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Do not replace whole memcpy in apply alternatives 

apply_alternatives uses memcpy() to apply alternatives.  Which has the
unfortunate effect that while applying memcpy alternative to memcpy
itself it tries to overwrite itself with nops - which causes #UD fault
as it overwrites half of an instruction in copy loop, and from this
point on only possible outcome is triplefault and reboot.

So let's overwrite only first two instructions of memcpy - as long as
the main memcpy loop is not in first two bytes it will work fine.

Signed-off-by: Petr Vandrovec <petr@vandrovec.name>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Petr Vandrovec 2007-08-12 10:12:52 +02:00 committed by Linus Torvalds
parent 3864e8ccbb
commit b8d3f2448b
1 changed files with 3 additions and 1 deletions
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4
arch/x86_64/lib/memcpy.S
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@ -124,6 +124,8 @@ ENDPROC(__memcpy)
.quad memcpy
.quad 1b
.byte X86_FEATURE_REP_GOOD
.byte .Lfinal - memcpy
/* Replace only beginning, memcpy is used to apply alternatives, so it
* is silly to overwrite itself with nops - reboot is only outcome... */
.byte 2b - 1b
.byte 2b - 1b
.previous