regset: Prevent null pointer reference on readonly regsets
 

From: "H. Peter Anvin" <hpa@zytor.com>

The regset common infrastructure assumed that regsets would always
have .get and .set methods, but not necessarily .active methods.
Unfortunately people have since written regsets without .set methods.

Rather than putting in stub functions everywhere, handle regsets with
null .get or .set methods explicitly.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Reviewed-by: Oleg Nesterov <oleg@redhat.com>
Acked-by: Roland McGrath <roland@hack.frob.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

(cherry picked from commit c8e252586f8d5de906385d8cf6385fee289a825e)
CVE-2012-1097
BugLink: http://bugs.launchpad.net/bugs/949905
Signed-off-by: Andy Whitcroft <apw@canonical.com>
---
fs/binfmt_elf.c | 2 +-
include/linux/regset.h | 6 ++++++
2 files changed, 7 insertions(+), 1 deletions(-)

diff --git a/fs/binfmt_elf.c b/fs/binfmt_elf.c
index 5ba4a56..a13983b 100644
--- a/fs/binfmt_elf.c
+++ b/fs/binfmt_elf.c
@@ -1460,7 +1460,7 @@ static int fill_thread_core_info(struct elf_thread_core_info *t,
for (i = 1; i < view->n; ++i) {
const struct user_regset *regset = &view->regsets[i];
do_thread_regset_writeback(t->task, regset);
- if (regset->core_note_type &&
+ if (regset->core_note_type && regset->get &&
(!regset->active || regset->active(t->task, regset))) {
int ret;
size_t size = regset->n * regset->size;
diff --git a/include/linux/regset.h b/include/linux/regset.h
index 8abee65..5150fd1 100644
--- a/include/linux/regset.h
+++ b/include/linux/regset.h
@@ -335,6 +335,9 @@ static inline int copy_regset_to_user(struct task_struct *target,
{
const struct user_regset *regset = &view->regsets[setno];

+ if (!regset->get)
+ return -EOPNOTSUPP;
+
if (!access_ok(VERIFY_WRITE, data, size))
return -EIO;

@@ -358,6 +361,9 @@ static inline int copy_regset_from_user(struct task_struct *target,
{
const struct user_regset *regset = &view->regsets[setno];

+ if (!regset->set)
+ return -EOPNOTSUPP;
+
if (!access_ok(VERIFY_READ, data, size))
return -EIO;

--
1.7.9


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