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CVE PROGRAM SOURCE RECORDUnscored

CVE-2022-50173

drm/msm/mdp5: Fix global state lock backoff

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Status
Published
Published
Updated
Assigning organization
Linux

Description

In the Linux kernel, the following vulnerability has been resolved: drm/msm/mdp5: Fix global state lock backoff We need to grab the lock after the early return for !hwpipe case. Otherwise, we could have hit contention yet still returned 0. Fixes an issue that the new CONFIG_DRM_DEBUG_MODESET_LOCK stuff flagged in CI: WARNING: CPU: 0 PID: 282 at drivers/gpu/drm/drm_modeset_lock.c:296 drm_modeset_lock+0xf8/0x154 Modules linked in: CPU: 0 PID: 282 Comm: kms_cursor_lega Tainted: G W 5.19.0-rc2-15930-g875cc8bc536a #1 Hardware name: Qualcomm Technologies, Inc. DB820c (DT) pstate: 60000005 (nZCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : drm_modeset_lock+0xf8/0x154 lr : drm_atomic_get_private_obj_state+0x84/0x170 sp : ffff80000cfab6a0 x29: ffff80000cfab6a0 x28: 0000000000000000 x27: ffff000083bc4d00 x26: 0000000000000038 x25: 0000000000000000 x24: ffff80000957ca58 x23: 0000000000000000 x22: ffff000081ace080 x21: 0000000000000001 x20: ffff000081acec18 x19: ffff80000cfabb80 x18: 0000000000000038 x17: 0000000000000000 x16: 0000000000000000 x15: fffffffffffea0d0 x14: 0000000000000000 x13: 284e4f5f4e524157 x12: 5f534b434f4c5f47 x11: ffff80000a386aa8 x10: 0000000000000029 x9 : ffff80000cfab610 x8 : 0000000000000029 x7 : 0000000000000014 x6 : 0000000000000000 x5 : 0000000000000001 x4 : ffff8000081ad904 x3 : 0000000000000029 x2 : ffff0000801db4c0 x1 : ffff80000cfabb80 x0 : ffff000081aceb58 Call trace: drm_modeset_lock+0xf8/0x154 drm_atomic_get_private_obj_state+0x84/0x170 mdp5_get_global_state+0x54/0x6c mdp5_pipe_release+0x2c/0xd4 mdp5_plane_atomic_check+0x2ec/0x414 drm_atomic_helper_check_planes+0xd8/0x210 drm_atomic_helper_check+0x54/0xb0 ... ---[ end trace 0000000000000000 ]--- drm_modeset_lock attempting to lock a contended lock without backoff: drm_modeset_lock+0x148/0x154 mdp5_get_global_state+0x30/0x6c mdp5_pipe_release+0x2c/0xd4 mdp5_plane_atomic_check+0x290/0x414 drm_atomic_helper_check_planes+0xd8/0x210 drm_atomic_helper_check+0x54/0xb0 drm_atomic_check_only+0x4b0/0x8f4 drm_atomic_commit+0x68/0xe0 Patchwork: https://patchwork.freedesktop.org/patch/492701/

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 776f5c58bfe16cf322d71eeed3c5dda1eeac7e6b to < 247f2934324f9a18d18df24ea4bfcc7d4631d0efaffected
  • b2aa2c4efe93e2580d6a8774b04fe2b99756a322 to < 2e34d6c8180a398de6448a93df25068bf3062042affected
  • 49dc28b4b2e28ef7564e355c91487996c1cbebd7 to < bf386c955f35a0a01bef482b6035d40ff2f6cc75affected
  • 04bef5f1ba8ea6d7c1c8f5f65e0395c62db59cb8 to < f4e3a8c7e890049e7ba2b49ad0315dae841dfa55affected
  • 33dc5aac46e0fad8f5eb193e5906ed0eb6b66ceb to < 2fdf5a54ef9376ff69149a48c5616f1141008c9faffected
  • d59be579fa932c46b908f37509f319cbd4ca9a68 to < 0b07f28c23ff50a7fa5dbc3f6b3b6bd53ac9fc70affected
  • d59be579fa932c46b908f37509f319cbd4ca9a68 to < 92ef86ab513593c6329d04146e61f9a670e72fc5affected
  • 19964dfb39bda4d7716a71009488f0668ecbcf52affected
  • 4.19.247 to < 4.19.256affected
  • 5.4.198 to < 5.4.211affected
  • 5.10.121 to < 5.10.137affected
  • 5.15.46 to < 5.15.61affected
  • 5.18.3 to < 5.18.18affected
  • 5.17.14 to < 5.18affected

Linux Linux

Default version status: affected

  • 5.19affected
  • 0 to < 5.19unaffected
  • 4.19.256 to ≤ 4.19.*unaffected
  • 5.4.211 to ≤ 5.4.*unaffected
  • 5.10.137 to ≤ 5.10.*unaffected
  • 5.15.61 to ≤ 5.15.*unaffected
  • 5.18.18 to ≤ 5.18.*unaffected
  • 5.19.2 to ≤ 5.19.*unaffected
  • 6.0 to ≤ *unaffected

References