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| author | KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> | 2009-09-21 17:03:16 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-09-22 07:17:39 -0700 |
| commit | 5d863b89688e5811cd9e5bd0082cb38abe03adf3 (patch) | |
| tree | 6041584a854fc70cd497843f134e2cf983741230 /fs/proc | |
| parent | 8c5cd6f3a1721085652da204d454af4f8b92eda2 (diff) | |
| download | linux-5d863b89688e5811cd9e5bd0082cb38abe03adf3.tar.gz linux-5d863b89688e5811cd9e5bd0082cb38abe03adf3.tar.bz2 linux-5d863b89688e5811cd9e5bd0082cb38abe03adf3.zip | |
oom: fix oom_adjust_write() input sanity check
Andrew Morton pointed out oom_adjust_write() has very strange EIO
and new line handling. this patch fixes it.
Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Paul Menage <menage@google.com>
Cc: David Rientjes <rientjes@google.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/proc')
| -rw-r--r-- | fs/proc/base.c | 18 |
1 files changed, 10 insertions, 8 deletions
diff --git a/fs/proc/base.c b/fs/proc/base.c index 71a34253dcbb..55c4c805a756 100644 --- a/fs/proc/base.c +++ b/fs/proc/base.c @@ -1021,21 +1021,24 @@ static ssize_t oom_adjust_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) { struct task_struct *task; - char buffer[PROC_NUMBUF], *end; - int oom_adjust; + char buffer[PROC_NUMBUF]; + long oom_adjust; unsigned long flags; + int err; memset(buffer, 0, sizeof(buffer)); if (count > sizeof(buffer) - 1) count = sizeof(buffer) - 1; if (copy_from_user(buffer, buf, count)) return -EFAULT; - oom_adjust = simple_strtol(buffer, &end, 0); + + err = strict_strtol(strstrip(buffer), 0, &oom_adjust); + if (err) + return -EINVAL; if ((oom_adjust < OOM_ADJUST_MIN || oom_adjust > OOM_ADJUST_MAX) && oom_adjust != OOM_DISABLE) return -EINVAL; - if (*end == '\n') - end++; + task = get_proc_task(file->f_path.dentry->d_inode); if (!task) return -ESRCH; @@ -1054,9 +1057,8 @@ static ssize_t oom_adjust_write(struct file *file, const char __user *buf, unlock_task_sighand(task, &flags); put_task_struct(task); - if (end - buffer == 0) - return -EIO; - return end - buffer; + + return count; } static const struct file_operations proc_oom_adjust_operations = { |