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authorAl Viro <viro@zeniv.linux.org.uk>2011-02-15 22:04:37 -0500
committerAl Viro <viro@zeniv.linux.org.uk>2011-03-23 16:36:50 -0400
commitca6b0bf0e086513b9ee5efc0aa5770ecb57778af (patch)
tree4fec50b38253288746ac4b4ea6d4bf5216b0c53b /fs/proc/task_mmu.c
parent26ec3c646e75ce7a69fda429d68fcbdcd5eacc62 (diff)
downloadlinux-ca6b0bf0e086513b9ee5efc0aa5770ecb57778af.tar.bz2
pagemap: close races with suid execve
just use mm_for_maps() Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/proc/task_mmu.c')
-rw-r--r--fs/proc/task_mmu.c7
1 files changed, 2 insertions, 5 deletions
diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
index 60b914860f81..c966413c139b 100644
--- a/fs/proc/task_mmu.c
+++ b/fs/proc/task_mmu.c
@@ -729,7 +729,8 @@ static ssize_t pagemap_read(struct file *file, char __user *buf,
goto out;
ret = -EACCES;
- if (!ptrace_may_access(task, PTRACE_MODE_READ))
+ mm = mm_for_maps(task);
+ if (!mm)
goto out_task;
ret = -EINVAL;
@@ -742,10 +743,6 @@ static ssize_t pagemap_read(struct file *file, char __user *buf,
if (!count)
goto out_task;
- mm = get_task_mm(task);
- if (!mm)
- goto out_task;
-
pm.len = PM_ENTRY_BYTES * (PAGEMAP_WALK_SIZE >> PAGE_SHIFT);
pm.buffer = kmalloc(pm.len, GFP_TEMPORARY);
ret = -ENOMEM;