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linux-sg2042
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[PATCH] pass MAY_OPEN to vfs_permission() explicitly 

... and get rid of the last "let's deduce mask from nameidata->flags"
bit.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2008-07-17 09:37:02 -04:00
parent a110343f0d
commit b77b0646ef
7 changed files with 15 additions and 24 deletions
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4
fs/exec.c
View File

@ -118,7 +118,7 @@ asmlinkage long sys_uselib(const char __user * library)
if (!S_ISREG(nd.path.dentry->d_inode->i_mode))
goto exit;
error = vfs_permission(&nd, MAY_READ | MAY_EXEC);
error = vfs_permission(&nd, MAY_READ | MAY_EXEC | MAY_OPEN);
if (error)
goto exit;
@ -666,7 +666,7 @@ struct file *open_exec(const char *name)
struct inode *inode = nd.path.dentry->d_inode;
file = ERR_PTR(-EACCES);
if (S_ISREG(inode->i_mode)) {
int err = vfs_permission(&nd, MAY_EXEC);
int err = vfs_permission(&nd, MAY_EXEC | MAY_OPEN);
file = ERR_PTR(err);
if (!err) {
file = nameidata_to_filp(&nd,

13
fs/namei.c
View File

@ -263,12 +263,7 @@ int permission(struct inode *inode, int mask, struct nameidata *nd)
/* Ordinary permission routines do not understand MAY_APPEND. */
if (inode->i_op && inode->i_op->permission) {
int extra = 0;
if (nd) {
if (nd->flags & LOOKUP_OPEN)
extra |= MAY_OPEN;
}
retval = inode->i_op->permission(inode, mask | extra);
retval = inode->i_op->permission(inode, mask);
if (!retval) {
/*
* Exec permission on a regular file is denied if none
@ -292,7 +287,7 @@ int permission(struct inode *inode, int mask, struct nameidata *nd)
return retval;
return security_inode_permission(inode,
mask & (MAY_READ|MAY_WRITE|MAY_EXEC), nd);
mask & (MAY_READ|MAY_WRITE|MAY_EXEC));
}
/**
@ -492,7 +487,7 @@ static int exec_permission_lite(struct inode *inode,
return -EACCES;
ok:
return security_inode_permission(inode, MAY_EXEC, nd);
return security_inode_permission(inode, MAY_EXEC);
}
/*
@ -1692,7 +1687,7 @@ struct file *do_filp_open(int dfd, const char *pathname,
int will_write;
int flag = open_to_namei_flags(open_flag);
acc_mode = ACC_MODE(flag);
acc_mode = MAY_OPEN | ACC_MODE(flag);
/* O_TRUNC implies we need access checks for write permissions */
if (flag & O_TRUNC)

7
include/linux/security.h
View File

@ -1362,7 +1362,7 @@ struct security_operations {
struct inode *new_dir, struct dentry *new_dentry);
int (*inode_readlink) (struct dentry *dentry);
int (*inode_follow_link) (struct dentry *dentry, struct nameidata *nd);
int (*inode_permission) (struct inode *inode, int mask, struct nameidata *nd);
int (*inode_permission) (struct inode *inode, int mask);
int (*inode_setattr) (struct dentry *dentry, struct iattr *attr);
int (*inode_getattr) (struct vfsmount *mnt, struct dentry *dentry);
void (*inode_delete) (struct inode *inode);
@ -1628,7 +1628,7 @@ int security_inode_rename(struct inode *old_dir, struct dentry *old_dentry,
struct inode *new_dir, struct dentry *new_dentry);
int security_inode_readlink(struct dentry *dentry);
int security_inode_follow_link(struct dentry *dentry, struct nameidata *nd);
int security_inode_permission(struct inode *inode, int mask, struct nameidata *nd);
int security_inode_permission(struct inode *inode, int mask);
int security_inode_setattr(struct dentry *dentry, struct iattr *attr);
int security_inode_getattr(struct vfsmount *mnt, struct dentry *dentry);
void security_inode_delete(struct inode *inode);
@ -2021,8 +2021,7 @@ static inline int security_inode_follow_link(struct dentry *dentry,
return 0;
}
static inline int security_inode_permission(struct inode *inode, int mask,
struct nameidata *nd)
static inline int security_inode_permission(struct inode *inode, int mask)
{
return 0;
}

3
security/capability.c
View File

@ -211,8 +211,7 @@ static int cap_inode_follow_link(struct dentry *dentry,
return 0;
}
static int cap_inode_permission(struct inode *inode, int mask,
struct nameidata *nd)
static int cap_inode_permission(struct inode *inode, int mask)
{
return 0;
}

4
security/security.c
View File

@ -429,11 +429,11 @@ int security_inode_follow_link(struct dentry *dentry, struct nameidata *nd)
return security_ops->inode_follow_link(dentry, nd);
}
int security_inode_permission(struct inode *inode, int mask, struct nameidata *nd)
int security_inode_permission(struct inode *inode, int mask)
{
if (unlikely(IS_PRIVATE(inode)))
return 0;
return security_ops->inode_permission(inode, mask, nd);
return security_ops->inode_permission(inode, mask);
}
int security_inode_setattr(struct dentry *dentry, struct iattr *attr)

5
security/selinux/hooks.c
View File

@ -2624,12 +2624,11 @@ static int selinux_inode_follow_link(struct dentry *dentry, struct nameidata *na
return dentry_has_perm(current, NULL, dentry, FILE__READ);
}
static int selinux_inode_permission(struct inode *inode, int mask,
struct nameidata *nd)
static int selinux_inode_permission(struct inode *inode, int mask)
{
int rc;
rc = secondary_ops->inode_permission(inode, mask, nd);
rc = secondary_ops->inode_permission(inode, mask);
if (rc)
return rc;

3
security/smack/smack_lsm.c
View File

@ -522,8 +522,7 @@ static int smack_inode_rename(struct inode *old_inode,
*
* Returns 0 if access is permitted, -EACCES otherwise
*/
static int smack_inode_permission(struct inode *inode, int mask,
struct nameidata *nd)
static int smack_inode_permission(struct inode *inode, int mask)
{
/*
* No permission to check. Existence test. Yup, it's there.