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authorH.J. Lu <hjl.tools@gmail.com>2012-05-21 20:29:45 -0700
committerH. Peter Anvin <hpa@zytor.com>2012-06-01 13:54:21 -0700
commitbad1a753d4d4deb09d4bc0bac1dd4fc3298502e9 (patch)
tree49923bb64af0c598635b9d481f7e1390bf5a5bbb
parent0c7596621e313bfcfbacb288e768c7150f5de9e0 (diff)
downloadconfigs-bad1a753d4d4deb09d4bc0bac1dd4fc3298502e9.tar.gz
x86, x32, ptrace: Remove PTRACE_ARCH_PRCTL for x32
When I added x32 ptrace to 3.4 kernel, I also include PTRACE_ARCH_PRCTL support for x32 GDB For ARCH_GET_FS/GS, it takes a pointer to int64. But at user level, ARCH_GET_FS/GS takes a pointer to int32. So I have to add x32 ptrace to glibc to handle it with a temporary int64 passed to kernel and copy it back to GDB as int32. Roland suggested that PTRACE_ARCH_PRCTL is obsolete and x32 GDB should use fs_base and gs_base fields of user_regs_struct instead. Accordingly, remove PTRACE_ARCH_PRCTL completely from the x32 code to avoid possible memory overrun when pointer to int32 is passed to kernel. Link: http://lkml.kernel.org/r/CAMe9rOpDzHfS7NH7m1vmD9QRw8SSj4Sc%2BaNOgcWm_WJME2eRsQ@mail.gmail.com Signed-off-by: H. Peter Anvin <hpa@zytor.com> Cc: <stable@vger.kernel.org> v3.4
-rw-r--r--arch/x86/kernel/ptrace.c6
1 files changed, 0 insertions, 6 deletions
diff --git a/arch/x86/kernel/ptrace.c b/arch/x86/kernel/ptrace.c
index 13b1990c7c5..c4c6a5c2bf0 100644
--- a/arch/x86/kernel/ptrace.c
+++ b/arch/x86/kernel/ptrace.c
@@ -1211,12 +1211,6 @@ static long x32_arch_ptrace(struct task_struct *child,
0, sizeof(struct user_i387_struct),
datap);
- /* normal 64bit interface to access TLS data.
- Works just like arch_prctl, except that the arguments
- are reversed. */
- case PTRACE_ARCH_PRCTL:
- return do_arch_prctl(child, data, addr);
-
default:
return compat_ptrace_request(child, request, addr, data);
}