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authorKaiGai Kohei <kaigai@ak.jp.nec.com>2006-06-25 16:49:25 +0400
committerLinus Torvalds <torvalds@g5.osdl.org>2006-06-25 21:01:25 +0400
commitf6ec29a42d7ac3b309a9cef179b686d23986ab98 (patch)
tree5150d4f403833ac18b468bd0e0e0a9a7cdd9f4be /kernel/acct.c
parent0e4648141af02331f21aabcd34940c70f09a2d04 (diff)
downloadlinux-f6ec29a42d7ac3b309a9cef179b686d23986ab98.tar.xz
[PATCH] pacct: avoidance to refer the last thread as a representation of the process
When pacct facility generate an 'ac_flag' field in accounting record, it refers a task_struct of the thread which died last in the process. But any other task_structs are ignored. Therefore, pacct facility drops ASU flag even if root-privilege operations are used by any other threads except the last one. In addition, AFORK flag is always set when the thread of group-leader didn't die last, although this process has called execve() after fork(). We have a same matter in ac_exitcode. The recorded ac_exitcode is an exit code of the last thread in the process. There is a possibility this exitcode is not the group leader's one.
Diffstat (limited to 'kernel/acct.c')
-rw-r--r--kernel/acct.c42
1 files changed, 24 insertions, 18 deletions
diff --git a/kernel/acct.c b/kernel/acct.c
index b35263137824..4c85fdf615da 100644
--- a/kernel/acct.c
+++ b/kernel/acct.c
@@ -75,7 +75,7 @@ int acct_parm[3] = {4, 2, 30};
/*
* External references and all of the globals.
*/
-static void do_acct_process(long, struct file *);
+static void do_acct_process(struct file *);
/*
* This structure is used so that all the data protected by lock
@@ -196,7 +196,7 @@ static void acct_file_reopen(struct file *file)
if (old_acct) {
mnt_unpin(old_acct->f_vfsmnt);
spin_unlock(&acct_globals.lock);
- do_acct_process(0, old_acct);
+ do_acct_process(old_acct);
filp_close(old_acct, NULL);
spin_lock(&acct_globals.lock);
}
@@ -419,7 +419,7 @@ static u32 encode_float(u64 value)
/*
* do_acct_process does all actual work. Caller holds the reference to file.
*/
-static void do_acct_process(long exitcode, struct file *file)
+static void do_acct_process(struct file *file)
{
struct pacct_struct *pacct = &current->signal->pacct;
acct_t ac;
@@ -496,17 +496,10 @@ static void do_acct_process(long exitcode, struct file *file)
old_encode_dev(tty_devnum(current->signal->tty)) : 0;
read_unlock(&tasklist_lock);
- ac.ac_flag = 0;
- if (current->flags & PF_FORKNOEXEC)
- ac.ac_flag |= AFORK;
- if (current->flags & PF_SUPERPRIV)
- ac.ac_flag |= ASU;
- if (current->flags & PF_DUMPCORE)
- ac.ac_flag |= ACORE;
- if (current->flags & PF_SIGNALED)
- ac.ac_flag |= AXSIG;
spin_lock(&current->sighand->siglock);
+ ac.ac_flag = pacct->ac_flag;
ac.ac_mem = encode_comp_t(pacct->ac_mem);
+ ac.ac_exitcode = pacct->ac_exitcode;
spin_unlock(&current->sighand->siglock);
ac.ac_io = encode_comp_t(0 /* current->io_usage */); /* %% */
ac.ac_rw = encode_comp_t(ac.ac_io / 1024);
@@ -515,7 +508,6 @@ static void do_acct_process(long exitcode, struct file *file)
ac.ac_majflt = encode_comp_t(current->signal->maj_flt +
current->maj_flt);
ac.ac_swaps = encode_comp_t(0);
- ac.ac_exitcode = exitcode;
/*
* Kernel segment override to datasegment and write it
@@ -544,13 +536,15 @@ void acct_init_pacct(struct pacct_struct *pacct)
/**
* acct_collect - collect accounting information into pacct_struct
+ * @exitcode: task exit code
+ * @group_dead: not 0, if this thread is the last one in the process.
*/
-void acct_collect(void)
+void acct_collect(long exitcode, int group_dead)
{
struct pacct_struct *pacct = &current->signal->pacct;
unsigned long vsize = 0;
- if (current->mm) {
+ if (group_dead && current->mm) {
struct vm_area_struct *vma;
down_read(&current->mm->mmap_sem);
vma = current->mm->mmap;
@@ -562,7 +556,19 @@ void acct_collect(void)
}
spin_lock(&current->sighand->siglock);
- pacct->ac_mem = vsize / 1024;
+ if (group_dead)
+ pacct->ac_mem = vsize / 1024;
+ if (thread_group_leader(current)) {
+ pacct->ac_exitcode = exitcode;
+ if (current->flags & PF_FORKNOEXEC)
+ pacct->ac_flag |= AFORK;
+ }
+ if (current->flags & PF_SUPERPRIV)
+ pacct->ac_flag |= ASU;
+ if (current->flags & PF_DUMPCORE)
+ pacct->ac_flag |= ACORE;
+ if (current->flags & PF_SIGNALED)
+ pacct->ac_flag |= AXSIG;
spin_unlock(&current->sighand->siglock);
}
@@ -572,7 +578,7 @@ void acct_collect(void)
*
* handles process accounting for an exiting task
*/
-void acct_process(long exitcode)
+void acct_process()
{
struct file *file = NULL;
@@ -591,7 +597,7 @@ void acct_process(long exitcode)
get_file(file);
spin_unlock(&acct_globals.lock);
- do_acct_process(exitcode, file);
+ do_acct_process(file);
fput(file);
}