bsd_acct: using task_struct->tgid is not right in pid-namespaces

[sfrench/cifs-2.6.git] / kernel / acct.c

diff --git a/kernel/acct.c b/kernel/acct.c
index 521dfa53cb999657ce8971494f1f573d88d55df7..91e1cfd734d286f922597108e54065ef691d31b2 100644 (file)
--- a/kernel/acct.c
+++ b/kernel/acct.c
@@ -58,6 +58,7 @@
 #include <asm/uaccess.h>
 #include <asm/div64.h>
 #include <linux/blkdev.h> /* sector_div */
+#include <linux/pid_namespace.h>
 
 /*
  * These constants control the amount of freespace that suspend and
@@ -74,7 +75,7 @@ int acct_parm[3] = {4, 2, 30};
 /*
  * External references and all of the globals.
  */
-static void do_acct_process(struct file *);
+static void do_acct_process(struct pid_namespace *ns, struct file *);
 
 /*
  * This structure is used so that all the data protected by lock
@@ -86,6 +87,7 @@ struct acct_glbs {
        volatile int            active;
        volatile int            needcheck;
        struct file             *file;
+       struct pid_namespace    *ns;
        struct timer_list       timer;
 };
 
@@ -175,9 +177,11 @@ out:
 static void acct_file_reopen(struct file *file)
 {
        struct file *old_acct = NULL;
+       struct pid_namespace *old_ns = NULL;
 
        if (acct_globals.file) {
                old_acct = acct_globals.file;
+               old_ns = acct_globals.ns;
                del_timer(&acct_globals.timer);
                acct_globals.active = 0;
                acct_globals.needcheck = 0;
@@ -185,6 +189,7 @@ static void acct_file_reopen(struct file *file)
        }
        if (file) {
                acct_globals.file = file;
+               acct_globals.ns = get_pid_ns(task_active_pid_ns(current));
                acct_globals.needcheck = 0;
                acct_globals.active = 1;
                /* It's been deleted if it was used before so this is safe */
@@ -196,8 +201,9 @@ static void acct_file_reopen(struct file *file)
        if (old_acct) {
                mnt_unpin(old_acct->f_path.mnt);
                spin_unlock(&acct_globals.lock);
-               do_acct_process(old_acct);
+               do_acct_process(old_ns, old_acct);
                filp_close(old_acct, NULL);
+               put_pid_ns(old_ns);
                spin_lock(&acct_globals.lock);
        }
 }
@@ -419,7 +425,7 @@ static u32 encode_float(u64 value)
 /*
  *  do_acct_process does all actual work. Caller holds the reference to file.
  */
-static void do_acct_process(struct file *file)
+static void do_acct_process(struct pid_namespace *ns, struct file *file)
 {
        struct pacct_struct *pacct = &current->signal->pacct;
        acct_t ac;
@@ -481,8 +487,10 @@ static void do_acct_process(struct file *file)
        ac.ac_gid16 = current->gid;
 #endif
 #if ACCT_VERSION==3
-       ac.ac_pid = current->tgid;
-       ac.ac_ppid = current->real_parent->tgid;
+       ac.ac_pid = task_tgid_nr_ns(current, ns);
+       rcu_read_lock();
+       ac.ac_ppid = task_tgid_nr_ns(rcu_dereference(current->real_parent), ns);
+       rcu_read_unlock();
 #endif
 
        spin_lock_irq(&current->sighand->siglock);
@@ -578,6 +586,7 @@ void acct_collect(long exitcode, int group_dead)
 void acct_process(void)
 {
        struct file *file = NULL;
+       struct pid_namespace *ns;
 
        /*
         * accelerate the common fastpath:
@@ -592,8 +601,10 @@ void acct_process(void)
                return;
        }
        get_file(file);
+       ns = get_pid_ns(acct_globals.ns);
        spin_unlock(&acct_globals.lock);
 
-       do_acct_process(file);
+       do_acct_process(ns, file);
        fput(file);
+       put_pid_ns(ns);
 }