@@ -1268,6 +1268,7 @@ static int
echo_copyout_lsm(struct lov_stripe_md *lsm, void *_ulsm, int ulsm_nob)
{
struct lov_stripe_md *ulsm = _ulsm;
+ struct lov_oinfo **p;
int nob, i;
nob = offsetof(struct lov_stripe_md, lsm_oinfo[lsm->lsm_stripe_count]);
@@ -1277,9 +1278,10 @@ echo_copyout_lsm(struct lov_stripe_md *lsm, void *_ulsm, int ulsm_nob)
if (copy_to_user(ulsm, lsm, sizeof(*ulsm)))
return -EFAULT;
- for (i = 0; i < lsm->lsm_stripe_count; i++) {
- if (copy_to_user(ulsm->lsm_oinfo[i], lsm->lsm_oinfo[i],
- sizeof(lsm->lsm_oinfo[0])))
+ for (i = 0, p = lsm->lsm_oinfo; i < lsm->lsm_stripe_count; i++, p++) {
+ struct lov_oinfo __user *up;
+ if (get_user(up, ulsm->lsm_oinfo + i) ||
+ copy_to_user(up, *p, sizeof(struct lov_oinfo)))
return -EFAULT;
}
return 0;
@@ -1287,9 +1289,10 @@ echo_copyout_lsm(struct lov_stripe_md *lsm, void *_ulsm, int ulsm_nob)
static int
echo_copyin_lsm(struct echo_device *ed, struct lov_stripe_md *lsm,
- void *ulsm, int ulsm_nob)
+ struct lov_stripe_md __user *ulsm, int ulsm_nob)
{
struct echo_client_obd *ec = ed->ed_ec;
+ struct lov_oinfo **p;
int i;
if (ulsm_nob < sizeof(*lsm))
@@ -1304,12 +1307,10 @@ echo_copyin_lsm(struct echo_device *ed, struct lov_stripe_md *lsm,
((__u64)lsm->lsm_stripe_size * lsm->lsm_stripe_count > ~0UL))
return -EINVAL;
-
- for (i = 0; i < lsm->lsm_stripe_count; i++) {
- if (copy_from_user(lsm->lsm_oinfo[i],
- ((struct lov_stripe_md *)ulsm)-> \
- lsm_oinfo[i],
- sizeof(lsm->lsm_oinfo[0])))
+ for (i = 0, p = lsm->lsm_oinfo; i < lsm->lsm_stripe_count; i++, p++) {
+ struct lov_oinfo __user *up;
+ if (get_user(up, ulsm->lsm_oinfo + i) ||
+ copy_from_user(*p, up, sizeof(struct lov_oinfo)))
return -EFAULT;
}
return 0;
This is a note to let you know that I have just added a patch titled staging: lustre: echo_copy.._lsm() dereferences userland pointers directly to the linux-4.2.y-queue branch of the 4.2.y-ckt extended stable tree which can be found at: http://kernel.ubuntu.com/git/ubuntu/linux.git/log/?h=linux-4.2.y-queue This patch is scheduled to be released in version 4.2.8-ckt2. If you, or anyone else, feels it should not be added to this tree, please reply to this email. For more information about the 4.2.y-ckt tree, see https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable Thanks. -Kamal ---8<------------------------------------------------------------ From 8b68dd443db10c360ecfbb18cd4966917f675ba1 Mon Sep 17 00:00:00 2001 From: Al Viro <viro@ZenIV.linux.org.uk> Date: Tue, 1 Dec 2015 19:52:12 +0000 Subject: staging: lustre: echo_copy.._lsm() dereferences userland pointers directly commit 9225c0b7b976dd9ceac2b80727a60d8fcb906a62 upstream. missing get_user() Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Kamal Mostafa <kamal@canonical.com> --- drivers/staging/lustre/lustre/obdecho/echo_client.c | 21 +++++++++++---------- 1 file changed, 11 insertions(+), 10 deletions(-) -- 1.9.1