[PATCH] s390: ptrace peek and poke

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The special cases of peek and poke on acrs[15] and the fpc register are not
handled correctly.  A poke on acrs[15] will clobber the 4 bytes after the
access registers in the thread_info structure.  That happens to be the kernel
stack pointer.  A poke on the fpc with an invalid value is not caught by the
validity check.  On the next context switch the broken fpc value will cause a
program check in the kernel.  Improving the checks in peek and poke fixes
this.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

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Martin Schwidefsky 2005-06-04 15:43:30 -07:00 • committed by Linus Torvalds

parent 854715be73

commit 778959db97

1 changed files with 43 additions and 5 deletions

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arch/s390/kernel/ptrace.c

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