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| author | Vincent Li <macli@brc.ubc.ca> | 2009-09-23 01:45:38 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-09-23 16:39:40 +0200 |
| commit | cba8aafe1e07dfc8bae5ba78be8e02883bd34d31 (patch) | |
| tree | 473586963e635921613db5e4ae8ac339ae497a18 | |
| parent | fs/proc/task_mmu.c v1: fix clear_refs_write() input sanity check (diff) | |
| download | linux-cba8aafe1e07dfc8bae5ba78be8e02883bd34d31.tar.xz linux-cba8aafe1e07dfc8bae5ba78be8e02883bd34d31.zip | |
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>
| -rw-r--r-- | fs/proc/base.c | 11 |
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 = { |