ghsa-x972-pghh-qmrh
Vulnerability from github
Published
2024-10-21 12:30
Modified
2024-11-08 18:30
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Details

In the Linux kernel, the following vulnerability has been resolved:

can: bcm: Clear bo->bcm_proc_read after remove_proc_entry().

syzbot reported a warning in bcm_release(). [0]

The blamed change fixed another warning that is triggered when connect() is issued again for a socket whose connect()ed device has been unregistered.

However, if the socket is just close()d without the 2nd connect(), the remaining bo->bcm_proc_read triggers unnecessary remove_proc_entry() in bcm_release().

Let's clear bo->bcm_proc_read after remove_proc_entry() in bcm_notify().

[0] name '4986' WARNING: CPU: 0 PID: 5234 at fs/proc/generic.c:711 remove_proc_entry+0x2e7/0x5d0 fs/proc/generic.c:711 Modules linked in: CPU: 0 UID: 0 PID: 5234 Comm: syz-executor606 Not tainted 6.11.0-rc5-syzkaller-00178-g5517ae241919 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 RIP: 0010:remove_proc_entry+0x2e7/0x5d0 fs/proc/generic.c:711 Code: ff eb 05 e8 cb 1e 5e ff 48 8b 5c 24 10 48 c7 c7 e0 f7 aa 8e e8 2a 38 8e 09 90 48 c7 c7 60 3a 1b 8c 48 89 de e8 da 42 20 ff 90 <0f> 0b 90 90 48 8b 44 24 18 48 c7 44 24 40 0e 36 e0 45 49 c7 04 07 RSP: 0018:ffffc9000345fa20 EFLAGS: 00010246 RAX: 2a2d0aee2eb64600 RBX: ffff888032f1f548 RCX: ffff888029431e00 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc9000345fb08 R08: ffffffff8155b2f2 R09: 1ffff1101710519a R10: dffffc0000000000 R11: ffffed101710519b R12: ffff888011d38640 R13: 0000000000000004 R14: 0000000000000000 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff8880b8800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fcfb52722f0 CR3: 000000000e734000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: bcm_release+0x250/0x880 net/can/bcm.c:1578 __sock_release net/socket.c:659 [inline] sock_close+0xbc/0x240 net/socket.c:1421 __fput+0x24a/0x8a0 fs/file_table.c:422 task_work_run+0x24f/0x310 kernel/task_work.c:228 exit_task_work include/linux/task_work.h:40 [inline] do_exit+0xa2f/0x27f0 kernel/exit.c:882 do_group_exit+0x207/0x2c0 kernel/exit.c:1031 __do_sys_exit_group kernel/exit.c:1042 [inline] __se_sys_exit_group kernel/exit.c:1040 [inline] __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1040 x64_sys_call+0x2634/0x2640 arch/x86/include/generated/asm/syscalls_64.h:232 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fcfb51ee969 Code: Unable to access opcode bytes at 0x7fcfb51ee93f. RSP: 002b:00007ffce0109ca8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 00007fcfb51ee969 RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000001 RBP: 00007fcfb526f3b0 R08: ffffffffffffffb8 R09: 0000555500000000 R10: 0000555500000000 R11: 0000000000000246 R12: 00007fcfb526f3b0 R13: 0000000000000000 R14: 00007fcfb5271ee0 R15: 00007fcfb51bf160

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{
  "affected": [],
  "aliases": [
    "CVE-2024-47709"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-10-21T12:15:07Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ncan: bcm: Clear bo-\u003ebcm_proc_read after remove_proc_entry().\n\nsyzbot reported a warning in bcm_release(). [0]\n\nThe blamed change fixed another warning that is triggered when\nconnect() is issued again for a socket whose connect()ed device has\nbeen unregistered.\n\nHowever, if the socket is just close()d without the 2nd connect(), the\nremaining bo-\u003ebcm_proc_read triggers unnecessary remove_proc_entry()\nin bcm_release().\n\nLet\u0027s clear bo-\u003ebcm_proc_read after remove_proc_entry() in bcm_notify().\n\n[0]\nname \u00274986\u0027\nWARNING: CPU: 0 PID: 5234 at fs/proc/generic.c:711 remove_proc_entry+0x2e7/0x5d0 fs/proc/generic.c:711\nModules linked in:\nCPU: 0 UID: 0 PID: 5234 Comm: syz-executor606 Not tainted 6.11.0-rc5-syzkaller-00178-g5517ae241919 #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024\nRIP: 0010:remove_proc_entry+0x2e7/0x5d0 fs/proc/generic.c:711\nCode: ff eb 05 e8 cb 1e 5e ff 48 8b 5c 24 10 48 c7 c7 e0 f7 aa 8e e8 2a 38 8e 09 90 48 c7 c7 60 3a 1b 8c 48 89 de e8 da 42 20 ff 90 \u003c0f\u003e 0b 90 90 48 8b 44 24 18 48 c7 44 24 40 0e 36 e0 45 49 c7 04 07\nRSP: 0018:ffffc9000345fa20 EFLAGS: 00010246\nRAX: 2a2d0aee2eb64600 RBX: ffff888032f1f548 RCX: ffff888029431e00\nRDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000\nRBP: ffffc9000345fb08 R08: ffffffff8155b2f2 R09: 1ffff1101710519a\nR10: dffffc0000000000 R11: ffffed101710519b R12: ffff888011d38640\nR13: 0000000000000004 R14: 0000000000000000 R15: dffffc0000000000\nFS:  0000000000000000(0000) GS:ffff8880b8800000(0000) knlGS:0000000000000000\nCS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 00007fcfb52722f0 CR3: 000000000e734000 CR4: 00000000003506f0\nDR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\nDR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\nCall Trace:\n \u003cTASK\u003e\n bcm_release+0x250/0x880 net/can/bcm.c:1578\n __sock_release net/socket.c:659 [inline]\n sock_close+0xbc/0x240 net/socket.c:1421\n __fput+0x24a/0x8a0 fs/file_table.c:422\n task_work_run+0x24f/0x310 kernel/task_work.c:228\n exit_task_work include/linux/task_work.h:40 [inline]\n do_exit+0xa2f/0x27f0 kernel/exit.c:882\n do_group_exit+0x207/0x2c0 kernel/exit.c:1031\n __do_sys_exit_group kernel/exit.c:1042 [inline]\n __se_sys_exit_group kernel/exit.c:1040 [inline]\n __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1040\n x64_sys_call+0x2634/0x2640 arch/x86/include/generated/asm/syscalls_64.h:232\n do_syscall_x64 arch/x86/entry/common.c:52 [inline]\n do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\nRIP: 0033:0x7fcfb51ee969\nCode: Unable to access opcode bytes at 0x7fcfb51ee93f.\nRSP: 002b:00007ffce0109ca8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7\nRAX: ffffffffffffffda RBX: 0000000000000001 RCX: 00007fcfb51ee969\nRDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000001\nRBP: 00007fcfb526f3b0 R08: ffffffffffffffb8 R09: 0000555500000000\nR10: 0000555500000000 R11: 0000000000000246 R12: 00007fcfb526f3b0\nR13: 0000000000000000 R14: 00007fcfb5271ee0 R15: 00007fcfb51bf160\n \u003c/TASK\u003e",
  "id": "GHSA-x972-pghh-qmrh",
  "modified": "2024-11-08T18:30:44Z",
  "published": "2024-10-21T12:30:55Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-47709"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5cc00913c1fdcab861c4e65fa20d1f1e1bbbf977"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/770b463264426cc3c167b1d44efa85f6a526ce5b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7a145d6ec2124bdb94bd6fc436b342ff6ddf2b70"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/94b0818fa63555a65f6ba107080659ea6bcca63e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9550baada4c8ef8cebefccc746384842820b4dff"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a833da8eec20b51af39643faa7067b25c8b20f3e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b02ed2f01240b226570b4a19b5041d61f5125784"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c3d941cc734e0c8dc486c062926d5249070af5e4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f5059fae5ed518fc56494ce5bdd4f5360de4b3bc"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}


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