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| author | Peter Zijlstra <peterz@infradead.org> | 2022-03-08 18:30:56 +0300 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2022-03-15 12:32:47 +0300 |
| commit | ed53a0d971926e484d86cce617ec02a7ee85c3fe (patch) | |
| tree | 1423484f3912113c56c0b77fa5b0397113040828 /drivers/misc | |
| parent | 89bc853eae4ad125030ef99f207ba76c2f00a26e (diff) | |
| download | linux-ed53a0d971926e484d86cce617ec02a7ee85c3fe.tar.xz | |
x86/alternative: Use .ibt_endbr_seal to seal indirect calls
Objtool's --ibt option generates .ibt_endbr_seal which lists
superfluous ENDBR instructions. That is those instructions for which
the function is never indirectly called.
Overwrite these ENDBR instructions with a NOP4 such that these
function can never be indirect called, reducing the number of viable
ENDBR targets in the kernel.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Josh Poimboeuf <jpoimboe@redhat.com>
Link: https://lore.kernel.org/r/20220308154319.822545231@infradead.org
Diffstat (limited to 'drivers/misc')
0 files changed, 0 insertions, 0 deletions