From 82de647e1f81fd89afc48608d889dd3b33cb8983 Mon Sep 17 00:00:00 2001 From: Phillip Lougher Date: Fri, 20 May 2011 02:26:43 +0100 Subject: Squashfs: move table allocation into squashfs_read_table() This eliminates a lot of duplicate code. Signed-off-by: Phillip Lougher --- fs/squashfs/export.c | 19 +------------------ 1 file changed, 1 insertion(+), 18 deletions(-) (limited to 'fs/squashfs/export.c') diff --git a/fs/squashfs/export.c b/fs/squashfs/export.c index 7f93d5a9ee05..cc6dd90cee6a 100644 --- a/fs/squashfs/export.c +++ b/fs/squashfs/export.c @@ -124,27 +124,10 @@ __le64 *squashfs_read_inode_lookup_table(struct super_block *sb, u64 lookup_table_start, unsigned int inodes) { unsigned int length = SQUASHFS_LOOKUP_BLOCK_BYTES(inodes); - __le64 *inode_lookup_table; - int err; TRACE("In read_inode_lookup_table, length %d\n", length); - /* Allocate inode lookup table indexes */ - inode_lookup_table = kmalloc(length, GFP_KERNEL); - if (inode_lookup_table == NULL) { - ERROR("Failed to allocate inode lookup table\n"); - return ERR_PTR(-ENOMEM); - } - - err = squashfs_read_table(sb, inode_lookup_table, lookup_table_start, - length); - if (err < 0) { - ERROR("unable to read inode lookup table\n"); - kfree(inode_lookup_table); - return ERR_PTR(err); - } - - return inode_lookup_table; + return squashfs_read_table(sb, lookup_table_start, length); } -- cgit v1.2.3 From ac51a0a7139aa93bf1176b701c86fa3d2bdf6106 Mon Sep 17 00:00:00 2001 From: Phillip Lougher Date: Tue, 24 May 2011 04:15:21 +0100 Subject: Squashfs: add sanity checks to lookup table reading at mount time Fsfuzzer generates corrupted filesystems which throw a warn_on in kmalloc. One of these is due to a corrupted superblock inodes field. Fix this by checking that the number of bytes to be read (and allocated) does not extend into the next filesystem structure. Also add a couple of other sanity checks of the mount-time lookup table structures. Signed-off-by: Phillip Lougher --- fs/squashfs/export.c | 29 +++++++++++++++++++++++++++-- fs/squashfs/squashfs.h | 2 +- fs/squashfs/super.c | 3 ++- 3 files changed, 30 insertions(+), 4 deletions(-) (limited to 'fs/squashfs/export.c') diff --git a/fs/squashfs/export.c b/fs/squashfs/export.c index cc6dd90cee6a..e3108711a40a 100644 --- a/fs/squashfs/export.c +++ b/fs/squashfs/export.c @@ -121,13 +121,38 @@ static struct dentry *squashfs_get_parent(struct dentry *child) * Read uncompressed inode lookup table indexes off disk into memory */ __le64 *squashfs_read_inode_lookup_table(struct super_block *sb, - u64 lookup_table_start, unsigned int inodes) + u64 lookup_table_start, u64 next_table, unsigned int inodes) { unsigned int length = SQUASHFS_LOOKUP_BLOCK_BYTES(inodes); + __le64 *table; TRACE("In read_inode_lookup_table, length %d\n", length); - return squashfs_read_table(sb, lookup_table_start, length); + /* Sanity check values */ + + /* there should always be at least one inode */ + if (inodes == 0) + return ERR_PTR(-EINVAL); + + /* length bytes should not extend into the next table - this check + * also traps instances where lookup_table_start is incorrectly larger + * than the next table start + */ + if (lookup_table_start + length > next_table) + return ERR_PTR(-EINVAL); + + table = squashfs_read_table(sb, lookup_table_start, length); + + /* + * table[0] points to the first inode lookup table metadata block, + * this should be less than lookup_table_start + */ + if (!IS_ERR(table) && table[0] >= lookup_table_start) { + kfree(table); + return ERR_PTR(-EINVAL); + } + + return table; } diff --git a/fs/squashfs/squashfs.h b/fs/squashfs/squashfs.h index 0e3d220defd2..3b705f137ebb 100644 --- a/fs/squashfs/squashfs.h +++ b/fs/squashfs/squashfs.h @@ -51,7 +51,7 @@ extern const struct squashfs_decompressor *squashfs_lookup_decompressor(int); extern void *squashfs_decompressor_init(struct super_block *, unsigned short); /* export.c */ -extern __le64 *squashfs_read_inode_lookup_table(struct super_block *, u64, +extern __le64 *squashfs_read_inode_lookup_table(struct super_block *, u64, u64, unsigned int); /* fragment.c */ diff --git a/fs/squashfs/super.c b/fs/squashfs/super.c index 8f5f2781a60e..80a7119870a6 100644 --- a/fs/squashfs/super.c +++ b/fs/squashfs/super.c @@ -245,6 +245,7 @@ allocate_id_index_table: msblk->id_table = NULL; goto failed_mount; } + next_table = msblk->id_table[0]; /* Handle inode lookup table */ lookup_table_start = le64_to_cpu(sblk->lookup_table_start); @@ -253,7 +254,7 @@ allocate_id_index_table: /* Allocate and read inode lookup table */ msblk->inode_lookup_table = squashfs_read_inode_lookup_table(sb, - lookup_table_start, msblk->inodes); + lookup_table_start, next_table, msblk->inodes); if (IS_ERR(msblk->inode_lookup_table)) { ERROR("unable to read inode lookup table\n"); err = PTR_ERR(msblk->inode_lookup_table); -- cgit v1.2.3 From d7f2ff6718efa155fd92e481a5960496d084c63f Mon Sep 17 00:00:00 2001 From: Phillip Lougher Date: Thu, 26 May 2011 10:39:56 +0100 Subject: Squashfs: update email address My existing email address may stop working in a month or two, so update email to one that will continue working. Signed-off-by: Phillip Lougher --- MAINTAINERS | 2 +- fs/squashfs/block.c | 2 +- fs/squashfs/cache.c | 2 +- fs/squashfs/decompressor.c | 2 +- fs/squashfs/decompressor.h | 2 +- fs/squashfs/dir.c | 2 +- fs/squashfs/export.c | 2 +- fs/squashfs/file.c | 2 +- fs/squashfs/fragment.c | 2 +- fs/squashfs/id.c | 2 +- fs/squashfs/inode.c | 2 +- fs/squashfs/namei.c | 2 +- fs/squashfs/squashfs.h | 2 +- fs/squashfs/squashfs_fs.h | 2 +- fs/squashfs/squashfs_fs_i.h | 2 +- fs/squashfs/squashfs_fs_sb.h | 2 +- fs/squashfs/super.c | 4 ++-- fs/squashfs/symlink.c | 2 +- fs/squashfs/xattr.c | 2 +- fs/squashfs/xattr.h | 2 +- fs/squashfs/xattr_id.c | 2 +- fs/squashfs/xz_wrapper.c | 2 +- fs/squashfs/zlib_wrapper.c | 2 +- 23 files changed, 24 insertions(+), 24 deletions(-) (limited to 'fs/squashfs/export.c') diff --git a/MAINTAINERS b/MAINTAINERS index 531c5cf150ba..b28f6a7ca9d7 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -5906,7 +5906,7 @@ F: Documentation/filesystems/spufs.txt F: arch/powerpc/platforms/cell/spufs/ SQUASHFS FILE SYSTEM -M: Phillip Lougher +M: Phillip Lougher L: squashfs-devel@lists.sourceforge.net (subscribers-only) W: http://squashfs.org.uk S: Maintained diff --git a/fs/squashfs/block.c b/fs/squashfs/block.c index 8ab48bc2fa7d..ed0eb2a921f4 100644 --- a/fs/squashfs/block.c +++ b/fs/squashfs/block.c @@ -2,7 +2,7 @@ * Squashfs - a compressed read only filesystem for Linux * * Copyright (c) 2002, 2003, 2004, 2005, 2006, 2007, 2008 - * Phillip Lougher + * Phillip Lougher * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License diff --git a/fs/squashfs/cache.c b/fs/squashfs/cache.c index 20c8df1b7efc..7567f7374195 100644 --- a/fs/squashfs/cache.c +++ b/fs/squashfs/cache.c @@ -2,7 +2,7 @@ * Squashfs - a compressed read only filesystem for Linux * * Copyright (c) 2002, 2003, 2004, 2005, 2006, 2007, 2008 - * Phillip Lougher + * Phillip Lougher * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License diff --git a/fs/squashfs/decompressor.c b/fs/squashfs/decompressor.c index e921bd213738..9f1b0bb96f13 100644 --- a/fs/squashfs/decompressor.c +++ b/fs/squashfs/decompressor.c @@ -2,7 +2,7 @@ * Squashfs - a compressed read only filesystem for Linux * * Copyright (c) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 - * Phillip Lougher + * Phillip Lougher * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License diff --git a/fs/squashfs/decompressor.h b/fs/squashfs/decompressor.h index 099745ad5691..8ba70cff09a6 100644 --- a/fs/squashfs/decompressor.h +++ b/fs/squashfs/decompressor.h @@ -4,7 +4,7 @@ * Squashfs - a compressed read only filesystem for Linux * * Copyright (c) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 - * Phillip Lougher + * Phillip Lougher * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License diff --git a/fs/squashfs/dir.c b/fs/squashfs/dir.c index 3f79cd1d0c19..9dfe2ce0fb70 100644 --- a/fs/squashfs/dir.c +++ b/fs/squashfs/dir.c @@ -2,7 +2,7 @@ * Squashfs - a compressed read only filesystem for Linux * * Copyright (c) 2002, 2003, 2004, 2005, 2006, 2007, 2008 - * Phillip Lougher + * Phillip Lougher * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License diff --git a/fs/squashfs/export.c b/fs/squashfs/export.c index e3108711a40a..730c56248c9b 100644 --- a/fs/squashfs/export.c +++ b/fs/squashfs/export.c @@ -2,7 +2,7 @@ * Squashfs - a compressed read only filesystem for Linux * * Copyright (c) 2002, 2003, 2004, 2005, 2006, 2007, 2008 - * Phillip Lougher + * Phillip Lougher * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License diff --git a/fs/squashfs/file.c b/fs/squashfs/file.c index a25c5060bdcb..38bb1c640559 100644 --- a/fs/squashfs/file.c +++ b/fs/squashfs/file.c @@ -2,7 +2,7 @@ * Squashfs - a compressed read only filesystem for Linux * * Copyright (c) 2002, 2003, 2004, 2005, 2006, 2007, 2008 - * Phillip Lougher + * Phillip Lougher * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License diff --git a/fs/squashfs/fragment.c b/fs/squashfs/fragment.c index bfd707569ab7..1516a6490bfb 100644 --- a/fs/squashfs/fragment.c +++ b/fs/squashfs/fragment.c @@ -2,7 +2,7 @@ * Squashfs - a compressed read only filesystem for Linux * * Copyright (c) 2002, 2003, 2004, 2005, 2006, 2007, 2008 - * Phillip Lougher + * Phillip Lougher * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License diff --git a/fs/squashfs/id.c b/fs/squashfs/id.c index 499d08a1f34a..a70858e0fb44 100644 --- a/fs/squashfs/id.c +++ b/fs/squashfs/id.c @@ -2,7 +2,7 @@ * Squashfs - a compressed read only filesystem for Linux * * Copyright (c) 2002, 2003, 2004, 2005, 2006, 2007, 2008 - * Phillip Lougher + * Phillip Lougher * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License diff --git a/fs/squashfs/inode.c b/fs/squashfs/inode.c index 62e63ad25075..04bebcaa2373 100644 --- a/fs/squashfs/inode.c +++ b/fs/squashfs/inode.c @@ -2,7 +2,7 @@ * Squashfs - a compressed read only filesystem for Linux * * Copyright (c) 2002, 2003, 2004, 2005, 2006, 2007, 2008 - * Phillip Lougher + * Phillip Lougher * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License diff --git a/fs/squashfs/namei.c b/fs/squashfs/namei.c index 5d922a6701ab..4bc63ac64bc0 100644 --- a/fs/squashfs/namei.c +++ b/fs/squashfs/namei.c @@ -2,7 +2,7 @@ * Squashfs - a compressed read only filesystem for Linux * * Copyright (c) 2002, 2003, 2004, 2005, 2006, 2007, 2008 - * Phillip Lougher + * Phillip Lougher * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License diff --git a/fs/squashfs/squashfs.h b/fs/squashfs/squashfs.h index 647b81b477d4..e3be6a71cfa7 100644 --- a/fs/squashfs/squashfs.h +++ b/fs/squashfs/squashfs.h @@ -2,7 +2,7 @@ * Squashfs - a compressed read only filesystem for Linux * * Copyright (c) 2002, 2003, 2004, 2005, 2006, 2007, 2008 - * Phillip Lougher + * Phillip Lougher * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License diff --git a/fs/squashfs/squashfs_fs.h b/fs/squashfs/squashfs_fs.h index 4582c568ef4d..b4a4e539a08c 100644 --- a/fs/squashfs/squashfs_fs.h +++ b/fs/squashfs/squashfs_fs.h @@ -4,7 +4,7 @@ * Squashfs * * Copyright (c) 2002, 2003, 2004, 2005, 2006, 2007, 2008 - * Phillip Lougher + * Phillip Lougher * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License diff --git a/fs/squashfs/squashfs_fs_i.h b/fs/squashfs/squashfs_fs_i.h index 359baefc01fc..73588e7700ed 100644 --- a/fs/squashfs/squashfs_fs_i.h +++ b/fs/squashfs/squashfs_fs_i.h @@ -4,7 +4,7 @@ * Squashfs * * Copyright (c) 2002, 2003, 2004, 2005, 2006, 2007, 2008 - * Phillip Lougher + * Phillip Lougher * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License diff --git a/fs/squashfs/squashfs_fs_sb.h b/fs/squashfs/squashfs_fs_sb.h index d9037a5215f0..651f0b31d296 100644 --- a/fs/squashfs/squashfs_fs_sb.h +++ b/fs/squashfs/squashfs_fs_sb.h @@ -4,7 +4,7 @@ * Squashfs * * Copyright (c) 2002, 2003, 2004, 2005, 2006, 2007, 2008 - * Phillip Lougher + * Phillip Lougher * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License diff --git a/fs/squashfs/super.c b/fs/squashfs/super.c index 984d6c861928..6f26abee3597 100644 --- a/fs/squashfs/super.c +++ b/fs/squashfs/super.c @@ -2,7 +2,7 @@ * Squashfs - a compressed read only filesystem for Linux * * Copyright (c) 2002, 2003, 2004, 2005, 2006, 2007, 2008 - * Phillip Lougher + * Phillip Lougher * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License @@ -493,5 +493,5 @@ static const struct super_operations squashfs_super_ops = { module_init(init_squashfs_fs); module_exit(exit_squashfs_fs); MODULE_DESCRIPTION("squashfs 4.0, a compressed read-only filesystem"); -MODULE_AUTHOR("Phillip Lougher "); +MODULE_AUTHOR("Phillip Lougher "); MODULE_LICENSE("GPL"); diff --git a/fs/squashfs/symlink.c b/fs/squashfs/symlink.c index ec86434921e1..1191817264cc 100644 --- a/fs/squashfs/symlink.c +++ b/fs/squashfs/symlink.c @@ -2,7 +2,7 @@ * Squashfs - a compressed read only filesystem for Linux * * Copyright (c) 2002, 2003, 2004, 2005, 2006, 2007, 2008 - * Phillip Lougher + * Phillip Lougher * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License diff --git a/fs/squashfs/xattr.c b/fs/squashfs/xattr.c index 3876c36699a1..92fcde7b4d61 100644 --- a/fs/squashfs/xattr.c +++ b/fs/squashfs/xattr.c @@ -2,7 +2,7 @@ * Squashfs - a compressed read only filesystem for Linux * * Copyright (c) 2010 - * Phillip Lougher + * Phillip Lougher * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License diff --git a/fs/squashfs/xattr.h b/fs/squashfs/xattr.h index 9b3dd6c4c1fe..c83f5d9ec125 100644 --- a/fs/squashfs/xattr.h +++ b/fs/squashfs/xattr.h @@ -2,7 +2,7 @@ * Squashfs - a compressed read only filesystem for Linux * * Copyright (c) 2010 - * Phillip Lougher + * Phillip Lougher * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License diff --git a/fs/squashfs/xattr_id.c b/fs/squashfs/xattr_id.c index f60fb3cce183..c89607d690c4 100644 --- a/fs/squashfs/xattr_id.c +++ b/fs/squashfs/xattr_id.c @@ -2,7 +2,7 @@ * Squashfs - a compressed read only filesystem for Linux * * Copyright (c) 2010 - * Phillip Lougher + * Phillip Lougher * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License diff --git a/fs/squashfs/xz_wrapper.c b/fs/squashfs/xz_wrapper.c index aa47a286d1f8..1760b7d108f6 100644 --- a/fs/squashfs/xz_wrapper.c +++ b/fs/squashfs/xz_wrapper.c @@ -2,7 +2,7 @@ * Squashfs - a compressed read only filesystem for Linux * * Copyright (c) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010 - * Phillip Lougher + * Phillip Lougher * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License diff --git a/fs/squashfs/zlib_wrapper.c b/fs/squashfs/zlib_wrapper.c index 517688b32ffa..55d918fd2d86 100644 --- a/fs/squashfs/zlib_wrapper.c +++ b/fs/squashfs/zlib_wrapper.c @@ -2,7 +2,7 @@ * Squashfs - a compressed read only filesystem for Linux * * Copyright (c) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 - * Phillip Lougher + * Phillip Lougher * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License -- cgit v1.2.3 From d5b72ce15ea99a0b8f0d1973074c584daf92d70e Mon Sep 17 00:00:00 2001 From: Phillip Lougher Date: Sun, 29 May 2011 00:38:46 +0100 Subject: Squashfs: Fix sanity check patches on big-endian systems le64 values should be swapped when accessing on big-endian systems. Signed-off-by: Phillip Lougher --- fs/squashfs/export.c | 2 +- fs/squashfs/fragment.c | 2 +- fs/squashfs/id.c | 2 +- fs/squashfs/super.c | 6 +++--- 4 files changed, 6 insertions(+), 6 deletions(-) (limited to 'fs/squashfs/export.c') diff --git a/fs/squashfs/export.c b/fs/squashfs/export.c index 730c56248c9b..5e1101ff276f 100644 --- a/fs/squashfs/export.c +++ b/fs/squashfs/export.c @@ -147,7 +147,7 @@ __le64 *squashfs_read_inode_lookup_table(struct super_block *sb, * table[0] points to the first inode lookup table metadata block, * this should be less than lookup_table_start */ - if (!IS_ERR(table) && table[0] >= lookup_table_start) { + if (!IS_ERR(table) && le64_to_cpu(table[0]) >= lookup_table_start) { kfree(table); return ERR_PTR(-EINVAL); } diff --git a/fs/squashfs/fragment.c b/fs/squashfs/fragment.c index 1516a6490bfb..0ed6edbc5c71 100644 --- a/fs/squashfs/fragment.c +++ b/fs/squashfs/fragment.c @@ -90,7 +90,7 @@ __le64 *squashfs_read_fragment_index_table(struct super_block *sb, * table[0] points to the first fragment table metadata block, this * should be less than fragment_table_start */ - if (!IS_ERR(table) && table[0] >= fragment_table_start) { + if (!IS_ERR(table) && le64_to_cpu(table[0]) >= fragment_table_start) { kfree(table); return ERR_PTR(-EINVAL); } diff --git a/fs/squashfs/id.c b/fs/squashfs/id.c index a70858e0fb44..d38ea3dab951 100644 --- a/fs/squashfs/id.c +++ b/fs/squashfs/id.c @@ -93,7 +93,7 @@ __le64 *squashfs_read_id_index_table(struct super_block *sb, * table[0] points to the first id lookup table metadata block, this * should be less than id_table_start */ - if (!IS_ERR(table) && table[0] >= id_table_start) { + if (!IS_ERR(table) && le64_to_cpu(table[0]) >= id_table_start) { kfree(table); return ERR_PTR(-EINVAL); } diff --git a/fs/squashfs/super.c b/fs/squashfs/super.c index 6f26abee3597..7438850c62d0 100644 --- a/fs/squashfs/super.c +++ b/fs/squashfs/super.c @@ -245,7 +245,7 @@ allocate_id_index_table: msblk->id_table = NULL; goto failed_mount; } - next_table = msblk->id_table[0]; + next_table = le64_to_cpu(msblk->id_table[0]); /* Handle inode lookup table */ lookup_table_start = le64_to_cpu(sblk->lookup_table_start); @@ -261,7 +261,7 @@ allocate_id_index_table: msblk->inode_lookup_table = NULL; goto failed_mount; } - next_table = msblk->inode_lookup_table[0]; + next_table = le64_to_cpu(msblk->inode_lookup_table[0]); sb->s_export_op = &squashfs_export_ops; @@ -286,7 +286,7 @@ handle_fragments: msblk->fragment_index = NULL; goto failed_mount; } - next_table = msblk->fragment_index[0]; + next_table = le64_to_cpu(msblk->fragment_index[0]); check_directory_table: /* Sanity check directory_table */ -- cgit v1.2.3