This is a note to let you know that I've just added the patch titled
x86, x32, ptrace: Remove PTRACE_ARCH_PRCTL for x32
to the 3.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
x86-x32-ptrace-remove-ptrace_arch_prctl-for-x32.patch
and it can be found in the queue-3.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.
>From bad1a753d4d4deb09d4bc0bac1dd4fc3298502e9 Mon Sep 17 00:00:00 2001
From: "H.J. Lu" <hjl.to...@gmail.com>
Date: Mon, 21 May 2012 20:29:45 -0700
Subject: x86, x32, ptrace: Remove PTRACE_ARCH_PRCTL for x32
From: "H.J. Lu" <hjl.to...@gmail.com>
commit bad1a753d4d4deb09d4bc0bac1dd4fc3298502e9 upstream.
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is obsolete and x32 GDB should use fs_base and gs_base fields of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_wjme2e...@mail.gmail.com
Signed-off-by: H. Peter Anvin <h...@zytor.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
arch/x86/kernel/ptrace.c | 6 ------
1 file changed, 6 deletions(-)
--- a/arch/x86/kernel/ptrace.c
+++ b/arch/x86/kernel/ptrace.c
@@ -1211,12 +1211,6 @@ static long x32_arch_ptrace(struct task_
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);
}
Patches currently in stable-queue which might be from hjl.to...@gmail.com are
queue-3.4/x86-x32-ptrace-remove-ptrace_arch_prctl-for-x32.patch
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