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| author |   Andy Lutomirski <luto@kernel.org> | 2025-04-02 11:45:35 +0200 |
|---|---|---|
| committer |   Ingo Molnar <mingo@kernel.org> | 2025-04-12 10:05:46 +0200 |
| commit | 81e3cbdef230fd9adfa8569044b07290afd66708 (patch) | |
| tree | 218cc34bd5a174c4920f89a105d269bf8b090189 /scripts/gdb/linux/utils.py | |
| parent | x86/mm: Add 'mm' argument to unuse_temporary_mm() (diff) | |
| download | linux-rng-81e3cbdef230fd9adfa8569044b07290afd66708.tar.xz linux-rng-81e3cbdef230fd9adfa8569044b07290afd66708.zip | |
x86/events, x86/insn-eval: Remove incorrect current->active_mm references
When decoding an instruction or handling a perf event that references an
LDT segment, if we don't have a valid user context, trying to access the
LDT by any means other than SLDT is racy. Certainly, using
current->active_mm is wrong, as active_mm can point to a real user mm when
CR3 and LDTR no longer reference that mm.
Clean up the code. If nmi_uaccess_okay() says we don't have a valid
context, just fail. Otherwise use current->mm.
Signed-off-by: Andy Lutomirski <luto@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: Rik van Riel <riel@surriel.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Link: https://lore.kernel.org/r/20250402094540.3586683-3-mingo@kernel.org
Diffstat (limited to 'scripts/gdb/linux/utils.py')
0 files changed, 0 insertions, 0 deletions