Commit 54c7a891 authored May 13, 2019 by Christoph Hellwig Committed by Linus Torvalds May 14, 2019

initramfs: free initrd memory if opening /initrd.image fails

Patch series "initramfs tidyups".

I've spent some time chasing down behavior in initramfs and found
plenty of opportunity to improve the code.  A first stab on that is
contained in this series.

This patch (of 7):

We free the initrd memory for all successful or error cases except for the
case where opening /initrd.image fails, which looks like an oversight.

Steven said:

: This also changes the behaviour when CONFIG_INITRAMFS_FORCE is enabled
: - specifically it means that the initrd is freed (previously it was
: ignored and never freed).  But that seems like reasonable behaviour and
: the previous behaviour looks like another oversight.

Link: http://lkml.kernel.org/r/20190213174621.29297-3-hch@lst.de


Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Steven Price <steven.price@arm.com>
Acked-by: Mike Rapoport <rppt@linux.ibm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>	[arm64]
Cc: Geert Uytterhoeven <geert@linux-m68k.org>	[m68k]
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Russell King <linux@armlinux.org.uk>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Guan Xuetao <gxt@pku.edu.cn>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

parent 1df3a339

init/initramfs.c

+6 −8

Original line number	Diff line number	Diff line
		@@ -612,13 +612,12 @@ static int __init populate_rootfs(void)
		printk(KERN_INFO "Trying to unpack rootfs image as initramfs...\n");
		err = unpack_to_rootfs((char *)initrd_start,
		initrd_end - initrd_start);
		if (!err) {
		free_initrd();
		if (!err)
		goto done;
		} else {

		clean_rootfs();
		unpack_to_rootfs(__initramfs_start, __initramfs_size);
		}

		printk(KERN_INFO "rootfs image is not initramfs (%s)"
		"; looks like an initrd\n", err);
		fd = ksys_open("/initrd.image",
		@@ -632,7 +631,6 @@ static int __init populate_rootfs(void)
		written, initrd_end - initrd_start);

		ksys_close(fd);
		free_initrd();
		}
		done:
		/* empty statement */;
		@@ -642,9 +640,9 @@ static int __init populate_rootfs(void)
		initrd_end - initrd_start);
		if (err)
		printk(KERN_EMERG "Initramfs unpacking failed: %s\n", err);
		free_initrd();
		#endif
		}
		free_initrd();
		flush_delayed_fput();
		return 0;
		}

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