linux-kernel - [PATCH 2/2] log out-of-virtual-memory events (was: [RFC] log out-of-virtual-memory events)

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <464ED292.8020202@users.sourceforge.net>
Date:	Sat, 19 May 2007 12:34:01 +0200 (MEST)
From:	Andrea Righi <righiandr@...rs.sourceforge.net>
To:	Bernd Eckenfels <ecki@...a.inka.de>
Cc:	linux-kernel@...r.kernel.org, Rik van Riel <riel@...hat.com>,
	linux-mm@...ck.org, Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: [PATCH 2/2] log out-of-virtual-memory events (was: [RFC] log out-of-virtual-memory
 events)

Bernd Eckenfels wrote:
> In article <464DCC52.7090403@...rs.sourceforge.net> you wrote:
>> +       printk(KERN_INFO
>> +              "out of virtual memory for process %d (%s): total_vm=%lu, uid=%d\n",
>> +               current->pid, current->comm, total_vm, current->uid);
> 
> And align this one with the print_fatal layout:
> 
>        printk(KERN_WARNING
>               "%s/%d process cannot request more virtual memory: total_vm=%lu, uid=%d\n",
>                current->comm, current->pid, total_vm, current->uid);
> 

Depends on print_fatal_signals patch.

---

Print informations about userspace processes that fail to allocate new virtual
memory.

Signed-off-by: Andrea Righi <a.righi@...eca.it>

diff -urpN linux-2.6.22-rc1-mm1/mm/mmap.c linux-2.6.22-rc1-mm1-vm-log-enomem/mm/mmap.c
--- linux-2.6.22-rc1-mm1/mm/mmap.c	2007-05-19 11:25:24.000000000 +0200
+++ linux-2.6.22-rc1-mm1-vm-log-enomem/mm/mmap.c	2007-05-19 11:55:05.000000000 +0200
@@ -77,6 +77,31 @@ int sysctl_overcommit_ratio = 50;	/* def
 int sysctl_max_map_count __read_mostly = DEFAULT_MAX_MAP_COUNT;
 atomic_t vm_committed_space = ATOMIC_INIT(0);
 
+extern int print_fatal_signals;
+
+/*
+ * Print current process informations when it fails to allocate new virtual
+ * memory.
+ */
+static inline void log_vm_enomem(void)
+{
+	unsigned long total_vm = 0;
+	struct mm_struct *mm;
+
+	if (unlikely(!printk_ratelimit()))
+		return;
+
+	task_lock(current);
+	mm = current->mm;
+	if (mm)
+		total_vm = mm->total_vm;
+	task_unlock(current);
+
+	printk(KERN_WARNING
+	       "%s/%d process cannot request more virtual memory: total_vm=%lu, uid=%d\n",
+	       current->comm, current->pid, total_vm, current->uid);
+}
+
 /*
  * Check that a process has enough memory to allocate a new virtual
  * mapping. 0 means there is enough memory for the allocation to
@@ -177,6 +202,9 @@ int __vm_enough_memory(long pages, int c
 error:
 	vm_unacct_memory(pages);
 
+	if (print_fatal_signals)
+		log_vm_enomem();
+
 	return -ENOMEM;
 } 
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/