linux-kernel - [PATCH] initramfs: cleanup incomplete rootfs

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Message-Id: <20181022134048.19693-1-david.engraf@sysgo.com>
Date:   Mon, 22 Oct 2018 15:40:48 +0200
From:   David Engraf <david.engraf@...go.com>
To:     linux@...inikbrodowski.net, akpm@...ux-foundation.org,
        pombredanne@...b.com, gregkh@...uxfoundation.org, arnd@...db.de,
        luc.vanoostenryck@...il.com
Cc:     linux-kernel@...r.kernel.org, David Engraf <david.engraf@...go.com>
Subject: [PATCH] initramfs: cleanup incomplete rootfs

Unpacking an external initrd may fail e.g. not enough memory. This leads
to an incomplete rootfs because some files might be extracted already.
Fixed by cleaning the rootfs so the kernel is not using an incomplete
rootfs.

Signed-off-by: David Engraf <david.engraf@...go.com>
---
 init/initramfs.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/init/initramfs.c b/init/initramfs.c
index 640557788026..aa3a46cfcb4e 100644
--- a/init/initramfs.c
+++ b/init/initramfs.c
@@ -548,7 +548,6 @@ static void __init free_initrd(void)
 	initrd_end = 0;
 }
 
-#ifdef CONFIG_BLK_DEV_RAM
 #define BUF_SIZE 1024
 static void __init clean_rootfs(void)
 {
@@ -595,7 +594,6 @@ static void __init clean_rootfs(void)
 	ksys_close(fd);
 	kfree(buf);
 }
-#endif
 
 static int __init populate_rootfs(void)
 {
@@ -638,8 +636,10 @@ static int __init populate_rootfs(void)
 		printk(KERN_INFO "Unpacking initramfs...\n");
 		err = unpack_to_rootfs((char *)initrd_start,
 			initrd_end - initrd_start);
-		if (err)
+		if (err) {
 			printk(KERN_EMERG "Initramfs unpacking failed: %s\n", err);
+			clean_rootfs();
+		}
 		free_initrd();
 #endif
 	}
-- 
2.17.1