# CVE-2022-48634: linux: In the Linux kernel, the following vulnerability has been resolved:  drm/gma500: Fix BUG: sleeping function called fr...

CVE-2022-48634 is fixed in linux on 1 platform, first by DEBIAN-CVE-2022-48634, released April 28, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2022-48634
- Priority: Routine
- CVSS: 5.3 (medium)
- EPSS: 0.0017
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Apr 28, 2024

## Description

In the Linux kernel, the following vulnerability has been resolved:  drm/gma500: Fix BUG: sleeping function called from invalid context errors  gma_crtc_page_flip() was holding the event_lock spinlock while calling crtc_funcs->mode_set_base() which takes ww_mutex.  The only reason to hold event_lock is to clear gma_crtc->page_flip_event on mode_set_base() errors.  Instead unlock it after setting gma_crtc->page_flip_event and on errors re-take the lock and clear gma_crtc->page_flip_event it it is still set.  This fixes the following WARN/stacktrace:  [  512.122953] BUG: sleeping function called from invalid context at kernel/locking/mutex.c:870 [  512.123004] in_atomic(): 1, irqs_disabled(): 1, non_block: 0, pid: 1253, name: gnome-shell [  512.123031] preempt_count: 1, expected: 0 [  512.123048] RCU nest depth: 0, expected: 0 [  512.123066] INFO: lockdep is turned off. [  512.123080] irq event stamp: 0 [  512.123094] hardirqs last  enabled at (0): [<0000000000000000>] 0x0 [  512.123134] hardirqs last disabled at (0): [<ffffffff8d0ec28c>] copy_process+0x9fc/0x1de0 [  512.123176] softirqs last  enabled at (0): [<ffffffff8d0ec28c>] copy_process+0x9fc/0x1de0 [  512.123207] softirqs last disabled at (0): [<0000000000000000>] 0x0 [  512.123233] Preemption disabled at: [  512.123241] [<0000000000000000>] 0x0 [  512.123275] CPU: 3 PID: 1253 Comm: gnome-shell Tainted: G        W         5.19.0+ #1 [  512.123304] Hardware name: Packard Bell dot s/SJE01_CT, BIOS V1.10 07/23/2013 [  512.123323] Call Trace: [  512.123346]  <TASK> [  512.123370]  dump_stack_lvl+0x5b/0x77 [  512.123412]  __might_resched.cold+0xff/0x13a [  512.123458]  ww_mutex_lock+0x1e/0xa0 [  512.123495]  psb_gem_pin+0x2c/0x150 [gma500_gfx] [  512.123601]  gma_pipe_set_base+0x76/0x240 [gma500_gfx] [  512.123708]  gma_crtc_page_flip+0x95/0x130 [gma500_gfx] [  512.123808]  drm_mode_page_flip_ioctl+0x57d/0x5d0 [  512.123897]  ? drm_mode_cursor2_ioctl+0x10/0x10 [  512.123936]  drm_ioctl_kernel+0xa1/0x150 [  512.123984]  drm_ioctl+0x21f/0x420 [  512.124025]  ? drm_mode_cursor2_ioctl+0x10/0x10 [  512.124070]  ? rcu_read_lock_bh_held+0xb/0x60 [  512.124104]  ? lock_release+0x1ef/0x2d0 [  512.124161]  __x64_sys_ioctl+0x8d/0xd0 [  512.124203]  do_syscall_64+0x58/0x80 [  512.124239]  ? do_syscall_64+0x67/0x80 [  512.124267]  ? trace_hardirqs_on_prepare+0x55/0xe0 [  512.124300]  ? do_syscall_64+0x67/0x80 [  512.124340]  ? rcu_read_lock_sched_held+0x10/0x80 [  512.124377]  entry_SYSCALL_64_after_hwframe+0x63/0xcd [  512.124411] RIP: 0033:0x7fcc4a70740f [  512.124442] Code: 00 48 89 44 24 18 31 c0 48 8d 44 24 60 c7 04 24 10 00 00 00 48 89 44 24 08 48 8d 44 24 20 48 89 44 24 10 b8 10 00 00 00 0f 05 <89> c2 3d 00 f0 ff ff 77 18 48 8b 44 24 18 64 48 2b 04 25 28 00 00 [  512.124470] RSP: 002b:00007ffda73f5390 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [  512.124503] RAX: ffffffffffffffda RBX: 000055cc9e474500 RCX: 00007fcc4a70740f [  512.124524] RDX: 00007ffda73f5420 RSI: 00000000c01864b0 RDI: 0000000000000009 [  512.124544] RBP: 00007ffda73f5420 R08: 000055cc9c0b0cb0 R09: 0000000000000034 [  512.124564] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000c01864b0 [  512.124584] R13: 0000000000000009 R14: 000055cc9df484d0 R15: 000055cc9af5d0c0 [  512.124647]  </TASK>

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 6.0.2-1 | [DEBIAN-CVE-2022-48634](https://patchblox.com/security/data/fix/linux/debian-cve-2022-48634.md) | Apr 28, 2024 |
| Linux | linux Debian 13.5 (trixie) | 6.0.2-1 | [DEBIAN-CVE-2022-48634](https://patchblox.com/security/data/fix/linux/debian-cve-2022-48634.md) | Apr 28, 2024 |
| Linux | linux Debian 14 | 6.0.2-1 | [DEBIAN-CVE-2022-48634](https://patchblox.com/security/data/fix/linux/debian-cve-2022-48634.md) | Apr 28, 2024 |

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