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authorLokesh Vutla <lokeshvutla@ti.com>2017-02-28 01:28:12 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2017-02-28 05:43:46 +0300
commit08865514805d2de8e7002fa8149c5de3e391f412 (patch)
treef366ebfda75357b9408688ce477bd2097a7cc6f3 /init/initramfs.c
parent7bcae82621df080a35cb5e708ef333a821effd96 (diff)
downloadlinux-08865514805d2de8e7002fa8149c5de3e391f412.tar.xz
initramfs: finish fput() before accessing any binary from initramfs
Commit 4a9d4b024a31 ("switch fput to task_work_add") implements a schedule_work() for completing fput(), but did not guarantee calling __fput() after unpacking initramfs. Because of this, there is a possibility that during boot a driver can see ETXTBSY when it tries to load a binary from initramfs as fput() is still pending on that binary. This patch makes sure that fput() is completed after unpacking initramfs and removes the call to flush_delayed_fput() in kernel_init() which happens very late after unpacking initramfs. Link: http://lkml.kernel.org/r/20170201140540.22051-1-lokeshvutla@ti.com Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com> Reported-by: Murali Karicheri <m-karicheri2@ti.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Tero Kristo <t-kristo@ti.com> Cc: Sekhar Nori <nsekhar@ti.com> Cc: Nishanth Menon <nm@ti.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'init/initramfs.c')
-rw-r--r--init/initramfs.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/init/initramfs.c b/init/initramfs.c
index b32ad7d97ac9..981f286c1d16 100644
--- a/init/initramfs.c
+++ b/init/initramfs.c
@@ -18,6 +18,7 @@
#include <linux/dirent.h>
#include <linux/syscalls.h>
#include <linux/utime.h>
+#include <linux/file.h>
static ssize_t __init xwrite(int fd, const char *p, size_t count)
{
@@ -647,6 +648,7 @@ static int __init populate_rootfs(void)
printk(KERN_EMERG "Initramfs unpacking failed: %s\n", err);
free_initrd();
#endif
+ flush_delayed_fput();
/*
* Try loading default modules from initramfs. This gives
* us a chance to load before device_initcalls.