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SELinux: check open perms in dentry_open not inode_permission

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Some operations, like searching a directory path or connecting a unix domain
socket, make explicit calls into inode_permission.  Our choices are to
either try to come up with a signature for all of the explicit calls to
inode_permission and do not check open on those, or to move the open checks to
dentry_open where we know this is always an open operation.  This patch moves
the checks to dentry_open.

Signed-off-by: Eric Paris <eparis@redhat.com>
Acked-by:  Stephen Smalley <sds@tycho.nsa.gov>
Signed-off-by: James Morris <jmorris@namei.org>
This commit is contained in:
Eric Paris 2008-10-29 17:06:46 -04:00 committed by James Morris
parent 0da939b005
commit 8b6a5a37f8
1 changed files with 32 additions and 31 deletions
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63
security/selinux/hooks.c
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@ -1686,35 +1686,6 @@ static inline u32 file_mask_to_av(int mode, int mask)
return av; return av;
} }
/*
* Convert a file mask to an access vector and include the correct open
* open permission.
*/
static inline u32 open_file_mask_to_av(int mode, int mask)
{
u32 av = file_mask_to_av(mode, mask);
if (selinux_policycap_openperm) {
/*
* lnk files and socks do not really have an 'open'
*/
if (S_ISREG(mode))
av |= FILE__OPEN;
else if (S_ISCHR(mode))
av |= CHR_FILE__OPEN;
else if (S_ISBLK(mode))
av |= BLK_FILE__OPEN;
else if (S_ISFIFO(mode))
av |= FIFO_FILE__OPEN;
else if (S_ISDIR(mode))
av |= DIR__OPEN;
else
printk(KERN_ERR "SELinux: WARNING: inside %s with "
"unknown mode:%x\n", __func__, mode);
}
return av;
}
/* Convert a Linux file to an access vector. */ /* Convert a Linux file to an access vector. */
static inline u32 file_to_av(struct file *file) static inline u32 file_to_av(struct file *file)
{ {
@ -1738,6 +1709,36 @@ static inline u32 file_to_av(struct file *file)
return av; return av;
} }
/*
* Convert a file to an access vector and include the correct open
* open permission.
*/
static inline u32 open_file_to_av(struct file *file)
{
u32 av = file_to_av(file);
if (selinux_policycap_openperm) {
mode_t mode = file->f_path.dentry->d_inode->i_mode;
/*
* lnk files and socks do not really have an 'open'
*/
if (S_ISREG(mode))
av |= FILE__OPEN;
else if (S_ISCHR(mode))
av |= CHR_FILE__OPEN;
else if (S_ISBLK(mode))
av |= BLK_FILE__OPEN;
else if (S_ISFIFO(mode))
av |= FIFO_FILE__OPEN;
else if (S_ISDIR(mode))
av |= DIR__OPEN;
else
printk(KERN_ERR "SELinux: WARNING: inside %s with "
"unknown mode:%o\n", __func__, mode);
}
return av;
}
/* Hook functions begin here. */ /* Hook functions begin here. */
static int selinux_ptrace_may_access(struct task_struct *child, static int selinux_ptrace_may_access(struct task_struct *child,
@ -2654,7 +2655,7 @@ static int selinux_inode_permission(struct inode *inode, int mask)
} }
return inode_has_perm(current, inode, return inode_has_perm(current, inode,
open_file_mask_to_av(inode->i_mode, mask), NULL); file_mask_to_av(inode->i_mode, mask), NULL);
} }
static int selinux_inode_setattr(struct dentry *dentry, struct iattr *iattr) static int selinux_inode_setattr(struct dentry *dentry, struct iattr *iattr)
@ -3170,7 +3171,7 @@ static int selinux_dentry_open(struct file *file)
* new inode label or new policy. * new inode label or new policy.
* This check is not redundant - do not remove. * This check is not redundant - do not remove.
*/ */
return inode_has_perm(current, inode, file_to_av(file), NULL); return inode_has_perm(current, inode, open_file_to_av(file), NULL);
} }
/* task security operations */ /* task security operations */