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Commit 7ee0b4c6 authored by Jeff Layton's avatar Jeff Layton Committed by Steve French
Browse files

cifs: fix hardcoded default security descriptor length 



It was hardcoded to 192 bytes, which was not enough when the max number
of subauthorities went to 15. Redefine this constant in terms of sizeof
the structs involved, and rename it for better clarity.

While we're at it, remove a couple more unused constants from cifsacl.h.

Reviewed-by: default avatarShirish Pargaonkar <shirishpargaonkar@gmail.com>
Signed-off-by: default avatarJeff Layton <jlayton@redhat.com>
Signed-off-by: default avatarSteve French <smfrench@gmail.com>
parent 2ae03025

fs/cifs/cifsacl.c

+1 −1
Original line number Diff line number Diff line
@@ -1008,7 +1008,7 @@ id_mode_to_cifs_acl(struct inode *inode, const char *path, __u64 nmode, 
	 * memory for the smb header, set security descriptor request security

	 * descriptor parameters, and secuirty descriptor itself

	 */

	secdesclen = max_t(u32, secdesclen, DEFSECDESCLEN);

	secdesclen = max_t(u32, secdesclen, DEFAULT_SEC_DESC_LEN);

	pnntsd = kmalloc(secdesclen, GFP_KERNEL);

	if (!pnntsd) {

		cERROR(1, "Unable to allocate security descriptor");

fs/cifs/cifsacl.h

+8 −3
Original line number Diff line number Diff line
@@ -25,9 +25,6 @@ 


#define NUM_AUTHS (6)	/* number of authority fields */

#define SID_MAX_SUB_AUTHORITIES (15) /* max 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
@@ -42,6 +39,14 @@ 
#define SIDOWNER 1

#define SIDGROUP 2



/*

 * Security Descriptor length containing DACL with 3 ACEs (one each for

 * owner, group and world).

 */

#define DEFAULT_SEC_DESC_LEN (sizeof(struct cifs_ntsd) + \

			      sizeof(struct cifs_acl) + \

			      (sizeof(struct cifs_ace) * 3))



/*

 * Maximum size of a string representation of a SID:

 *