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kernel: audit: beautify code, for extern function, better to check its parameters by itself

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__audit_socketcall is an extern function.
  better to check its parameters by itself.

    also can return error code, when fail (find invalid parameters).
    also use macro instead of real hard code number
    also give related comments for it.

Signed-off-by: Chen Gang <gang.chen@asianux.com>
[eparis: fix the return value when !CONFIG_AUDIT]
Signed-off-by: Eric Paris <eparis@redhat.com>
This commit is contained in:
Chen Gang
2013-04-07 16:55:23 +08:00
committed by Eric Paris
parent 65ada7bc02
commit 2950fa9d32
3 changed files with 21 additions and 10 deletions
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kernel/auditsc.c
+6 -3
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@@ -226,7 +226,7 @@ struct audit_context {
union {
struct {
int nargs;
long args[6];
long args[AUDITSC_ARGS];
} socketcall;
struct {
kuid_t uid;
@@ -2491,17 +2491,20 @@ int __audit_bprm(struct linux_binprm *bprm)
/**
* audit_socketcall - record audit data for sys_socketcall
* @nargs: number of args
* @nargs: number of args, which should not be more than AUDITSC_ARGS.
* @args: args array
*
*/
void __audit_socketcall(int nargs, unsigned long *args)
int __audit_socketcall(int nargs, unsigned long *args)
{
struct audit_context *context = current->audit_context;
if (nargs <= 0 || nargs > AUDITSC_ARGS || !args)
return -EINVAL;
context->type = AUDIT_SOCKETCALL;
context->socketcall.nargs = nargs;
memcpy(context->socketcall.args, args, nargs * sizeof(unsigned long));
return 0;
}
/**