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authorFrederic Weisbecker <fweisbec@gmail.com>2010-03-30 02:14:26 +0200
committerFrederic Weisbecker <fweisbec@gmail.com>2010-04-09 16:32:02 +0200
commit34aacb2920667d405a8df15968b7f71ba46c8f18 (patch)
tree7ff58a62c025ce5aa15279176cbb22b85b341382 /fs/proc
parent87df842410ce5a86fdca9fbec0dba80d2aa88b6f (diff)
downloadlinux-34aacb2920667d405a8df15968b7f71ba46c8f18.tar.bz2
procfs: Use generic_file_llseek in /proc/kcore
/proc/kcore has no llseek and then falls down to use default_llseek. This is racy against read_kcore() 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>
Diffstat (limited to 'fs/proc')
-rw-r--r--fs/proc/kcore.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/proc/kcore.c b/fs/proc/kcore.c
index b442dac8f5f9..396453200ef4 100644
--- a/fs/proc/kcore.c
+++ b/fs/proc/kcore.c
@@ -557,6 +557,7 @@ static int open_kcore(struct inode *inode, struct file *filp)
static const struct file_operations proc_kcore_operations = {
.read = read_kcore,
.open = open_kcore,
+ .llseek = generic_file_llseek,
};
#ifdef CONFIG_MEMORY_HOTPLUG