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cifs: make cifs_copy_sid handle a source sid with variable size subauth arrays

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...and lift the restriction in id_to_sid upcall that the size must be
at least as big as a full cifs_sid.

Reviewed-by: Shirish Pargaonkar <shirishpargaonkar@gmail.com>
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <smfrench@gmail.com>
This commit is contained in:
Jeff Layton 2012-11-25 08:00:37 -05:00 committed by Steve French
parent 436bb435fc
commit 36f87ee70f
2 changed files with 11 additions and 2 deletions
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10
fs/cifs/cifsacl.c
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@ -277,8 +277,14 @@ compare_sids(const struct cifs_sid *ctsid, const struct cifs_sid *cwsid)
static void
cifs_copy_sid(struct cifs_sid *dst, const struct cifs_sid *src)
{
memcpy(dst, src, sizeof(*dst));
int i;
dst->revision = src->revision;
dst->num_subauth = min_t(u8, src->num_subauth, NUM_SUBAUTHS);
for (i = 0; i < NUM_AUTHS; ++i)
dst->authority[i] = src->authority[i];
for (i = 0; i < dst->num_subauth; ++i)
dst->sub_auth[i] = src->sub_auth[i];
}
static void
@ -427,7 +433,7 @@ id_to_sid(unsigned long cid, uint sidtype, struct cifs_sid *ssid)
if (IS_ERR(sidkey)) {
rc = -EINVAL;
cFYI(1, "%s: Can't map and id to a SID", __func__);
} else if (sidkey->datalen < sizeof(struct cifs_sid)) {
} else if (sidkey->datalen < CIFS_SID_BASE_SIZE) {
rc = -EIO;
cFYI(1, "%s: Downcall contained malformed key "
"(datalen=%hu)", __func__, sidkey->datalen);

3
fs/cifs/cifsacl.h
View File

@ -64,6 +64,9 @@ struct cifs_sid {
__le32 sub_auth[NUM_SUBAUTHS]; /* sub_auth[num_subauth] */
} __attribute__((packed));
/* size of a struct cifs_sid, sans sub_auth array */
#define CIFS_SID_BASE_SIZE (1 + 1 + NUM_AUTHS)
struct cifs_acl {
__le16 revision; /* revision level */
__le16 size;