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| author | Jan Kara <jack@suse.cz> | 2018-09-06 16:56:10 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-11-21 11:19:12 +0300 |
| commit | 8035d1a13d50a144cb26ee39ca6e225514beb197 (patch) | |
| tree | 5bd8562a270583372e5afa452675dbe560f6f748 /fs/udf/udf_sb.h | |
| parent | 949fd0eaf955a3319080d3bfd699044bacef0abb (diff) | |
| download | linux-8035d1a13d50a144cb26ee39ca6e225514beb197.tar.xz | |
udf: Prevent write-unsupported filesystem to be remounted read-write
[ Upstream commit a9ad01bc759df79b0012f43ee52164391e31cd96 ]
There are certain filesystem features which we support for reading but
not for writing. We properly refuse to mount such filesystems read-write
however for some features (such as read-only partitions), we don't check
for these features when remounting the filesystem from read-only to
read-write. Thus such filesystems could be remounted read-write leading
to strange behavior (most likely crashes).
Fix the problem by marking in superblock whether the filesystem has some
features that are supported in read-only mode and check this flag during
remount.
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs/udf/udf_sb.h')
| -rw-r--r-- | fs/udf/udf_sb.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/fs/udf/udf_sb.h b/fs/udf/udf_sb.h index 9424d7cab790..d12e507e9eb2 100644 --- a/fs/udf/udf_sb.h +++ b/fs/udf/udf_sb.h @@ -30,6 +30,8 @@ #define UDF_FLAG_LASTBLOCK_SET 16 #define UDF_FLAG_BLOCKSIZE_SET 17 #define UDF_FLAG_INCONSISTENT 18 +#define UDF_FLAG_RW_INCOMPAT 19 /* Set when we find RW incompatible + * feature */ #define UDF_PART_FLAG_UNALLOC_BITMAP 0x0001 #define UDF_PART_FLAG_UNALLOC_TABLE 0x0002 |