gsd - gsd-2024-26732

gsd-2024-26732

Vulnerability from gsd

Modified

2024-02-20 06:02

Details

In the Linux kernel, the following vulnerability has been resolved: net: implement lockless setsockopt(SO_PEEK_OFF) syzbot reported a lockdep violation [1] involving af_unix support of SO_PEEK_OFF. Since SO_PEEK_OFF is inherently not thread safe (it uses a per-socket sk_peek_off field), there is really no point to enforce a pointless thread safety in the kernel. After this patch : - setsockopt(SO_PEEK_OFF) no longer acquires the socket lock. - skb_consume_udp() no longer has to acquire the socket lock. - af_unix no longer needs a special version of sk_set_peek_off(), because it does not lock u->iolock anymore. As a followup, we could replace prot->set_peek_off to be a boolean and avoid an indirect call, since we always use sk_set_peek_off(). [1] WARNING: possible circular locking dependency detected 6.8.0-rc4-syzkaller-00267-g0f1dd5e91e2b #0 Not tainted syz-executor.2/30025 is trying to acquire lock: ffff8880765e7d80 (&u->iolock){+.+.}-{3:3}, at: unix_set_peek_off+0x26/0xa0 net/unix/af_unix.c:789 but task is already holding lock: ffff8880765e7930 (sk_lock-AF_UNIX){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1691 [inline] ffff8880765e7930 (sk_lock-AF_UNIX){+.+.}-{0:0}, at: sockopt_lock_sock net/core/sock.c:1060 [inline] ffff8880765e7930 (sk_lock-AF_UNIX){+.+.}-{0:0}, at: sk_setsockopt+0xe52/0x3360 net/core/sock.c:1193 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (sk_lock-AF_UNIX){+.+.}-{0:0}: lock_acquire+0x1e3/0x530 kernel/locking/lockdep.c:5754 lock_sock_nested+0x48/0x100 net/core/sock.c:3524 lock_sock include/net/sock.h:1691 [inline] __unix_dgram_recvmsg+0x1275/0x12c0 net/unix/af_unix.c:2415 sock_recvmsg_nosec+0x18e/0x1d0 net/socket.c:1046 ____sys_recvmsg+0x3c0/0x470 net/socket.c:2801 ___sys_recvmsg net/socket.c:2845 [inline] do_recvmmsg+0x474/0xae0 net/socket.c:2939 __sys_recvmmsg net/socket.c:3018 [inline] __do_sys_recvmmsg net/socket.c:3041 [inline] __se_sys_recvmmsg net/socket.c:3034 [inline] __x64_sys_recvmmsg+0x199/0x250 net/socket.c:3034 do_syscall_64+0xf9/0x240 entry_SYSCALL_64_after_hwframe+0x6f/0x77 -> #0 (&u->iolock){+.+.}-{3:3}: check_prev_add kernel/locking/lockdep.c:3134 [inline] check_prevs_add kernel/locking/lockdep.c:3253 [inline] validate_chain+0x18ca/0x58e0 kernel/locking/lockdep.c:3869 __lock_acquire+0x1345/0x1fd0 kernel/locking/lockdep.c:5137 lock_acquire+0x1e3/0x530 kernel/locking/lockdep.c:5754 __mutex_lock_common kernel/locking/mutex.c:608 [inline] __mutex_lock+0x136/0xd70 kernel/locking/mutex.c:752 unix_set_peek_off+0x26/0xa0 net/unix/af_unix.c:789 sk_setsockopt+0x207e/0x3360 do_sock_setsockopt+0x2fb/0x720 net/socket.c:2307 __sys_setsockopt+0x1ad/0x250 net/socket.c:2334 __do_sys_setsockopt net/socket.c:2343 [inline] __se_sys_setsockopt net/socket.c:2340 [inline] __x64_sys_setsockopt+0xb5/0xd0 net/socket.c:2340 do_syscall_64+0xf9/0x240 entry_SYSCALL_64_after_hwframe+0x6f/0x77 other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(sk_lock-AF_UNIX); lock(&u->iolock); lock(sk_lock-AF_UNIX); lock(&u->iolock); *** DEADLOCK *** 1 lock held by syz-executor.2/30025: #0: ffff8880765e7930 (sk_lock-AF_UNIX){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1691 [inline] #0: ffff8880765e7930 (sk_lock-AF_UNIX){+.+.}-{0:0}, at: sockopt_lock_sock net/core/sock.c:1060 [inline] #0: ffff8880765e7930 (sk_lock-AF_UNIX){+.+.}-{0:0}, at: sk_setsockopt+0xe52/0x3360 net/core/sock.c:1193 stack backtrace: CPU: 0 PID: 30025 Comm: syz-executor.2 Not tainted 6.8.0-rc4-syzkaller-00267-g0f1dd5e91e2b #0 Hardware name: Google Google C ---truncated---

Aliases

CVE-2024-26732

JSON

To clipboard

{
  "gsd": {
    "metadata": {
      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
    },
    "osvSchema": {
      "aliases": [
        "CVE-2024-26732"
      ],
      "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: implement lockless setsockopt(SO_PEEK_OFF)\n\nsyzbot reported a lockdep violation [1] involving af_unix\nsupport of SO_PEEK_OFF.\n\nSince SO_PEEK_OFF is inherently not thread safe (it uses a per-socket\nsk_peek_off field), there is really no point to enforce a pointless\nthread safety in the kernel.\n\nAfter this patch :\n\n- setsockopt(SO_PEEK_OFF) no longer acquires the socket lock.\n\n- skb_consume_udp() no longer has to acquire the socket lock.\n\n- af_unix no longer needs a special version of sk_set_peek_off(),\n  because it does not lock u-\u003eiolock anymore.\n\nAs a followup, we could replace prot-\u003eset_peek_off to be a boolean\nand avoid an indirect call, since we always use sk_set_peek_off().\n\n[1]\n\nWARNING: possible circular locking dependency detected\n6.8.0-rc4-syzkaller-00267-g0f1dd5e91e2b #0 Not tainted\n\nsyz-executor.2/30025 is trying to acquire lock:\n ffff8880765e7d80 (\u0026u-\u003eiolock){+.+.}-{3:3}, at: unix_set_peek_off+0x26/0xa0 net/unix/af_unix.c:789\n\nbut task is already holding lock:\n ffff8880765e7930 (sk_lock-AF_UNIX){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1691 [inline]\n ffff8880765e7930 (sk_lock-AF_UNIX){+.+.}-{0:0}, at: sockopt_lock_sock net/core/sock.c:1060 [inline]\n ffff8880765e7930 (sk_lock-AF_UNIX){+.+.}-{0:0}, at: sk_setsockopt+0xe52/0x3360 net/core/sock.c:1193\n\nwhich lock already depends on the new lock.\n\nthe existing dependency chain (in reverse order) is:\n\n-\u003e #1 (sk_lock-AF_UNIX){+.+.}-{0:0}:\n        lock_acquire+0x1e3/0x530 kernel/locking/lockdep.c:5754\n        lock_sock_nested+0x48/0x100 net/core/sock.c:3524\n        lock_sock include/net/sock.h:1691 [inline]\n        __unix_dgram_recvmsg+0x1275/0x12c0 net/unix/af_unix.c:2415\n        sock_recvmsg_nosec+0x18e/0x1d0 net/socket.c:1046\n        ____sys_recvmsg+0x3c0/0x470 net/socket.c:2801\n        ___sys_recvmsg net/socket.c:2845 [inline]\n        do_recvmmsg+0x474/0xae0 net/socket.c:2939\n        __sys_recvmmsg net/socket.c:3018 [inline]\n        __do_sys_recvmmsg net/socket.c:3041 [inline]\n        __se_sys_recvmmsg net/socket.c:3034 [inline]\n        __x64_sys_recvmmsg+0x199/0x250 net/socket.c:3034\n       do_syscall_64+0xf9/0x240\n       entry_SYSCALL_64_after_hwframe+0x6f/0x77\n\n-\u003e #0 (\u0026u-\u003eiolock){+.+.}-{3:3}:\n        check_prev_add kernel/locking/lockdep.c:3134 [inline]\n        check_prevs_add kernel/locking/lockdep.c:3253 [inline]\n        validate_chain+0x18ca/0x58e0 kernel/locking/lockdep.c:3869\n        __lock_acquire+0x1345/0x1fd0 kernel/locking/lockdep.c:5137\n        lock_acquire+0x1e3/0x530 kernel/locking/lockdep.c:5754\n        __mutex_lock_common kernel/locking/mutex.c:608 [inline]\n        __mutex_lock+0x136/0xd70 kernel/locking/mutex.c:752\n        unix_set_peek_off+0x26/0xa0 net/unix/af_unix.c:789\n       sk_setsockopt+0x207e/0x3360\n        do_sock_setsockopt+0x2fb/0x720 net/socket.c:2307\n        __sys_setsockopt+0x1ad/0x250 net/socket.c:2334\n        __do_sys_setsockopt net/socket.c:2343 [inline]\n        __se_sys_setsockopt net/socket.c:2340 [inline]\n        __x64_sys_setsockopt+0xb5/0xd0 net/socket.c:2340\n       do_syscall_64+0xf9/0x240\n       entry_SYSCALL_64_after_hwframe+0x6f/0x77\n\nother info that might help us debug this:\n\n Possible unsafe locking scenario:\n\n       CPU0                    CPU1\n       ----                    ----\n  lock(sk_lock-AF_UNIX);\n                               lock(\u0026u-\u003eiolock);\n                               lock(sk_lock-AF_UNIX);\n  lock(\u0026u-\u003eiolock);\n\n *** DEADLOCK ***\n\n1 lock held by syz-executor.2/30025:\n  #0: ffff8880765e7930 (sk_lock-AF_UNIX){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1691 [inline]\n  #0: ffff8880765e7930 (sk_lock-AF_UNIX){+.+.}-{0:0}, at: sockopt_lock_sock net/core/sock.c:1060 [inline]\n  #0: ffff8880765e7930 (sk_lock-AF_UNIX){+.+.}-{0:0}, at: sk_setsockopt+0xe52/0x3360 net/core/sock.c:1193\n\nstack backtrace:\nCPU: 0 PID: 30025 Comm: syz-executor.2 Not tainted 6.8.0-rc4-syzkaller-00267-g0f1dd5e91e2b #0\nHardware name: Google Google C\n---truncated---",
      "id": "GSD-2024-26732",
      "modified": "2024-02-20T06:02:29.080443Z",
      "schema_version": "1.4.0"
    }
  },
  "namespaces": {
    "cve.org": {
      "CVE_data_meta": {
        "ASSIGNER": "cve@kernel.org",
        "ID": "CVE-2024-26732",
        "STATE": "PUBLIC"
      },
      "affects": {
        "vendor": {
          "vendor_data": [
            {
              "product": {
                "product_data": [
                  {
                    "product_name": "Linux",
                    "version": {
                      "version_data": [
                        {
                          "version_affected": "\u003c",
                          "version_name": "859051dd165e",
                          "version_value": "897f75e2cde8"
                        },
                        {
                          "version_value": "not down converted",
                          "x_cve_json_5_version_data": {
                            "defaultStatus": "affected",
                            "versions": [
                              {
                                "status": "affected",
                                "version": "6.7"
                              },
                              {
                                "lessThan": "6.7",
                                "status": "unaffected",
                                "version": "0",
                                "versionType": "custom"
                              },
                              {
                                "lessThanOrEqual": "6.7.*",
                                "status": "unaffected",
                                "version": "6.7.7",
                                "versionType": "custom"
                              },
                              {
                                "lessThanOrEqual": "*",
                                "status": "unaffected",
                                "version": "6.8",
                                "versionType": "original_commit_for_fix"
                              }
                            ]
                          }
                        }
                      ]
                    }
                  }
                ]
              },
              "vendor_name": "Linux"
            }
          ]
        }
      },
      "data_format": "MITRE",
      "data_type": "CVE",
      "data_version": "4.0",
      "description": {
        "description_data": [
          {
            "lang": "eng",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: implement lockless setsockopt(SO_PEEK_OFF)\n\nsyzbot reported a lockdep violation [1] involving af_unix\nsupport of SO_PEEK_OFF.\n\nSince SO_PEEK_OFF is inherently not thread safe (it uses a per-socket\nsk_peek_off field), there is really no point to enforce a pointless\nthread safety in the kernel.\n\nAfter this patch :\n\n- setsockopt(SO_PEEK_OFF) no longer acquires the socket lock.\n\n- skb_consume_udp() no longer has to acquire the socket lock.\n\n- af_unix no longer needs a special version of sk_set_peek_off(),\n  because it does not lock u-\u003eiolock anymore.\n\nAs a followup, we could replace prot-\u003eset_peek_off to be a boolean\nand avoid an indirect call, since we always use sk_set_peek_off().\n\n[1]\n\nWARNING: possible circular locking dependency detected\n6.8.0-rc4-syzkaller-00267-g0f1dd5e91e2b #0 Not tainted\n\nsyz-executor.2/30025 is trying to acquire lock:\n ffff8880765e7d80 (\u0026u-\u003eiolock){+.+.}-{3:3}, at: unix_set_peek_off+0x26/0xa0 net/unix/af_unix.c:789\n\nbut task is already holding lock:\n ffff8880765e7930 (sk_lock-AF_UNIX){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1691 [inline]\n ffff8880765e7930 (sk_lock-AF_UNIX){+.+.}-{0:0}, at: sockopt_lock_sock net/core/sock.c:1060 [inline]\n ffff8880765e7930 (sk_lock-AF_UNIX){+.+.}-{0:0}, at: sk_setsockopt+0xe52/0x3360 net/core/sock.c:1193\n\nwhich lock already depends on the new lock.\n\nthe existing dependency chain (in reverse order) is:\n\n-\u003e #1 (sk_lock-AF_UNIX){+.+.}-{0:0}:\n        lock_acquire+0x1e3/0x530 kernel/locking/lockdep.c:5754\n        lock_sock_nested+0x48/0x100 net/core/sock.c:3524\n        lock_sock include/net/sock.h:1691 [inline]\n        __unix_dgram_recvmsg+0x1275/0x12c0 net/unix/af_unix.c:2415\n        sock_recvmsg_nosec+0x18e/0x1d0 net/socket.c:1046\n        ____sys_recvmsg+0x3c0/0x470 net/socket.c:2801\n        ___sys_recvmsg net/socket.c:2845 [inline]\n        do_recvmmsg+0x474/0xae0 net/socket.c:2939\n        __sys_recvmmsg net/socket.c:3018 [inline]\n        __do_sys_recvmmsg net/socket.c:3041 [inline]\n        __se_sys_recvmmsg net/socket.c:3034 [inline]\n        __x64_sys_recvmmsg+0x199/0x250 net/socket.c:3034\n       do_syscall_64+0xf9/0x240\n       entry_SYSCALL_64_after_hwframe+0x6f/0x77\n\n-\u003e #0 (\u0026u-\u003eiolock){+.+.}-{3:3}:\n        check_prev_add kernel/locking/lockdep.c:3134 [inline]\n        check_prevs_add kernel/locking/lockdep.c:3253 [inline]\n        validate_chain+0x18ca/0x58e0 kernel/locking/lockdep.c:3869\n        __lock_acquire+0x1345/0x1fd0 kernel/locking/lockdep.c:5137\n        lock_acquire+0x1e3/0x530 kernel/locking/lockdep.c:5754\n        __mutex_lock_common kernel/locking/mutex.c:608 [inline]\n        __mutex_lock+0x136/0xd70 kernel/locking/mutex.c:752\n        unix_set_peek_off+0x26/0xa0 net/unix/af_unix.c:789\n       sk_setsockopt+0x207e/0x3360\n        do_sock_setsockopt+0x2fb/0x720 net/socket.c:2307\n        __sys_setsockopt+0x1ad/0x250 net/socket.c:2334\n        __do_sys_setsockopt net/socket.c:2343 [inline]\n        __se_sys_setsockopt net/socket.c:2340 [inline]\n        __x64_sys_setsockopt+0xb5/0xd0 net/socket.c:2340\n       do_syscall_64+0xf9/0x240\n       entry_SYSCALL_64_after_hwframe+0x6f/0x77\n\nother info that might help us debug this:\n\n Possible unsafe locking scenario:\n\n       CPU0                    CPU1\n       ----                    ----\n  lock(sk_lock-AF_UNIX);\n                               lock(\u0026u-\u003eiolock);\n                               lock(sk_lock-AF_UNIX);\n  lock(\u0026u-\u003eiolock);\n\n *** DEADLOCK ***\n\n1 lock held by syz-executor.2/30025:\n  #0: ffff8880765e7930 (sk_lock-AF_UNIX){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1691 [inline]\n  #0: ffff8880765e7930 (sk_lock-AF_UNIX){+.+.}-{0:0}, at: sockopt_lock_sock net/core/sock.c:1060 [inline]\n  #0: ffff8880765e7930 (sk_lock-AF_UNIX){+.+.}-{0:0}, at: sk_setsockopt+0xe52/0x3360 net/core/sock.c:1193\n\nstack backtrace:\nCPU: 0 PID: 30025 Comm: syz-executor.2 Not tainted 6.8.0-rc4-syzkaller-00267-g0f1dd5e91e2b #0\nHardware name: Google Google C\n---truncated---"
          }
        ]
      },
      "generator": {
        "engine": "bippy-d3b290d2becc"
      },
      "problemtype": {
        "problemtype_data": [
          {
            "description": [
              {
                "lang": "eng",
                "value": "n/a"
              }
            ]
          }
        ]
      },
      "references": {
        "reference_data": [
          {
            "name": "https://git.kernel.org/stable/c/897f75e2cde8a5f9f7529b55249af1fa4248c83b",
            "refsource": "MISC",
            "url": "https://git.kernel.org/stable/c/897f75e2cde8a5f9f7529b55249af1fa4248c83b"
          },
          {
            "name": "https://git.kernel.org/stable/c/56667da7399eb19af857e30f41bea89aa6fa812c",
            "refsource": "MISC",
            "url": "https://git.kernel.org/stable/c/56667da7399eb19af857e30f41bea89aa6fa812c"
          }
        ]
      }
    },
    "nvd.nist.gov": {
      "cve": {
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: implement lockless setsockopt(SO_PEEK_OFF)\n\nsyzbot reported a lockdep violation [1] involving af_unix\nsupport of SO_PEEK_OFF.\n\nSince SO_PEEK_OFF is inherently not thread safe (it uses a per-socket\nsk_peek_off field), there is really no point to enforce a pointless\nthread safety in the kernel.\n\nAfter this patch :\n\n- setsockopt(SO_PEEK_OFF) no longer acquires the socket lock.\n\n- skb_consume_udp() no longer has to acquire the socket lock.\n\n- af_unix no longer needs a special version of sk_set_peek_off(),\n  because it does not lock u-\u003eiolock anymore.\n\nAs a followup, we could replace prot-\u003eset_peek_off to be a boolean\nand avoid an indirect call, since we always use sk_set_peek_off().\n\n[1]\n\nWARNING: possible circular locking dependency detected\n6.8.0-rc4-syzkaller-00267-g0f1dd5e91e2b #0 Not tainted\n\nsyz-executor.2/30025 is trying to acquire lock:\n ffff8880765e7d80 (\u0026u-\u003eiolock){+.+.}-{3:3}, at: unix_set_peek_off+0x26/0xa0 net/unix/af_unix.c:789\n\nbut task is already holding lock:\n ffff8880765e7930 (sk_lock-AF_UNIX){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1691 [inline]\n ffff8880765e7930 (sk_lock-AF_UNIX){+.+.}-{0:0}, at: sockopt_lock_sock net/core/sock.c:1060 [inline]\n ffff8880765e7930 (sk_lock-AF_UNIX){+.+.}-{0:0}, at: sk_setsockopt+0xe52/0x3360 net/core/sock.c:1193\n\nwhich lock already depends on the new lock.\n\nthe existing dependency chain (in reverse order) is:\n\n-\u003e #1 (sk_lock-AF_UNIX){+.+.}-{0:0}:\n        lock_acquire+0x1e3/0x530 kernel/locking/lockdep.c:5754\n        lock_sock_nested+0x48/0x100 net/core/sock.c:3524\n        lock_sock include/net/sock.h:1691 [inline]\n        __unix_dgram_recvmsg+0x1275/0x12c0 net/unix/af_unix.c:2415\n        sock_recvmsg_nosec+0x18e/0x1d0 net/socket.c:1046\n        ____sys_recvmsg+0x3c0/0x470 net/socket.c:2801\n        ___sys_recvmsg net/socket.c:2845 [inline]\n        do_recvmmsg+0x474/0xae0 net/socket.c:2939\n        __sys_recvmmsg net/socket.c:3018 [inline]\n        __do_sys_recvmmsg net/socket.c:3041 [inline]\n        __se_sys_recvmmsg net/socket.c:3034 [inline]\n        __x64_sys_recvmmsg+0x199/0x250 net/socket.c:3034\n       do_syscall_64+0xf9/0x240\n       entry_SYSCALL_64_after_hwframe+0x6f/0x77\n\n-\u003e #0 (\u0026u-\u003eiolock){+.+.}-{3:3}:\n        check_prev_add kernel/locking/lockdep.c:3134 [inline]\n        check_prevs_add kernel/locking/lockdep.c:3253 [inline]\n        validate_chain+0x18ca/0x58e0 kernel/locking/lockdep.c:3869\n        __lock_acquire+0x1345/0x1fd0 kernel/locking/lockdep.c:5137\n        lock_acquire+0x1e3/0x530 kernel/locking/lockdep.c:5754\n        __mutex_lock_common kernel/locking/mutex.c:608 [inline]\n        __mutex_lock+0x136/0xd70 kernel/locking/mutex.c:752\n        unix_set_peek_off+0x26/0xa0 net/unix/af_unix.c:789\n       sk_setsockopt+0x207e/0x3360\n        do_sock_setsockopt+0x2fb/0x720 net/socket.c:2307\n        __sys_setsockopt+0x1ad/0x250 net/socket.c:2334\n        __do_sys_setsockopt net/socket.c:2343 [inline]\n        __se_sys_setsockopt net/socket.c:2340 [inline]\n        __x64_sys_setsockopt+0xb5/0xd0 net/socket.c:2340\n       do_syscall_64+0xf9/0x240\n       entry_SYSCALL_64_after_hwframe+0x6f/0x77\n\nother info that might help us debug this:\n\n Possible unsafe locking scenario:\n\n       CPU0                    CPU1\n       ----                    ----\n  lock(sk_lock-AF_UNIX);\n                               lock(\u0026u-\u003eiolock);\n                               lock(sk_lock-AF_UNIX);\n  lock(\u0026u-\u003eiolock);\n\n *** DEADLOCK ***\n\n1 lock held by syz-executor.2/30025:\n  #0: ffff8880765e7930 (sk_lock-AF_UNIX){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1691 [inline]\n  #0: ffff8880765e7930 (sk_lock-AF_UNIX){+.+.}-{0:0}, at: sockopt_lock_sock net/core/sock.c:1060 [inline]\n  #0: ffff8880765e7930 (sk_lock-AF_UNIX){+.+.}-{0:0}, at: sk_setsockopt+0xe52/0x3360 net/core/sock.c:1193\n\nstack backtrace:\nCPU: 0 PID: 30025 Comm: syz-executor.2 Not tainted 6.8.0-rc4-syzkaller-00267-g0f1dd5e91e2b #0\nHardware name: Google Google C\n---truncated---"
          }
        ],
        "id": "CVE-2024-26732",
        "lastModified": "2024-04-03T17:24:18.150",
        "metrics": {},
        "published": "2024-04-03T17:15:50.977",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/56667da7399eb19af857e30f41bea89aa6fa812c"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/897f75e2cde8a5f9f7529b55249af1fa4248c83b"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Awaiting Analysis"
      }
    }
  }
}

cve-2024-26732

Vulnerability from cvelistv5

Published

2024-04-03 17:00

Modified

2024-11-05 09:14

Severity ?

Summary

net: implement lockless setsockopt(SO_PEEK_OFF)

References

▼	URL	Tags
	https://git.kernel.org/stable/c/897f75e2cde8a5f9f7529b55249af1fa4248c83b
	https://git.kernel.org/stable/c/56667da7399eb19af857e30f41bea89aa6fa812c

Impacted products

▼	Vendor	Product
	Linux	Linux
	Linux	Linux

Show details on NVD website

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{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2024-26732",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2024-06-17T19:28:35.916343Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2024-06-17T19:28:53.102Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      },
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-02T00:14:12.930Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
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        "references": [
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            "tags": [
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            "url": "https://git.kernel.org/stable/c/897f75e2cde8a5f9f7529b55249af1fa4248c83b"
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            "url": "https://git.kernel.org/stable/c/56667da7399eb19af857e30f41bea89aa6fa812c"
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        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/core/sock.c",
            "net/ipv4/udp.c",
            "net/unix/af_unix.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "897f75e2cde8",
              "status": "affected",
              "version": "859051dd165e",
              "versionType": "git"
            },
            {
              "lessThan": "56667da7399e",
              "status": "affected",
              "version": "859051dd165e",
              "versionType": "git"
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        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/core/sock.c",
            "net/ipv4/udp.c",
            "net/unix/af_unix.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.7"
            },
            {
              "lessThan": "6.7",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
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              "lessThanOrEqual": "6.7.*",
              "status": "unaffected",
              "version": "6.7.7",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.8",
              "versionType": "original_commit_for_fix"
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        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: implement lockless setsockopt(SO_PEEK_OFF)\n\nsyzbot reported a lockdep violation [1] involving af_unix\nsupport of SO_PEEK_OFF.\n\nSince SO_PEEK_OFF is inherently not thread safe (it uses a per-socket\nsk_peek_off field), there is really no point to enforce a pointless\nthread safety in the kernel.\n\nAfter this patch :\n\n- setsockopt(SO_PEEK_OFF) no longer acquires the socket lock.\n\n- skb_consume_udp() no longer has to acquire the socket lock.\n\n- af_unix no longer needs a special version of sk_set_peek_off(),\n  because it does not lock u-\u003eiolock anymore.\n\nAs a followup, we could replace prot-\u003eset_peek_off to be a boolean\nand avoid an indirect call, since we always use sk_set_peek_off().\n\n[1]\n\nWARNING: possible circular locking dependency detected\n6.8.0-rc4-syzkaller-00267-g0f1dd5e91e2b #0 Not tainted\n\nsyz-executor.2/30025 is trying to acquire lock:\n ffff8880765e7d80 (\u0026u-\u003eiolock){+.+.}-{3:3}, at: unix_set_peek_off+0x26/0xa0 net/unix/af_unix.c:789\n\nbut task is already holding lock:\n ffff8880765e7930 (sk_lock-AF_UNIX){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1691 [inline]\n ffff8880765e7930 (sk_lock-AF_UNIX){+.+.}-{0:0}, at: sockopt_lock_sock net/core/sock.c:1060 [inline]\n ffff8880765e7930 (sk_lock-AF_UNIX){+.+.}-{0:0}, at: sk_setsockopt+0xe52/0x3360 net/core/sock.c:1193\n\nwhich lock already depends on the new lock.\n\nthe existing dependency chain (in reverse order) is:\n\n-\u003e #1 (sk_lock-AF_UNIX){+.+.}-{0:0}:\n        lock_acquire+0x1e3/0x530 kernel/locking/lockdep.c:5754\n        lock_sock_nested+0x48/0x100 net/core/sock.c:3524\n        lock_sock include/net/sock.h:1691 [inline]\n        __unix_dgram_recvmsg+0x1275/0x12c0 net/unix/af_unix.c:2415\n        sock_recvmsg_nosec+0x18e/0x1d0 net/socket.c:1046\n        ____sys_recvmsg+0x3c0/0x470 net/socket.c:2801\n        ___sys_recvmsg net/socket.c:2845 [inline]\n        do_recvmmsg+0x474/0xae0 net/socket.c:2939\n        __sys_recvmmsg net/socket.c:3018 [inline]\n        __do_sys_recvmmsg net/socket.c:3041 [inline]\n        __se_sys_recvmmsg net/socket.c:3034 [inline]\n        __x64_sys_recvmmsg+0x199/0x250 net/socket.c:3034\n       do_syscall_64+0xf9/0x240\n       entry_SYSCALL_64_after_hwframe+0x6f/0x77\n\n-\u003e #0 (\u0026u-\u003eiolock){+.+.}-{3:3}:\n        check_prev_add kernel/locking/lockdep.c:3134 [inline]\n        check_prevs_add kernel/locking/lockdep.c:3253 [inline]\n        validate_chain+0x18ca/0x58e0 kernel/locking/lockdep.c:3869\n        __lock_acquire+0x1345/0x1fd0 kernel/locking/lockdep.c:5137\n        lock_acquire+0x1e3/0x530 kernel/locking/lockdep.c:5754\n        __mutex_lock_common kernel/locking/mutex.c:608 [inline]\n        __mutex_lock+0x136/0xd70 kernel/locking/mutex.c:752\n        unix_set_peek_off+0x26/0xa0 net/unix/af_unix.c:789\n       sk_setsockopt+0x207e/0x3360\n        do_sock_setsockopt+0x2fb/0x720 net/socket.c:2307\n        __sys_setsockopt+0x1ad/0x250 net/socket.c:2334\n        __do_sys_setsockopt net/socket.c:2343 [inline]\n        __se_sys_setsockopt net/socket.c:2340 [inline]\n        __x64_sys_setsockopt+0xb5/0xd0 net/socket.c:2340\n       do_syscall_64+0xf9/0x240\n       entry_SYSCALL_64_after_hwframe+0x6f/0x77\n\nother info that might help us debug this:\n\n Possible unsafe locking scenario:\n\n       CPU0                    CPU1\n       ----                    ----\n  lock(sk_lock-AF_UNIX);\n                               lock(\u0026u-\u003eiolock);\n                               lock(sk_lock-AF_UNIX);\n  lock(\u0026u-\u003eiolock);\n\n *** DEADLOCK ***\n\n1 lock held by syz-executor.2/30025:\n  #0: ffff8880765e7930 (sk_lock-AF_UNIX){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1691 [inline]\n  #0: ffff8880765e7930 (sk_lock-AF_UNIX){+.+.}-{0:0}, at: sockopt_lock_sock net/core/sock.c:1060 [inline]\n  #0: ffff8880765e7930 (sk_lock-AF_UNIX){+.+.}-{0:0}, at: sk_setsockopt+0xe52/0x3360 net/core/sock.c:1193\n\nstack backtrace:\nCPU: 0 PID: 30025 Comm: syz-executor.2 Not tainted 6.8.0-rc4-syzkaller-00267-g0f1dd5e91e2b #0\nHardware name: Google Google C\n---truncated---"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2024-11-05T09:14:43.384Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/897f75e2cde8a5f9f7529b55249af1fa4248c83b"
        },
        {
          "url": "https://git.kernel.org/stable/c/56667da7399eb19af857e30f41bea89aa6fa812c"
        }
      ],
      "title": "net: implement lockless setsockopt(SO_PEEK_OFF)",
      "x_generator": {
        "engine": "bippy-9e1c9544281a"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2024-26732",
    "datePublished": "2024-04-03T17:00:19.722Z",
    "dateReserved": "2024-02-19T14:20:24.165Z",
    "dateUpdated": "2024-11-05T09:14:43.384Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}

Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
Confirmed: The vulnerability is confirmed from an analyst perspective.
Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
Patched: This vulnerability was successfully patched by the user reporting the sighting.
Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
Not confirmed: The user expresses doubt about the veracity of the vulnerability.
Not patched: This vulnerability was not successfully patched by the user reporting the sighting.

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