From d09ca73979460b96d5d4684d588b188be9a1f57d Mon Sep 17 00:00:00 2001 From: Eric Paris Date: Fri, 23 Jul 2010 11:43:57 -0400 Subject: [PATCH] security: make LSMs explicitly mask off permissions SELinux needs to pass the MAY_ACCESS flag so it can handle auditting correctly. Presently the masking of MAY_* flags is done in the VFS. In order to allow LSMs to decide what flags they care about and what flags they don't just pass them all and the each LSM mask off what they don't need. This patch should contain no functional changes to either the VFS or any LSM. Signed-off-by: Eric Paris Acked-by: Stephen D. Smalley Signed-off-by: James Morris --- fs/namei.c | 3 +-- security/selinux/hooks.c | 2 ++ security/smack/smack_lsm.c | 2 ++ 3 files changed, 5 insertions(+), 2 deletions(-) diff --git a/fs/namei.c b/fs/namei.c index fe34c2b879f..42d2d28fb82 100644 --- a/fs/namei.c +++ b/fs/namei.c @@ -282,8 +282,7 @@ int inode_permission(struct inode *inode, int mask) if (retval) return retval; - return security_inode_permission(inode, - mask & (MAY_READ|MAY_WRITE|MAY_EXEC|MAY_APPEND)); + return security_inode_permission(inode, mask); } /** diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c index 85338f0c048..0c98846f188 100644 --- a/security/selinux/hooks.c +++ b/security/selinux/hooks.c @@ -2645,6 +2645,8 @@ static int selinux_inode_permission(struct inode *inode, int mask) { const struct cred *cred = current_cred(); + mask &= (MAY_READ|MAY_WRITE|MAY_EXEC|MAY_APPEND); + if (!mask) { /* No permission to check. Existence test. */ return 0; diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c index 07abc9ce72f..9192ba366a4 100644 --- a/security/smack/smack_lsm.c +++ b/security/smack/smack_lsm.c @@ -598,6 +598,8 @@ static int smack_inode_rename(struct inode *old_inode, static int smack_inode_permission(struct inode *inode, int mask) { struct smk_audit_info ad; + + mask &= (MAY_READ|MAY_WRITE|MAY_EXEC|MAY_APPEND); /* * No permission to check. Existence test. Yup, it's there. */ -- 2.39.3