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| author | Rik van Riel <riel@surriel.com> | 2023-08-17 20:55:58 +0300 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2023-09-18 10:24:15 +0300 |
| commit | 34cf99c250d5cd2530b93a57b0de31d3aaf8685b (patch) | |
| tree | 8708949831d43d7469ed8d74e2fe5f74a20aa503 /arch/x86/lib/memmove_64.S | |
| parent | ce9ecca0238b140b88f43859b211c9fdfd8e5b70 (diff) | |
| download | linux-34cf99c250d5cd2530b93a57b0de31d3aaf8685b.tar.xz | |
x86/mm, kexec, ima: Use memblock_free_late() from ima_free_kexec_buffer()
The code calling ima_free_kexec_buffer() runs long after the memblock
allocator has already been torn down, potentially resulting in a use
after free in memblock_isolate_range().
With KASAN or KFENCE, this use after free will result in a BUG
from the idle task, and a subsequent kernel panic.
Switch ima_free_kexec_buffer() over to memblock_free_late() to avoid
that bug.
Fixes: fee3ff99bc67 ("powerpc: Move arch independent ima kexec functions to drivers/of/kexec.c")
Suggested-by: Mike Rappoport <rppt@kernel.org>
Signed-off-by: Rik van Riel <riel@surriel.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20230817135558.67274c83@imladris.surriel.com
Diffstat (limited to 'arch/x86/lib/memmove_64.S')
0 files changed, 0 insertions, 0 deletions