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LSM: shrink sizeof LSM specific portion of common_audit_data

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Linus found that the gigantic size of the common audit data caused a big
perf hit on something as simple as running stat() in a loop.  This patch
requires LSMs to declare the LSM specific portion separately rather than
doing it in a union.  Thus each LSM can be responsible for shrinking their
portion and don't have to pay a penalty just because other LSMs have a
bigger space requirement.

Signed-off-by: Eric Paris <eparis@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Eric Paris 2012-04-03 09:37:02 -07:00 • committed by Linus Torvalds
parent 95694129b4
commit 3b3b0e4fc1
16 changed files with 241 additions and 146 deletions
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4
security/apparmor/lib.c
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@ -65,8 +65,10 @@ void aa_info_message(const char *str)
{
if (audit_enabled) {
struct common_audit_data sa;
struct apparmor_audit_data aad = {0,};
COMMON_AUDIT_DATA_INIT(&sa, NONE);
sa.aad.info = str;
sa.aad = &aad;
aad.info = str;
aa_audit_msg(AUDIT_APPARMOR_STATUS, &sa, NULL);
}
printk(KERN_INFO "AppArmor: %s\n", str);