diff options
| author | David Quigley <dpquigl@davequigley.com> | 2013-05-22 20:50:34 +0400 |
|---|---|---|
| committer | Trond Myklebust <Trond.Myklebust@netapp.com> | 2013-06-09 00:19:41 +0400 |
| commit | d47be3dfecaf20255af89a57460285c82d5271ad (patch) | |
| tree | 6427561f82a9bf90f17d748a865e3e0084919540 /security | |
| parent | 4488cc96c581f130f3e86283d514123dce0dd46b (diff) | |
| download | linux-d47be3dfecaf20255af89a57460285c82d5271ad.tar.xz | |
Security: Add hook to calculate context based on a negative dentry.
There is a time where we need to calculate a context without the
inode having been created yet. To do this we take the negative dentry and
calculate a context based on the process and the parent directory contexts.
Acked-by: Eric Paris <eparis@redhat.com>
Acked-by: James Morris <james.l.morris@oracle.com>
Signed-off-by: Matthew N. Dodd <Matthew.Dodd@sparta.com>
Signed-off-by: Miguel Rodel Felipe <Rodel_FM@dsi.a-star.edu.sg>
Signed-off-by: Phua Eu Gene <PHUA_Eu_Gene@dsi.a-star.edu.sg>
Signed-off-by: Khin Mi Mi Aung <Mi_Mi_AUNG@dsi.a-star.edu.sg>
Signed-off-by: Steve Dickson <steved@redhat.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Diffstat (limited to 'security')
| -rw-r--r-- | security/capability.c | 8 | ||||
| -rw-r--r-- | security/security.c | 10 | ||||
| -rw-r--r-- | security/selinux/hooks.c | 35 |
3 files changed, 53 insertions, 0 deletions
diff --git a/security/capability.c b/security/capability.c index 1728d4e375db..58578b4bdad4 100644 --- a/security/capability.c +++ b/security/capability.c @@ -109,6 +109,13 @@ static int cap_sb_parse_opts_str(char *options, struct security_mnt_opts *opts) return 0; } +static int cap_dentry_init_security(struct dentry *dentry, int mode, + struct qstr *name, void **ctx, + u32 *ctxlen) +{ + return 0; +} + static int cap_inode_alloc_security(struct inode *inode) { return 0; @@ -931,6 +938,7 @@ void __init security_fixup_ops(struct security_operations *ops) set_to_cap_if_null(ops, sb_set_mnt_opts); set_to_cap_if_null(ops, sb_clone_mnt_opts); set_to_cap_if_null(ops, sb_parse_opts_str); + set_to_cap_if_null(ops, dentry_init_security); set_to_cap_if_null(ops, inode_alloc_security); set_to_cap_if_null(ops, inode_free_security); set_to_cap_if_null(ops, inode_init_security); diff --git a/security/security.c b/security/security.c index a3dce87d1aef..0fe2b2ee9545 100644 --- a/security/security.c +++ b/security/security.c @@ -12,6 +12,7 @@ */ #include <linux/capability.h> +#include <linux/dcache.h> #include <linux/module.h> #include <linux/init.h> #include <linux/kernel.h> @@ -324,6 +325,15 @@ void security_inode_free(struct inode *inode) security_ops->inode_free_security(inode); } +int security_dentry_init_security(struct dentry *dentry, int mode, + struct qstr *name, void **ctx, + u32 *ctxlen) +{ + return security_ops->dentry_init_security(dentry, mode, name, + ctx, ctxlen); +} +EXPORT_SYMBOL(security_dentry_init_security); + int security_inode_init_security(struct inode *inode, struct inode *dir, const struct qstr *qstr, const initxattrs initxattrs, void *fs_data) diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c index 5c6f2cd2d095..b1f7bd727bd9 100644 --- a/security/selinux/hooks.c +++ b/security/selinux/hooks.c @@ -2515,6 +2515,40 @@ static void selinux_inode_free_security(struct inode *inode) inode_free_security(inode); } +static int selinux_dentry_init_security(struct dentry *dentry, int mode, + struct qstr *name, void **ctx, + u32 *ctxlen) +{ + const struct cred *cred = current_cred(); + struct task_security_struct *tsec; + struct inode_security_struct *dsec; + struct superblock_security_struct *sbsec; + struct inode *dir = dentry->d_parent->d_inode; + u32 newsid; + int rc; + + tsec = cred->security; + dsec = dir->i_security; + sbsec = dir->i_sb->s_security; + + if (tsec->create_sid && sbsec->behavior != SECURITY_FS_USE_MNTPOINT) { + newsid = tsec->create_sid; + } else { + rc = security_transition_sid(tsec->sid, dsec->sid, + inode_mode_to_security_class(mode), + name, + &newsid); + if (rc) { + printk(KERN_WARNING + "%s: security_transition_sid failed, rc=%d\n", + __func__, -rc); + return rc; + } + } + + return security_sid_to_context(newsid, (char **)ctx, ctxlen); +} + static int selinux_inode_init_security(struct inode *inode, struct inode *dir, const struct qstr *qstr, char **name, void **value, size_t *len) @@ -5562,6 +5596,7 @@ static struct security_operations selinux_ops = { .sb_clone_mnt_opts = selinux_sb_clone_mnt_opts, .sb_parse_opts_str = selinux_parse_opts_str, + .dentry_init_security = selinux_dentry_init_security, .inode_alloc_security = selinux_inode_alloc_security, .inode_free_security = selinux_inode_free_security, |