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authorLinus Torvalds <torvalds@linux-foundation.org>2014-12-31 14:52:18 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2014-12-31 14:52:18 -0800
commit5e0f872c7d7e371fbdf09e864eddd24bddfda8fe (patch)
tree4c48140fd3a7131622c0ec454e82870f2cba88c2 /kernel/auditsc.c
parent7f4054836d811c650c51f9c93088f8ebd61b0020 (diff)
parentfcf22d8267ad2601fe9b6c549d1be96401c23e0b (diff)
downloadlinux-sh-5e0f872c7d7e371fbdf09e864eddd24bddfda8fe.tar.gz
Merge branch 'upstream' of git://git.infradead.org/users/pcmoore/audit
Pull audit fix from Paul Moore: "One audit patch to resolve a panic/oops when recording filenames in the audit log, see the mail archive link below. The fix isn't as nice as I would like, as it involves an allocate/copy of the filename, but it solves the problem and the overhead should only affect users who have configured audit rules involving file names. We'll revisit this issue with future kernels in an attempt to make this suck less, but in the meantime I think this fix should go into the next release of v3.19-rcX. [ https://marc.info/?t=141986927600001&r=1&w=2 ]" * 'upstream' of git://git.infradead.org/users/pcmoore/audit: audit: create private file name copies when auditing inodes
Diffstat (limited to 'kernel/auditsc.c')
-rw-r--r--kernel/auditsc.c49
1 files changed, 40 insertions, 9 deletions
diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index 37c69ab561da..072566dd0caf 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -72,6 +72,8 @@
#include <linux/fs_struct.h>
#include <linux/compat.h>
#include <linux/ctype.h>
+#include <linux/string.h>
+#include <uapi/linux/limits.h>
#include "audit.h"
@@ -1861,8 +1863,7 @@ void __audit_inode(struct filename *name, const struct dentry *dentry,
}
list_for_each_entry_reverse(n, &context->names_list, list) {
- /* does the name pointer match? */
- if (!n->name || n->name->name != name->name)
+ if (!n->name || strcmp(n->name->name, name->name))
continue;
/* match the correct record type */
@@ -1881,14 +1882,44 @@ out_alloc:
n = audit_alloc_name(context, AUDIT_TYPE_UNKNOWN);
if (!n)
return;
- if (name)
- /* since name is not NULL we know there is already a matching
- * name record, see audit_getname(), so there must be a type
- * mismatch; reuse the string path since the original name
- * record will keep the string valid until we free it in
- * audit_free_names() */
- n->name = name;
+ /* unfortunately, while we may have a path name to record with the
+ * inode, we can't always rely on the string lasting until the end of
+ * the syscall so we need to create our own copy, it may fail due to
+ * memory allocation issues, but we do our best */
+ if (name) {
+ /* we can't use getname_kernel() due to size limits */
+ size_t len = strlen(name->name) + 1;
+ struct filename *new = __getname();
+
+ if (unlikely(!new))
+ goto out;
+
+ if (len <= (PATH_MAX - sizeof(*new))) {
+ new->name = (char *)(new) + sizeof(*new);
+ new->separate = false;
+ } else if (len <= PATH_MAX) {
+ /* this looks odd, but is due to final_putname() */
+ struct filename *new2;
+ new2 = kmalloc(sizeof(*new2), GFP_KERNEL);
+ if (unlikely(!new2)) {
+ __putname(new);
+ goto out;
+ }
+ new2->name = (char *)new;
+ new2->separate = true;
+ new = new2;
+ } else {
+ /* we should never get here, but let's be safe */
+ __putname(new);
+ goto out;
+ }
+ strlcpy((char *)new->name, name->name, len);
+ new->uptr = NULL;
+ new->aname = n;
+ n->name = new;
+ n->name_put = true;
+ }
out:
if (parent) {
n->name_len = n->name ? parent_len(n->name->name) : AUDIT_NAME_FULL;