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Fixed Posix ACLs for big-endian computers

PERMISSION_HANDLING_BRANCH
Jean-Pierre André 2010-10-26 08:59:51 +02:00
parent a92c57735b
commit dd25fce933
1 changed files with 145 additions and 0 deletions
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145
libntfs-3g/xattrs.c
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@ -59,6 +59,29 @@
#include "logging.h"
#include "xattrs.h"
#if POSIXACLS
#if __BYTE_ORDER == __BIG_ENDIAN
/*
* Posix ACL structures
*/
struct LE_POSIX_ACE {
le16 tag;
le16 perms;
le32 id;
} __attribute__((__packed__));
struct LE_POSIX_ACL {
u8 version;
u8 flags;
le16 filler;
struct LE_POSIX_ACE ace[0];
} __attribute__((__packed__));
#endif
#endif
static const char xattr_ntfs_3g[] = "ntfs-3g.";
static const char nf_ns_user_prefix[] = "user.";
static const int nf_ns_user_prefix_len = sizeof(nf_ns_user_prefix) - 1;
@ -124,6 +147,56 @@ static void fix_big_endian(char *p, int size)
#endif
}
#if POSIXACLS
#if __BYTE_ORDER == __BIG_ENDIAN
/*
* Make a Posix ACL CPU endian
*/
static int le_acl_to_cpu(const struct LE_POSIX_ACL *le_acl, size_t size,
struct POSIX_ACL *acl)
{
int i;
int cnt;
acl->version = le_acl->version;
acl->flags = le_acl->flags;
acl->filler = 0;
cnt = (size - sizeof(struct LE_POSIX_ACL)) / sizeof(struct LE_POSIX_ACE);
for (i=0; i<cnt; i++) {
acl->ace[i].tag = le16_to_cpu(le_acl->ace[i].tag);
acl->ace[i].perms = le16_to_cpu(le_acl->ace[i].perms);
acl->ace[i].id = le32_to_cpu(le_acl->ace[i].id);
}
return (0);
}
/*
* Make a Posix ACL little endian
*/
int cpu_to_le_acl(const struct POSIX_ACL *acl, size_t size,
struct LE_POSIX_ACL *le_acl)
{
int i;
int cnt;
le_acl->version = acl->version;
le_acl->flags = acl->flags;
le_acl->filler = const_cpu_to_le16(0);
cnt = (size - sizeof(struct POSIX_ACL)) / sizeof(struct POSIX_ACE);
for (i=0; i<cnt; i++) {
le_acl->ace[i].tag = cpu_to_le16(acl->ace[i].tag);
le_acl->ace[i].perms = cpu_to_le16(acl->ace[i].perms);
le_acl->ace[i].id = cpu_to_le32(acl->ace[i].id);
}
return (0);
}
#endif
#endif
/*
* Determine whether an extended attribute is mapped to
* internal data (original name in system namespace, or renamed)
@ -216,6 +289,11 @@ int ntfs_xattr_system_getxattr(struct SECURITY_CONTEXT *scx,
{
int res;
int i;
#if POSIXACLS
#if __BYTE_ORDER == __BIG_ENDIAN
struct POSIX_ACL *acl;
#endif
#endif
/*
* the returned value is the needed
@ -228,6 +306,36 @@ int ntfs_xattr_system_getxattr(struct SECURITY_CONTEXT *scx,
res = ntfs_get_ntfs_acl(scx, ni, value, size);
break;
#if POSIXACLS
#if __BYTE_ORDER == __BIG_ENDIAN
case XATTR_POSIX_ACC :
acl = (struct POSIX_ACL*)ntfs_malloc(size);
if (acl) {
res = ntfs_get_posix_acl(scx, ni,
nf_ns_xattr_posix_access, (char*)acl, size);
if (res > 0) {
if (cpu_to_le_acl(acl,res,
(struct LE_POSIX_ACL*)value))
res = -errno;
}
free(acl);
} else
res = -errno;
break;
case XATTR_POSIX_DEF :
acl = (struct POSIX_ACL*)ntfs_malloc(size);
if (acl) {
res = ntfs_get_posix_acl(scx, ni,
nf_ns_xattr_posix_default, (char*)acl, size);
if (res > 0) {
if (cpu_to_le_acl(acl,res,
(struct LE_POSIX_ACL*)value))
res = -errno;
}
free(acl);
} else
res = -errno;
break;
#else
case XATTR_POSIX_ACC :
res = ntfs_get_posix_acl(scx, ni, nf_ns_xattr_posix_access,
value, size);
@ -236,6 +344,7 @@ int ntfs_xattr_system_getxattr(struct SECURITY_CONTEXT *scx,
res = ntfs_get_posix_acl(scx, ni, nf_ns_xattr_posix_default,
value, size);
break;
#endif
#endif
case XATTR_NTFS_ATTRIB :
res = ntfs_get_ntfs_attrib(ni, value, size);
@ -304,12 +413,47 @@ int ntfs_xattr_system_setxattr(struct SECURITY_CONTEXT *scx,
int res;
int i;
char buf[4*sizeof(u64)];
#if POSIXACLS
#if __BYTE_ORDER == __BIG_ENDIAN
struct POSIX_ACL *acl;
#endif
#endif
switch (attr) {
case XATTR_NTFS_ACL :
res = ntfs_set_ntfs_acl(scx, ni, value, size, flags);
break;
#if POSIXACLS
#if __BYTE_ORDER == __BIG_ENDIAN
case XATTR_POSIX_ACC :
acl = (struct POSIX_ACL*)ntfs_malloc(size);
if (acl) {
if (!le_acl_to_cpu((const struct LE_POSIX_ACL*)value,
size, acl)) {
res = ntfs_set_posix_acl(scx ,ni ,
nf_ns_xattr_posix_access,
(char*)acl, size, flags);
} else
res = -errno;
free(acl);
} else
res = -errno;
break;
case XATTR_POSIX_DEF :
acl = (struct POSIX_ACL*)ntfs_malloc(size);
if (acl) {
if (!le_acl_to_cpu((const struct LE_POSIX_ACL*)value,
size, acl)) {
res = ntfs_set_posix_acl(scx ,ni ,
nf_ns_xattr_posix_default,
(char*)acl, size, flags);
} else
res = -errno;
free(acl);
} else
res = -errno;
break;
#else
case XATTR_POSIX_ACC :
res = ntfs_set_posix_acl(scx ,ni , nf_ns_xattr_posix_access,
value, size, flags);
@ -318,6 +462,7 @@ int ntfs_xattr_system_setxattr(struct SECURITY_CONTEXT *scx,
res = ntfs_set_posix_acl(scx, ni, nf_ns_xattr_posix_default,
value, size, flags);
break;
#endif
#endif
case XATTR_NTFS_ATTRIB :
res = ntfs_set_ntfs_attrib(ni, value, size, flags);