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authorRoland McGrath <roland@redhat.com>2010-09-14 12:22:58 -0700
committerH. Peter Anvin <hpa@linux.intel.com>2010-09-14 16:08:47 -0700
commiteefdca043e8391dcd719711716492063030b55ac (patch)
tree38d41d04567876204017fe9618908d7550a579e4 /include
parent36d001c70d8a0144ac1d038f6876c484849a74de (diff)
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x86-64, compat: Retruncate rax after ia32 syscall entry tracing
In commit d4d6715, we reopened an old hole for a 64-bit ptracer touching a 32-bit tracee in system call entry. A %rax value set via ptrace at the entry tracing stop gets used whole as a 32-bit syscall number, while we only check the low 32 bits for validity. Fix it by truncating %rax back to 32 bits after syscall_trace_enter, in addition to testing the full 64 bits as has already been added. Reported-by: Ben Hawkes <hawkes@sota.gen.nz> Signed-off-by: Roland McGrath <roland@redhat.com> Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Diffstat (limited to 'include')
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