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Fixed computation of implicit uid/gid

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This commit is contained in:
jpandre 2008-04-20 09:45:30 +00:00
parent 9668345f61
commit 3df7110f69
1 changed files with 30 additions and 25 deletions
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55
libntfs-3g/security.c
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@ -1588,41 +1588,46 @@ static int upgrade_secur_desc(ntfs_volume *vol, const char *path,
* Returns 0 (root) if it does not match pattern
*/
static int findimplicit(const SID *xsid, const SID *pattern)
static int findimplicit(const SID *xsid, const SID *pattern, int parity)
{
BIGSID defsid;
SID *psid;
int xid; /* uid or gid */
int cnt;
int carry;
u32 xlast;
u32 rlast;
memcpy(&defsid,pattern,sid_size(pattern));
psid = (SID*)&defsid;
cnt = psid->sub_authority_count;
psid->sub_authority[cnt-1] = xsid->sub_authority[cnt-1];
xlast = le32_to_cpu(xsid->sub_authority[cnt-1]);
rlast = le32_to_cpu(pattern->sub_authority[cnt-1]);
if ((xlast > rlast) && !((xlast ^ rlast ^ parity) & 1)) {
/* direct check for basic situation */
if (same_sid(psid,xsid))
xid = ((le32_to_cpu(xsid->sub_authority[cnt-1])
- le32_to_cpu(pattern->sub_authority[cnt-1])) >> 1)
& 0x3fffffff;
else {
/*
* check whether part of mapping had to be recorded
* in a higher level authority
*/
carry = 1;
do {
psid->sub_authority[cnt-2]
= cpu_to_le32(le32_to_cpu(
psid->sub_authority[cnt-2]) + 1);
} while (!same_sid(psid,xsid) && (++carry < 4));
if (carry < 4)
xid = (((le32_to_cpu(xsid->sub_authority[cnt-1])
- le32_to_cpu(pattern->sub_authority[cnt-1])) >> 1)
& 0x3fffffff) | (carry << 30);
else
xid = 0;
}
if (same_sid(psid,xsid))
xid = ((xlast - rlast) >> 1) & 0x3fffffff;
else {
/*
* check whether part of mapping had to be recorded
* in a higher level authority
*/
carry = 1;
do {
psid->sub_authority[cnt-2]
= cpu_to_le32(le32_to_cpu(
psid->sub_authority[cnt-2]) + 1);
} while (!same_sid(psid,xsid) && (++carry < 4));
if (carry < 4)
xid = (((xlast - rlast) >> 1) & 0x3fffffff)
| (carry << 30);
else
xid = 0;
}
} else
xid = 0;
return (xid);
}
@ -1644,7 +1649,7 @@ static int findowner(struct SECURITY_CONTEXT *scx, const SID *usid)
/*
* No explicit mapping found, try implicit mapping
*/
uid = findimplicit(usid,p->sid);
uid = findimplicit(usid,p->sid,0);
else
uid = (p ? p->xid : 0);
return (uid);
@ -1669,7 +1674,7 @@ static gid_t findgroup(struct SECURITY_CONTEXT *scx, const SID * gsid)
/*
* No explicit mapping found, try implicit mapping
*/
gid = findimplicit(gsid,p->sid);
gid = findimplicit(gsid,p->sid,1);
else
gid = (p ? p->xid : 0);
return (gid);