This is a note to let you know that I've just added the patch titled
xtensa: prevent arbitrary read in ptrace
to the 2.6.33-longterm tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/longterm/longterm-queue-2.6.33.git;a=summary
The filename of the patch is:
xtensa-prevent-arbitrary-read-in-ptrace.patch
and it can be found in the queue-2.6.33 subdirectory.
If you, or anyone else, feels it should not be added to the 2.6.33 longterm
tree,
please let <[email protected]> know about it.
>From 0d0138ebe24b94065580bd2601f8bb7eb6152f56 Mon Sep 17 00:00:00 2001
From: Dan Rosenberg <[email protected]>
Date: Mon, 25 Jul 2011 17:11:53 -0700
Subject: xtensa: prevent arbitrary read in ptrace
From: Dan Rosenberg <[email protected]>
commit 0d0138ebe24b94065580bd2601f8bb7eb6152f56 upstream.
Prevent an arbitrary kernel read. Check the user pointer with access_ok()
before copying data in.
[[email protected]: s/EIO/EFAULT/]
Signed-off-by: Dan Rosenberg <[email protected]>
Cc: Christian Zankel <[email protected]>
Cc: Oleg Nesterov <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
arch/xtensa/kernel/ptrace.c | 3 +++
1 file changed, 3 insertions(+)
--- a/arch/xtensa/kernel/ptrace.c
+++ b/arch/xtensa/kernel/ptrace.c
@@ -136,6 +136,9 @@ int ptrace_setxregs(struct task_struct *
elf_xtregs_t *xtregs = uregs;
int ret = 0;
+ if (!access_ok(VERIFY_READ, uregs, sizeof(elf_xtregs_t)))
+ return -EFAULT;
+
#if XTENSA_HAVE_COPROCESSORS
/* Flush all coprocessors before we overwrite them. */
coprocessor_flush_all(ti);
Patches currently in longterm-queue-2.6.33 which might be from
[email protected] are
/home/gregkh/linux/longterm/longterm-queue-2.6.33/queue-2.6.33/pmcraid-reject-negative-request-size.patch
/home/gregkh/linux/longterm/longterm-queue-2.6.33/queue-2.6.33/xtensa-prevent-arbitrary-read-in-ptrace.patch
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