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authorEric Paris <eparis@redhat.com>2008-02-28 12:58:40 -0500
committerJames Morris <jmorris@namei.org>2008-04-18 20:26:06 +1000
commitb0c636b99997c8594da6a46e166ce4fcf6956fda (patch)
tree16308f0324846cd8c19180b6a45793268dd16f50 /security/selinux/hooks.c
parentd4ee4231a3a8731576ef0e0a7e1225e4fde1e659 (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.c31
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)