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mm/mempolicy.c: fix error handling in set_mempolicy and mbind.

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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.
Change-Id: I4f66a1c3ef7e616d06d3301b145973ed8cd9e449
Signed-off-by: Chris Salls <salls@cs.ucsb.edu>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Git-commit: cf01fb9985e8deb25ccf0ea54d916b8871ae0e62
Git-repo:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
Signed-off-by: Arun KS <arunks@codeaurora.org>
This commit is contained in:
Chris Salls 2017-10-13 13:13:46 +05:30 committed by Gerrit - the friendly Code Review server
parent 96d648a19c
commit 79d2d86fa9
1 changed files with 8 additions and 12 deletions
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20
mm/mempolicy.c
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@ -1537,7 +1537,6 @@ asmlinkage long compat_sys_get_mempolicy(int __user *policy,
asmlinkage long compat_sys_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);
@ -1546,14 +1545,13 @@ asmlinkage long compat_sys_set_mempolicy(int mode, compat_ulong_t __user *nmask,
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);
}
@ -1561,7 +1559,6 @@ asmlinkage long compat_sys_mbind(compat_ulong_t start, compat_ulong_t len,
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;
@ -1570,14 +1567,13 @@ asmlinkage long compat_sys_mbind(compat_ulong_t start, compat_ulong_t len,
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);
}