From cb0f39c9cd698f089de8f0cacfbc5cc69655e430 Mon Sep 17 00:00:00 2001 From: Christian Lamparter Date: Sat, 29 Dec 2018 13:41:35 +0100 Subject: [PATCH] kernel: fix f2fs on big endian machines The WD MyBook Live SquashFS images didn't work anymore due to a upstream regression in f2fs commit: 0cfe75c5b01199 ("f2fs: enhance sanity_check_raw_super() to avoid potential overflows") that got backported to 4.14.86 and landed in 4.18. by Martin Blumenstingl: |Treat "block_count" from struct f2fs_super_block as 64-bit little endian |value in sanity_check_raw_super() because struct f2fs_super_block |declares "block_count" as "__le64". | |This fixes a bug where the superblock validation fails on big endian |devices with the following error: | F2FS-fs (sda1): Wrong segment_count / block_count (61439 > 0) | F2FS-fs (sda1): Can't find valid F2FS filesystem in 1th superblock | F2FS-fs (sda1): Wrong segment_count / block_count (61439 > 0) | F2FS-fs (sda1): Can't find valid F2FS filesystem in 2th superblock |As result of this the partition cannot be mounted. | |With this patch applied the superblock validation works fine and the |partition can be mounted again: | F2FS-fs (sda1): Mounted with checkpoint version = 7c84 | |My little endian x86-64 hardware was able to mount the partition without |this fix. |To confirm that mounting f2fs filesystems works on big endian machines |again I tested this on a 32-bit MIPS big endian (lantiq) device. Hopefully, this will do until Martin's patch moved through upstream to -stable. Signed-off-by: Christian Lamparter --- ...eck_raw_super-on-big-endian-machines.patch | 51 +++++++++++++++++++ ...eck_raw_super-on-big-endian-machines.patch | 49 ++++++++++++++++++ 2 files changed, 100 insertions(+) create mode 100644 target/linux/generic/pending-4.14/510-f2fs-fix-sanity_check_raw_super-on-big-endian-machines.patch create mode 100644 target/linux/generic/pending-4.19/510-f2fs-fix-sanity_check_raw_super-on-big-endian-machines.patch diff --git a/target/linux/generic/pending-4.14/510-f2fs-fix-sanity_check_raw_super-on-big-endian-machines.patch b/target/linux/generic/pending-4.14/510-f2fs-fix-sanity_check_raw_super-on-big-endian-machines.patch new file mode 100644 index 0000000000..6cbaf28e81 --- /dev/null +++ b/target/linux/generic/pending-4.14/510-f2fs-fix-sanity_check_raw_super-on-big-endian-machines.patch @@ -0,0 +1,51 @@ +From: Martin Blumenstingl +To: linux-f2fs-devel@lists.sourceforge.net, yuchao0@huawei.com, + jaegeuk@kernel.org +Subject: [PATCH v2 1/1] f2fs: fix validation of the block count in + sanity_check_raw_super +Date: Sat, 22 Dec 2018 11:22:26 +0100 +Message-Id: <20181222102226.10050-2-martin.blumenstingl@googlemail.com> + +Treat "block_count" from struct f2fs_super_block as 64-bit little endian +value in sanity_check_raw_super() because struct f2fs_super_block +declares "block_count" as "__le64". + +This fixes a bug where the superblock validation fails on big endian +devices with the following error: + F2FS-fs (sda1): Wrong segment_count / block_count (61439 > 0) + F2FS-fs (sda1): Can't find valid F2FS filesystem in 1th superblock + F2FS-fs (sda1): Wrong segment_count / block_count (61439 > 0) + F2FS-fs (sda1): Can't find valid F2FS filesystem in 2th superblock +As result of this the partition cannot be mounted. + +With this patch applied the superblock validation works fine and the +partition can be mounted again: + F2FS-fs (sda1): Mounted with checkpoint version = 7c84 + +My little endian x86-64 hardware was able to mount the partition without +this fix. +To confirm that mounting f2fs filesystems works on big endian machines +again I tested this on a 32-bit MIPS big endian (lantiq) device. + +Fixes: 0cfe75c5b01199 ("f2fs: enhance sanity_check_raw_super() to avoid potential overflows") +Cc: stable@vger.kernel.org +Signed-off-by: Martin Blumenstingl +Reviewed-by: Chao Yu +--- + +--- a/fs/f2fs/super.c ++++ b/fs/f2fs/super.c +@@ -1897,10 +1897,10 @@ static int sanity_check_raw_super(struct + return 1; + } + +- if (segment_count > (le32_to_cpu(raw_super->block_count) >> 9)) { ++ if (segment_count > (le64_to_cpu(raw_super->block_count) >> 9)) { + f2fs_msg(sb, KERN_INFO, +- "Wrong segment_count / block_count (%u > %u)", +- segment_count, le32_to_cpu(raw_super->block_count)); ++ "Wrong segment_count / block_count (%u > %llu)", ++ segment_count, le64_to_cpu(raw_super->block_count)); + return 1; + } + diff --git a/target/linux/generic/pending-4.19/510-f2fs-fix-sanity_check_raw_super-on-big-endian-machines.patch b/target/linux/generic/pending-4.19/510-f2fs-fix-sanity_check_raw_super-on-big-endian-machines.patch new file mode 100644 index 0000000000..5a272b40ba --- /dev/null +++ b/target/linux/generic/pending-4.19/510-f2fs-fix-sanity_check_raw_super-on-big-endian-machines.patch @@ -0,0 +1,49 @@ +From: Martin Blumenstingl +Subject: [PATCH v2 1/1] f2fs: fix validation of the block count in + sanity_check_raw_super +Date: Sat, 22 Dec 2018 11:22:26 +0100 +Message-Id: <20181222102226.10050-2-martin.blumenstingl@googlemail.com> + +Treat "block_count" from struct f2fs_super_block as 64-bit little endian +value in sanity_check_raw_super() because struct f2fs_super_block +declares "block_count" as "__le64". + +This fixes a bug where the superblock validation fails on big endian +devices with the following error: + F2FS-fs (sda1): Wrong segment_count / block_count (61439 > 0) + F2FS-fs (sda1): Can't find valid F2FS filesystem in 1th superblock + F2FS-fs (sda1): Wrong segment_count / block_count (61439 > 0) + F2FS-fs (sda1): Can't find valid F2FS filesystem in 2th superblock +As result of this the partition cannot be mounted. + +With this patch applied the superblock validation works fine and the +partition can be mounted again: + F2FS-fs (sda1): Mounted with checkpoint version = 7c84 + +My little endian x86-64 hardware was able to mount the partition without +this fix. +To confirm that mounting f2fs filesystems works on big endian machines +again I tested this on a 32-bit MIPS big endian (lantiq) device. + +Fixes: 0cfe75c5b01199 ("f2fs: enhance sanity_check_raw_super() to avoid potential overflows") +Cc: stable@vger.kernel.org +Signed-off-by: Martin Blumenstingl +Reviewed-by: Chao Yu +--- + +--- a/fs/f2fs/super.c ++++ b/fs/f2fs/super.c +@@ -2267,10 +2267,10 @@ static int sanity_check_raw_super(struct + return 1; + } + +- if (segment_count > (le32_to_cpu(raw_super->block_count) >> 9)) { ++ if (segment_count > (le64_to_cpu(raw_super->block_count) >> 9)) { + f2fs_msg(sb, KERN_INFO, +- "Wrong segment_count / block_count (%u > %u)", +- segment_count, le32_to_cpu(raw_super->block_count)); ++ "Wrong segment_count / block_count (%u > %llu)", ++ segment_count, le64_to_cpu(raw_super->block_count)); + return 1; + } + -- 2.30.2