diff options
| author | Mathias Krause <minipli@googlemail.com> | 2013-07-03 15:05:39 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2013-07-03 16:07:46 -0700 |
| commit | 10fb46d5f79147620d0afda7d3d51302a1e38191 (patch) | |
| tree | b8f6aa6f5c53b9166521bb66e6a8886014889448 | |
| parent | ca75b4d8799d46842350596fdc5fce7711610326 (diff) | |
kprobes: handle empty/invalid input to debugfs "enabled" file
When writing invalid input to 'debug/kprobes/enabled' it'll silently be
ignored. Even worse, when writing an empty string to this file, the
outcome is purely random as the switch statement will make its decision
based on the value of an uninitialized stack variable.
Fix this by handling invalid/empty input as error returning -EINVAL.
Signed-off-by: Mathias Krause <minipli@googlemail.com>
Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
Cc: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | kernel/kprobes.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/kernel/kprobes.c b/kernel/kprobes.c index bddf3b201a4..6e33498d665 100644 --- a/kernel/kprobes.c +++ b/kernel/kprobes.c @@ -2332,6 +2332,7 @@ static ssize_t write_enabled_file_bool(struct file *file, if (copy_from_user(buf, user_buf, buf_size)) return -EFAULT; + buf[buf_size] = '\0'; switch (buf[0]) { case 'y': case 'Y': @@ -2343,6 +2344,8 @@ static ssize_t write_enabled_file_bool(struct file *file, case '0': disarm_all_kprobes(); break; + default: + return -EINVAL; } return count; |