diff options
| author | Eric Paris <eparis@redhat.com> | 2008-02-28 12:58:40 -0500 |
|---|---|---|
| committer | James Morris <jmorris@namei.org> | 2008-04-18 20:26:06 +1000 |
| commit | b0c636b99997c8594da6a46e166ce4fcf6956fda (patch) | |
| tree | 16308f0324846cd8c19180b6a45793268dd16f50 /security/selinux/hooks.c | |
| parent | d4ee4231a3a8731576ef0e0a7e1225e4fde1e659 (diff) | |
SELinux: create new open permission
Adds a new open permission inside SELinux when 'opening' a file. The idea
is that opening a file and reading/writing to that file are not the same
thing. Its different if a program had its stdout redirected to /tmp/output
than if the program tried to directly open /tmp/output. This should allow
policy writers to more liberally give read/write permissions across the
policy while still blocking many design and programing flaws SELinux is so
good at catching today.
Signed-off-by: Eric Paris <eparis@redhat.com>
Acked-by: Stephen Smalley <sds@tycho.nsa.gov>
Reviewed-by: Paul Moore <paul.moore@hp.com>
Signed-off-by: James Morris <jmorris@namei.org>
Diffstat (limited to 'security/selinux/hooks.c')
| -rw-r--r-- | security/selinux/hooks.c | 31 |
1 files changed, 30 insertions, 1 deletions
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c index 710894d4841..d569cde440e 100644 --- a/security/selinux/hooks.c +++ b/security/selinux/hooks.c @@ -1615,6 +1615,35 @@ static inline u32 file_mask_to_av(int mode, int mask) 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 open_file_to_av " + "with unknown mode:%x\n", mode); + } + return av; +} + /* Convert a Linux file to an access vector. */ static inline u32 file_to_av(struct file *file) { @@ -2532,7 +2561,7 @@ static int selinux_inode_permission(struct inode *inode, int mask, } return inode_has_perm(current, inode, - file_mask_to_av(inode->i_mode, mask), NULL); + open_file_mask_to_av(inode->i_mode, mask), NULL); } static int selinux_inode_setattr(struct dentry *dentry, struct iattr *iattr) |