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authorSteve French <sfrench@us.ibm.com>2008-04-09 20:55:31 +0000
committerSteve French <sfrench@us.ibm.com>2008-04-09 20:55:31 +0000
commitcce246ee5f3c7f4d3539ea41d13feb7a07859145 (patch)
tree693fe2aa45f3772fba1416cb45ce8b278fd6a06e /fs
parent35028d71116926008f5c19b8fcb00aacaabf5eab (diff)
[CIFS] Fix acl length when very short ACL being modified by chmod
Signed-off-by: Shirish Pargaonkar <shirishp@us.ibm.com> Signed-off-by: Steve French <sfrench@us.ibm.com>
Diffstat (limited to 'fs')
-rw-r--r--fs/cifs/cifsacl.c14
-rw-r--r--fs/cifs/cifsacl.h1
2 files changed, 9 insertions, 6 deletions
diff --git a/fs/cifs/cifsacl.c b/fs/cifs/cifsacl.c
index 1cb5b0a9f2a..e99d4faf5f0 100644
--- a/fs/cifs/cifsacl.c
+++ b/fs/cifs/cifsacl.c
@@ -516,7 +516,7 @@ static int parse_sec_desc(struct cifs_ntsd *pntsd, int acl_len,
/* Convert permission bits from mode to equivalent CIFS ACL */
static int build_sec_desc(struct cifs_ntsd *pntsd, struct cifs_ntsd *pnntsd,
- int acl_len, struct inode *inode, __u64 nmode)
+ struct inode *inode, __u64 nmode)
{
int rc = 0;
__u32 dacloffset;
@@ -692,14 +692,14 @@ void acl_to_uid_mode(struct inode *inode, const char *path, const __u16 *pfid)
int mode_to_acl(struct inode *inode, const char *path, __u64 nmode)
{
int rc = 0;
- __u32 acllen = 0;
+ __u32 secdesclen = 0;
struct cifs_ntsd *pntsd = NULL; /* acl obtained from server */
struct cifs_ntsd *pnntsd = NULL; /* modified acl to be sent to server */
cFYI(DBG2, ("set ACL from mode for %s", path));
/* Get the security descriptor */
- pntsd = get_cifs_acl(&acllen, inode, path, NULL);
+ pntsd = get_cifs_acl(&secdesclen, inode, path, NULL);
/* Add three ACEs for owner, group, everyone getting rid of
other ACEs as chmod disables ACEs and set the security descriptor */
@@ -709,20 +709,22 @@ int mode_to_acl(struct inode *inode, const char *path, __u64 nmode)
set security descriptor request security descriptor
parameters, and secuirty descriptor itself */
- pnntsd = kmalloc(acllen, GFP_KERNEL);
+ secdesclen = secdesclen < DEFSECDESCLEN ?
+ DEFSECDESCLEN : secdesclen;
+ pnntsd = kmalloc(secdesclen, GFP_KERNEL);
if (!pnntsd) {
cERROR(1, ("Unable to allocate security descriptor"));
kfree(pntsd);
return (-ENOMEM);
}
- rc = build_sec_desc(pntsd, pnntsd, acllen, inode, nmode);
+ rc = build_sec_desc(pntsd, pnntsd, inode, nmode);
cFYI(DBG2, ("build_sec_desc rc: %d", rc));
if (!rc) {
/* Set the security descriptor */
- rc = set_cifs_acl(pnntsd, acllen, inode, path);
+ rc = set_cifs_acl(pnntsd, secdesclen, inode, path);
cFYI(DBG2, ("set_cifs_acl rc: %d", rc));
}
diff --git a/fs/cifs/cifsacl.h b/fs/cifs/cifsacl.h
index 93a7c3462ea..6c8096cf515 100644
--- a/fs/cifs/cifsacl.h
+++ b/fs/cifs/cifsacl.h
@@ -27,6 +27,7 @@
#define NUM_SUBAUTHS 5 /* number of sub authority fields */
#define NUM_WK_SIDS 7 /* number of well known sids */
#define SIDNAMELENGTH 20 /* long enough for the ones we care about */
+#define DEFSECDESCLEN 192 /* sec desc len contaiting a dacl with three aces */
#define READ_BIT 0x4
#define WRITE_BIT 0x2