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Message-Id: <E1LCogq-00008v-SR@ZenIV.linux.org.uk>
Date: Wed, 17 Dec 2008 05:11:20 +0000
From: Al Viro <viro@....linux.org.uk>
To: linux-audit@...hat.com
Cc: linux-kernel@...r.kernel.org
Subject: [PATCH 2/15] sanitize audit_socketcall
* don't bother with allocations
* now that it can't fail, make it return void
Signed-off-by: Al Viro <viro@...iv.linux.org.uk>
---
include/linux/audit.h | 4 +-
kernel/auditsc.c | 66 ++++++++++++++++++++++++++++--------------------
net/socket.c | 4 +--
3 files changed, 41 insertions(+), 33 deletions(-)
diff --git a/include/linux/audit.h b/include/linux/audit.h
index 8f0672d..e59feb9 100644
--- a/include/linux/audit.h
+++ b/include/linux/audit.h
@@ -444,7 +444,7 @@ extern void audit_log_task_context(struct audit_buffer *ab);
extern int __audit_ipc_obj(struct kern_ipc_perm *ipcp);
extern int __audit_ipc_set_perm(unsigned long qbytes, uid_t uid, gid_t gid, mode_t mode);
extern int audit_bprm(struct linux_binprm *bprm);
-extern int audit_socketcall(int nargs, unsigned long *args);
+extern void 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_set_macxattr(const char *name);
@@ -525,7 +525,7 @@ extern int audit_signals;
#define audit_ipc_obj(i) ({ 0; })
#define audit_ipc_set_perm(q,u,g,m) ({ 0; })
#define audit_bprm(p) ({ 0; })
-#define audit_socketcall(n,a) ({ 0; })
+#define audit_socketcall(n,a) ((void)0)
#define audit_fd_pair(n,a) ({ 0; })
#define audit_sockaddr(len, addr) ({ 0; })
#define audit_set_macxattr(n) do { ; } while (0)
diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index aca9ddb..1d53aa8 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -156,12 +156,6 @@ struct audit_aux_data_execve {
struct mm_struct *mm;
};
-struct audit_aux_data_socketcall {
- struct audit_aux_data d;
- int nargs;
- unsigned long args[0];
-};
-
struct audit_aux_data_fd_pair {
struct audit_aux_data d;
int fd[2];
@@ -221,6 +215,14 @@ struct audit_context {
struct audit_tree_refs *trees, *first_trees;
int tree_count;
+ int type;
+ union {
+ struct {
+ int nargs;
+ long args[6];
+ } socketcall;
+ };
+
#if AUDIT_DEBUG
int put_count;
int ino_count;
@@ -1167,6 +1169,27 @@ static void audit_log_execve_info(struct audit_context *context,
kfree(buf);
}
+static void show_special(struct audit_context *context)
+{
+ struct audit_buffer *ab;
+ int i;
+
+ ab = audit_log_start(context, GFP_KERNEL, context->type);
+ if (!ab)
+ return;
+
+ switch (context->type) {
+ case AUDIT_SOCKETCALL: {
+ int nargs = context->socketcall.nargs;
+ audit_log_format(ab, "nargs=%d", nargs);
+ for (i = 0; i < nargs; i++)
+ audit_log_format(ab, " a%d=%lx", i,
+ context->socketcall.args[i]);
+ break; }
+ }
+ audit_log_end(ab);
+}
+
static void audit_log_exit(struct audit_context *context, struct task_struct *tsk)
{
int i, call_panic = 0;
@@ -1311,13 +1334,6 @@ static void audit_log_exit(struct audit_context *context, struct task_struct *ts
audit_log_execve_info(context, &ab, axi);
break; }
- case AUDIT_SOCKETCALL: {
- struct audit_aux_data_socketcall *axs = (void *)aux;
- audit_log_format(ab, "nargs=%d", axs->nargs);
- for (i=0; i<axs->nargs; i++)
- audit_log_format(ab, " a%d=%lx", i, axs->args[i]);
- 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]);
@@ -1327,6 +1343,9 @@ static void audit_log_exit(struct audit_context *context, struct task_struct *ts
audit_log_end(ab);
}
+ if (context->type)
+ show_special(context);
+
if (context->sockaddr_len) {
ab = audit_log_start(context, GFP_KERNEL, AUDIT_SOCKADDR);
if (ab) {
@@ -1604,6 +1623,7 @@ void audit_syscall_exit(int valid, long return_code)
context->target_pid = 0;
context->target_sid = 0;
context->sockaddr_len = 0;
+ context->type = 0;
kfree(context->filterkey);
context->filterkey = NULL;
tsk->audit_context = context;
@@ -2292,27 +2312,17 @@ int audit_bprm(struct linux_binprm *bprm)
* @nargs: number of args
* @args: args array
*
- * Returns 0 for success or NULL context or < 0 on error.
*/
-int audit_socketcall(int nargs, unsigned long *args)
+void audit_socketcall(int nargs, unsigned long *args)
{
- struct audit_aux_data_socketcall *ax;
struct audit_context *context = current->audit_context;
if (likely(!context || context->dummy))
- return 0;
-
- ax = kmalloc(sizeof(*ax) + nargs * sizeof(unsigned long), GFP_KERNEL);
- if (!ax)
- return -ENOMEM;
-
- ax->nargs = nargs;
- memcpy(ax->args, args, nargs * sizeof(unsigned long));
+ return;
- ax->d.type = AUDIT_SOCKETCALL;
- ax->d.next = context->aux;
- context->aux = (void *)ax;
- return 0;
+ context->type = AUDIT_SOCKETCALL;
+ context->socketcall.nargs = nargs;
+ memcpy(context->socketcall.args, args, nargs * sizeof(unsigned long));
}
/**
diff --git a/net/socket.c b/net/socket.c
index 92764d8..aba5a50 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -2066,9 +2066,7 @@ asmlinkage long sys_socketcall(int call, unsigned long __user *args)
if (copy_from_user(a, args, nargs[call]))
return -EFAULT;
- err = audit_socketcall(nargs[call] / sizeof(unsigned long), a);
- if (err)
- return err;
+ audit_socketcall(nargs[call] / sizeof(unsigned long), a);
a0 = a[0];
a1 = a[1];
--
1.5.6.5
--
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