diff options
Diffstat (limited to 'drivers/tty/sysrq.c')
| -rw-r--r-- | drivers/tty/sysrq.c | 19 |
1 files changed, 16 insertions, 3 deletions
diff --git a/drivers/tty/sysrq.c b/drivers/tty/sysrq.c index 6b4a28bcf2f5..02217e3c916b 100644 --- a/drivers/tty/sysrq.c +++ b/drivers/tty/sysrq.c @@ -1150,16 +1150,29 @@ EXPORT_SYMBOL(unregister_sysrq_key); #ifdef CONFIG_PROC_FS /* * writing 'C' to /proc/sysrq-trigger is like sysrq-C + * Normally, only the first character written is processed. + * However, if the first character is an underscore, + * all characters are processed. */ static ssize_t write_sysrq_trigger(struct file *file, const char __user *buf, size_t count, loff_t *ppos) { - if (count) { + bool bulk = false; + size_t i; + + for (i = 0; i < count; i++) { char c; - if (get_user(c, buf)) + if (get_user(c, buf + i)) return -EFAULT; - __handle_sysrq(c, false); + + if (c == '_') + bulk = true; + else + __handle_sysrq(c, false); + + if (!bulk) + break; } return count; |