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AUDIT: Avoid sleeping function in SElinux AVC audit.

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This patch changes the SELinux AVC to defer logging of paths to the audit
framework upon syscall exit, by saving a reference to the (dentry,vfsmount)
pair in an auxiliary audit item on the current audit context for processing
by audit_log_exit.

Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>
Signed-off-by: David Woodhouse <dwmw2@infradead.org>
This commit is contained in:
Stephen Smalley 2005-05-21 00:15:52 +01:00 • committed by David Woodhouse
parent fb19b4c6aa
commit 011161051b
3 changed files with 51 additions and 9 deletions
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40
kernel/auditsc.c
View file

@ -34,6 +34,7 @@
#include <asm/types.h>
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/mount.h>
#include <linux/socket.h>
#include <linux/audit.h>
#include <linux/personality.h>
@ -124,6 +125,11 @@ struct audit_aux_data_sockaddr {
char a[0];
};
struct audit_aux_data_path {
struct audit_aux_data d;
struct dentry *dentry;
struct vfsmount *mnt;
};
/* The per-task audit context. */
struct audit_context {
@ -553,6 +559,11 @@ 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);
}
@ -724,6 +735,14 @@ static void audit_log_exit(struct audit_context *context)
audit_log_format(ab, "saddr=");
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);
dput(axi->dentry);
mntput(axi->mnt);
break; }
}
audit_log_end(ab);
@ -1124,6 +1143,27 @@ int audit_sockaddr(int len, void *a)
return 0;
}
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;
}
void audit_signal_info(int sig, struct task_struct *t)
{
extern pid_t audit_sig_pid;