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audit: shorten PATH cap values when zero 

Since the vast majority of files (99.993% on a typical system) have no
fcaps, display "0" instead of the full zero-padded 16 hex digits in the
two PATH record cap_f* fields to save netlink bandwidth and disk space.

Simply changing the format to %x won't work since the value is two (or
possibly more in the future) 32-bit hexadecimal values concatenated and
bits in higher order values will be misrepresented.

Passes audit-testsuite and userspace tools already work fine.
Please see the github issue tracker for more details
https://github.com/linux-audit/audit-kernel/issues/101

Signed-off-by: Richard Guy Briggs <rgb@redhat.com>
Acked-by: Steve Grubb <sgrubb@redhat.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>
This commit is contained in:
Richard Guy Briggs 2018-11-30 16:13:16 -05:00 committed by Paul Moore
parent 2a1fe215e7
commit 9a547c7e57
1 changed files with 6 additions and 4 deletions
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10
kernel/audit.c
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@ -2059,11 +2059,13 @@ void audit_log_cap(struct audit_buffer *ab, char *prefix, kernel_cap_t *cap)
{
int i;
audit_log_format(ab, " %s=", prefix);
CAP_FOR_EACH_U32(i) {
audit_log_format(ab, "%08x",
cap->cap[CAP_LAST_U32 - i]);
if (cap_isclear(*cap)) {
audit_log_format(ab, " %s=0", prefix);
return;
}
audit_log_format(ab, " %s=", prefix);
CAP_FOR_EACH_U32(i)
audit_log_format(ab, "%08x", cap->cap[CAP_LAST_U32 - i]);
}
static void audit_log_fcaps(struct audit_buffer *ab, struct audit_names *name)