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| author | Miloslav Trmac <mitr@redhat.com> | 2009-03-19 09:52:47 -0400 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2009-04-05 13:43:36 -0400 |
| commit | 55ad2f8d340678397de5916b9cd960f17ebd7150 (patch) | |
| tree | 6df2974acdd023948fda996119ff94a3eaf6ab5d /kernel/audit.c | |
| parent | b3897f567100d18e0597f638b911d23aa5e0dd23 (diff) | |
| download | lwn-55ad2f8d340678397de5916b9cd960f17ebd7150.tar.gz lwn-55ad2f8d340678397de5916b9cd960f17ebd7150.zip | |
audit: ignore terminating NUL in AUDIT_USER_TTY messages
AUDIT_USER_TTY, like all other messages sent from user-space, is sent
NUL-terminated. Unlike other user-space audit messages, which come only
from trusted sources, AUDIT_USER_TTY messages are processed using
audit_log_n_untrustedstring().
This patch modifies AUDIT_USER_TTY handling to ignore the trailing NUL
and use the "quoted_string" representation of the message if possible.
Signed-off-by: Miloslav Trmac <mitr@redhat.com>
Cc: Eric Paris <eparis@redhat.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Steve Grubb <sgrubb@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'kernel/audit.c')
| -rw-r--r-- | kernel/audit.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/kernel/audit.c b/kernel/audit.c index fa3805516dff..5560390cb0f5 100644 --- a/kernel/audit.c +++ b/kernel/audit.c @@ -766,6 +766,9 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh) audit_log_format(ab, " msg="); size = nlmsg_len(nlh); + if (size > 0 && + ((unsigned char *)data)[size - 1] == '\0') + size--; audit_log_n_untrustedstring(ab, data, size); } audit_set_pid(ab, pid); |