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Subject[PATCH 3.18 114/124] mm/mempolicy.c: fix error handling in set_mempolicy and mbind.
Date
3.18-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Chris Salls <salls@cs.ucsb.edu>

commit cf01fb9985e8deb25ccf0ea54d916b8871ae0e62 upstream.

In the case that compat_get_bitmap fails we do not want to copy the
bitmap to the user as it will contain uninitialized stack data and leak
sensitive data.

Signed-off-by: Chris Salls <salls@cs.ucsb.edu>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
mm/mempolicy.c | 20 ++++++++------------
1 file changed, 8 insertions(+), 12 deletions(-)

--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -1546,7 +1546,6 @@ COMPAT_SYSCALL_DEFINE5(get_mempolicy, in
COMPAT_SYSCALL_DEFINE3(set_mempolicy, int, mode, compat_ulong_t __user *, nmask,
compat_ulong_t, maxnode)
{
- long err = 0;
unsigned long __user *nm = NULL;
unsigned long nr_bits, alloc_size;
DECLARE_BITMAP(bm, MAX_NUMNODES);
@@ -1555,14 +1554,13 @@ COMPAT_SYSCALL_DEFINE3(set_mempolicy, in
alloc_size = ALIGN(nr_bits, BITS_PER_LONG) / 8;

if (nmask) {
- err = compat_get_bitmap(bm, nmask, nr_bits);
+ if (compat_get_bitmap(bm, nmask, nr_bits))
+ return -EFAULT;
nm = compat_alloc_user_space(alloc_size);
- err |= copy_to_user(nm, bm, alloc_size);
+ if (copy_to_user(nm, bm, alloc_size))
+ return -EFAULT;
}

- if (err)
- return -EFAULT;
-
return sys_set_mempolicy(mode, nm, nr_bits+1);
}

@@ -1570,7 +1568,6 @@ COMPAT_SYSCALL_DEFINE6(mbind, compat_ulo
compat_ulong_t, mode, compat_ulong_t __user *, nmask,
compat_ulong_t, maxnode, compat_ulong_t, flags)
{
- long err = 0;
unsigned long __user *nm = NULL;
unsigned long nr_bits, alloc_size;
nodemask_t bm;
@@ -1579,14 +1576,13 @@ COMPAT_SYSCALL_DEFINE6(mbind, compat_ulo
alloc_size = ALIGN(nr_bits, BITS_PER_LONG) / 8;

if (nmask) {
- err = compat_get_bitmap(nodes_addr(bm), nmask, nr_bits);
+ if (compat_get_bitmap(nodes_addr(bm), nmask, nr_bits))
+ return -EFAULT;
nm = compat_alloc_user_space(alloc_size);
- err |= copy_to_user(nm, nodes_addr(bm), alloc_size);
+ if (copy_to_user(nm, nodes_addr(bm), alloc_size))
+ return -EFAULT;
}

- if (err)
- return -EFAULT;
-
return sys_mbind(start, len, mode, nm, nr_bits+1, flags);
}


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