diff options
author | Dan Rosenberg <drosenberg@vsecurity.com> | 2011-07-25 17:11:53 -0700 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@suse.de> | 2011-08-08 10:36:01 -0700 |
commit | ffbe3723f2af0edae78692b24cd50f123e3282be (patch) | |
tree | d0d481a76e9f59b1be48ed6303f9913c6bc9d995 /arch | |
parent | 09940cc53dc87b7c24f4a0639244901944b85e01 (diff) |
xtensa: prevent arbitrary read in ptrace
commit 0d0138ebe24b94065580bd2601f8bb7eb6152f56 upstream.
Prevent an arbitrary kernel read. Check the user pointer with access_ok()
before copying data in.
[akpm@linux-foundation.org: s/EIO/EFAULT/]
Signed-off-by: Dan Rosenberg <drosenberg@vsecurity.com>
Cc: Christian Zankel <chris@zankel.net>
Cc: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'arch')
-rw-r--r-- | arch/xtensa/kernel/ptrace.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/xtensa/kernel/ptrace.c b/arch/xtensa/kernel/ptrace.c index 9486882ef0af..885ebe76e443 100644 --- a/arch/xtensa/kernel/ptrace.c +++ b/arch/xtensa/kernel/ptrace.c @@ -136,6 +136,9 @@ int ptrace_setxregs(struct task_struct *child, void __user *uregs) 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); |