(0, getsockopt(self-\u003efd, SOL_IEEE802154, WPAN_WANTACK,\n+\t\t\t\tbuf, \u0026optlen));\n+\tASSERT_EQ(sizeof(int), optlen);\n+}\n+\n+TEST_F(ieee802154, wantack_undersize_clamped)\n+{\n+\tsocklen_t optlen = 2;\n+\tint val = 0;\n+\n+\tASSERT_EQ(0, getsockopt(self-\u003efd, SOL_IEEE802154, WPAN_WANTACK,\n+\t\t\t\t\u0026val, \u0026optlen));\n+\tASSERT_EQ(2, optlen);\n+}\n+\n+TEST_F(ieee802154, bad_optname)\n+{\n+\tsocklen_t optlen;\n+\tint val;\n+\n+\toptlen = sizeof(val);\n+\n+\tASSERT_EQ(-1, getsockopt(self-\u003efd, SOL_IEEE802154, 0x7fff,\n+\t\t\t\t \u0026val, \u0026optlen));\n+\tASSERT_EQ(ENOPROTOOPT, errno);\n+\tASSERT_EQ(sizeof(val), optlen);\n+}\n+\n+/* dgram_getsockopt() rejects any level other than SOL_IEEE802154. */\n+TEST_F(ieee802154, bad_level)\n+{\n+\tsocklen_t optlen;\n+\tint val;\n+\n+\toptlen = sizeof(val);\n+\n+\tASSERT_EQ(-1, getsockopt(self-\u003efd, SOL_RAW, WPAN_WANTACK,\n+\t\t\t\t \u0026val, \u0026optlen));\n+\tASSERT_EQ(EOPNOTSUPP, errno);\n+\tASSERT_EQ(sizeof(val), optlen);\n+}\n+\n+/* ---------- phonet (pep) ---------- */\n+\n+FIXTURE(phonet)\n+{\n+\tint fd;\n+};\n+\n+FIXTURE_SETUP(phonet)\n+{\n+\tself-\u003efd = socket(AF_PHONET, SOCK_SEQPACKET, PN_PROTO_PIPE);\n+\tif (self-\u003efd \u003c 0)\n+\t\tSKIP(return, \"AF_PHONET pipe socket: %s\", strerror(errno));\n+}\n+\n+FIXTURE_TEARDOWN(phonet)\n+{\n+\tif (self-\u003efd \u003e= 0)\n+\t\tclose(self-\u003efd);\n+}\n+\n+TEST_F(phonet, encap_exact)\n+{\n+\tsocklen_t optlen;\n+\tint val = -1;\n+\n+\toptlen = sizeof(val);\n+\n+\tASSERT_EQ(0, getsockopt(self-\u003efd, SOL_PNPIPE, PNPIPE_ENCAP,\n+\t\t\t\t\u0026val, \u0026optlen));\n+\tASSERT_EQ(sizeof(int), optlen);\n+\tASSERT_TRUE(val == PNPIPE_ENCAP_NONE || val == PNPIPE_ENCAP_IP);\n+}\n+\n+TEST_F(phonet, encap_oversize_clamped)\n+{\n+\tchar buf[16] = {};\n+\tsocklen_t optlen = sizeof(buf);\n+\n+\tASSERT_EQ(0, getsockopt(self-\u003efd, SOL_PNPIPE, PNPIPE_ENCAP,\n+\t\t\t\tbuf, \u0026optlen));\n+\tASSERT_EQ(sizeof(int), optlen);\n+}\n+\n+/* pep clamps the reported length down to the user buffer. Use an\n+ * int-sized backing buffer with a short optlen so the baseline kernel,\n+ * which writes a full int via put_user(), does not scribble past it.\n+ */\n+TEST_F(phonet, encap_undersize_clamped)\n+{\n+\tsocklen_t optlen = 2;\n+\tint val = 0;\n+\n+\tASSERT_EQ(0, getsockopt(self-\u003efd, SOL_PNPIPE, PNPIPE_ENCAP,\n+\t\t\t\t\u0026val, \u0026optlen));\n+\tASSERT_EQ(2, optlen);\n+}\n+\n+TEST_F(phonet, bad_optname)\n+{\n+\tsocklen_t optlen;\n+\tint val;\n+\n+\toptlen = sizeof(val);\n+\n+\tASSERT_EQ(-1, getsockopt(self-\u003efd, SOL_PNPIPE, 0x7fff, \u0026val, \u0026optlen));\n+\tASSERT_EQ(ENOPROTOOPT, errno);\n+\tASSERT_EQ(sizeof(val), optlen);\n+}\n+\n+/* pep_getsockopt() rejects any level other than SOL_PNPIPE. */\n+TEST_F(phonet, bad_level)\n+{\n+\tsocklen_t optlen;\n+\tint val;\n+\n+\toptlen = sizeof(val);\n+\n+\tASSERT_EQ(-1, getsockopt(self-\u003efd, SOL_RAW, PNPIPE_ENCAP, \u0026val, \u0026optlen));\n+\tASSERT_EQ(ENOPROTOOPT, errno);\n+\tASSERT_EQ(sizeof(val), optlen);\n+}\n+\n+/* ---------- tls ---------- */\n+\n+FIXTURE(tls)\n+{\n+\tint fd;\n+\tint sfd;\n+};\n+\n+FIXTURE_SETUP(tls)\n+{\n+\tstruct sockaddr_in a = {\n+\t\t.sin_family = AF_INET,\n+\t\t.sin_addr.s_addr = htonl(INADDR_LOOPBACK),\n+\t};\n+\tsocklen_t alen = sizeof(a);\n+\tint lfd;\n+\n+\tself-\u003efd = -1;\n+\tself-\u003esfd = -1;\n+\n+\tlfd = socket(AF_INET, SOCK_STREAM, 0);\n+\tif (lfd \u003c 0)\n+\t\tSKIP(return, \"TCP socket: %s\", strerror(errno));\n+\tif (bind(lfd, (struct sockaddr *)\u0026a, sizeof(a)) || listen(lfd, 1) ||\n+\t    getsockname(lfd, (struct sockaddr *)\u0026a, \u0026alen)) {\n+\t\tclose(lfd);\n+\t\tSKIP(return, \"listener setup: %s\", strerror(errno));\n+\t}\n+\tself-\u003efd = socket(AF_INET, SOCK_STREAM, 0);\n+\tif (connect(self-\u003efd, (struct sockaddr *)\u0026a, sizeof(a))) {\n+\t\tclose(lfd);\n+\t\tSKIP(return, \"connect: %s\", strerror(errno));\n+\t}\n+\tself-\u003esfd = accept(lfd, NULL, NULL);\n+\tclose(lfd);\n+\tif (setsockopt(self-\u003efd, IPPROTO_TCP, TCP_ULP, \"tls\", sizeof(\"tls\")))\n+\t\tSKIP(return, \"TCP_ULP=tls: %s (built without TLS?)\",\n+\t\t     strerror(errno));\n+}\n+\n+FIXTURE_TEARDOWN(tls)\n+{\n+\tif (self-\u003efd \u003e= 0)\n+\t\tclose(self-\u003efd);\n+\tif (self-\u003esfd \u003e= 0)\n+\t\tclose(self-\u003esfd);\n+}\n+\n+/* do_tls_getsockopt_tx_zc(): fixed-size int, exact length required. */\n+TEST_F(tls, tx_zerocopy_exact)\n+{\n+\tsocklen_t optlen = sizeof(int);\n+\tint val = -1;\n+\n+\tASSERT_EQ(0, getsockopt(self-\u003efd, SOL_TLS, TLS_TX_ZEROCOPY_RO,\n+\t\t\t\t\u0026val, \u0026optlen));\n+\tASSERT_EQ(sizeof(int), optlen);\n+\tASSERT_TRUE(val == 0 || val == 1);\n+}\n+\n+TEST_F(tls, tx_zerocopy_wrong_len)\n+{\n+\tsocklen_t optlen = 2;\n+\tint val;\n+\n+\tASSERT_EQ(-1, getsockopt(self-\u003efd, SOL_TLS, TLS_TX_ZEROCOPY_RO,\n+\t\t\t\t \u0026val, \u0026optlen));\n+\tASSERT_EQ(EINVAL, errno);\n+}\n+\n+/* do_tls_getsockopt_conf(): NULL optval still yields EINVAL -- the\n+ * converted code tests opt-\u003eiter_out.ubuf in place of optval.\n+ */\n+TEST_F(tls, conf_null_optval)\n+{\n+\tsocklen_t optlen = 64;\n+\n+\tASSERT_EQ(-1, getsockopt(self-\u003efd, SOL_TLS, TLS_TX, NULL, \u0026optlen));\n+\tASSERT_EQ(EINVAL, errno);\n+}\n+\n+TEST_F(tls, conf_short)\n+{\n+\tsocklen_t optlen = 2;\n+\tchar buf[2];\n+\n+\tASSERT_EQ(-1, getsockopt(self-\u003efd, SOL_TLS, TLS_TX, buf, \u0026optlen));\n+\tASSERT_EQ(EINVAL, errno);\n+}\n+\n+/* TLS_TX before crypto is set reports not-ready. */\n+TEST_F(tls, conf_not_ready)\n+{\n+\tstruct tls_crypto_info info;\n+\tsocklen_t optlen = sizeof(info);\n+\n+\tASSERT_EQ(-1, getsockopt(self-\u003efd, SOL_TLS, TLS_TX, \u0026info, \u0026optlen));\n+\tASSERT_EQ(EBUSY, errno);\n+}\n+\n+/* Set TX crypto, then read it back at the base and full sizes, exercising\n+ * both copy_to_iter() branches. SKIP if AES-GCM is unavailable.\n+ */\n+TEST_F(tls, conf_crypto_roundtrip)\n+{\n+\tstruct tls12_crypto_info_aes_gcm_128 tx = {\n+\t\t.info.version = TLS_1_2_VERSION,\n+\t\t.info.cipher_type = TLS_CIPHER_AES_GCM_128,\n+\t};\n+\tstruct tls12_crypto_info_aes_gcm_128 full;\n+\tstruct tls_crypto_info base;\n+\tsocklen_t optlen;\n+\n+\tif (setsockopt(self-\u003efd, SOL_TLS, TLS_TX, \u0026tx, sizeof(tx)))\n+\t\tSKIP(return, \"set TLS_TX aes_gcm_128: %s\", strerror(errno));\n+\n+\toptlen = sizeof(base);\n+\tASSERT_EQ(0, getsockopt(self-\u003efd, SOL_TLS, TLS_TX, \u0026base, \u0026optlen));\n+\tASSERT_EQ(sizeof(base), optlen);\n+\tASSERT_EQ(TLS_1_2_VERSION, base.version);\n+\tASSERT_EQ(TLS_CIPHER_AES_GCM_128, base.cipher_type);\n+\n+\toptlen = sizeof(full);\n+\tASSERT_EQ(0, getsockopt(self-\u003efd, SOL_TLS, TLS_TX, \u0026full, \u0026optlen));\n+\tASSERT_EQ(sizeof(full), optlen);\n+\tASSERT_EQ(TLS_CIPHER_AES_GCM_128, full.info.cipher_type);\n+}\n+\n+TEST_F(tls, bad_optname)\n+{\n+\tsocklen_t optlen = sizeof(int);\n+\tint val;\n+\n+\tASSERT_EQ(-1, getsockopt(self-\u003efd, SOL_TLS, 0x7fff, \u0026val, \u0026optlen));\n+\tASSERT_EQ(ENOPROTOOPT, errno);\n+}\n+\n TEST_HARNESS_MAIN\n"
}

best-expensive

null

{
  "EnableConfigs": [
    "IEEE802154",
    "IEEE802154_SOCKET",
    "IPV6",
    "PHONET",
    "TLS"
  ],
  "FocusSymbols": [
    "dgram_getsockopt",
    "rawv6_getsockopt",
    "pep_getsockopt",
    "tls_getsockopt"
  ],
  "Reasoning": "The patch modifies the getsockopt implementations for IEEE 802.15.4 dgram, IPv6 raw, Phonet PEP, and TLS sockets to use the new sockopt_t interface and copy_to_iter instead of copy_to_user. This is a functional change in how socket options are read by user space, and it affects core networking protocols. Fuzzing these getsockopt handlers is important to ensure no regressions or memory corruption issues were introduced during the conversion.",
  "WorthFuzzing": true
}

You are an expert Linux kernel maintainer.
Your job is to review a provided patch series and determine
if it makes functional changes to the kernel that should be fuzzed.

IMPORTANT: The changes have ALREADY been applied and committed as the HEAD commit in
your workspace. Do NOT rely on your internal knowledge of the kernel. You must actively
use your code access tools to examine the actual source code and confirm any assumptions.

Return WorthFuzzing=false if the patch only contains:
- Modifications to Documentation/, Kconfig files, or code comments.
- Purely decorative changes, such as logging (e.g., pr_err, printk) or tracepoints.
- Changes to numeric constants or macros that do not functionally alter execution flow.
- Code paths that are impossible to reach in virtualized environments like GCE or QEMU,
  even when utilizing software-emulated hardware (e.g., usb gadget, mac80211_hwsim).
- Code in vendor-specific PCIe switch, SmartNIC, or GPU drivers (e.g., mlxsw, pds_core, qed,
  ionic, amdgpu) that require physical PCIe hardware cards not emulated in standard QEMU.
- Driver .remove, .shutdown, or pci_unregister_driver teardown callbacks (e.g., igb_remove)
  that are executed only during PCI hot-unplug or sysfs driver unbind operations.

If it modifies reachable core kernel logic, drivers, or architectures, use your code search
tools to verify the code can be executed, then return WorthFuzzing=true.

When returning WorthFuzzing=true, you MUST ALSO:
1. Extract any specific kernel functions that should be heavily fuzzed into FocusSymbols.
   Avoid listing generic hot-path functions to prevent skewed test distributions.
   Prefer non-static, non-inlined API entrypoint functions over internal static helper functions
   (which are inlined by the compiler and do not have distinct symbol addresses).
2. Identify any specific CONFIG_ options required to properly test this new/modified feature.
   Go and look into the Kconfig files and check for ifdefs around the code, do not make assumptions.
   Also check "depends on" lines in Kconfig to include any non-standard parent subsystem configs
   needed for Kbuild to compile the code statically into vmlinux. List them in the EnableConfigs
   output array, and DO NOT add a 'CONFIG_' prefix (e.g., return "NET_IPV4" instead of "CONFIG_NET_IPV4").
Prefer calling several tools at the same time to save round-trips.


Use set-results tool to provide results of the analysis.
It must be called exactly once before the final reply.
Ignore results of this tool.

For your convenience, here is the diff of the changes:
commit f4724a5486f2b7e998a37005dfbb66781dffbe2d
Author: syz-cluster <triage@syzkaller.com>
Date:   Mon Jul 27 21:17:45 2026 +0000

    syz-cluster: applied patch under review

diff --git a/net/ieee802154/socket.c b/net/ieee802154/socket.c
index 85dce296d75139..5a36e87893f647 100644
--- a/net/ieee802154/socket.c
+++ b/net/ieee802154/socket.c
@@ -831,20 +831,12 @@ static int ieee802154_dgram_deliver(struct net_device *dev, struct sk_buff *skb)
 	return ret;
 }
 
-static int dgram_getsockopt(struct sock *sk, int level, int optname,
-			    char __user *optval, int __user *optlen)
+static int do_dgram_getsockopt(struct sock *sk, int optname, sockopt_t *opt)
 {
 	struct dgram_sock *ro = dgram_sk(sk);
-
 	int val, len;
 
-	if (level != SOL_IEEE802154)
-		return -EOPNOTSUPP;
-
-	if (get_user(len, optlen))
-		return -EFAULT;
-
-	len = min_t(unsigned int, len, sizeof(int));
+	len = umin(sizeof(int), opt->optlen);
 
 	switch (optname) {
 	case WPAN_WANTACK:
@@ -871,10 +863,32 @@ static int dgram_getsockopt(struct sock *sk, int level, int optname,
 		return -ENOPROTOOPT;
 	}
 
-	if (put_user(len, optlen))
+	opt->optlen = len;
+	if (copy_to_iter(&val, len, &opt->iter_out) != len)
 		return -EFAULT;
-	if (copy_to_user(optval, &val, len))
+	return 0;
+}
+
+static int dgram_getsockopt(struct sock *sk, int level, int optname,
+			    char __user *optval, int __user *optlen)
+{
+	sockopt_t opt;
+	int err;
+
+	if (level != SOL_IEEE802154)
+		return -EOPNOTSUPP;
+
+	err = sockopt_init_user(&opt, optval, optlen);
+	if (err)
+		return err;
+
+	err = do_dgram_getsockopt(sk, optname, &opt);
+	if (err)
+		return err;
+
+	if (put_user(opt.optlen, optlen))
 		return -EFAULT;
+
 	return 0;
 }
 
diff --git a/net/ipv6/raw.c b/net/ipv6/raw.c
index 3cc58698cbbd3a..c36152d2295b89 100644
--- a/net/ipv6/raw.c
+++ b/net/ipv6/raw.c
@@ -1051,14 +1051,12 @@ static int rawv6_setsockopt(struct sock *sk, int level, int optname,
 	return do_rawv6_setsockopt(sk, level, optname, optval, optlen);
 }
 
-static int do_rawv6_getsockopt(struct sock *sk, int level, int optname,
-			    char __user *optval, int __user *optlen)
+static int do_rawv6_getsockopt(struct sock *sk, int optname, sockopt_t *opt)
 {
 	struct raw6_sock *rp = raw6_sk(sk);
 	int val, len;
 
-	if (get_user(len, optlen))
-		return -EFAULT;
+	len = opt->optlen;
 
 	switch (optname) {
 	case IPV6_HDRINCL:
@@ -1080,11 +1078,10 @@ static int do_rawv6_getsockopt(struct sock *sk, int level, int optname,
 		return -ENOPROTOOPT;
 	}
 
-	len = min_t(unsigned int, sizeof(int), len);
+	len = umin(sizeof(int), len);
 
-	if (put_user(len, optlen))
-		return -EFAULT;
-	if (copy_to_user(optval, &val, len))
+	opt->optlen = len;
+	if (copy_to_iter(&val, len, &opt->iter_out) != len)
 		return -EFAULT;
 	return 0;
 }
@@ -1092,6 +1089,9 @@ static int do_rawv6_getsockopt(struct sock *sk, int level, int optname,
 static int rawv6_getsockopt(struct sock *sk, int level, int optname,
 			  char __user *optval, int __user *optlen)
 {
+	sockopt_t opt;
+	int err;
+
 	switch (level) {
 	case SOL_RAW:
 		break;
@@ -1109,7 +1109,18 @@ static int rawv6_getsockopt(struct sock *sk, int level, int optname,
 		return ipv6_getsockopt(sk, level, optname, optval, optlen);
 	}
 
-	return do_rawv6_getsockopt(sk, level, optname, optval, optlen);
+	err = sockopt_init_user(&opt, optval, optlen);
+	if (err)
+		return err;
+
+	err = do_rawv6_getsockopt(sk, optname, &opt);
+	if (err)
+		return err;
+
+	if (put_user(opt.optlen, optlen))
+		return -EFAULT;
+
+	return 0;
 }
 
 static int rawv6_ioctl(struct sock *sk, int cmd, int *karg)
diff --git a/net/phonet/pep.c b/net/phonet/pep.c
index 7069271393933e..7ef4a9a240ef8c 100644
--- a/net/phonet/pep.c
+++ b/net/phonet/pep.c
@@ -1078,17 +1078,11 @@ static int pep_setsockopt(struct sock *sk, int level, int optname,
 	return err;
 }
 
-static int pep_getsockopt(struct sock *sk, int level, int optname,
-				char __user *optval, int __user *optlen)
+static int do_pep_getsockopt(struct sock *sk, int optname, sockopt_t *opt)
 {
 	struct pep_sock *pn = pep_sk(sk);
 	int len, val;
 
-	if (level != SOL_PNPIPE)
-		return -ENOPROTOOPT;
-	if (get_user(len, optlen))
-		return -EFAULT;
-
 	switch (optname) {
 	case PNPIPE_ENCAP:
 		val = pn->ifindex ? PNPIPE_ENCAP_IP : PNPIPE_ENCAP_NONE;
@@ -1112,11 +1106,33 @@ static int pep_getsockopt(struct sock *sk, int level, int optname,
 		return -ENOPROTOOPT;
 	}
 
-	len = min_t(unsigned int, sizeof(int), len);
-	if (put_user(len, optlen))
+	len = umin(sizeof(int), opt->optlen);
+	opt->optlen = len;
+	if (copy_to_iter(&val, len, &opt->iter_out) != len)
 		return -EFAULT;
-	if (put_user(val, (int __user *) optval))
+	return 0;
+}
+
+static int pep_getsockopt(struct sock *sk, int level, int optname,
+			  char __user *optval, int __user *optlen)
+{
+	sockopt_t opt;
+	int err;
+
+	if (level != SOL_PNPIPE)
+		return -ENOPROTOOPT;
+
+	err = sockopt_init_user(&opt, optval, optlen);
+	if (err)
+		return err;
+
+	err = do_pep_getsockopt(sk, optname, &opt);
+	if (err)
+		return err;
+
+	if (put_user(opt.optlen, optlen))
 		return -EFAULT;
+
 	return 0;
 }
 
diff --git a/net/tls/tls_main.c b/net/tls/tls_main.c
index 8c588cdab733da..fbb274287aa5f2 100644
--- a/net/tls/tls_main.c
+++ b/net/tls/tls_main.c
@@ -424,20 +424,16 @@ static __poll_t tls_sk_poll(struct file *file, struct socket *sock,
 	return mask;
 }
 
-static int do_tls_getsockopt_conf(struct sock *sk, char __user *optval,
-				  int __user *optlen, int tx)
+static int do_tls_getsockopt_conf(struct sock *sk, sockopt_t *opt, int tx)
 {
 	int rc = 0;
 	const struct tls_cipher_desc *cipher_desc;
 	struct tls_context *ctx = tls_get_ctx(sk);
 	struct tls_crypto_info *crypto_info;
 	struct cipher_context *cctx;
-	int len;
+	int len = opt->optlen;
 
-	if (get_user(len, optlen))
-		return -EFAULT;
-
-	if (!optval || (len < sizeof(*crypto_info))) {
+	if (!opt->iter_out.ubuf || len < sizeof(*crypto_info)) {
 		rc = -EINVAL;
 		goto out;
 	}
@@ -462,7 +458,8 @@ static int do_tls_getsockopt_conf(struct sock *sk, char __user *optval,
 	}
 
 	if (len == sizeof(*crypto_info)) {
-		if (copy_to_user(optval, crypto_info, sizeof(*crypto_info)))
+		if (copy_to_iter(crypto_info, sizeof(*crypto_info),
+				 &opt->iter_out) != sizeof(*crypto_info))
 			rc = -EFAULT;
 		goto out;
 	}
@@ -478,44 +475,38 @@ static int do_tls_getsockopt_conf(struct sock *sk, char __user *optval,
 	memcpy(crypto_info_rec_seq(crypto_info, cipher_desc),
 	       cctx->rec_seq, cipher_desc->rec_seq);
 
-	if (copy_to_user(optval, crypto_info, cipher_desc->crypto_info))
+	if (copy_to_iter(crypto_info, cipher_desc->crypto_info,
+			 &opt->iter_out) != cipher_desc->crypto_info)
 		rc = -EFAULT;
 
 out:
 	return rc;
 }
 
-static int do_tls_getsockopt_tx_zc(struct sock *sk, char __user *optval,
-				   int __user *optlen)
+static int do_tls_getsockopt_tx_zc(struct sock *sk, sockopt_t *opt)
 {
 	struct tls_context *ctx = tls_get_ctx(sk);
 	unsigned int value;
-	int len;
-
-	if (get_user(len, optlen))
-		return -EFAULT;
+	int len = opt->optlen;
 
 	if (len != sizeof(value))
 		return -EINVAL;
 
 	value = ctx->zerocopy_sendfile;
-	if (copy_to_user(optval, &value, sizeof(value)))
+	if (copy_to_iter(&value, sizeof(value), &opt->iter_out) != sizeof(value))
 		return -EFAULT;
 
 	return 0;
 }
 
-static int do_tls_getsockopt_no_pad(struct sock *sk, char __user *optval,
-				    int __user *optlen)
+static int do_tls_getsockopt_no_pad(struct sock *sk, sockopt_t *opt)
 {
 	struct tls_context *ctx = tls_get_ctx(sk);
-	int value, len;
+	int value, len = opt->optlen;
 
 	if (ctx->prot_info.version != TLS_1_3_VERSION)
 		return -EINVAL;
 
-	if (get_user(len, optlen))
-		return -EFAULT;
 	if (len < sizeof(value))
 		return -EINVAL;
 
@@ -525,38 +516,31 @@ static int do_tls_getsockopt_no_pad(struct sock *sk, char __user *optval,
 	if (value < 0)
 		return value;
 
-	if (put_user(sizeof(value), optlen))
-		return -EFAULT;
-	if (copy_to_user(optval, &value, sizeof(value)))
+	opt->optlen = sizeof(value);
+	if (copy_to_iter(&value, sizeof(value), &opt->iter_out) != sizeof(value))
 		return -EFAULT;
 
 	return 0;
 }
 
-static int do_tls_getsockopt_tx_payload_len(struct sock *sk, char __user *optval,
-					    int __user *optlen)
+static int do_tls_getsockopt_tx_payload_len(struct sock *sk, sockopt_t *opt)
 {
 	struct tls_context *ctx = tls_get_ctx(sk);
 	u16 payload_len = ctx->tx_max_payload_len;
-	int len;
-
-	if (get_user(len, optlen))
-		return -EFAULT;
+	int len = opt->optlen;
 
 	if (len < sizeof(payload_len))
 		return -EINVAL;
 
-	if (put_user(sizeof(payload_len), optlen))
-		return -EFAULT;
-
-	if (copy_to_user(optval, &payload_len, sizeof(payload_len)))
+	opt->optlen = sizeof(payload_len);
+	if (copy_to_iter(&payload_len, sizeof(payload_len),
+			 &opt->iter_out) != sizeof(payload_len))
 		return -EFAULT;
 
 	return 0;
 }
 
-static int do_tls_getsockopt(struct sock *sk, int optname,
-			     char __user *optval, int __user *optlen)
+static int do_tls_getsockopt(struct sock *sk, int optname, sockopt_t *opt)
 {
 	int rc = 0;
 
@@ -565,17 +549,16 @@ static int do_tls_getsockopt(struct sock *sk, int optname,
 	switch (optname) {
 	case TLS_TX:
 	case TLS_RX:
-		rc = do_tls_getsockopt_conf(sk, optval, optlen,
-					    optname == TLS_TX);
+		rc = do_tls_getsockopt_conf(sk, opt, optname == TLS_TX);
 		break;
 	case TLS_TX_ZEROCOPY_RO:
-		rc = do_tls_getsockopt_tx_zc(sk, optval, optlen);
+		rc = do_tls_getsockopt_tx_zc(sk, opt);
 		break;
 	case TLS_RX_EXPECT_NO_PAD:
-		rc = do_tls_getsockopt_no_pad(sk, optval, optlen);
+		rc = do_tls_getsockopt_no_pad(sk, opt);
 		break;
 	case TLS_TX_MAX_PAYLOAD_LEN:
-		rc = do_tls_getsockopt_tx_payload_len(sk, optval, optlen);
+		rc = do_tls_getsockopt_tx_payload_len(sk, opt);
 		break;
 	default:
 		rc = -ENOPROTOOPT;
@@ -591,12 +574,25 @@ static int tls_getsockopt(struct sock *sk, int level, int optname,
 			  char __user *optval, int __user *optlen)
 {
 	struct tls_context *ctx = tls_get_ctx(sk);
+	sockopt_t opt;
+	int err;
 
 	if (level != SOL_TLS)
 		return ctx->sk_proto->getsockopt(sk, level,
 						 optname, optval, optlen);
 
-	return do_tls_getsockopt(sk, optname, optval, optlen);
+	err = sockopt_init_user(&opt, optval, optlen);
+	if (err)
+		return err;
+
+	err = do_tls_getsockopt(sk, optname, &opt);
+	if (err)
+		return err;
+
+	if (put_user(opt.optlen, optlen))
+		return -EFAULT;
+
+	return 0;
 }
 
 static int validate_crypto_info(const struct tls_crypto_info *crypto_info,
diff --git a/tools/testing/selftests/net/getsockopt_iter.c b/tools/testing/selftests/net/getsockopt_iter.c
index fe5a5268bc34ec..974065a23fa825 100644
--- a/tools/testing/selftests/net/getsockopt_iter.c
+++ b/tools/testing/selftests/net/getsockopt_iter.c
@@ -28,7 +28,10 @@
 #include <linux/vm_sockets.h>
 #include <linux/icmp.h>
 #include <netinet/in.h>
+#include <netinet/tcp.h>
+#include <arpa/inet.h>
 #include <sys/socket.h>
+#include <linux/tls.h>
 #include "kselftest_harness.h"
 
 #ifndef AF_VSOCK
@@ -40,6 +43,45 @@
 #ifndef ICMP_FILTER
 #define ICMP_FILTER 1
 #endif
+#ifndef IPV6_HDRINCL
+#define IPV6_HDRINCL 36
+#endif
+#ifndef IPV6_CHECKSUM
+#define IPV6_CHECKSUM 7
+#endif
+#ifndef AF_IEEE802154
+#define AF_IEEE802154 36
+#endif
+#ifndef SOL_IEEE802154
+#define SOL_IEEE802154 0
+#endif
+#ifndef WPAN_WANTACK
+#define WPAN_WANTACK 0
+#endif
+#ifndef AF_PHONET
+#define AF_PHONET 35
+#endif
+#ifndef SOL_PNPIPE
+#define SOL_PNPIPE 275
+#endif
+#ifndef PN_PROTO_PIPE
+#define PN_PROTO_PIPE 2
+#endif
+#ifndef PNPIPE_ENCAP
+#define PNPIPE_ENCAP 1
+#endif
+#ifndef PNPIPE_ENCAP_NONE
+#define PNPIPE_ENCAP_NONE 0
+#endif
+#ifndef PNPIPE_ENCAP_IP
+#define PNPIPE_ENCAP_IP 1
+#endif
+#ifndef SOL_TLS
+#define SOL_TLS 282
+#endif
+#ifndef TCP_ULP
+#define TCP_ULP 31
+#endif
 
 /* ---------- netlink ---------- */
 
@@ -394,4 +436,386 @@ TEST_F(raw, bad_optname)
 	ASSERT_EQ(sizeof(val), optlen);
 }
 
+/* ---------- raw (ipv6) ---------- */
+
+FIXTURE(rawv6)
+{
+	int fd;
+};
+
+FIXTURE_SETUP(rawv6)
+{
+	self->fd = socket(AF_INET6, SOCK_RAW, IPPROTO_UDP);
+	if (self->fd < 0)
+		SKIP(return, "SOCK_RAW/IPv6 socket: %s", strerror(errno));
+}
+
+FIXTURE_TEARDOWN(rawv6)
+{
+	if (self->fd >= 0)
+		close(self->fd);
+}
+
+TEST_F(rawv6, hdrincl_exact)
+{
+	socklen_t optlen;
+	int val = -1;
+
+	optlen = sizeof(val);
+
+	ASSERT_EQ(0, getsockopt(self->fd, IPPROTO_IPV6, IPV6_HDRINCL,
+				&val, &optlen));
+	ASSERT_EQ(sizeof(int), optlen);
+	ASSERT_TRUE(val == 0 || val == 1);
+}
+
+TEST_F(rawv6, hdrincl_oversize_clamped)
+{
+	char buf[16] = {};
+	socklen_t optlen = sizeof(buf);
+
+	ASSERT_EQ(0, getsockopt(self->fd, IPPROTO_IPV6, IPV6_HDRINCL,
+				buf, &optlen));
+	ASSERT_EQ(sizeof(int), optlen);
+}
+
+/* Raw int options clamp the reported length down to the user buffer
+ * instead of returning EINVAL on a short buffer.
+ */
+TEST_F(rawv6, hdrincl_undersize_clamped)
+{
+	socklen_t optlen = 2;
+	int val = 0;
+
+	ASSERT_EQ(0, getsockopt(self->fd, IPPROTO_IPV6, IPV6_HDRINCL,
+				&val, &optlen));
+	ASSERT_EQ(2, optlen);
+}
+
+TEST_F(rawv6, checksum_default)
+{
+	socklen_t optlen;
+	int val = 0;
+
+	optlen = sizeof(val);
+
+	/* A non-ICMPv6 raw socket has the checksum disabled, reported as -1. */
+	ASSERT_EQ(0, getsockopt(self->fd, IPPROTO_IPV6, IPV6_CHECKSUM,
+				&val, &optlen));
+	ASSERT_EQ(sizeof(int), optlen);
+	ASSERT_EQ(-1, val);
+}
+
+TEST_F(rawv6, bad_optname)
+{
+	socklen_t optlen;
+	int val;
+
+	optlen = sizeof(val);
+
+	/* SOL_RAW reaches do_rawv6_getsockopt() directly. */
+	ASSERT_EQ(-1, getsockopt(self->fd, SOL_RAW, 0x7fff, &val, &optlen));
+	ASSERT_EQ(ENOPROTOOPT, errno);
+	ASSERT_EQ(sizeof(val), optlen);
+}
+
+/* ---------- ieee802154 (dgram) ---------- */
+
+FIXTURE(ieee802154)
+{
+	int fd;
+};
+
+FIXTURE_SETUP(ieee802154)
+{
+	self->fd = socket(AF_IEEE802154, SOCK_DGRAM, 0);
+	if (self->fd < 0)
+		SKIP(return, "AF_IEEE802154 dgram socket: %s", strerror(errno));
+}
+
+FIXTURE_TEARDOWN(ieee802154)
+{
+	if (self->fd >= 0)
+		close(self->fd);
+}
+
+TEST_F(ieee802154, wantack_exact)
+{
+	socklen_t optlen;
+	int val = -1;
+
+	optlen = sizeof(val);
+
+	ASSERT_EQ(0, getsockopt(self->fd, SOL_IEEE802154, WPAN_WANTACK,
+				&val, &optlen));
+	ASSERT_EQ(sizeof(int), optlen);
+	ASSERT_TRUE(val == 0 || val == 1);
+}
+
+TEST_F(ieee802154, wantack_oversize_clamped)
+{
+	char buf[16] = {};
+	socklen_t optlen = sizeof(buf);
+
+	ASSERT_EQ(0, getsockopt(self->fd, SOL_IEEE802154, WPAN_WANTACK,
+				buf, &optlen));
+	ASSERT_EQ(sizeof(int), optlen);
+}
+
+TEST_F(ieee802154, wantack_undersize_clamped)
+{
+	socklen_t optlen = 2;
+	int val = 0;
+
+	ASSERT_EQ(0, getsockopt(self->fd, SOL_IEEE802154, WPAN_WANTACK,
+				&val, &optlen));
+	ASSERT_EQ(2, optlen);
+}
+
+TEST_F(ieee802154, bad_optname)
+{
+	socklen_t optlen;
+	int val;
+
+	optlen = sizeof(val);
+
+	ASSERT_EQ(-1, getsockopt(self->fd, SOL_IEEE802154, 0x7fff,
+				 &val, &optlen));
+	ASSERT_EQ(ENOPROTOOPT, errno);
+	ASSERT_EQ(sizeof(val), optlen);
+}
+
+/* dgram_getsockopt() rejects any level other than SOL_IEEE802154. */
+TEST_F(ieee802154, bad_level)
+{
+	socklen_t optlen;
+	int val;
+
+	optlen = sizeof(val);
+
+	ASSERT_EQ(-1, getsockopt(self->fd, SOL_RAW, WPAN_WANTACK,
+				 &val, &optlen));
+	ASSERT_EQ(EOPNOTSUPP, errno);
+	ASSERT_EQ(sizeof(val), optlen);
+}
+
+/* ---------- phonet (pep) ---------- */
+
+FIXTURE(phonet)
+{
+	int fd;
+};
+
+FIXTURE_SETUP(phonet)
+{
+	self->fd = socket(AF_PHONET, SOCK_SEQPACKET, PN_PROTO_PIPE);
+	if (self->fd < 0)
+		SKIP(return, "AF_PHONET pipe socket: %s", strerror(errno));
+}
+
+FIXTURE_TEARDOWN(phonet)
+{
+	if (self->fd >= 0)
+		close(self->fd);
+}
+
+TEST_F(phonet, encap_exact)
+{
+	socklen_t optlen;
+	int val = -1;
+
+	optlen = sizeof(val);
+
+	ASSERT_EQ(0, getsockopt(self->fd, SOL_PNPIPE, PNPIPE_ENCAP,
+				&val, &optlen));
+	ASSERT_EQ(sizeof(int), optlen);
+	ASSERT_TRUE(val == PNPIPE_ENCAP_NONE || val == PNPIPE_ENCAP_IP);
+}
+
+TEST_F(phonet, encap_oversize_clamped)
+{
+	char buf[16] = {};
+	socklen_t optlen = sizeof(buf);
+
+	ASSERT_EQ(0, getsockopt(self->fd, SOL_PNPIPE, PNPIPE_ENCAP,
+				buf, &optlen));
+	ASSERT_EQ(sizeof(int), optlen);
+}
+
+/* pep clamps the reported length down to the user buffer. Use an
+ * int-sized backing buffer with a short optlen so the baseline kernel,
+ * which writes a full int via put_user(), does not scribble past it.
+ */
+TEST_F(phonet, encap_undersize_clamped)
+{
+	socklen_t optlen = 2;
+	int val = 0;
+
+	ASSERT_EQ(0, getsockopt(self->fd, SOL_PNPIPE, PNPIPE_ENCAP,
+				&val, &optlen));
+	ASSERT_EQ(2, optlen);
+}
+
+TEST_F(phonet, bad_optname)
+{
+	socklen_t optlen;
+	int val;
+
+	optlen = sizeof(val);
+
+	ASSERT_EQ(-1, getsockopt(self->fd, SOL_PNPIPE, 0x7fff, &val, &optlen));
+	ASSERT_EQ(ENOPROTOOPT, errno);
+	ASSERT_EQ(sizeof(val), optlen);
+}
+
+/* pep_getsockopt() rejects any level other than SOL_PNPIPE. */
+TEST_F(phonet, bad_level)
+{
+	socklen_t optlen;
+	int val;
+
+	optlen = sizeof(val);
+
+	ASSERT_EQ(-1, getsockopt(self->fd, SOL_RAW, PNPIPE_ENCAP, &val, &optlen));
+	ASSERT_EQ(ENOPROTOOPT, errno);
+	ASSERT_EQ(sizeof(val), optlen);
+}
+
+/* ---------- tls ---------- */
+
+FIXTURE(tls)
+{
+	int fd;
+	int sfd;
+};
+
+FIXTURE_SETUP(tls)
+{
+	struct sockaddr_in a = {
+		.sin_family = AF_INET,
+		.sin_addr.s_addr = htonl(INADDR_LOOPBACK),
+	};
+	socklen_t alen = sizeof(a);
+	int lfd;
+
+	self->fd = -1;
+	self->sfd = -1;
+
+	lfd = socket(AF_INET, SOCK_STREAM, 0);
+	if (lfd < 0)
+		SKIP(return, "TCP socket: %s", strerror(errno));
+	if (bind(lfd, (struct sockaddr *)&a, sizeof(a)) || listen(lfd, 1) ||
+	    getsockname(lfd, (struct sockaddr *)&a, &alen)) {
+		close(lfd);
+		SKIP(return, "listener setup: %s", strerror(errno));
+	}
+	self->fd = socket(AF_INET, SOCK_STREAM, 0);
+	if (connect(self->fd, (struct sockaddr *)&a, sizeof(a))) {
+		close(lfd);
+		SKIP(return, "connect: %s", strerror(errno));
+	}
+	self->sfd = accept(lfd, NULL, NULL);
+	close(lfd);
+	if (setsockopt(self->fd, IPPROTO_TCP, TCP_ULP, "tls", sizeof("tls")))
+		SKIP(return, "TCP_ULP=tls: %s (built without TLS?)",
+		     strerror(errno));
+}
+
+FIXTURE_TEARDOWN(tls)
+{
+	if (self->fd >= 0)
+		close(self->fd);
+	if (self->sfd >= 0)
+		close(self->sfd);
+}
+
+/* do_tls_getsockopt_tx_zc(): fixed-size int, exact length required. */
+TEST_F(tls, tx_zerocopy_exact)
+{
+	socklen_t optlen = sizeof(int);
+	int val = -1;
+
+	ASSERT_EQ(0, getsockopt(self->fd, SOL_TLS, TLS_TX_ZEROCOPY_RO,
+				&val, &optlen));
+	ASSERT_EQ(sizeof(int), optlen);
+	ASSERT_TRUE(val == 0 || val == 1);
+}
+
+TEST_F(tls, tx_zerocopy_wrong_len)
+{
+	socklen_t optlen = 2;
+	int val;
+
+	ASSERT_EQ(-1, getsockopt(self->fd, SOL_TLS, TLS_TX_ZEROCOPY_RO,
+				 &val, &optlen));
+	ASSERT_EQ(EINVAL, errno);
+}
+
+/* do_tls_getsockopt_conf(): NULL optval still yields EINVAL -- the
+ * converted code tests opt->iter_out.ubuf in place of optval.
+ */
+TEST_F(tls, conf_null_optval)
+{
+	socklen_t optlen = 64;
+
+	ASSERT_EQ(-1, getsockopt(self->fd, SOL_TLS, TLS_TX, NULL, &optlen));
+	ASSERT_EQ(EINVAL, errno);
+}
+
+TEST_F(tls, conf_short)
+{
+	socklen_t optlen = 2;
+	char buf[2];
+
+	ASSERT_EQ(-1, getsockopt(self->fd, SOL_TLS, TLS_TX, buf, &optlen));
+	ASSERT_EQ(EINVAL, errno);
+}
+
+/* TLS_TX before crypto is set reports not-ready. */
+TEST_F(tls, conf_not_ready)
+{
+	struct tls_crypto_info info;
+	socklen_t optlen = sizeof(info);
+
+	ASSERT_EQ(-1, getsockopt(self->fd, SOL_TLS, TLS_TX, &info, &optlen));
+	ASSERT_EQ(EBUSY, errno);
+}
+
+/* Set TX crypto, then read it back at the base and full sizes, exercising
+ * both copy_to_iter() branches. SKIP if AES-GCM is unavailable.
+ */
+TEST_F(tls, conf_crypto_roundtrip)
+{
+	struct tls12_crypto_info_aes_gcm_128 tx = {
+		.info.version = TLS_1_2_VERSION,
+		.info.cipher_type = TLS_CIPHER_AES_GCM_128,
+	};
+	struct tls12_crypto_info_aes_gcm_128 full;
+	struct tls_crypto_info base;
+	socklen_t optlen;
+
+	if (setsockopt(self->fd, SOL_TLS, TLS_TX, &tx, sizeof(tx)))
+		SKIP(return, "set TLS_TX aes_gcm_128: %s", strerror(errno));
+
+	optlen = sizeof(base);
+	ASSERT_EQ(0, getsockopt(self->fd, SOL_TLS, TLS_TX, &base, &optlen));
+	ASSERT_EQ(sizeof(base), optlen);
+	ASSERT_EQ(TLS_1_2_VERSION, base.version);
+	ASSERT_EQ(TLS_CIPHER_AES_GCM_128, base.cipher_type);
+
+	optlen = sizeof(full);
+	ASSERT_EQ(0, getsockopt(self->fd, SOL_TLS, TLS_TX, &full, &optlen));
+	ASSERT_EQ(sizeof(full), optlen);
+	ASSERT_EQ(TLS_CIPHER_AES_GCM_128, full.info.cipher_type);
+}
+
+TEST_F(tls, bad_optname)
+{
+	socklen_t optlen = sizeof(int);
+	int val;
+
+	ASSERT_EQ(-1, getsockopt(self->fd, SOL_TLS, 0x7fff, &val, &optlen));
+	ASSERT_EQ(ENOPROTOOPT, errno);
+}
+
 TEST_HARNESS_MAIN

gemini-3.1-pro-preview

null

null

							input: 11010
							output: 41
							thoughts: 451
						

**Analyzing a Kernel Patch: Getsockopt Refactoring**

Alright, let's break down this patch. My initial assessment is that it's a fairly significant change, specifically targeting how the kernel's `getsockopt` functions interact with user space. I see modifications across several network subsystems: `ieee802154`, `ipv6 raw`, `phonet`, and `tls`. The pattern is consistent: the patch appears to be refactoring the signatures of the `getsockopt` implementations. Instead of directly dealing with `char __user *optval` and `int __user *optlen`, it's switching to a `sockopt_t *opt` approach and employing functions like `sockopt_init_user` and `copy_to_iter`. This strongly suggests a move towards a unified framework for socket options, likely for a variety of reasons. I'm speculating BPF integration, io_uring optimization, or potentially just a general cleanup of this interface.

Because it modifies core networking functionality (how data is copied out of the kernel with `getsockopt`), this is obviously a functional change. That means it's critical to understand the implications of this change and determine the scope of this refactor.

Now, I need to verify which configurations enable these subsystems. It looks like:

*   `net/ieee802154/socket.c` requires both `CONFIG_IEEE802154` and `CONFIG_IEEE802154_SOCKET`
*   `net/ipv6/raw.c` is governed by `CONFIG_IPV6`
*   `net/phonet/pep.c` relies on `CONFIG_PHONET`
*   `net/tls/tls_main.c` is enabled by `CONFIG_TLS`

I'll need to double-check those config names to be absolutely sure. This will help me quickly understand the potential reach of this patch.

{
  "Expression": "config IEEE802154",
  "PathPrefix": "net/ieee802154/Kconfig"
}

{
  "Output": "net/ieee802154/Kconfig-1-# SPDX-License-Identifier: GPL-2.0-only\nnet/ieee802154/Kconfig:2:menuconfig IEEE802154\nnet/ieee802154/Kconfig-3-\ttristate \"IEEE Std 802.15.4 Low-Rate Wireless Personal Area Networks support\"\n--\nnet/ieee802154/Kconfig=14=if IEEE802154\nnet/ieee802154/Kconfig-15-\nnet/ieee802154/Kconfig:16:config IEEE802154_NL802154_EXPERIMENTAL\nnet/ieee802154/Kconfig-17-\tbool \"IEEE 802.15.4 experimental netlink support\"\n--\nnet/ieee802154/Kconfig-20-\nnet/ieee802154/Kconfig:21:config IEEE802154_SOCKET\nnet/ieee802154/Kconfig-22-\ttristate \"IEEE 802.15.4 socket interface\"\n"
}

gemini-3.1-pro-preview

null

null

							input: 12234
							output: 31
							thoughts: 22
						

Okay, here's my interpretation of those thoughts, framed as an expert's internal monologue:

**IEEE 802.15.4 Context and Socket Abstraction**

Alright, let's see. My mind immediately jumps to `IEEE802154` and `IEEE802154_SOCKET`. That's a strong indication of considering a Low-Rate Wireless Personal Area Network (LR-WPAN) implementation. I'm likely dealing with code or a system that's built on top of or designed to interface with the IEEE 802.15.4 standard. The standard itself defines the physical and MAC layers, so I'm likely concerned with how a particular device or system is interacting with the underlying RF protocol.

The presence of `_SOCKET` suggests we are probably dealing with an abstraction layer. Specifically, I imagine a software interface that allows applications to interact with the 802.15.4 radio in a more convenient, application-friendly way, similar to how standard TCP/IP sockets work for Ethernet or the Internet. This socket abstraction should abstract the low-level details of frame formatting, addressing, and acknowledge handling, offering a simpler programming model. We might be using a framework like Contiki, TinyOS, or something custom.

Therefore, the main goal is to efficiently handle data transfer and communication over a low-power, short-range wireless network. The specifics will vary depending on the implementation.

{
  "Expression": "config PHONET",
  "PathPrefix": "net/phonet/Kconfig"
}

{
  "Output": "net/phonet/Kconfig-5-\nnet/phonet/Kconfig:6:config PHONET\nnet/phonet/Kconfig-7-\ttristate \"Phonet protocols family\"\n"
}

gemini-3.1-pro-preview

null

null

							input: 12654
							output: 28
							thoughts: 6
						

Okay, here's my attempt at summarizing the thought process, tailored for an expert audience, and written in the first person:

**PHONET and the Nuances of Linguistic Structure**

Right, so "PHONET." That's the starting point. Immediately, my mind jumps into the challenges and complexities. We're looking at a phonological network, but the critical question is *how* the relationships are encoded. Are we dealing with feature-based representations, or something more abstract? Is it a strict, rule-governed system, or does it incorporate some degree of probabilistic weighting, reflecting the gradient nature of phonetic realization?

The term brings up a host of sub-questions: what's the level of abstraction? Is this a purely theoretical construct, or are we dealing with a model grounded in empirical data, like acoustic measurements or articulatory data? Is the goal descriptive, attempting to capture the observed patterns, or generative, aiming to predict novel sound patterns and variations? We have to look at the methods employed: Is this a hand-crafted system, or something that has been automatically learned? What are the data sets the network is based on?

I also want to know how the network handles variations. Is it designed to accommodate dialectal differences and the inherent variability of speech production? How well does it explain phenomena like allophony, assimilation, and neutralization? Does it consider the prosodic structure?

The implications are fascinating. We're talking about connecting phonology with phonetics. We have to consider how perception and production inform these networks.
We must look at implementation. What kind of algorithm underpins it? What are the constraints, and what are the limitations?

In the end, what insights can this structure offer? Does it challenge existing phonological theory, or does it provide a new way of formalizing our understanding? Is the model generalizable across languages? I can't wait to see how the "PHONET" system addresses these crucial questions.

{
  "Expression": "config TLS",
  "PathPrefix": "net/tls/Kconfig"
}

{
  "Output": "net/tls/Kconfig-4-#\nnet/tls/Kconfig:5:config TLS\nnet/tls/Kconfig-6-\ttristate \"Transport Layer Security support\"\n--\nnet/tls/Kconfig-18-\nnet/tls/Kconfig:19:config TLS_DEVICE\nnet/tls/Kconfig-20-\tbool \"Transport Layer Security HW offload\"\n"
}

gemini-3.1-pro-preview

null

null

							input: 13200
							output: 40
							thoughts: 251
						

**Analyzing Socket Option Implementations**

Okay, so we're looking at socket option implementations, specifically in the context of `TLS`. `IPv6` is usually on, but we can definitely incorporate it.

My primary focus is on these functions: `dgram_getsockopt` within `net/ieee802154/socket.c`, `rawv6_getsockopt` from `net/ipv6/raw.c`, `pep_getsockopt` in `net/phonet/pep.c`, and finally, `tls_getsockopt` located in `net/tls/tls_main.c`.

Let's start by verifying the visibility of `dgram_getsockopt`. Is it exported or static? Ah, the patch indicates it's `static`. Hold on, the prompt advises us to favor non-static, non-inlined API entrypoints over internal static helper functions. Those static ones get inlined by the compiler, meaning they lack distinct symbol addresses. Interesting... now, where is `dgram_getsockopt` being *used*? That's the next logical step.

{
  "Expression": "dgram_getsockopt",
  "PathPrefix": "net/ieee802154/socket.c"
}

{
  "Output": "net/ieee802154/socket.c=793=static int ieee802154_dgram_deliver(struct net_device *dev, struct sk_buff *skb)\n--\nnet/ieee802154/socket.c-833-\nnet/ieee802154/socket.c:834:static int do_dgram_getsockopt(struct sock *sk, int optname, sockopt_t *opt)\nnet/ieee802154/socket.c-835-{\n--\nnet/ieee802154/socket.c-871-\nnet/ieee802154/socket.c:872:static int dgram_getsockopt(struct sock *sk, int level, int optname,\nnet/ieee802154/socket.c-873-\t\t\t    char __user *optval, int __user *optlen)\n--\nnet/ieee802154/socket.c-884-\nnet/ieee802154/socket.c:885:\terr = do_dgram_getsockopt(sk, optname, \u0026opt);\nnet/ieee802154/socket.c-886-\tif (err)\n--\nnet/ieee802154/socket.c=968=static struct proto ieee802154_dgram_prot = {\n--\nnet/ieee802154/socket.c-981-\t.ioctl\t\t= dgram_ioctl,\nnet/ieee802154/socket.c:982:\t.getsockopt\t= dgram_getsockopt,\nnet/ieee802154/socket.c-983-\t.setsockopt\t= dgram_setsockopt,\n"
}

gemini-3.1-pro-preview

null

null

							input: 14215
							output: 35
							thoughts: 172
						

**Analyzing the getsockopt Function Call Flow**

Okay, so I'm looking at how `getsockopt` is handled, specifically within the context of `ieee802154_dgram_prot`. I see that the function is assigned to `.getsockopt`, which is good. The key question is whether there's a non-static function involved that would be better to focus on. Nope, `dgram_getsockopt` *is* the entry point for this specific protocol, which is important to remember. It's static, yes, but its address is being taken, which means the compiler won't try to inline it, so I can safely focus my efforts there.

Ah, right, `ieee802154_dgram_prot` is a `struct proto`. This means the *actual* syscall entry point is a chain of calls: `sys_getsockopt` -> `sock_common_getsockopt` -> `sk->sk_prot->getsockopt`. Therefore, I'm confident that digging into `dgram_getsockopt` is the right move, since it's the specific implementation for this protocol and, as confirmed, won't be inlined. That's a solid understanding.

Now, let's switch gears and see what `rawv6_getsockopt` is doing in comparison.

{
  "Expression": "rawv6_getsockopt",
  "PathPrefix": "net/ipv6/raw.c"
}

{
  "Output": "net/ipv6/raw.c=1031=static int rawv6_setsockopt(struct sock *sk, int level, int optname,\n--\nnet/ipv6/raw.c-1053-\nnet/ipv6/raw.c:1054:static int do_rawv6_getsockopt(struct sock *sk, int optname, sockopt_t *opt)\nnet/ipv6/raw.c-1055-{\n--\nnet/ipv6/raw.c-1088-\nnet/ipv6/raw.c:1089:static int rawv6_getsockopt(struct sock *sk, int level, int optname,\nnet/ipv6/raw.c-1090-\t\t\t  char __user *optval, int __user *optlen)\n--\nnet/ipv6/raw.c-1115-\nnet/ipv6/raw.c:1116:\terr = do_rawv6_getsockopt(sk, optname, \u0026opt);\nnet/ipv6/raw.c-1117-\tif (err)\n--\nnet/ipv6/raw.c=1207=struct proto rawv6_prot = {\n--\nnet/ipv6/raw.c-1216-\t.setsockopt\t   = rawv6_setsockopt,\nnet/ipv6/raw.c:1217:\t.getsockopt\t   = rawv6_getsockopt,\nnet/ipv6/raw.c-1218-\t.sendmsg\t   = rawv6_sendmsg,\n"
}

gemini-3.1-pro-preview

null

null

							input: 15119
							output: 35
							thoughts: 28
						

Here's my summary, as the thought process unfolds:

**Digging into Socket Options**

Okay, so `rawv6_getsockopt` is defined as `static`, which is unusual, but I know it's being used because someone, somewhere, is taking its address. That's immediately raising a red flag. Why is a static function getting addressed? This almost certainly means it's being accessed outside of its intended scope, probably through some function pointer trickery or possibly some sort of library injection. I need to understand *how* it's being used.

Alright, let's pivot to investigating `pep_getsockopt`. Given the nature of networking functions, it's reasonable to suspect that the problem is either with the calling code, or the code is intended to be called. I'll need to see how the latter works, so I'll need to check the former as well. Let's see if this sheds any light on the situation. I'm expecting some kind of delegation or forwarding here, or maybe even a direct call if we're *really* lucky, which would show the context. I'll need to find the definition of `pep_getsockopt` to confirm my suspicions and to look for clues about the relationship between `rawv6_getsockopt` and other parts of the system.

{
  "Expression": "pep_getsockopt",
  "PathPrefix": "net/phonet/pep.c"
}

{
  "Output": "net/phonet/pep.c=1019=static int pep_setsockopt(struct sock *sk, int level, int optname,\n--\nnet/phonet/pep.c-1080-\nnet/phonet/pep.c:1081:static int do_pep_getsockopt(struct sock *sk, int optname, sockopt_t *opt)\nnet/phonet/pep.c-1082-{\n--\nnet/phonet/pep.c-1115-\nnet/phonet/pep.c:1116:static int pep_getsockopt(struct sock *sk, int level, int optname,\nnet/phonet/pep.c-1117-\t\t\t  char __user *optval, int __user *optlen)\n--\nnet/phonet/pep.c-1128-\nnet/phonet/pep.c:1129:\terr = do_pep_getsockopt(sk, optname, \u0026opt);\nnet/phonet/pep.c-1130-\tif (err)\n--\nnet/phonet/pep.c=1380=static struct proto pep_proto = {\n--\nnet/phonet/pep.c-1386-\t.setsockopt\t= pep_setsockopt,\nnet/phonet/pep.c:1387:\t.getsockopt\t= pep_getsockopt,\nnet/phonet/pep.c-1388-\t.sendmsg\t= pep_sendmsg,\n"
}

gemini-3.1-pro-preview

null

null

							input: 15867
							output: 34
							thoughts: 26
						

Here's my thought process, as requested:

**Digging into Socket Options**

Okay, so `pep_getsockopt` is declared as `static`, which is interesting, but I see that its address is being taken. That's a classic code smell, usually meaning it's being used outside of the compilation unit it's supposed to be restricted to. Let me quickly pivot. Let's see if something similar is happening with `tls_getsockopt`. Perhaps this is a more widespread issue with the socket option handling, and I can quickly ascertain a pattern. I need to be methodical here. Let's see how `tls_getsockopt` is being used.

{
  "Expression": "tls_getsockopt",
  "PathPrefix": "net/tls/tls_main.c"
}

{
  "Output": "net/tls/tls_main.c=399=static __poll_t tls_sk_poll(struct file *file, struct socket *sock,\n--\nnet/tls/tls_main.c-426-\nnet/tls/tls_main.c:427:static int do_tls_getsockopt_conf(struct sock *sk, sockopt_t *opt, int tx)\nnet/tls/tls_main.c-428-{\n--\nnet/tls/tls_main.c-485-\nnet/tls/tls_main.c:486:static int do_tls_getsockopt_tx_zc(struct sock *sk, sockopt_t *opt)\nnet/tls/tls_main.c-487-{\n--\nnet/tls/tls_main.c-501-\nnet/tls/tls_main.c:502:static int do_tls_getsockopt_no_pad(struct sock *sk, sockopt_t *opt)\nnet/tls/tls_main.c-503-{\n--\nnet/tls/tls_main.c-525-\nnet/tls/tls_main.c:526:static int do_tls_getsockopt_tx_payload_len(struct sock *sk, sockopt_t *opt)\nnet/tls/tls_main.c-527-{\n--\nnet/tls/tls_main.c-542-\nnet/tls/tls_main.c:543:static int do_tls_getsockopt(struct sock *sk, int optname, sockopt_t *opt)\nnet/tls/tls_main.c-544-{\n--\nnet/tls/tls_main.c-551-\tcase TLS_RX:\nnet/tls/tls_main.c:552:\t\trc = do_tls_getsockopt_conf(sk, opt, optname == TLS_TX);\nnet/tls/tls_main.c-553-\t\tbreak;\nnet/tls/tls_main.c-554-\tcase TLS_TX_ZEROCOPY_RO:\nnet/tls/tls_main.c:555:\t\trc = do_tls_getsockopt_tx_zc(sk, opt);\nnet/tls/tls_main.c-556-\t\tbreak;\nnet/tls/tls_main.c-557-\tcase TLS_RX_EXPECT_NO_PAD:\nnet/tls/tls_main.c:558:\t\trc = do_tls_getsockopt_no_pad(sk, opt);\nnet/tls/tls_main.c-559-\t\tbreak;\nnet/tls/tls_main.c-560-\tcase TLS_TX_MAX_PAYLOAD_LEN:\nnet/tls/tls_main.c:561:\t\trc = do_tls_getsockopt_tx_payload_len(sk, opt);\nnet/tls/tls_main.c-562-\t\tbreak;\n--\nnet/tls/tls_main.c-572-\nnet/tls/tls_main.c:573:static int tls_getsockopt(struct sock *sk, int level, int optname,\nnet/tls/tls_main.c-574-\t\t\t  char __user *optval, int __user *optlen)\n--\nnet/tls/tls_main.c-587-\nnet/tls/tls_main.c:588:\terr = do_tls_getsockopt(sk, optname, \u0026opt);\nnet/tls/tls_main.c-589-\tif (err)\n--\nnet/tls/tls_main.c=998=static void build_protos(struct proto prot[TLS_NUM_CONFIG][TLS_NUM_CONFIG],\n--\nnet/tls/tls_main.c-1002-\tprot[TLS_BASE][TLS_BASE].setsockopt\t= tls_setsockopt;\nnet/tls/tls_main.c:1003:\tprot[TLS_BASE][TLS_BASE].getsockopt\t= tls_getsockopt;\nnet/tls/tls_main.c-1004-\tprot[TLS_BASE][TLS_BASE].disconnect\t= tls_disconnect;\n"
}

gemini-3.1-pro-preview

null

null

							input: 17113
							output: 35
							thoughts: 328
						

**Analyzing Socket Option Configurations**

Okay, so `tls_getsockopt` is statically defined but its address is being taken, which is interesting. My focus needs to be on these functions: `dgram_getsockopt`, `rawv6_getsockopt`, `pep_getsockopt`, and, of course, `tls_getsockopt`.

Now, let's nail down the configuration dependencies. For `rawv6_getsockopt`, it's straightforward: we need `CONFIG_IPV6`. For `dgram_getsockopt`, we'll need `CONFIG_IEEE802154` and `CONFIG_IEEE802154_SOCKET`. `pep_getsockopt` requires `CONFIG_PHONET`. And for `tls_getsockopt`, we need `CONFIG_TLS`.

I'll quickly double-check the `Kconfig` for `IEEE802154_SOCKET`. Yep, as expected, it depends on `IEEE802154`. Good. I'll also double-check the `Kconfig` files for `PHONET` and `TLS`, and they are just `PHONET` and `TLS`, respectively.

Now I need to re-verify the dependency on `IPV6`. Yep, we're still good there.

I wonder if there are any other subtle dependencies lurking? Let me double-check the `net/ieee802154/Kconfig` file again...Ah, no, it looks like `MAC802154` depends on `IEEE802154`, but not the other way around. Okay, that seems to be it.

no matches

{
  "Expression": "depends on",
  "PathPrefix": "net/ieee802154/Kconfig"
}

{
  "error": "no matches"
}

gemini-3.1-pro-preview

null

null

							input: 17857
							output: 39
							thoughts: 30
						

Here's my take on those thoughts:

**Analyzing the Kconfig Dependency Landscape**

Okay, hold on a second. I was expecting to see some dependencies defined in `net/ieee802154/Kconfig`, right? I mean, everything *should* have some level of conditional inclusion based on features or hardware… But there's *nothing* there? No `depends on` clauses? That's a little unusual, I'll admit, and a potential indicator of something worth investigating. Alright, let's just go ahead and read this file and see what's actually going on. This is likely to tell me whether this module is designed to be universally available or whether something deeper has gone awry. I bet this is interesting.

{
  "File": "net/ieee802154/Kconfig",
  "FirstLine": 1,
  "LineCount": 30
}

{
  "Contents": "   1:\t# SPDX-License-Identifier: GPL-2.0-only\n   2:\tmenuconfig IEEE802154\n   3:\t\ttristate \"IEEE Std 802.15.4 Low-Rate Wireless Personal Area Networks support\"\n   4:\t\thelp\n   5:\t\t  IEEE Std 802.15.4 defines a low data rate, low power and low\n   6:\t\t  complexity short range wireless personal area networks. It was\n   7:\t\t  designed to organise networks of sensors, switches, etc automation\n   8:\t\t  devices. Maximum allowed data rate is 250 kb/s and typical personal\n   9:\t\t  operating space around 10m.\n  10:\t\n  11:\t\t  Say Y here to compile LR-WPAN support into the kernel or say M to\n  12:\t\t  compile it as modules.\n  13:\t\n  14:\tif IEEE802154\n  15:\t\n  16:\tconfig IEEE802154_NL802154_EXPERIMENTAL\n  17:\t\tbool \"IEEE 802.15.4 experimental netlink support\"\n  18:\t\thelp\n  19:\t\t  Adds experimental netlink support for nl802154.\n  20:\t\n  21:\tconfig IEEE802154_SOCKET\n  22:\t\ttristate \"IEEE 802.15.4 socket interface\"\n  23:\t\tdefault y\n  24:\t\thelp\n  25:\t\t  Socket interface for IEEE 802.15.4. Contains DGRAM sockets interface\n  26:\t\t  for 802.15.4 dataframes. Also RAW socket interface to build MAC\n  27:\t\t  header from userspace.\n  28:\t\n  29:\tsource \"net/ieee802154/6lowpan/Kconfig\"\n  30:\t\n"
}

gemini-3.1-pro-preview

null

null

							input: 18570
							output: 33
							thoughts: 37
						

Okay, here we go.

**Navigating the Wireless Network Landscape**

Alright, I need to get my head around these network standards, specifically `IEEE802154` and its socket interface, `IEEE802154_SOCKET`. Where do these fit in the grand scheme of things? My first instinct is to see how this all configured. Time to dive into the kernel configuration, starting with `net/phonet/Kconfig`. Let's see what features are enabled and how this stack is defined.

{
  "File": "net/phonet/Kconfig",
  "FirstLine": 1,
  "LineCount": 30
}

{
  "Contents": "   1:\t# SPDX-License-Identifier: GPL-2.0-only\n   2:\t#\n   3:\t# Phonet protocol\n   4:\t#\n   5:\t\n   6:\tconfig PHONET\n   7:\t\ttristate \"Phonet protocols family\"\n   8:\t\thelp\n   9:\t\t  The Phone Network protocol (PhoNet) is a packet-oriented\n  10:\t\t  communication protocol developed by Nokia for use with its modems.\n  11:\t\n  12:\t\t  This is required for Maemo to use cellular data connectivity (if\n  13:\t\t  supported). It can also be used to control Nokia phones\n  14:\t\t  from a Linux computer, although AT commands may be easier to use.\n  15:\t\n  16:\t\t  To compile this driver as a module, choose M here: the module\n  17:\t\t  will be called phonet. If unsure, say N.\n"
}

gemini-3.1-pro-preview

null

null

							input: 18988
							output: 32
							thoughts: 20
						

Here's my thought process, as if I were considering those notes:

**Focusing in on Network Security Configuration**

Alright, the initial prompt seems to be hinting at something related to the network, and the term `PHONET` probably relates to some underlying structure I need to configure. The first logical step, given my experience, is to zero in on the core configuration files. `net/tls/Kconfig` is a really good place to start, as this likely defines the options and settings related to Transport Layer Security within the network subsystem. This is where the core configuration of network security starts.

{
  "File": "net/tls/Kconfig",
  "FirstLine": 1,
  "LineCount": 30
}

{
  "Contents": "   1:\t# SPDX-License-Identifier: GPL-2.0-only\n   2:\t#\n   3:\t# TLS configuration\n   4:\t#\n   5:\tconfig TLS\n   6:\t\ttristate \"Transport Layer Security support\"\n   7:\t\tdepends on INET\n   8:\t\tselect CRYPTO\n   9:\t\tselect CRYPTO_AES\n  10:\t\tselect CRYPTO_GCM\n  11:\t\tselect NET_SOCK_MSG\n  12:\t\tdefault n\n  13:\t\thelp\n  14:\t\tEnable kernel support for TLS protocol. This allows symmetric\n  15:\t\tencryption handling of the TLS protocol to be done in-kernel.\n  16:\t\n  17:\t\tIf unsure, say N.\n  18:\t\n  19:\tconfig TLS_DEVICE\n  20:\t\tbool \"Transport Layer Security HW offload\"\n  21:\t\tdepends on TLS\n  22:\t\tselect SKB_DECRYPTED\n  23:\t\tselect SOCK_VALIDATE_XMIT\n  24:\t\tselect SOCK_RX_QUEUE_MAPPING\n  25:\t\tdefault n\n  26:\t\thelp\n  27:\t\tEnable kernel support for HW offload of the TLS protocol.\n  28:\t\n  29:\t\tIf unsure, say N.\n"
}

gemini-3.1-pro-preview

null

null

							input: 19491
							output: 31
							thoughts: 19
						

Here's my attempt at summarizing the thought process, tailored for an expert audience:

**TLS Context Check**

Alright, straight to the point: `TLS`. I need to figure out the context, and quickly. My first instinct is to dive into the kernel configuration space. Specifically, `net/ipv6/Kconfig`. This seems like a reasonable starting point, as it's the section governing IPv6 networking, and TLS often deals with secure connections over the network stack. I'm expecting this config file to provide insight on relevant kernel options or dependencies related to `TLS`. Perhaps this module is connected to security options within the IPv6 stack. I need to understand if `TLS` support is conditional, and if so, what triggers it. Time to dig in and see what's what.

{
  "Expression": "config IPV6",
  "PathPrefix": "net/ipv6/Kconfig"
}

{
  "Output": "net/ipv6/Kconfig-5-\nnet/ipv6/Kconfig:6:menuconfig IPV6\nnet/ipv6/Kconfig-7-\tbool \"The IPv6 protocol\"\n--\nnet/ipv6/Kconfig=19=if IPV6\nnet/ipv6/Kconfig-20-\nnet/ipv6/Kconfig:21:config IPV6_ROUTER_PREF\nnet/ipv6/Kconfig-22-\tbool \"IPv6: Router Preference (RFC 4191) support\"\n--\nnet/ipv6/Kconfig-30-\nnet/ipv6/Kconfig:31:config IPV6_ROUTE_INFO\nnet/ipv6/Kconfig-32-\tbool \"IPv6: Route Information (RFC 4191) support\"\n--\nnet/ipv6/Kconfig-38-\nnet/ipv6/Kconfig:39:config IPV6_OPTIMISTIC_DAD\nnet/ipv6/Kconfig-40-\tbool \"IPv6: Enable RFC 4429 Optimistic DAD\"\n--\nnet/ipv6/Kconfig=102=config INET6_IPCOMP\n--\nnet/ipv6/Kconfig-111-\nnet/ipv6/Kconfig:112:config IPV6_MIP6\nnet/ipv6/Kconfig-113-\ttristate \"IPv6: Mobility\"\n--\nnet/ipv6/Kconfig-119-\nnet/ipv6/Kconfig:120:config IPV6_ILA\nnet/ipv6/Kconfig-121-\ttristate \"IPv6: Identifier Locator Addressing (ILA)\"\n--\nnet/ipv6/Kconfig=146=config INET6_TUNNEL\n--\nnet/ipv6/Kconfig-149-\nnet/ipv6/Kconfig:150:config IPV6_VTI\nnet/ipv6/Kconfig-151-\ttristate \"Virtual (secure) IPv6: tunneling\"\n--\nnet/ipv6/Kconfig-161-\nnet/ipv6/Kconfig:162:config IPV6_SIT\nnet/ipv6/Kconfig-163-\ttristate \"IPv6: IPv6-in-IPv4 tunnel (SIT driver)\"\n--\nnet/ipv6/Kconfig-176-\nnet/ipv6/Kconfig:177:config IPV6_SIT_6RD\nnet/ipv6/Kconfig-178-\tbool \"IPv6: IPv6 Rapid Deployment (6RD)\"\n--\nnet/ipv6/Kconfig-195-\nnet/ipv6/Kconfig:196:config IPV6_NDISC_NODETYPE\nnet/ipv6/Kconfig-197-\tbool\nnet/ipv6/Kconfig-198-\nnet/ipv6/Kconfig:199:config IPV6_TUNNEL\nnet/ipv6/Kconfig-200-\ttristate \"IPv6: IP-in-IPv6 tunnel (RFC2473)\"\n--\nnet/ipv6/Kconfig-209-\nnet/ipv6/Kconfig:210:config IPV6_GRE\nnet/ipv6/Kconfig-211-\ttristate \"IPv6: GRE tunnel\"\n--\nnet/ipv6/Kconfig-227-\nnet/ipv6/Kconfig:228:config IPV6_FOU\nnet/ipv6/Kconfig-229-\ttristate\n--\nnet/ipv6/Kconfig-231-\nnet/ipv6/Kconfig:232:config IPV6_FOU_TUNNEL\nnet/ipv6/Kconfig-233-\ttristate\n--\nnet/ipv6/Kconfig-236-\nnet/ipv6/Kconfig:237:config IPV6_MULTIPLE_TABLES\nnet/ipv6/Kconfig-238-\tbool \"IPv6: Multiple Routing Tables\"\n--\nnet/ipv6/Kconfig-242-\nnet/ipv6/Kconfig:243:config IPV6_SUBTREES\nnet/ipv6/Kconfig-244-\tbool \"IPv6: source address based routing\"\n--\nnet/ipv6/Kconfig-256-\nnet/ipv6/Kconfig:257:config IPV6_MROUTE\nnet/ipv6/Kconfig-258-\tbool \"IPv6: multicast routing\"\n--\nnet/ipv6/Kconfig-264-\nnet/ipv6/Kconfig:265:config IPV6_MROUTE_MULTIPLE_TABLES\nnet/ipv6/Kconfig-266-\tbool \"IPv6: multicast policy routing\"\n--\nnet/ipv6/Kconfig-278-\nnet/ipv6/Kconfig:279:config IPV6_PIMSM_V2\nnet/ipv6/Kconfig-280-\tbool \"IPv6: PIM-SM version 2 support\"\n--\nnet/ipv6/Kconfig-285-\nnet/ipv6/Kconfig:286:config IPV6_SEG6_LWTUNNEL\nnet/ipv6/Kconfig-287-\tbool \"IPv6: Segment Routing Header encapsulation support\"\n--\nnet/ipv6/Kconfig-299-\nnet/ipv6/Kconfig:300:config IPV6_SEG6_HMAC\nnet/ipv6/Kconfig-301-\tbool \"IPv6: Segment Routing HMAC support\"\n--\nnet/ipv6/Kconfig-311-\nnet/ipv6/Kconfig:312:config IPV6_SEG6_BPF\nnet/ipv6/Kconfig-313-\tdef_bool y\n--\nnet/ipv6/Kconfig-316-\nnet/ipv6/Kconfig:317:config IPV6_RPL_LWTUNNEL\nnet/ipv6/Kconfig-318-\tbool \"IPv6: RPL Source Routing Header support\"\n--\nnet/ipv6/Kconfig-327-\nnet/ipv6/Kconfig:328:config IPV6_IOAM6_LWTUNNEL\nnet/ipv6/Kconfig-329-\tbool \"IPv6: IOAM Pre-allocated Trace insertion support\"\n"
}

gemini-3.1-pro-preview

null

null

							input: 21249
							output: 39
							thoughts: 386
						

**Analyzing `getsockopt` Implementation for IPv6**

Okay, let's break this down. The objective is to identify the relevant `getsockopt` entry points related to `IPV6`. Looking at the configuration options, the key ones are `IEEE802154`, `IEEE802154_SOCKET`, `IPV6`, `PHONET`, and `TLS`. Now, focusing on the functions, I have these: `dgram_getsockopt`, `rawv6_getsockopt`, `pep_getsockopt`, and `tls_getsockopt`.

Wait a minute, let me just quickly confirm that there aren't any other functions involved. Aha, I see a bunch of static helper functions: `do_dgram_getsockopt`, `do_rawv6_getsockopt`, `do_pep_getsockopt`, `do_tls_getsockopt_conf`, `do_tls_getsockopt_tx_zc`, `do_tls_getsockopt_no_pad`, `do_tls_getsockopt_tx_payload_len`, and `do_tls_getsockopt`.

The instructions explicitly state a preference for non-static, non-inlined API entrypoints over static helper functions. This means the correct ones to consider are definitely `dgram_getsockopt`, `rawv6_getsockopt`, `pep_getsockopt`, and `tls_getsockopt`.

Now, before I move on, I need to verify something about `dgram_getsockopt`. Let me check if it's the only one of its type in `net/ieee802154/socket.c`. Hold on... there's also `raw_getsockopt`? Hmm, that's unexpected. I need to make sure `raw_getsockopt` is what I think it is and that it hasn't been recently modified.

{
  "Expression": "raw_getsockopt",
  "PathPrefix": "net/ieee802154/socket.c"
}

{
  "Output": "net/ieee802154/socket.c=362=static void ieee802154_raw_deliver(struct net_device *dev, struct sk_buff *skb)\n--\nnet/ieee802154/socket.c-381-\nnet/ieee802154/socket.c:382:static int raw_getsockopt(struct sock *sk, int level, int optname,\nnet/ieee802154/socket.c-383-\t\t\t  char __user *optval, int __user *optlen)\n--\nnet/ieee802154/socket.c=394=static struct proto ieee802154_raw_prot = {\n--\nnet/ieee802154/socket.c-405-\t.disconnect\t= raw_disconnect,\nnet/ieee802154/socket.c:406:\t.getsockopt\t= raw_getsockopt,\nnet/ieee802154/socket.c-407-\t.setsockopt\t= raw_setsockopt,\n"
}

gemini-3.1-pro-preview

null

null

							input: 22392
							output: 204
							thoughts: 475
						

**My Assessment of the Patch's Impact**

Okay, so the initial scan shows that the patch didn't touch anything outside of `dgram_getsockopt` directly. That's a good starting point. Let's see... looking at the other files mentioned, specifically, I can see modifications to `rawv6_getsockopt` in `net/ipv6/raw.c`, `pep_getsockopt` in `net/phonet/pep.c`, and `tls_getsockopt` in `net/tls/tls_main.c`. Those are the main functions being modified, which is what I suspected. It appears that `tools/testing/selftests/net/getsockopt_iter.c` is just a test file, so no need to delve further into that for fuzzing scope.

So, just to be crystal clear, the relevant functions here are `dgram_getsockopt`, `rawv6_getsockopt`, `pep_getsockopt`, and `tls_getsockopt`.

Now for the configs... Based on the functions, we're talking about `IEEE802154`, `IEEE802154_SOCKET`, `IPV6`, `PHONET`, and `TLS`. Just double-checking my assumptions, yes, `TLS` does indeed depend on `INET`, which is always enabled, so no need to worry there. Neither `PHONET` nor `IEEE802154` have any dependencies that are relevant here. `IPV6` also has no direct dependencies for these purposes. I don't see any other config options relevant to the changes to `tls_getsockopt` other than `CONFIG_TLS`.

Right, let's recap my thought process. The patch is changing the implementation of several `getsockopt` handlers – specifically for IEEE 802.15.4 dgram, IPv6 raw, Phonet PEP, and TLS sockets. It's moving them to use the new `sockopt_t` interface and `copy_to_iter` instead of `copy_to_user`. This represents a functional shift in how user space reads socket options, and it affects some core networking protocols. It's important to fuzz these `getsockopt` handlers to be certain that the new implementation is solid and free of regressions or memory corruption issues.

Let's call `set-results`.

{
  "EnableConfigs": [
    "IEEE802154",
    "IEEE802154_SOCKET",
    "IPV6",
    "PHONET",
    "TLS"
  ],
  "FocusSymbols": [
    "dgram_getsockopt",
    "rawv6_getsockopt",
    "pep_getsockopt",
    "tls_getsockopt"
  ],
  "Reasoning": "The patch modifies the getsockopt implementations for IEEE 802.15.4 dgram, IPv6 raw, Phonet PEP, and TLS sockets to use the new sockopt_t interface and copy_to_iter instead of copy_to_user. This is a functional change in how socket options are read by user space, and it affects core networking protocols. Fuzzing these getsockopt handlers is important to ensure no regressions or memory corruption issues were introduced during the conversion.",
  "WorthFuzzing": true
}

{
  "EnableConfigs": [
    "IEEE802154",
    "IEEE802154_SOCKET",
    "IPV6",
    "PHONET",
    "TLS"
  ],
  "FocusSymbols": [
    "dgram_getsockopt",
    "rawv6_getsockopt",
    "pep_getsockopt",
    "tls_getsockopt"
  ],
  "Reasoning": "The patch modifies the getsockopt implementations for IEEE 802.15.4 dgram, IPv6 raw, Phonet PEP, and TLS sockets to use the new sockopt_t interface and copy_to_iter instead of copy_to_user. This is a functional change in how socket options are read by user space, and it affects core networking protocols. Fuzzing these getsockopt handlers is important to ensure no regressions or memory corruption issues were introduced during the conversion.",
  "WorthFuzzing": true
}