| commit | b5bf2cfbfbecb8b4d0369c637569283d05d85cf5 | |
| author | Roland McGrath <roland@redhat.com> | |
| Tue, 14 Sep 2010 19:22:58 +0000 (14 12:22 -0700) | ||
| committer | Greg Kroah-Hartman <gregkh@suse.de> | |
| Mon, 21 Mar 2011 19:44:12 +0000 (21 12:44 -0700) | ||
| tree | 0f7795739f3f4d07f0a8570341d08e012a18f1b6 | treesnapshot (tar.gz zip) |
| parent | 86869f15548105de95cfbf51b240b37a8e1bf35d | commitdiff |
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>
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>
| arch/x86/ia32/ia32entry.S | diffblobblamehistory |