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SUSE:SLE-12-SP3:GA
xen.2959
56e04674-x86-alternatives-correct-near-branch-c...
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File 56e04674-x86-alternatives-correct-near-branch-check.patch of Package xen.2959
# Commit cd29140ef0e65a33d62e7f5ee843077e51913f01 # Date 2016-03-09 16:51:16 +0100 # Author Jan Beulich <jbeulich@suse.com> # Committer Jan Beulich <jbeulich@suse.com> x86/alternatives: correct near branch check Make sure the near JMP/CALL check doesn't consume uninitialized data, not even in a benign way. And relax the length check at once. Signed-off-by: Jan Beulich <jbeulich@suse.com> Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com> --- a/xen/arch/x86/alternative.c +++ b/xen/arch/x86/alternative.c @@ -175,7 +175,7 @@ static void __init apply_alternatives(st memcpy(insnbuf, replacement, a->replacementlen); /* 0xe8/0xe9 are relative branches; fix the offset. */ - if ( (*insnbuf & 0xfe) == 0xe8 && a->replacementlen == 5 ) + if ( a->replacementlen >= 5 && (*insnbuf & 0xfe) == 0xe8 ) *(s32 *)(insnbuf + 1) += replacement - instr; add_nops(insnbuf + a->replacementlen,
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