The patch titled
Subject: prctl: return -EFAULT on auxv fetching failure
has been added to the -mm tree. Its filename is
prctl-pr_set_mm-introduce-pr_set_mm_map-operation-v4-fix-2.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/prctl-pr_set_mm-introduce-pr_set_mm_map-operation-v4-fix-2.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/prctl-pr_set_mm-introduce-pr_set_mm_map-operation-v4-fix-2.patch
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------------------------------------------------------
From: Cyrill Gorcunov <gorcunov@xxxxxxxxx>
Subject: prctl: return -EFAULT on auxv fetching failure
Dan reported that returning bytes left if copy_from_user failed
is a bad option, return traditional -EFAULT instead.
Signed-off-by: Cyrill Gorcunov <gorcunov@xxxxxxxxx>
Reported-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
kernel/sys.c | 9 ++++-----
1 file changed, 4 insertions(+), 5 deletions(-)
diff -puN kernel/sys.c~prctl-pr_set_mm-introduce-pr_set_mm_map-operation-v4-fix-2 kernel/sys.c
--- a/kernel/sys.c~prctl-pr_set_mm-introduce-pr_set_mm_map-operation-v4-fix-2
+++ a/kernel/sys.c
@@ -1809,11 +1809,10 @@ static int prctl_set_mm_map(int opt, con
if (prctl_map.auxv_size) {
memset(user_auxv, 0, sizeof(user_auxv));
- error = copy_from_user(user_auxv,
- (const void __user *)prctl_map.auxv,
- prctl_map.auxv_size);
- if (error)
- return error;
+ if (copy_from_user(user_auxv,
+ (const void __user *)prctl_map.auxv,
+ prctl_map.auxv_size))
+ return -EFAULT;
/* Last entry must be AT_NULL as specification requires */
user_auxv[AT_VECTOR_SIZE - 2] = AT_NULL;
_
Patches currently in -mm which might be from gorcunov@xxxxxxxxx are
x86mm-fix-pte_special-versus-pte_numa.patch
mm-remove-misleading-arch_uses_numa_prot_none.patch
prctl-pr_set_mm-introduce-pr_set_mm_map-operation-v4.patch
prctl-pr_set_mm-introduce-pr_set_mm_map-operation-v4-fix.patch
prctl-pr_set_mm-introduce-pr_set_mm_map-operation-v4-fix-2.patch
ipc-shm-kill-the-historical-wrong-mm-start_stack-check.patch
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