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| author | Peter Zijlstra <peterz@infradead.org> | 2022-08-19 13:01:35 +0200 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2022-08-19 13:24:33 +0200 |
| commit | 332924973725e8cdcc783c175f68cf7e162cb9e5 (patch) | |
| tree | b76aac38d4f92e8851fe474a237195aed5607373 /arch/x86/include/asm/ia32_unistd.h | |
| parent | 4e3aa9238277597c6c7624f302d81a7b568b6f2d (diff) | |
x86/nospec: Fix i386 RSB stuffing
Turns out that i386 doesn't unconditionally have LFENCE, as such the
loop in __FILL_RETURN_BUFFER isn't actually speculation safe on such
chips.
Fixes: ba6e31af2be9 ("x86/speculation: Add LFENCE to RSB fill sequence")
Reported-by: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/Yv9tj9vbQ9nNlXoY@worktop.programming.kicks-ass.net
Diffstat (limited to 'arch/x86/include/asm/ia32_unistd.h')
0 files changed, 0 insertions, 0 deletions