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Commit 9df7fa16 authored by Al Viro's avatar Al Viro
Browse files

acct: serialize acct_on() 



brute-force - on a global mutex that isn't nested into anything.

Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
parent 795a2f22

kernel/acct.c

+4 −0
Original line number Diff line number Diff line
@@ -241,6 +241,8 @@ static int acct_on(struct filename *pathname) 
	return 0;

}



static DEFINE_MUTEX(acct_on_mutex);



/**

 * sys_acct - enable/disable process accounting

 * @name: file name for accounting records or NULL to shutdown accounting
@@ -263,7 +265,9 @@ SYSCALL_DEFINE1(acct, const char __user *, name) 
		struct filename *tmp = getname(name);

		if (IS_ERR(tmp))

			return PTR_ERR(tmp);

		mutex_lock(&acct_on_mutex);

		error = acct_on(tmp);

		mutex_unlock(&acct_on_mutex);

		putname(tmp);

	} else {

		struct bsd_acct_struct *acct;