Commit 17a9be31 authored May 04, 2017 by Stafford Horne

initramfs: Always do fput() and load modules after rootfs populate



In OpenRISC we do not have a bootloader passed initrd, but the built in
initramfs does contain the /init and other binaries, including modules.
The previous commit 08865514 ("initramfs: finish fput() before
accessing any binary from initramfs") made a change to only call fput()
if the bootloader initrd was available, this caused intermittent crashes
for OpenRISC.

This patch changes the fput() to happen unconditionally if any rootfs is
loaded. Also, I added some comments to make it a bit more clear why we
call unpack_to_rootfs() multiple times.

Fixes: 08865514 ("initramfs: finish fput() before accessing any binary from initramfs")
Cc: stable@vger.kernel.org
Cc: Lokesh Vutla <lokeshvutla@ti.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Acked-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Stafford Horne <shorne@gmail.com>

parent a351e9b9

init/initramfs.c

+9 −6

Original line number	Diff line number	Diff line
		@@ -608,9 +608,11 @@ static void __init clean_rootfs(void)

		static int __init populate_rootfs(void)
		{
		/* Load the built in initramfs */
		char *err = unpack_to_rootfs(__initramfs_start, __initramfs_size);
		if (err)
		panic("%s", err); /* Failed to decompress INTERNAL initramfs */
		/* If available load the bootloader supplied initrd */
		if (initrd_start) {
		#ifdef CONFIG_BLK_DEV_RAM
		int fd;
		@@ -648,13 +650,14 @@ 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.
		*/
		load_default_modules();
		}

		return 0;
		}
		rootfs_initcall(populate_rootfs);