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SELinux: introduce path_has_perm

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We currently have inode_has_perm and dentry_has_perm.  dentry_has_perm just
calls inode_has_perm with additional audit data.  But dentry_has_perm can
take either a dentry or a path.  Split those to make the code obvious and
to fix the previous problem where I thought dentry_has_perm always had a
valid dentry and mnt.

Signed-off-by: Eric Paris <eparis@redhat.com>
This commit is contained in:
Eric Paris 2011-04-28 16:04:24 -04:00
parent a8d05c81fb
commit 2875fa0083
1 changed files with 30 additions and 14 deletions
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44
security/selinux/hooks.c
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@ -1499,16 +1499,29 @@ static int inode_has_perm(const struct cred *cred,
the dentry to help the auditing code to more easily generate the
pathname if needed. */
static inline int dentry_has_perm(const struct cred *cred,
struct vfsmount *mnt,
struct dentry *dentry,
u32 av)
{
struct inode *inode = dentry->d_inode;
struct common_audit_data ad;
COMMON_AUDIT_DATA_INIT(&ad, DENTRY);
ad.u.dentry = dentry;
return inode_has_perm(cred, inode, av, &ad, 0);
}
/* Same as inode_has_perm, but pass explicit audit data containing
the path to help the auditing code to more easily generate the
pathname if needed. */
static inline int path_has_perm(const struct cred *cred,
struct path *path,
u32 av)
{
struct inode *inode = path->dentry->d_inode;
struct common_audit_data ad;
COMMON_AUDIT_DATA_INIT(&ad, PATH);
ad.u.path.mnt = mnt;
ad.u.path.dentry = dentry;
ad.u.path = *path;
return inode_has_perm(cred, inode, av, &ad, 0);
}
@ -1896,7 +1909,7 @@ static int selinux_quota_on(struct dentry *dentry)
{
const struct cred *cred = current_cred();
return dentry_has_perm(cred, NULL, dentry, FILE__QUOTAON);
return dentry_has_perm(cred, dentry, FILE__QUOTAON);
}
static int selinux_syslog(int type)
@ -2496,8 +2509,7 @@ static int selinux_mount(char *dev_name,
return superblock_has_perm(cred, path->mnt->mnt_sb,
FILESYSTEM__REMOUNT, NULL);
else
return dentry_has_perm(cred, path->mnt, path->dentry,
FILE__MOUNTON);
return path_has_perm(cred, path, FILE__MOUNTON);
}
static int selinux_umount(struct vfsmount *mnt, int flags)
@ -2630,14 +2642,14 @@ static int selinux_inode_readlink(struct dentry *dentry)
{
const struct cred *cred = current_cred();
return dentry_has_perm(cred, NULL, dentry, FILE__READ);
return dentry_has_perm(cred, dentry, FILE__READ);
}
static int selinux_inode_follow_link(struct dentry *dentry, struct nameidata *nameidata)
{
const struct cred *cred = current_cred();
return dentry_has_perm(cred, NULL, dentry, FILE__READ);
return dentry_has_perm(cred, dentry, FILE__READ);
}
static int selinux_inode_permission(struct inode *inode, int mask, unsigned flags)
@ -2680,16 +2692,20 @@ static int selinux_inode_setattr(struct dentry *dentry, struct iattr *iattr)
if (ia_valid & (ATTR_MODE | ATTR_UID | ATTR_GID |
ATTR_ATIME_SET | ATTR_MTIME_SET | ATTR_TIMES_SET))
return dentry_has_perm(cred, NULL, dentry, FILE__SETATTR);
return dentry_has_perm(cred, dentry, FILE__SETATTR);
return dentry_has_perm(cred, NULL, dentry, FILE__WRITE);
return dentry_has_perm(cred, dentry, FILE__WRITE);
}
static int selinux_inode_getattr(struct vfsmount *mnt, struct dentry *dentry)
{
const struct cred *cred = current_cred();
struct path path;
return dentry_has_perm(cred, mnt, dentry, FILE__GETATTR);
path.dentry = dentry;
path.mnt = mnt;
return path_has_perm(cred, &path, FILE__GETATTR);
}
static int selinux_inode_setotherxattr(struct dentry *dentry, const char *name)
@ -2710,7 +2726,7 @@ static int selinux_inode_setotherxattr(struct dentry *dentry, const char *name)
/* Not an attribute we recognize, so just check the
ordinary setattr permission. */
return dentry_has_perm(cred, NULL, dentry, FILE__SETATTR);
return dentry_has_perm(cred, dentry, FILE__SETATTR);
}
static int selinux_inode_setxattr(struct dentry *dentry, const char *name,
@ -2797,14 +2813,14 @@ static int selinux_inode_getxattr(struct dentry *dentry, const char *name)
{
const struct cred *cred = current_cred();
return dentry_has_perm(cred, NULL, dentry, FILE__GETATTR);
return dentry_has_perm(cred, dentry, FILE__GETATTR);
}
static int selinux_inode_listxattr(struct dentry *dentry)
{
const struct cred *cred = current_cred();
return dentry_has_perm(cred, NULL, dentry, FILE__GETATTR);
return dentry_has_perm(cred, dentry, FILE__GETATTR);
}
static int selinux_inode_removexattr(struct dentry *dentry, const char *name)