lk/linux-kernel-test
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

pagemap: close races with suid execve

Browse Source 
just use mm_for_maps()

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro
2011-02-15 22:04:37 -05:00
parent 26ec3c646e
commit ca6b0bf0e0
2 changed files with 4 additions and 7 deletions
Download Patch File Download Diff File Expand all files Collapse all files

7
fs/proc/task_mmu.c
View File

@@ -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;