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cvelistLinuxCVELIST:CVE-2023-52632
HistoryApr 02, 2024 - 6:49 a.m.

CVE-2023-52632 drm/amdkfd: Fix lock dependency warning with srcu

2024-04-0206:49:10
Linux
www.cve.org
linux kernel
fix
lock dependency
warning
srcu
vulnerability
drm/amdkfd

7.6 High

AI Score

Confidence

High

0.0004 Low

EPSS

Percentile

15.5%

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

drm/amdkfd: Fix lock dependency warning with srcu

======================================================
WARNING: possible circular locking dependency detected
6.5.0-kfd-yangp #2289 Not tainted

kworker/0:2/996 is trying to acquire lock:
(srcu){.+.+}-{0:0}, at: __synchronize_srcu+0x5/0x1a0

but task is already holding lock:
((work_completion)(&svms->deferred_list_work)){+.+.}-{0:0}, at:
process_one_work+0x211/0x560

which lock already depends on the new lock.

the existing dependency chain (in reverse order) is:

-> #3 ((work_completion)(&svms->deferred_list_work)){+.+.}-{0:0}:
__flush_work+0x88/0x4f0
svm_range_list_lock_and_flush_work+0x3d/0x110 [amdgpu]
svm_range_set_attr+0xd6/0x14c0 [amdgpu]
kfd_ioctl+0x1d1/0x630 [amdgpu]
__x64_sys_ioctl+0x88/0xc0

-> #2 (&info->lock#2){+.+.}-{3:3}:
__mutex_lock+0x99/0xc70
amdgpu_amdkfd_gpuvm_restore_process_bos+0x54/0x740 [amdgpu]
restore_process_helper+0x22/0x80 [amdgpu]
restore_process_worker+0x2d/0xa0 [amdgpu]
process_one_work+0x29b/0x560
worker_thread+0x3d/0x3d0

-> #1 ((work_completion)(&(&process->restore_work)->work)){+.+.}-{0:0}:
__flush_work+0x88/0x4f0
__cancel_work_timer+0x12c/0x1c0
kfd_process_notifier_release_internal+0x37/0x1f0 [amdgpu]
__mmu_notifier_release+0xad/0x240
exit_mmap+0x6a/0x3a0
mmput+0x6a/0x120
do_exit+0x322/0xb90
do_group_exit+0x37/0xa0
__x64_sys_exit_group+0x18/0x20
do_syscall_64+0x38/0x80

-> #0 (srcu){.+.+}-{0:0}:
__lock_acquire+0x1521/0x2510
lock_sync+0x5f/0x90
__synchronize_srcu+0x4f/0x1a0
__mmu_notifier_release+0x128/0x240
exit_mmap+0x6a/0x3a0
mmput+0x6a/0x120
svm_range_deferred_list_work+0x19f/0x350 [amdgpu]
process_one_work+0x29b/0x560
worker_thread+0x3d/0x3d0

other info that might help us debug this:
Chain exists of:
srcu –> &info->lock#2 –> (work_completion)(&svms->deferred_list_work)

Possible unsafe locking scenario:

    CPU0                    CPU1
    ----                    ----
    lock((work_completion)(&svms->deferred_list_work));
                    lock(&info->lock#2);
		lock((work_completion)(&svms->deferred_list_work));
    sync(srcu);

CNA Affected

[
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "drivers/gpu/drm/amd/amdkfd/kfd_svm.c"
    ],
    "versions": [
      {
        "version": "1da177e4c3f4",
        "lessThan": "b602f098f716",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "1da177e4c3f4",
        "lessThan": "752312f6a794",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "1da177e4c3f4",
        "lessThan": "1556c242e64c",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "1da177e4c3f4",
        "lessThan": "2a9de42e8d3c",
        "status": "affected",
        "versionType": "git"
      }
    ]
  },
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "affected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "drivers/gpu/drm/amd/amdkfd/kfd_svm.c"
    ],
    "versions": [
      {
        "version": "6.1.77",
        "lessThanOrEqual": "6.1.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.6.16",
        "lessThanOrEqual": "6.6.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.7.4",
        "lessThanOrEqual": "6.7.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.8",
        "lessThanOrEqual": "*",
        "status": "unaffected",
        "versionType": "original_commit_for_fix"
      }
    ]
  }
]

7.6 High

AI Score

Confidence

High

0.0004 Low

EPSS

Percentile

15.5%