CVE-2024-35795 (GCVE-0-2024-35795)

Vulnerability from cvelistv5 – Published: 2024-05-17 13:23 – Updated: 2025-05-04 09:05
VLAI?
Title
drm/amdgpu: fix deadlock while reading mqd from debugfs
Summary
In the Linux kernel, the following vulnerability has been resolved: drm/amdgpu: fix deadlock while reading mqd from debugfs An errant disk backup on my desktop got into debugfs and triggered the following deadlock scenario in the amdgpu debugfs files. The machine also hard-resets immediately after those lines are printed (although I wasn't able to reproduce that part when reading by hand): [ 1318.016074][ T1082] ====================================================== [ 1318.016607][ T1082] WARNING: possible circular locking dependency detected [ 1318.017107][ T1082] 6.8.0-rc7-00015-ge0c8221b72c0 #17 Not tainted [ 1318.017598][ T1082] ------------------------------------------------------ [ 1318.018096][ T1082] tar/1082 is trying to acquire lock: [ 1318.018585][ T1082] ffff98c44175d6a0 (&mm->mmap_lock){++++}-{3:3}, at: __might_fault+0x40/0x80 [ 1318.019084][ T1082] [ 1318.019084][ T1082] but task is already holding lock: [ 1318.020052][ T1082] ffff98c4c13f55f8 (reservation_ww_class_mutex){+.+.}-{3:3}, at: amdgpu_debugfs_mqd_read+0x6a/0x250 [amdgpu] [ 1318.020607][ T1082] [ 1318.020607][ T1082] which lock already depends on the new lock. [ 1318.020607][ T1082] [ 1318.022081][ T1082] [ 1318.022081][ T1082] the existing dependency chain (in reverse order) is: [ 1318.023083][ T1082] [ 1318.023083][ T1082] -> #2 (reservation_ww_class_mutex){+.+.}-{3:3}: [ 1318.024114][ T1082] __ww_mutex_lock.constprop.0+0xe0/0x12f0 [ 1318.024639][ T1082] ww_mutex_lock+0x32/0x90 [ 1318.025161][ T1082] dma_resv_lockdep+0x18a/0x330 [ 1318.025683][ T1082] do_one_initcall+0x6a/0x350 [ 1318.026210][ T1082] kernel_init_freeable+0x1a3/0x310 [ 1318.026728][ T1082] kernel_init+0x15/0x1a0 [ 1318.027242][ T1082] ret_from_fork+0x2c/0x40 [ 1318.027759][ T1082] ret_from_fork_asm+0x11/0x20 [ 1318.028281][ T1082] [ 1318.028281][ T1082] -> #1 (reservation_ww_class_acquire){+.+.}-{0:0}: [ 1318.029297][ T1082] dma_resv_lockdep+0x16c/0x330 [ 1318.029790][ T1082] do_one_initcall+0x6a/0x350 [ 1318.030263][ T1082] kernel_init_freeable+0x1a3/0x310 [ 1318.030722][ T1082] kernel_init+0x15/0x1a0 [ 1318.031168][ T1082] ret_from_fork+0x2c/0x40 [ 1318.031598][ T1082] ret_from_fork_asm+0x11/0x20 [ 1318.032011][ T1082] [ 1318.032011][ T1082] -> #0 (&mm->mmap_lock){++++}-{3:3}: [ 1318.032778][ T1082] __lock_acquire+0x14bf/0x2680 [ 1318.033141][ T1082] lock_acquire+0xcd/0x2c0 [ 1318.033487][ T1082] __might_fault+0x58/0x80 [ 1318.033814][ T1082] amdgpu_debugfs_mqd_read+0x103/0x250 [amdgpu] [ 1318.034181][ T1082] full_proxy_read+0x55/0x80 [ 1318.034487][ T1082] vfs_read+0xa7/0x360 [ 1318.034788][ T1082] ksys_read+0x70/0xf0 [ 1318.035085][ T1082] do_syscall_64+0x94/0x180 [ 1318.035375][ T1082] entry_SYSCALL_64_after_hwframe+0x46/0x4e [ 1318.035664][ T1082] [ 1318.035664][ T1082] other info that might help us debug this: [ 1318.035664][ T1082] [ 1318.036487][ T1082] Chain exists of: [ 1318.036487][ T1082] &mm->mmap_lock --> reservation_ww_class_acquire --> reservation_ww_class_mutex [ 1318.036487][ T1082] [ 1318.037310][ T1082] Possible unsafe locking scenario: [ 1318.037310][ T1082] [ 1318.037838][ T1082] CPU0 CPU1 [ 1318.038101][ T1082] ---- ---- [ 1318.038350][ T1082] lock(reservation_ww_class_mutex); [ 1318.038590][ T1082] lock(reservation_ww_class_acquire); [ 1318.038839][ T1082] lock(reservation_ww_class_mutex); [ 1318.039083][ T1082] rlock(&mm->mmap_lock); [ 1318.039328][ T1082] [ 1318.039328][ T1082] *** DEADLOCK *** [ 1318.039328][ T1082] [ 1318.040029][ T1082] 1 lock held by tar/1082: [ 1318.040259][ T1082] #0: ffff98c4c13f55f8 (reservation_ww_class_mutex){+.+.}-{3:3}, at: amdgpu_debugfs_mqd_read+0x6a/0x250 [amdgpu] [ 1318.040560][ T1082] [ 1318.040560][ T1082] stack backtrace: [ ---truncated---
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 445d85e3c1dfd8c45b24be6f1527f1e117256d0e , < 197f6d6987c55860f6eea1c93e4f800c59078874 (git)
Affected: 445d85e3c1dfd8c45b24be6f1527f1e117256d0e , < 8b03556da6e576c62664b6cd01809e4a09d53b5b (git)
Affected: 445d85e3c1dfd8c45b24be6f1527f1e117256d0e , < 4687e3c6ee877ee25e57b984eca00be53b9a8db5 (git)
Affected: 445d85e3c1dfd8c45b24be6f1527f1e117256d0e , < 8678b1060ae2b75feb60b87e5b75e17374e3c1c5 (git)
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    Linux Linux Affected: 6.5
Unaffected: 0 , < 6.5 (semver)
Unaffected: 6.6.24 , ≤ 6.6.* (semver)
Unaffected: 6.7.12 , ≤ 6.7.* (semver)
Unaffected: 6.8.3 , ≤ 6.8.* (semver)
Unaffected: 6.9 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdgpu: fix deadlock while reading mqd from debugfs\n\nAn errant disk backup on my desktop got into debugfs and triggered the\nfollowing deadlock scenario in the amdgpu debugfs files. The machine\nalso hard-resets immediately after those lines are printed (although I\nwasn\u0027t able to reproduce that part when reading by hand):\n\n[ 1318.016074][ T1082] ======================================================\n[ 1318.016607][ T1082] WARNING: possible circular locking dependency detected\n[ 1318.017107][ T1082] 6.8.0-rc7-00015-ge0c8221b72c0 #17 Not tainted\n[ 1318.017598][ T1082] ------------------------------------------------------\n[ 1318.018096][ T1082] tar/1082 is trying to acquire lock:\n[ 1318.018585][ T1082] ffff98c44175d6a0 (\u0026mm-\u003emmap_lock){++++}-{3:3}, at: __might_fault+0x40/0x80\n[ 1318.019084][ T1082]\n[ 1318.019084][ T1082] but task is already holding lock:\n[ 1318.020052][ T1082] ffff98c4c13f55f8 (reservation_ww_class_mutex){+.+.}-{3:3}, at: amdgpu_debugfs_mqd_read+0x6a/0x250 [amdgpu]\n[ 1318.020607][ T1082]\n[ 1318.020607][ T1082] which lock already depends on the new lock.\n[ 1318.020607][ T1082]\n[ 1318.022081][ T1082]\n[ 1318.022081][ T1082] the existing dependency chain (in reverse order) is:\n[ 1318.023083][ T1082]\n[ 1318.023083][ T1082] -\u003e #2 (reservation_ww_class_mutex){+.+.}-{3:3}:\n[ 1318.024114][ T1082]        __ww_mutex_lock.constprop.0+0xe0/0x12f0\n[ 1318.024639][ T1082]        ww_mutex_lock+0x32/0x90\n[ 1318.025161][ T1082]        dma_resv_lockdep+0x18a/0x330\n[ 1318.025683][ T1082]        do_one_initcall+0x6a/0x350\n[ 1318.026210][ T1082]        kernel_init_freeable+0x1a3/0x310\n[ 1318.026728][ T1082]        kernel_init+0x15/0x1a0\n[ 1318.027242][ T1082]        ret_from_fork+0x2c/0x40\n[ 1318.027759][ T1082]        ret_from_fork_asm+0x11/0x20\n[ 1318.028281][ T1082]\n[ 1318.028281][ T1082] -\u003e #1 (reservation_ww_class_acquire){+.+.}-{0:0}:\n[ 1318.029297][ T1082]        dma_resv_lockdep+0x16c/0x330\n[ 1318.029790][ T1082]        do_one_initcall+0x6a/0x350\n[ 1318.030263][ T1082]        kernel_init_freeable+0x1a3/0x310\n[ 1318.030722][ T1082]        kernel_init+0x15/0x1a0\n[ 1318.031168][ T1082]        ret_from_fork+0x2c/0x40\n[ 1318.031598][ T1082]        ret_from_fork_asm+0x11/0x20\n[ 1318.032011][ T1082]\n[ 1318.032011][ T1082] -\u003e #0 (\u0026mm-\u003emmap_lock){++++}-{3:3}:\n[ 1318.032778][ T1082]        __lock_acquire+0x14bf/0x2680\n[ 1318.033141][ T1082]        lock_acquire+0xcd/0x2c0\n[ 1318.033487][ T1082]        __might_fault+0x58/0x80\n[ 1318.033814][ T1082]        amdgpu_debugfs_mqd_read+0x103/0x250 [amdgpu]\n[ 1318.034181][ T1082]        full_proxy_read+0x55/0x80\n[ 1318.034487][ T1082]        vfs_read+0xa7/0x360\n[ 1318.034788][ T1082]        ksys_read+0x70/0xf0\n[ 1318.035085][ T1082]        do_syscall_64+0x94/0x180\n[ 1318.035375][ T1082]        entry_SYSCALL_64_after_hwframe+0x46/0x4e\n[ 1318.035664][ T1082]\n[ 1318.035664][ T1082] other info that might help us debug this:\n[ 1318.035664][ T1082]\n[ 1318.036487][ T1082] Chain exists of:\n[ 1318.036487][ T1082]   \u0026mm-\u003emmap_lock --\u003e reservation_ww_class_acquire --\u003e reservation_ww_class_mutex\n[ 1318.036487][ T1082]\n[ 1318.037310][ T1082]  Possible unsafe locking scenario:\n[ 1318.037310][ T1082]\n[ 1318.037838][ T1082]        CPU0                    CPU1\n[ 1318.038101][ T1082]        ----                    ----\n[ 1318.038350][ T1082]   lock(reservation_ww_class_mutex);\n[ 1318.038590][ T1082]                                lock(reservation_ww_class_acquire);\n[ 1318.038839][ T1082]                                lock(reservation_ww_class_mutex);\n[ 1318.039083][ T1082]   rlock(\u0026mm-\u003emmap_lock);\n[ 1318.039328][ T1082]\n[ 1318.039328][ T1082]  *** DEADLOCK ***\n[ 1318.039328][ T1082]\n[ 1318.040029][ T1082] 1 lock held by tar/1082:\n[ 1318.040259][ T1082]  #0: ffff98c4c13f55f8 (reservation_ww_class_mutex){+.+.}-{3:3}, at: amdgpu_debugfs_mqd_read+0x6a/0x250 [amdgpu]\n[ 1318.040560][ T1082]\n[ 1318.040560][ T1082] stack backtrace:\n[\n---truncated---"
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    "vulnrichment": {
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The machine\\nalso hard-resets immediately after those lines are printed (although I\\nwasn\u0027t able to reproduce that part when reading by hand):\\n\\n[ 1318.016074][ T1082] ======================================================\\n[ 1318.016607][ T1082] WARNING: possible circular locking dependency detected\\n[ 1318.017107][ T1082] 6.8.0-rc7-00015-ge0c8221b72c0 #17 Not tainted\\n[ 1318.017598][ T1082] ------------------------------------------------------\\n[ 1318.018096][ T1082] tar/1082 is trying to acquire lock:\\n[ 1318.018585][ T1082] ffff98c44175d6a0 (\u0026mm-\u003emmap_lock){++++}-{3:3}, at: __might_fault+0x40/0x80\\n[ 1318.019084][ T1082]\\n[ 1318.019084][ T1082] but task is already holding lock:\\n[ 1318.020052][ T1082] ffff98c4c13f55f8 (reservation_ww_class_mutex){+.+.}-{3:3}, at: amdgpu_debugfs_mqd_read+0x6a/0x250 [amdgpu]\\n[ 1318.020607][ T1082]\\n[ 1318.020607][ T1082] which lock already depends on the new lock.\\n[ 1318.020607][ T1082]\\n[ 1318.022081][ T1082]\\n[ 1318.022081][ T1082] the existing dependency chain (in reverse order) is:\\n[ 1318.023083][ T1082]\\n[ 1318.023083][ T1082] -\u003e #2 (reservation_ww_class_mutex){+.+.}-{3:3}:\\n[ 1318.024114][ T1082]        __ww_mutex_lock.constprop.0+0xe0/0x12f0\\n[ 1318.024639][ T1082]        ww_mutex_lock+0x32/0x90\\n[ 1318.025161][ T1082]        dma_resv_lockdep+0x18a/0x330\\n[ 1318.025683][ T1082]        do_one_initcall+0x6a/0x350\\n[ 1318.026210][ T1082]        kernel_init_freeable+0x1a3/0x310\\n[ 1318.026728][ T1082]        kernel_init+0x15/0x1a0\\n[ 1318.027242][ T1082]        ret_from_fork+0x2c/0x40\\n[ 1318.027759][ T1082]        ret_from_fork_asm+0x11/0x20\\n[ 1318.028281][ T1082]\\n[ 1318.028281][ T1082] -\u003e #1 (reservation_ww_class_acquire){+.+.}-{0:0}:\\n[ 1318.029297][ T1082]        dma_resv_lockdep+0x16c/0x330\\n[ 1318.029790][ T1082]        do_one_initcall+0x6a/0x350\\n[ 1318.030263][ T1082]        kernel_init_freeable+0x1a3/0x310\\n[ 1318.030722][ T1082]        kernel_init+0x15/0x1a0\\n[ 1318.031168][ T1082]        ret_from_fork+0x2c/0x40\\n[ 1318.031598][ T1082]        ret_from_fork_asm+0x11/0x20\\n[ 1318.032011][ T1082]\\n[ 1318.032011][ T1082] -\u003e #0 (\u0026mm-\u003emmap_lock){++++}-{3:3}:\\n[ 1318.032778][ T1082]        __lock_acquire+0x14bf/0x2680\\n[ 1318.033141][ T1082]        lock_acquire+0xcd/0x2c0\\n[ 1318.033487][ T1082]        __might_fault+0x58/0x80\\n[ 1318.033814][ T1082]        amdgpu_debugfs_mqd_read+0x103/0x250 [amdgpu]\\n[ 1318.034181][ T1082]        full_proxy_read+0x55/0x80\\n[ 1318.034487][ T1082]        vfs_read+0xa7/0x360\\n[ 1318.034788][ T1082]        ksys_read+0x70/0xf0\\n[ 1318.035085][ T1082]        do_syscall_64+0x94/0x180\\n[ 1318.035375][ T1082]        entry_SYSCALL_64_after_hwframe+0x46/0x4e\\n[ 1318.035664][ T1082]\\n[ 1318.035664][ T1082] other info that might help us debug this:\\n[ 1318.035664][ T1082]\\n[ 1318.036487][ T1082] Chain exists of:\\n[ 1318.036487][ T1082]   \u0026mm-\u003emmap_lock --\u003e reservation_ww_class_acquire --\u003e reservation_ww_class_mutex\\n[ 1318.036487][ T1082]\\n[ 1318.037310][ T1082]  Possible unsafe locking scenario:\\n[ 1318.037310][ T1082]\\n[ 1318.037838][ T1082]        CPU0                    CPU1\\n[ 1318.038101][ T1082]        ----                    ----\\n[ 1318.038350][ T1082]   lock(reservation_ww_class_mutex);\\n[ 1318.038590][ T1082]                                lock(reservation_ww_class_acquire);\\n[ 1318.038839][ T1082]                                lock(reservation_ww_class_mutex);\\n[ 1318.039083][ T1082]   rlock(\u0026mm-\u003emmap_lock);\\n[ 1318.039328][ T1082]\\n[ 1318.039328][ T1082]  *** DEADLOCK ***\\n[ 1318.039328][ T1082]\\n[ 1318.040029][ T1082] 1 lock held by tar/1082:\\n[ 1318.040259][ T1082]  #0: ffff98c4c13f55f8 (reservation_ww_class_mutex){+.+.}-{3:3}, at: amdgpu_debugfs_mqd_read+0x6a/0x250 [amdgpu]\\n[ 1318.040560][ T1082]\\n[ 1318.040560][ T1082] stack backtrace:\\n[\\n---truncated---\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.24\", \"versionStartIncluding\": \"6.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.7.12\", \"versionStartIncluding\": \"6.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.8.3\", \"versionStartIncluding\": \"6.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.9\", \"versionStartIncluding\": \"6.5\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-05-04T09:05:35.403Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-35795\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-05-04T09:05:35.403Z\", \"dateReserved\": \"2024-05-17T12:19:12.339Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-05-17T13:23:06.900Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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Sightings

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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.