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authorFrederic Weisbecker <fweisbec@gmail.com>2010-03-30 02:33:36 +0200
committerFrederic Weisbecker <fweisbec@gmail.com>2010-04-09 17:23:24 +0200
commit73296bc611cee009f3be6b451e827d1425b9c10f (patch)
tree553af58153a05e6a6cc43d4dbcf5acdf6fc3f4c8
parent41775e29a74ed825496c975ba19c7661e15f0523 (diff)
procfs: Use generic_file_llseek in /proc/vmcore
/proc/vmcore has no llseek and then falls down to use default_llseek. This is racy against read_vmcore() that directly manipulates fpos but it doesn't hold the bkl there so using it in llseek doesn't protect anything. Let's use generic_file_llseek() instead. Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Acked-by: Arnd Bergmann <arnd@arndb.de> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Ingo Molnar <mingo@elte.hu> Cc: John Kacur <jkacur@redhat.com> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Al Viro <viro@ZenIV.linux.org.uk>
-rw-r--r--fs/proc/vmcore.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/proc/vmcore.c b/fs/proc/vmcore.c
index 0872afa58d39..00ef6046d8d2 100644
--- a/fs/proc/vmcore.c
+++ b/fs/proc/vmcore.c
@@ -162,6 +162,7 @@ static ssize_t read_vmcore(struct file *file, char __user *buffer,
static const struct file_operations proc_vmcore_operations = {
.read = read_vmcore,
+ .llseek = generic_file_llseek,
};
static struct vmcore* __init get_new_element(void)