diff options
author | Filipe David Borba Manana <fdmanana@gmail.com> | 2014-01-12 02:22:46 +0000 |
---|---|---|
committer | Chris Mason <clm@fb.com> | 2014-01-28 13:20:31 -0800 |
commit | 14a958e678cd77cae475b60ca46c0797b1c006a1 (patch) | |
tree | 94bf5974065fc34d230e5c036b14f611389d621b /fs | |
parent | c57c2b3ed248b3f1712e4172eb85b361199582f2 (diff) | |
download | op-kernel-dev-14a958e678cd77cae475b60ca46c0797b1c006a1.zip op-kernel-dev-14a958e678cd77cae475b60ca46c0797b1c006a1.tar.gz |
Btrfs: fix btrfs boot when compiled as built-in
After the change titled "Btrfs: add support for inode properties", if
btrfs was built-in the kernel (i.e. not as a module), it would cause a
kernel panic, as reported recently by Fengguang:
[ 2.024722] BUG: unable to handle kernel NULL pointer dereference at (null)
[ 2.027814] IP: [<ffffffff81501594>] crc32c+0xc/0x6b
[ 2.028684] PGD 0
[ 2.028684] Oops: 0000 [#1] SMP
[ 2.028684] Modules linked in:
[ 2.028684] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 3.13.0-rc7-04795-ga7b57c2 #1
[ 2.028684] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 2.028684] task: ffff88000edba100 ti: ffff88000edd6000 task.ti: ffff88000edd6000
[ 2.028684] RIP: 0010:[<ffffffff81501594>] [<ffffffff81501594>] crc32c+0xc/0x6b
[ 2.028684] RSP: 0000:ffff88000edd7e58 EFLAGS: 00010246
[ 2.028684] RAX: 0000000000000000 RBX: ffffffff82295550 RCX: 0000000000000000
[ 2.028684] RDX: 0000000000000011 RSI: ffffffff81efe393 RDI: 00000000fffffffe
[ 2.028684] RBP: ffff88000edd7e60 R08: 0000000000000003 R09: 0000000000015d20
[ 2.028684] R10: ffffffff81ef225e R11: ffffffff811b0222 R12: ffffffffffffffff
[ 2.028684] R13: 0000000000000239 R14: 0000000000000000 R15: 0000000000000000
[ 2.028684] FS: 0000000000000000(0000) GS:ffff88000fa00000(0000) knlGS:0000000000000000
[ 2.028684] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[ 2.028684] CR2: 0000000000000000 CR3: 000000000220c000 CR4: 00000000000006f0
[ 2.028684] Stack:
[ 2.028684] ffffffff82295550 ffff88000edd7e80 ffffffff8238af62 ffffffff8238ac05
[ 2.028684] 0000000000000000 ffff88000edd7e98 ffffffff8238ac0f ffffffff8238ac05
[ 2.028684] ffff88000edd7f08 ffffffff810002ba ffff88000edd7f00 ffffffff810e2404
[ 2.028684] Call Trace:
[ 2.028684] [<ffffffff8238af62>] btrfs_props_init+0x4f/0x96
[ 2.028684] [<ffffffff8238ac05>] ? ftrace_define_fields_btrfs_space_reservation+0x145/0x145
[ 2.028684] [<ffffffff8238ac0f>] init_btrfs_fs+0xa/0xf0
[ 2.028684] [<ffffffff8238ac05>] ? ftrace_define_fields_btrfs_space_reservation+0x145/0x145
[ 2.028684] [<ffffffff810002ba>] do_one_initcall+0xa4/0x13a
[ 2.028684] [<ffffffff810e2404>] ? parse_args+0x25f/0x33d
[ 2.028684] [<ffffffff8234cf75>] kernel_init_freeable+0x1aa/0x230
[ 2.028684] [<ffffffff8234c785>] ? do_early_param+0x88/0x88
[ 2.028684] [<ffffffff819f61b5>] ? rest_init+0x89/0x89
[ 2.028684] [<ffffffff819f61c3>] kernel_init+0xe/0x109
The issue here is that the initialization function of btrfs (super.c:init_btrfs_fs)
started using crc32c (from lib/libcrc32c.c). But when it needs to call crc32c (as
part of the properties initialization routine), the libcrc32c is not yet initialized,
so crc32c derreferenced a NULL pointer (lib/libcrc32c.c:tfm), causing the kernel
panic on boot.
The approach to fix this is to use crypto component directly to use its crc32c (which
is basically what lib/libcrc32c.c is, a wrapper around crypto). This is what ext4 is
doing as well, it uses crypto directly to get crc32c functionality.
Verified this works both when btrfs is built-in and when it's loadable kernel module.
Signed-off-by: Filipe David Borba Manana <fdmanana@gmail.com>
Signed-off-by: Josef Bacik <jbacik@fb.com>
Signed-off-by: Chris Mason <clm@fb.com>
Diffstat (limited to 'fs')
-rw-r--r-- | fs/btrfs/Kconfig | 3 | ||||
-rw-r--r-- | fs/btrfs/Makefile | 2 | ||||
-rw-r--r-- | fs/btrfs/extent-tree.c | 6 | ||||
-rw-r--r-- | fs/btrfs/hash.c | 50 | ||||
-rw-r--r-- | fs/btrfs/hash.h | 11 | ||||
-rw-r--r-- | fs/btrfs/super.c | 10 |
6 files changed, 73 insertions, 9 deletions
diff --git a/fs/btrfs/Kconfig b/fs/btrfs/Kconfig index aa976ec..a66768e 100644 --- a/fs/btrfs/Kconfig +++ b/fs/btrfs/Kconfig @@ -1,6 +1,7 @@ config BTRFS_FS tristate "Btrfs filesystem support" - select LIBCRC32C + select CRYPTO + select CRYPTO_CRC32C select ZLIB_INFLATE select ZLIB_DEFLATE select LZO_COMPRESS diff --git a/fs/btrfs/Makefile b/fs/btrfs/Makefile index af7f000..f341a98 100644 --- a/fs/btrfs/Makefile +++ b/fs/btrfs/Makefile @@ -9,7 +9,7 @@ btrfs-y += super.o ctree.o extent-tree.o print-tree.o root-tree.o dir-item.o \ export.o tree-log.o free-space-cache.o zlib.o lzo.o \ compression.o delayed-ref.o relocation.o delayed-inode.o scrub.o \ reada.o backref.o ulist.o qgroup.o send.o dev-replace.o raid56.o \ - uuid-tree.o props.o + uuid-tree.o props.o hash.o btrfs-$(CONFIG_BTRFS_FS_POSIX_ACL) += acl.o btrfs-$(CONFIG_BTRFS_FS_CHECK_INTEGRITY) += check-integrity.o diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c index b532259..db1e32f 100644 --- a/fs/btrfs/extent-tree.c +++ b/fs/btrfs/extent-tree.c @@ -1074,11 +1074,11 @@ static u64 hash_extent_data_ref(u64 root_objectid, u64 owner, u64 offset) __le64 lenum; lenum = cpu_to_le64(root_objectid); - high_crc = crc32c(high_crc, &lenum, sizeof(lenum)); + high_crc = btrfs_crc32c(high_crc, &lenum, sizeof(lenum)); lenum = cpu_to_le64(owner); - low_crc = crc32c(low_crc, &lenum, sizeof(lenum)); + low_crc = btrfs_crc32c(low_crc, &lenum, sizeof(lenum)); lenum = cpu_to_le64(offset); - low_crc = crc32c(low_crc, &lenum, sizeof(lenum)); + low_crc = btrfs_crc32c(low_crc, &lenum, sizeof(lenum)); return ((u64)high_crc << 31) ^ (u64)low_crc; } diff --git a/fs/btrfs/hash.c b/fs/btrfs/hash.c new file mode 100644 index 0000000..85889aa --- /dev/null +++ b/fs/btrfs/hash.c @@ -0,0 +1,50 @@ +/* + * Copyright (C) 2014 Filipe David Borba Manana <fdmanana@gmail.com> + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License v2 as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + */ + +#include <crypto/hash.h> +#include <linux/err.h> +#include "hash.h" + +static struct crypto_shash *tfm; + +int __init btrfs_hash_init(void) +{ + tfm = crypto_alloc_shash("crc32c", 0, 0); + if (IS_ERR(tfm)) + return PTR_ERR(tfm); + + return 0; +} + +void btrfs_hash_exit(void) +{ + crypto_free_shash(tfm); +} + +u32 btrfs_crc32c(u32 crc, const void *address, unsigned int length) +{ + struct { + struct shash_desc shash; + char ctx[crypto_shash_descsize(tfm)]; + } desc; + int err; + + desc.shash.tfm = tfm; + desc.shash.flags = 0; + *(u32 *)desc.ctx = crc; + + err = crypto_shash_update(&desc.shash, address, length); + BUG_ON(err); + + return *(u32 *)desc.ctx; +} diff --git a/fs/btrfs/hash.h b/fs/btrfs/hash.h index 1d98281..118a231 100644 --- a/fs/btrfs/hash.h +++ b/fs/btrfs/hash.h @@ -19,10 +19,15 @@ #ifndef __HASH__ #define __HASH__ -#include <linux/crc32c.h> +int __init btrfs_hash_init(void); + +void btrfs_hash_exit(void); + +u32 btrfs_crc32c(u32 crc, const void *address, unsigned int length); + static inline u64 btrfs_name_hash(const char *name, int len) { - return crc32c((u32)~1, name, len); + return btrfs_crc32c((u32)~1, name, len); } /* @@ -31,7 +36,7 @@ static inline u64 btrfs_name_hash(const char *name, int len) static inline u64 btrfs_extref_hash(u64 parent_objectid, const char *name, int len) { - return (u64) crc32c(parent_objectid, name, len); + return (u64) btrfs_crc32c(parent_objectid, name, len); } #endif diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c index 461e41c..f44cc6a 100644 --- a/fs/btrfs/super.c +++ b/fs/btrfs/super.c @@ -48,6 +48,7 @@ #include "transaction.h" #include "btrfs_inode.h" #include "print-tree.h" +#include "hash.h" #include "props.h" #include "xattr.h" #include "volumes.h" @@ -1866,11 +1867,15 @@ static int __init init_btrfs_fs(void) { int err; + err = btrfs_hash_init(); + if (err) + return err; + btrfs_props_init(); err = btrfs_init_sysfs(); if (err) - return err; + goto free_hash; btrfs_init_compress(); @@ -1945,6 +1950,8 @@ free_cachep: free_compress: btrfs_exit_compress(); btrfs_exit_sysfs(); +free_hash: + btrfs_hash_exit(); return err; } @@ -1963,6 +1970,7 @@ static void __exit exit_btrfs_fs(void) btrfs_exit_sysfs(); btrfs_cleanup_fs_uuids(); btrfs_exit_compress(); + btrfs_hash_exit(); } module_init(init_btrfs_fs) |