From: Ondrej Mosnacek <omosnace@redhat.com>
To: selinux@vger.kernel.org, Paul Moore <paul@paul-moore.com>
Cc: Stephen Smalley <sds@tycho.nsa.gov>,
Kent Overstreet <kent.overstreet@gmail.com>,
Andrew Morton <akpm@linux-foundation.org>,
linux-kernel@vger.kernel.org,
Ondrej Mosnacek <omosnace@redhat.com>,
syzbot+a57b2aff60832666fc28@syzkaller.appspotmail.com
Subject: [PATCH] selinux: fix NULL dereference in policydb_destroy()
Date: Sun, 17 Mar 2019 14:46:53 +0100 [thread overview]
Message-ID: <20190317134653.26824-1-omosnace@redhat.com> (raw)
The conversion to kvmalloc() forgot to account for the possibility that
p->type_attr_map_array might be null in policydb_destroy().
Fix this by destroying its contents only if it is not NULL.
Also make sure ebitmap_init() is called on all entries before
policydb_destroy() can be called. Right now this is a no-op, because
both kvcalloc() and ebitmap_init() just zero out the whole struct, but
let's rather not rely on a specific implementation.
Reported-by: syzbot+a57b2aff60832666fc28@syzkaller.appspotmail.com
Fixes: acdf52d97f82 ("selinux: convert to kvmalloc")
Signed-off-by: Ondrej Mosnacek <omosnace@redhat.com>
---
security/selinux/ss/policydb.c | 13 +++++++++----
1 file changed, 9 insertions(+), 4 deletions(-)
NOTE: This applies directly on top of current Linus' tree, since the
problematic commit is not present in the selinux/stable-5.1 branch.
diff --git a/security/selinux/ss/policydb.c b/security/selinux/ss/policydb.c
index 6b576e588725..daecdfb15a9c 100644
--- a/security/selinux/ss/policydb.c
+++ b/security/selinux/ss/policydb.c
@@ -828,9 +828,11 @@ void policydb_destroy(struct policydb *p)
hashtab_map(p->range_tr, range_tr_destroy, NULL);
hashtab_destroy(p->range_tr);
- for (i = 0; i < p->p_types.nprim; i++)
- ebitmap_destroy(&p->type_attr_map_array[i]);
- kvfree(p->type_attr_map_array);
+ if (p->type_attr_map_array) {
+ for (i = 0; i < p->p_types.nprim; i++)
+ ebitmap_destroy(&p->type_attr_map_array[i]);
+ kvfree(p->type_attr_map_array);
+ }
ebitmap_destroy(&p->filename_trans_ttypes);
ebitmap_destroy(&p->policycaps);
@@ -2496,10 +2498,13 @@ int policydb_read(struct policydb *p, void *fp)
if (!p->type_attr_map_array)
goto bad;
+ /* just in case ebitmap_init() becomes more than just a memset(0): */
+ for (i = 0; i < p->p_types.nprim; i++)
+ ebitmap_init(&p->type_attr_map_array[i]);
+
for (i = 0; i < p->p_types.nprim; i++) {
struct ebitmap *e = &p->type_attr_map_array[i];
- ebitmap_init(e);
if (p->policyvers >= POLICYDB_VERSION_AVTAB) {
rc = ebitmap_read(e, fp);
if (rc)
--
2.20.1
next reply other threads:[~2019-03-17 13:47 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-03-17 13:46 Ondrej Mosnacek [this message]
2019-03-18 13:42 ` [PATCH] selinux: fix NULL dereference in policydb_destroy() Stephen Smalley
2019-03-18 16:29 ` Paul Moore
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