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CRED: Wrap task credential accesses in the filesystem subsystem

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Wrap access to task credentials so that they can be separated more easily from
the task_struct during the introduction of COW creds.

Change most current->(|e|s|fs)[ug]id to current_(|e|s|fs)[ug]id().

Change some task->e?[ug]id to task_e?[ug]id().  In some places it makes more
sense to use RCU directly rather than a convenient wrapper; these will be
addressed by later patches.

Signed-off-by: David Howells <dhowells@redhat.com>
Reviewed-by: James Morris <jmorris@namei.org>
Acked-by: Serge Hallyn <serue@us.ibm.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: James Morris <jmorris@namei.org>
This commit is contained in:
David Howells
2008-11-14 10:39:05 +11:00
committed by James Morris
parent 82ab8deda7
commit da9592edeb
15 changed files with 38 additions and 36 deletions
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10
fs/namei.c
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@@ -186,7 +186,7 @@ int generic_permission(struct inode *inode, int mask,
mask &= MAY_READ | MAY_WRITE | MAY_EXEC;
if (current->fsuid == inode->i_uid)
if (current_fsuid() == inode->i_uid)
mode >>= 6;
else {
if (IS_POSIXACL(inode) && (mode & S_IRWXG) && check_acl) {
@@ -441,7 +441,7 @@ static int exec_permission_lite(struct inode *inode)
if (inode->i_op && inode->i_op->permission)
return -EAGAIN;
if (current->fsuid == inode->i_uid)
if (current_fsuid() == inode->i_uid)
mode >>= 6;
else if (in_group_p(inode->i_gid))
mode >>= 3;
@@ -1334,11 +1334,13 @@ static int user_path_parent(int dfd, const char __user *path,
*/
static inline int check_sticky(struct inode *dir, struct inode *inode)
{
uid_t fsuid = current_fsuid();
if (!(dir->i_mode & S_ISVTX))
return 0;
if (inode->i_uid == current->fsuid)
if (inode->i_uid == fsuid)
return 0;
if (dir->i_uid == current->fsuid)
if (dir->i_uid == fsuid)
return 0;
return !capable(CAP_FOWNER);
}