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author | Thomas Gleixner <tglx@linutronix.de> | 2023-12-07 22:49:24 +0300 |
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committer | Borislav Petkov (AMD) <bp@alien8.de> | 2023-12-15 21:34:42 +0300 |
commit | 3ea1704a92967834bf0e64ca1205db4680d04048 (patch) | |
tree | ade272a2d4da541fe47859879d7e7b33d4c931d7 /.gitignore | |
parent | 69a7386c1ec25476a0c78ffeb59de08a2a08f495 (diff) | |
download | linux-3ea1704a92967834bf0e64ca1205db4680d04048.tar.xz |
x86/alternatives: Sync core before enabling interrupts
text_poke_early() does:
local_irq_save(flags);
memcpy(addr, opcode, len);
local_irq_restore(flags);
sync_core();
That's not really correct because the synchronization should happen before
interrupts are re-enabled to ensure that a pending interrupt observes the
complete update of the opcodes.
It's not entirely clear whether the interrupt entry provides enough
serialization already, but moving the sync_core() invocation into interrupt
disabled region does no harm and is obviously correct.
Fixes: 6fffacb30349 ("x86/alternatives, jumplabel: Use text_poke_early() before mm_init()")
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: <stable@kernel.org>
Link: https://lore.kernel.org/r/ZT6narvE%2BLxX%2B7Be@windriver.com
Diffstat (limited to '.gitignore')
0 files changed, 0 insertions, 0 deletions