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| author |  Peter Zijlstra <peterz@infradead.org>
| 2023-08-16 13:59:21 +0200 |
|---|---|---|
| committer |  Borislav Petkov (AMD) <bp@alien8.de>
| 2023-08-17 00:44:35 +0200 |
| commit | dbf46008775516f7f25c95b7760041c286299783 (patch) | |
| tree | 6265d866cbcdee6a2cc59298219576055c0807ee /drivers | |
| parent | x86/srso: Explain the untraining sequences a bit more (diff) | |
| download | linux-dbf46008775516f7f25c95b7760041c286299783.tar.gz linux-dbf46008775516f7f25c95b7760041c286299783.tar.bz2 linux-dbf46008775516f7f25c95b7760041c286299783.zip | |
objtool/x86: Fixup frame-pointer vs rethunk
For stack-validation of a frame-pointer build, objtool validates that
every CALL instruction is preceded by a frame-setup. The new SRSO
return thunks violate this with their RSB stuffing trickery.
Extend the __fentry__ exception to also cover the embedded_insn case
used for this. This cures:
vmlinux.o: warning: objtool: srso_untrain_ret+0xd: call without frame pointer save/setup
Fixes: 4ae68b26c3ab ("objtool/x86: Fix SRSO mess")
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Acked-by: Josh Poimboeuf <jpoimboe@kernel.org>
Link: https://lore.kernel.org/r/20230816115921.GH980931@hirez.programming.kicks-ass.net
Diffstat (limited to 'drivers')
0 files changed, 0 insertions, 0 deletions