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(parent: bb44d30) | patch
x86/nospec: Fix i386 RSB stuffing
authorPeter Zijlstra <peterz@infradead.org>
Fri, 19 Aug 2022 11:01:35 +0000 (13:01 +0200)
committerPeter Zijlstra <peterz@infradead.org>
Fri, 19 Aug 2022 11:24:33 +0000 (13:24 +0200)
commitb92702e127bfc618dbc1dee20bac145e0886debf
treeb76aac38d4f92e8851fe474a237195aed5607373tree | snapshot
parentbb44d308838b653ab428618dba5e76599e096cd8commit | 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: b904d9853f6c ("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
arch/x86/include/asm/nospec-branch.h diff | blob | history
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