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From: Michal Hocko <mhocko@kernel.org>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Christoph Hellwig <hch@lst.de>,
	Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>,
	Al Viro <viro@zeniv.linux.org.uk>, <linux-mm@kvack.org>,
	<linux-fsdevel@vger.kernel.org>,
	LKML <linux-kernel@vger.kernel.org>,
	Michal Hocko <mhocko@suse.com>
Subject: [PATCH 3/3] vmalloc: back of when the current is killed
Date: Wed,  1 Feb 2017 10:27:06 +0100	[thread overview]
Message-ID: <20170201092706.9966-4-mhocko@kernel.org> (raw)
In-Reply-To: <20170201092706.9966-1-mhocko@kernel.org>

From: Michal Hocko <mhocko@suse.com>

__vmalloc_area_node allocates pages to cover the requested vmalloc size.
This can be a lot of memory. If the current task is killed by the OOM
killer, and thus has an unlimited access to memory reserves, it can
consume all the memory theoretically. Fix this by checking for
fatal_signal_pending and back off early.

Signed-off-by: Michal Hocko <mhocko@suse.com>
---
 mm/vmalloc.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index d89034a393f2..011b446f8758 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -1642,6 +1642,11 @@ static void *__vmalloc_area_node(struct vm_struct *area, gfp_t gfp_mask,
 	for (i = 0; i < area->nr_pages; i++) {
 		struct page *page;
 
+		if (fatal_signal_pending(current)) {
+			area->nr_pages = i;
+			goto fail;
+		}
+
 		if (node == NUMA_NO_NODE)
 			page = alloc_page(alloc_mask);
 		else
-- 
2.11.0

WARNING: multiple messages have this Message-ID
From: Michal Hocko <mhocko@kernel.org>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Christoph Hellwig <hch@lst.de>,
	Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>,
	Al Viro <viro@zeniv.linux.org.uk>, <linux-mm@kvack.org>,
	<linux-fsdevel@vger.kernel.org>,
	LKML <linux-kernel@vger.kernel.org>,
	Michal Hocko <mhocko@suse.com>
Subject: [PATCH 3/3] vmalloc: back of when the current is killed
Date: Wed,  1 Feb 2017 10:27:06 +0100	[thread overview]
Message-ID: <20170201092706.9966-4-mhocko@kernel.org> (raw)
In-Reply-To: <20170201092706.9966-1-mhocko@kernel.org>

From: Michal Hocko <mhocko@suse.com>

__vmalloc_area_node allocates pages to cover the requested vmalloc size.
This can be a lot of memory. If the current task is killed by the OOM
killer, and thus has an unlimited access to memory reserves, it can
consume all the memory theoretically. Fix this by checking for
fatal_signal_pending and back off early.

Signed-off-by: Michal Hocko <mhocko@suse.com>
---
 mm/vmalloc.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index d89034a393f2..011b446f8758 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -1642,6 +1642,11 @@ static void *__vmalloc_area_node(struct vm_struct *area, gfp_t gfp_mask,
 	for (i = 0; i < area->nr_pages; i++) {
 		struct page *page;
 
+		if (fatal_signal_pending(current)) {
+			area->nr_pages = i;
+			goto fail;
+		}
+
 		if (node == NUMA_NO_NODE)
 			page = alloc_page(alloc_mask);
 		else
-- 
2.11.0

--
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WARNING: multiple messages have this Message-ID
From: Michal Hocko <mhocko@kernel.org>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Christoph Hellwig <hch@lst.de>,
	Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>,
	Al Viro <viro@zeniv.linux.org.uk>,
	linux-mm@kvack.org, linux-fsdevel@vger.kernel.org,
	LKML <linux-kernel@vger.kernel.org>,
	Michal Hocko <mhocko@suse.com>
Subject: [PATCH 3/3] vmalloc: back of when the current is killed
Date: Wed,  1 Feb 2017 10:27:06 +0100	[thread overview]
Message-ID: <20170201092706.9966-4-mhocko@kernel.org> (raw)
In-Reply-To: <20170201092706.9966-1-mhocko@kernel.org>

From: Michal Hocko <mhocko@suse.com>

__vmalloc_area_node allocates pages to cover the requested vmalloc size.
This can be a lot of memory. If the current task is killed by the OOM
killer, and thus has an unlimited access to memory reserves, it can
consume all the memory theoretically. Fix this by checking for
fatal_signal_pending and back off early.

Signed-off-by: Michal Hocko <mhocko@suse.com>
---
 mm/vmalloc.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index d89034a393f2..011b446f8758 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -1642,6 +1642,11 @@ static void *__vmalloc_area_node(struct vm_struct *area, gfp_t gfp_mask,
 	for (i = 0; i < area->nr_pages; i++) {
 		struct page *page;
 
+		if (fatal_signal_pending(current)) {
+			area->nr_pages = i;
+			goto fail;
+		}
+
 		if (node == NUMA_NO_NODE)
 			page = alloc_page(alloc_mask);
 		else
-- 
2.11.0

--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org.  For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>

  parent reply	other threads:[~2017-02-01  9:27 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-02-01  9:27 [PATCH 0/3] fix few OOM victim allocation runaways Michal Hocko
2017-02-01  9:27 ` Michal Hocko
2017-02-01  9:27 ` Michal Hocko
2017-02-01  9:27 ` [PATCH 1/3] fs: break out of iomap_file_buffered_write on fatal signals Michal Hocko
2017-02-01  9:27   ` Michal Hocko
2017-02-01  9:27   ` Michal Hocko
2017-02-01  9:28   ` Christoph Hellwig
2017-02-01  9:28     ` Christoph Hellwig
2017-02-01  9:27 ` [PATCH 2/3] mm, fs: check for fatal signals in do_generic_file_read Michal Hocko
2017-02-01  9:27   ` Michal Hocko
2017-02-01  9:27   ` Michal Hocko
2017-02-01  9:28   ` Christoph Hellwig
2017-02-01  9:28     ` Christoph Hellwig
2017-02-01  9:27 ` Michal Hocko [this message]
2017-02-01  9:27   ` [PATCH 3/3] vmalloc: back of when the current is killed Michal Hocko
2017-02-01  9:27   ` Michal Hocko
2017-02-01  9:28   ` Christoph Hellwig
2017-02-01  9:28     ` Christoph Hellwig
2017-02-01 11:49 ` [PATCH 0/3] fix few OOM victim allocation runaways Tetsuo Handa
2017-02-01 11:49   ` Tetsuo Handa

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