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authorAl Viro <viro@zeniv.linux.org.uk>2007-06-07 11:13:31 -0400
committerAl Viro <viro@zeniv.linux.org.uk>2007-07-22 09:57:02 -0400
commit4259fa01a2d2aa3e589b34ba7624080232d9c1ff (patch)
tree3aa83d784c4db22f3b62e4d963757497555c5e5c
parent74f2345b6be1410f824cb7dd638d2c10a9709379 (diff)
downloadlinux-2.6.34-ux500-4259fa01a2d2aa3e589b34ba7624080232d9c1ff.tar.gz
[PATCH] get rid of AVC_PATH postponed treatment
Selinux folks had been complaining about the lack of AVC_PATH records when audit is disabled. I must admit my stupidity - I assumed that avc_audit() really couldn't use audit_log_d_path() because of deadlocks (== could be called with dcache_lock or vfsmount_lock held). Shouldn't have made that assumption - it never gets called that way. It _is_ called under spinlocks, but not those. Since audit_log_d_path() uses ab->gfp_mask for allocations, kmalloc() in there is not a problem. IOW, the simple fix is sufficient: let's rip AUDIT_AVC_PATH out and simply generate pathname as part of main record. It's trivial to do. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Acked-by: James Morris <jmorris@namei.org>
-rw-r--r--include/linux/audit.h2
-rw-r--r--kernel/auditsc.c47
-rw-r--r--security/selinux/avc.c15
3 files changed, 8 insertions, 56 deletions
diff --git a/include/linux/audit.h b/include/linux/audit.h
index a35859ab2fd..4bbd8601b8f 100644
--- a/include/linux/audit.h
+++ b/include/linux/audit.h
@@ -411,7 +411,6 @@ extern int audit_bprm(struct linux_binprm *bprm);
extern int audit_socketcall(int nargs, unsigned long *args);
extern int audit_sockaddr(int len, void *addr);
extern int __audit_fd_pair(int fd1, int fd2);
-extern int audit_avc_path(struct dentry *dentry, struct vfsmount *mnt);
extern int audit_set_macxattr(const char *name);
extern int __audit_mq_open(int oflag, mode_t mode, struct mq_attr __user *u_attr);
extern int __audit_mq_timedsend(mqd_t mqdes, size_t msg_len, unsigned int msg_prio, const struct timespec __user *u_abs_timeout);
@@ -491,7 +490,6 @@ extern int audit_signals;
#define audit_socketcall(n,a) ({ 0; })
#define audit_fd_pair(n,a) ({ 0; })
#define audit_sockaddr(len, addr) ({ 0; })
-#define audit_avc_path(dentry, mnt) ({ 0; })
#define audit_set_macxattr(n) do { ; } while (0)
#define audit_mq_open(o,m,a) ({ 0; })
#define audit_mq_timedsend(d,l,p,t) ({ 0; })
diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index f5e917e60ac..bde1124d590 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -173,12 +173,6 @@ struct audit_aux_data_fd_pair {
int fd[2];
};
-struct audit_aux_data_path {
- struct audit_aux_data d;
- struct dentry *dentry;
- struct vfsmount *mnt;
-};
-
struct audit_aux_data_pids {
struct audit_aux_data d;
pid_t target_pid[AUDIT_AUX_PIDS];
@@ -654,12 +648,6 @@ static inline void audit_free_aux(struct audit_context *context)
struct audit_aux_data *aux;
while ((aux = context->aux)) {
- if (aux->type == AUDIT_AVC_PATH) {
- struct audit_aux_data_path *axi = (void *)aux;
- dput(axi->dentry);
- mntput(axi->mnt);
- }
-
context->aux = aux->next;
kfree(aux);
}
@@ -1038,11 +1026,6 @@ static void audit_log_exit(struct audit_context *context, struct task_struct *ts
audit_log_hex(ab, axs->a, axs->len);
break; }
- case AUDIT_AVC_PATH: {
- struct audit_aux_data_path *axi = (void *)aux;
- audit_log_d_path(ab, "path=", axi->dentry, axi->mnt);
- break; }
-
case AUDIT_FD_PAIR: {
struct audit_aux_data_fd_pair *axs = (void *)aux;
audit_log_format(ab, "fd0=%d fd1=%d", axs->fd[0], axs->fd[1]);
@@ -1991,36 +1974,6 @@ void __audit_ptrace(struct task_struct *t)
}
/**
- * audit_avc_path - record the granting or denial of permissions
- * @dentry: dentry to record
- * @mnt: mnt to record
- *
- * Returns 0 for success or NULL context or < 0 on error.
- *
- * Called from security/selinux/avc.c::avc_audit()
- */
-int audit_avc_path(struct dentry *dentry, struct vfsmount *mnt)
-{
- struct audit_aux_data_path *ax;
- struct audit_context *context = current->audit_context;
-
- if (likely(!context))
- return 0;
-
- ax = kmalloc(sizeof(*ax), GFP_ATOMIC);
- if (!ax)
- return -ENOMEM;
-
- ax->dentry = dget(dentry);
- ax->mnt = mntget(mnt);
-
- ax->d.type = AUDIT_AVC_PATH;
- ax->d.next = context->aux;
- context->aux = (void *)ax;
- return 0;
-}
-
-/**
* audit_signal_info - record signal info for shutting down audit subsystem
* @sig: signal value
* @t: task being signaled
diff --git a/security/selinux/avc.c b/security/selinux/avc.c
index ecd06738453..0e69adf63bd 100644
--- a/security/selinux/avc.c
+++ b/security/selinux/avc.c
@@ -570,10 +570,12 @@ void avc_audit(u32 ssid, u32 tsid,
case AVC_AUDIT_DATA_FS:
if (a->u.fs.dentry) {
struct dentry *dentry = a->u.fs.dentry;
- if (a->u.fs.mnt)
- audit_avc_path(dentry, a->u.fs.mnt);
- audit_log_format(ab, " name=");
- audit_log_untrustedstring(ab, dentry->d_name.name);
+ if (a->u.fs.mnt) {
+ audit_log_d_path(ab, "path=", dentry, a->u.fs.mnt);
+ } else {
+ audit_log_format(ab, " name=");
+ audit_log_untrustedstring(ab, dentry->d_name.name);
+ }
inode = dentry->d_inode;
} else if (a->u.fs.inode) {
struct dentry *dentry;
@@ -624,9 +626,8 @@ void avc_audit(u32 ssid, u32 tsid,
case AF_UNIX:
u = unix_sk(sk);
if (u->dentry) {
- audit_avc_path(u->dentry, u->mnt);
- audit_log_format(ab, " name=");
- audit_log_untrustedstring(ab, u->dentry->d_name.name);
+ audit_log_d_path(ab, "path=",
+ u->dentry, u->mnt);
break;
}
if (!u->addr)