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| author | Mukesh Kumar Chaurasiya (IBM) <mkchauras@gmail.com> | 2026-06-15 19:26:17 +0300 |
|---|---|---|
| committer | Madhavan Srinivasan <maddy@linux.ibm.com> | 2026-06-16 12:37:40 +0300 |
| commit | 4e1187e12de40b5301977b2476d21b569358dafb (patch) | |
| tree | b5d8b76c046fe06133885b4a023c82c10d7ac3f3 /include/linux | |
| parent | 5c86f1c1f972761a04bf22f4c0618d1aa714185b (diff) | |
| download | linux-4e1187e12de40b5301977b2476d21b569358dafb.tar.xz | |
powerpc: Restore KUAP registers on syscall restart exit
During a syscall restart, block KUAP so that pending interrupts can be
replayed. The original KUAP state is not restored before returning to
userspace, causing subsequent userspace accesses to fault and eventually
trigger bad_access_pkey(), crashing the kernel.
The original KUAP register values are already saved in
arch_enter_from_user_mode(). Restore them on the syscall restart exit
path before returning to userspace.
Fixes: bee25f97ad24 ("powerpc: Enable GENERIC_ENTRY feature")
Reported-by: Sayali Patil <sayalip@linux.ibm.com>
Closes: https://lore.kernel.org/linuxppc-dev/fcd11556-27ac-4cd7-8c77-50716dec6985@linux.ibm.com/
Signed-off-by: Mukesh Kumar Chaurasiya (IBM) <mkchauras@gmail.com>
Tested-by: Sayali Patil <sayalip@linux.ibm.com>
[Maddy: Added Closes tag]
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/20260615162617.2861795-1-mkchauras@gmail.com
Diffstat (limited to 'include/linux')
0 files changed, 0 insertions, 0 deletions