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Commit | Line | Data |
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74d95923 GKH |
1 | From 0d0138ebe24b94065580bd2601f8bb7eb6152f56 Mon Sep 17 00:00:00 2001 |
2 | From: Dan Rosenberg <drosenberg@vsecurity.com> | |
3 | Date: Mon, 25 Jul 2011 17:11:53 -0700 | |
4 | Subject: xtensa: prevent arbitrary read in ptrace | |
5 | ||
6 | From: Dan Rosenberg <drosenberg@vsecurity.com> | |
7 | ||
8 | commit 0d0138ebe24b94065580bd2601f8bb7eb6152f56 upstream. | |
9 | ||
10 | Prevent an arbitrary kernel read. Check the user pointer with access_ok() | |
11 | before copying data in. | |
12 | ||
13 | [akpm@linux-foundation.org: s/EIO/EFAULT/] | |
14 | Signed-off-by: Dan Rosenberg <drosenberg@vsecurity.com> | |
15 | Cc: Christian Zankel <chris@zankel.net> | |
16 | Cc: Oleg Nesterov <oleg@redhat.com> | |
17 | Signed-off-by: Andrew Morton <akpm@linux-foundation.org> | |
18 | Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> | |
19 | Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de> | |
20 | ||
21 | --- | |
22 | arch/xtensa/kernel/ptrace.c | 3 +++ | |
23 | 1 file changed, 3 insertions(+) | |
24 | ||
25 | --- a/arch/xtensa/kernel/ptrace.c | |
26 | +++ b/arch/xtensa/kernel/ptrace.c | |
27 | @@ -147,6 +147,9 @@ int ptrace_setxregs(struct task_struct * | |
28 | elf_xtregs_t *xtregs = uregs; | |
29 | int ret = 0; | |
30 | ||
31 | + if (!access_ok(VERIFY_READ, uregs, sizeof(elf_xtregs_t))) | |
32 | + return -EFAULT; | |
33 | + | |
34 | #if XTENSA_HAVE_COPROCESSORS | |
35 | /* Flush all coprocessors before we overwrite them. */ | |
36 | coprocessor_flush_all(ti); |