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authorVincent Li <macli@brc.ubc.ca>2009-09-22 16:45:38 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2009-09-23 07:39:40 -0700
commitcba8aafe1e07dfc8bae5ba78be8e02883bd34d31 (patch)
tree473586963e635921613db5e4ae8ac339ae497a18 /fs
parentfb92a4b068be96799da3748c11cbd69760e44d7b (diff)
downloadlinux-cba8aafe1e07dfc8bae5ba78be8e02883bd34d31.tar.gz
fs/proc/base.c: fix proc_fault_inject_write() input sanity check
Remove obfuscated zero-length input check and return -EINVAL instead of -EIO error to make the error message clear to user. Add whitespace stripping. No functionality changes. The old code: echo 1 > /proc/pid/make-it-fail (ok) echo 1foo > /proc/pid/make-it-fail (-bash: echo: write error: Input/output error) The new code: echo 1 > /proc/pid/make-it-fail (ok) echo 1foo > /proc/pid/make-it-fail (-bash: echo: write error: Invalid argument) This patch is conservative in changes to not breaking existing scripts/applications. Signed-off-by: Vincent Li <macli@brc.ubc.ca> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs')
-rw-r--r--fs/proc/base.c11
1 files changed, 5 insertions, 6 deletions
diff --git a/fs/proc/base.c b/fs/proc/base.c
index 5bc587049b37..837469a96598 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -1187,17 +1187,16 @@ static ssize_t proc_fault_inject_write(struct file * file,
count = sizeof(buffer) - 1;
if (copy_from_user(buffer, buf, count))
return -EFAULT;
- make_it_fail = simple_strtol(buffer, &end, 0);
- if (*end == '\n')
- end++;
+ make_it_fail = simple_strtol(strstrip(buffer), &end, 0);
+ if (*end)
+ return -EINVAL;
task = get_proc_task(file->f_dentry->d_inode);
if (!task)
return -ESRCH;
task->make_it_fail = make_it_fail;
put_task_struct(task);
- if (end - buffer == 0)
- return -EIO;
- return end - buffer;
+
+ return count;
}
static const struct file_operations proc_fault_inject_operations = {