diff options
| author | Kay Sievers <kay@vrfy.org> | 2012-07-06 09:50:09 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-07-06 09:50:09 -0700 |
| commit | e3f5a5f27153228569f3396049838e9727dae86e (patch) | |
| tree | 8ae40775f660a5dcca57960fac222096e1dfefed /kernel/printk.c | |
| parent | 5c53d819c71c63fdc91f30a59164583f68e2d63a (diff) | |
| download | lwn-e3f5a5f27153228569f3396049838e9727dae86e.tar.gz lwn-e3f5a5f27153228569f3396049838e9727dae86e.zip | |
kmsg: escape the backslash character while exporting data
Non-printable characters in the log data are hex-escaped to ensure safe
post processing. We need to escape a backslash we find in the data, to be
able to distinguish it from a backslash we add for the escaping.
Also escape the non-printable character 127.
Thanks to Miloslav Trmac for the heads up.
Reported-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Kay Sievers <kay@vrfy.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'kernel/printk.c')
| -rw-r--r-- | kernel/printk.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/kernel/printk.c b/kernel/printk.c index 12886cd19cd9..505863aa3a7f 100644 --- a/kernel/printk.c +++ b/kernel/printk.c @@ -465,7 +465,7 @@ static ssize_t devkmsg_read(struct file *file, char __user *buf, for (i = 0; i < msg->text_len; i++) { unsigned char c = log_text(msg)[i]; - if (c < ' ' || c >= 128) + if (c < ' ' || c >= 127 || c == '\\') len += sprintf(user->buf + len, "\\x%02x", c); else user->buf[len++] = c; @@ -489,7 +489,7 @@ static ssize_t devkmsg_read(struct file *file, char __user *buf, continue; } - if (c < ' ' || c >= 128) { + if (c < ' ' || c >= 127 || c == '\\') { len += sprintf(user->buf + len, "\\x%02x", c); continue; } |