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authorJeff Layton <jlayton@redhat.com>2012-12-10 06:10:44 -0500
committerSteve French <smfrench@gmail.com>2012-12-11 11:48:49 -0600
commit193cdd8a293007d1a1ad252cf66b2dc5b793d2d0 (patch)
tree2bfefe36dd1c6ca0d42fc35b00bf323b8d41e5b3 /fs
parent6d8b59d712e95d257ee16f80b579677e5e1bf33c (diff)
downloadlinux-193cdd8a293007d1a1ad252cf66b2dc5b793d2d0.tar.gz
cifs: fix SID binary to string conversion
The authority fields are supposed to be represented by a single 48-bit value. It's also supposed to represent the value as hex if it's equal to or greater than 2^32. This is documented in MS-DTYP, section 2.4.2.1. Also, fix up the max string length to account for this fix. Acked-by: Pavel Shilovsky <piastry@etersoft.ru> Signed-off-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Steve French <smfrench@gmail.com>
Diffstat (limited to 'fs')
-rw-r--r--fs/cifs/cifsacl.c25
-rw-r--r--fs/cifs/cifsacl.h8
2 files changed, 24 insertions, 9 deletions
diff --git a/fs/cifs/cifsacl.c b/fs/cifs/cifsacl.c
index 8dd9212ffef..75c1ee69914 100644
--- a/fs/cifs/cifsacl.c
+++ b/fs/cifs/cifsacl.c
@@ -94,6 +94,7 @@ sid_to_key_str(struct cifs_sid *sidptr, unsigned int type)
int i, len;
unsigned int saval;
char *sidstr, *strptr;
+ unsigned long long id_auth_val;
/* 3 bytes for prefix */
sidstr = kmalloc(3 + SID_STRING_BASE_SIZE +
@@ -107,12 +108,24 @@ sid_to_key_str(struct cifs_sid *sidptr, unsigned int type)
sidptr->revision);
strptr += len;
- for (i = 0; i < NUM_AUTHS; ++i) {
- if (sidptr->authority[i]) {
- len = sprintf(strptr, "-%hhu", sidptr->authority[i]);
- strptr += len;
- }
- }
+ /* The authority field is a single 48-bit number */
+ id_auth_val = (unsigned long long)sidptr->authority[5];
+ id_auth_val |= (unsigned long long)sidptr->authority[4] << 8;
+ id_auth_val |= (unsigned long long)sidptr->authority[3] << 16;
+ id_auth_val |= (unsigned long long)sidptr->authority[2] << 24;
+ id_auth_val |= (unsigned long long)sidptr->authority[1] << 32;
+ id_auth_val |= (unsigned long long)sidptr->authority[0] << 48;
+
+ /*
+ * MS-DTYP states that if the authority is >= 2^32, then it should be
+ * expressed as a hex value.
+ */
+ if (id_auth_val <= UINT_MAX)
+ len = sprintf(strptr, "-%llu", id_auth_val);
+ else
+ len = sprintf(strptr, "-0x%llx", id_auth_val);
+
+ strptr += len;
for (i = 0; i < sidptr->num_subauth; ++i) {
saval = le32_to_cpu(sidptr->sub_auth[i]);
diff --git a/fs/cifs/cifsacl.h b/fs/cifs/cifsacl.h
index a445405f80d..4f388483526 100644
--- a/fs/cifs/cifsacl.h
+++ b/fs/cifs/cifsacl.h
@@ -55,12 +55,14 @@
* u8: max 3 bytes in decimal
* u32: max 10 bytes in decimal
*
- * "S-" + 3 bytes for version field + 4 bytes for each authority field (3 bytes
- * per number + 1 for '-') + NULL terminator.
+ * "S-" + 3 bytes for version field + 15 for authority field + NULL terminator
+ *
+ * For authority field, max is when all 6 values are non-zero and it must be
+ * represented in hex. So "-0x" + 12 hex digits.
*
* Add 11 bytes for each subauthority field (10 bytes each + 1 for '-')
*/
-#define SID_STRING_BASE_SIZE (2 + 3 + (4 * NUM_AUTHS) + 1)
+#define SID_STRING_BASE_SIZE (2 + 3 + 15 + 1)
#define SID_STRING_SUBAUTH_SIZE (11) /* size of a single subauth string */
struct cifs_ntsd {