# HG changeset patch
# User Keir Fraser <keir.fraser@xxxxxxxxxx>
# Date 1250266092 -3600
# Node ID ef3209bb506342d23eae2131defe7d4f8b94df55
# Parent 64da4ed2be34f05d1a101aefcbeb3801d076c30d
xsm/flask: Fix sidtab locking bug
We do not need to use the _irqsave/irqrestore forms of spin locking
within the sidtab in Xen's XSM Flask module, and doing so triggers a
BUG_ON() within check_lock() when we subsequently call xmalloc().
This was preventing Xen from booting with XSM/Flask enabled if built
with debug=y. It appears that this broke upon the changes to xmalloc
in changeset 18379:14a9a1629590.
Signed-off-by: Stephen D. Smalley <sds@xxxxxxxxxxxxx>
Signed-off-by: George S. Coker, II <gscoker@xxxxxxxxxxxxxx>
---
xen/xsm/flask/ss/sidtab.c | 23 +++++++++--------------
1 files changed, 9 insertions(+), 14 deletions(-)
diff -r 64da4ed2be34 -r ef3209bb5063 xen/xsm/flask/ss/sidtab.c
--- a/xen/xsm/flask/ss/sidtab.c Fri Aug 14 17:07:23 2009 +0100
+++ b/xen/xsm/flask/ss/sidtab.c Fri Aug 14 17:08:12 2009 +0100
@@ -17,8 +17,8 @@
#define SIDTAB_HASH(sid) (sid & SIDTAB_HASH_MASK)
#define INIT_SIDTAB_LOCK(s) spin_lock_init(&s->lock)
-#define SIDTAB_LOCK(s, x) spin_lock_irqsave(&s->lock, x)
-#define SIDTAB_UNLOCK(s, x) spin_unlock_irqrestore(&s->lock, x)
+#define SIDTAB_LOCK(s) spin_lock(&s->lock)
+#define SIDTAB_UNLOCK(s) spin_unlock(&s->lock)
int sidtab_init(struct sidtab *s)
{
@@ -216,14 +216,13 @@ int sidtab_context_to_sid(struct sidtab
{
u32 sid;
int ret = 0;
- unsigned long flags;
*out_sid = SECSID_NULL;
sid = sidtab_search_context(s, context);
if ( !sid )
{
- SIDTAB_LOCK(s, flags);
+ SIDTAB_LOCK(s);
/* Rescan now that we hold the lock. */
sid = sidtab_search_context(s, context);
if ( sid )
@@ -239,7 +238,7 @@ int sidtab_context_to_sid(struct sidtab
if ( ret )
s->next_sid--;
unlock_out:
- SIDTAB_UNLOCK(s, flags);
+ SIDTAB_UNLOCK(s);
}
if ( ret )
@@ -307,21 +306,17 @@ void sidtab_destroy(struct sidtab *s)
void sidtab_set(struct sidtab *dst, struct sidtab *src)
{
- unsigned long flags;
-
- SIDTAB_LOCK(src, flags);
+ SIDTAB_LOCK(src);
dst->htable = src->htable;
dst->nel = src->nel;
dst->next_sid = src->next_sid;
dst->shutdown = 0;
- SIDTAB_UNLOCK(src, flags);
+ SIDTAB_UNLOCK(src);
}
void sidtab_shutdown(struct sidtab *s)
{
- unsigned long flags;
-
- SIDTAB_LOCK(s, flags);
+ SIDTAB_LOCK(s);
s->shutdown = 1;
- SIDTAB_UNLOCK(s, flags);
-}
+ SIDTAB_UNLOCK(s);
+}
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