diff options
author | Roland McGrath <roland@redhat.com> | 2010-09-14 12:22:58 -0700 |
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committer | Greg Kroah-Hartman <gregkh@suse.de> | 2011-03-21 12:44:12 -0700 |
commit | b5bf2cfbfbecb8b4d0369c637569283d05d85cf5 (patch) | |
tree | 0f7795739f3f4d07f0a8570341d08e012a18f1b6 /include | |
parent | 86869f15548105de95cfbf51b240b37a8e1bf35d (diff) |
x86-64, compat: Retruncate rax after ia32 syscall entry tracing
commit eefdca043e8391dcd719711716492063030b55ac upstream.
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'include')
0 files changed, 0 insertions, 0 deletions