From 7f78e0351394052e1a6293e175825eb5c7869507 Mon Sep 17 00:00:00 2001 From: "Eric W. Biederman" Date: Sat, 2 Mar 2013 19:39:14 -0800 Subject: fs: Limit sys_mount to only request filesystem modules. Modify the request_module to prefix the file system type with "fs-" and add aliases to all of the filesystems that can be built as modules to match. A common practice is to build all of the kernel code and leave code that is not commonly needed as modules, with the result that many users are exposed to any bug anywhere in the kernel. Looking for filesystems with a fs- prefix limits the pool of possible modules that can be loaded by mount to just filesystems trivially making things safer with no real cost. Using aliases means user space can control the policy of which filesystem modules are auto-loaded by editing /etc/modprobe.d/*.conf with blacklist and alias directives. Allowing simple, safe, well understood work-arounds to known problematic software. This also addresses a rare but unfortunate problem where the filesystem name is not the same as it's module name and module auto-loading would not work. While writing this patch I saw a handful of such cases. The most significant being autofs that lives in the module autofs4. This is relevant to user namespaces because we can reach the request module in get_fs_type() without having any special permissions, and people get uncomfortable when a user specified string (in this case the filesystem type) goes all of the way to request_module. After having looked at this issue I don't think there is any particular reason to perform any filtering or permission checks beyond making it clear in the module request that we want a filesystem module. The common pattern in the kernel is to call request_module() without regards to the users permissions. In general all a filesystem module does once loaded is call register_filesystem() and go to sleep. Which means there is not much attack surface exposed by loading a filesytem module unless the filesystem is mounted. In a user namespace filesystems are not mounted unless .fs_flags = FS_USERNS_MOUNT, which most filesystems do not set today. Acked-by: Serge Hallyn Acked-by: Kees Cook Reported-by: Kees Cook Signed-off-by: "Eric W. Biederman" --- fs/ext4/super.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) (limited to 'fs/ext4/super.c') diff --git a/fs/ext4/super.c b/fs/ext4/super.c index 5e6c87836193..34e855219231 100644 --- a/fs/ext4/super.c +++ b/fs/ext4/super.c @@ -90,6 +90,7 @@ static struct file_system_type ext2_fs_type = { .kill_sb = kill_block_super, .fs_flags = FS_REQUIRES_DEV, }; +MODULE_ALIAS_FS("ext2"); #define IS_EXT2_SB(sb) ((sb)->s_bdev->bd_holder == &ext2_fs_type) #else #define IS_EXT2_SB(sb) (0) @@ -104,6 +105,7 @@ static struct file_system_type ext3_fs_type = { .kill_sb = kill_block_super, .fs_flags = FS_REQUIRES_DEV, }; +MODULE_ALIAS_FS("ext3"); #define IS_EXT3_SB(sb) ((sb)->s_bdev->bd_holder == &ext3_fs_type) #else #define IS_EXT3_SB(sb) (0) @@ -5152,7 +5154,6 @@ static inline int ext2_feature_set_ok(struct super_block *sb) return 0; return 1; } -MODULE_ALIAS("ext2"); #else static inline void register_as_ext2(void) { } static inline void unregister_as_ext2(void) { } @@ -5185,7 +5186,6 @@ static inline int ext3_feature_set_ok(struct super_block *sb) return 0; return 1; } -MODULE_ALIAS("ext3"); #else static inline void register_as_ext3(void) { } static inline void unregister_as_ext3(void) { } @@ -5199,6 +5199,7 @@ static struct file_system_type ext4_fs_type = { .kill_sb = kill_block_super, .fs_flags = FS_REQUIRES_DEV, }; +MODULE_ALIAS_FS("ext4"); static int __init ext4_init_feat_adverts(void) { -- cgit v1.2.3 From 90ba983f6889e65a3b506b30dc606aa9d1d46cd2 Mon Sep 17 00:00:00 2001 From: Theodore Ts'o Date: Mon, 11 Mar 2013 23:39:59 -0400 Subject: ext4: use atomic64_t for the per-flexbg free_clusters count A user who was using a 8TB+ file system and with a very large flexbg size (> 65536) could cause the atomic_t used in the struct flex_groups to overflow. This was detected by PaX security patchset: http://forums.grsecurity.net/viewtopic.php?f=3&t=3289&p=12551#p12551 This bug was introduced in commit 9f24e4208f7e, so it's been around since 2.6.30. :-( Fix this by using an atomic64_t for struct orlav_stats's free_clusters. Signed-off-by: "Theodore Ts'o" Reviewed-by: Lukas Czerner Cc: stable@vger.kernel.org --- fs/ext4/ext4.h | 6 +++--- fs/ext4/ialloc.c | 4 ++-- fs/ext4/mballoc.c | 12 ++++++------ fs/ext4/resize.c | 4 ++-- fs/ext4/super.c | 4 ++-- 5 files changed, 15 insertions(+), 15 deletions(-) (limited to 'fs/ext4/super.c') diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h index 4a01ba315262..167ff564bbfa 100644 --- a/fs/ext4/ext4.h +++ b/fs/ext4/ext4.h @@ -335,9 +335,9 @@ struct ext4_group_desc */ struct flex_groups { - atomic_t free_inodes; - atomic_t free_clusters; - atomic_t used_dirs; + atomic64_t free_clusters; + atomic_t free_inodes; + atomic_t used_dirs; }; #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */ diff --git a/fs/ext4/ialloc.c b/fs/ext4/ialloc.c index 32fd2b9075dd..6c5bb8d993fe 100644 --- a/fs/ext4/ialloc.c +++ b/fs/ext4/ialloc.c @@ -324,8 +324,8 @@ error_return: } struct orlov_stats { + __u64 free_clusters; __u32 free_inodes; - __u32 free_clusters; __u32 used_dirs; }; @@ -342,7 +342,7 @@ static void get_orlov_stats(struct super_block *sb, ext4_group_t g, if (flex_size > 1) { stats->free_inodes = atomic_read(&flex_group[g].free_inodes); - stats->free_clusters = atomic_read(&flex_group[g].free_clusters); + stats->free_clusters = atomic64_read(&flex_group[g].free_clusters); stats->used_dirs = atomic_read(&flex_group[g].used_dirs); return; } diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c index 8b2ea9f75004..ee6614bdb639 100644 --- a/fs/ext4/mballoc.c +++ b/fs/ext4/mballoc.c @@ -2804,8 +2804,8 @@ ext4_mb_mark_diskspace_used(struct ext4_allocation_context *ac, if (sbi->s_log_groups_per_flex) { ext4_group_t flex_group = ext4_flex_group(sbi, ac->ac_b_ex.fe_group); - atomic_sub(ac->ac_b_ex.fe_len, - &sbi->s_flex_groups[flex_group].free_clusters); + atomic64_sub(ac->ac_b_ex.fe_len, + &sbi->s_flex_groups[flex_group].free_clusters); } err = ext4_handle_dirty_metadata(handle, NULL, bitmap_bh); @@ -4661,8 +4661,8 @@ do_more: if (sbi->s_log_groups_per_flex) { ext4_group_t flex_group = ext4_flex_group(sbi, block_group); - atomic_add(count_clusters, - &sbi->s_flex_groups[flex_group].free_clusters); + atomic64_add(count_clusters, + &sbi->s_flex_groups[flex_group].free_clusters); } ext4_mb_unload_buddy(&e4b); @@ -4804,8 +4804,8 @@ int ext4_group_add_blocks(handle_t *handle, struct super_block *sb, if (sbi->s_log_groups_per_flex) { ext4_group_t flex_group = ext4_flex_group(sbi, block_group); - atomic_add(EXT4_NUM_B2C(sbi, blocks_freed), - &sbi->s_flex_groups[flex_group].free_clusters); + atomic64_add(EXT4_NUM_B2C(sbi, blocks_freed), + &sbi->s_flex_groups[flex_group].free_clusters); } ext4_mb_unload_buddy(&e4b); diff --git a/fs/ext4/resize.c b/fs/ext4/resize.c index b2c8ee56eb98..c169477a62c9 100644 --- a/fs/ext4/resize.c +++ b/fs/ext4/resize.c @@ -1360,8 +1360,8 @@ static void ext4_update_super(struct super_block *sb, sbi->s_log_groups_per_flex) { ext4_group_t flex_group; flex_group = ext4_flex_group(sbi, group_data[0].group); - atomic_add(EXT4_NUM_B2C(sbi, free_blocks), - &sbi->s_flex_groups[flex_group].free_clusters); + atomic64_add(EXT4_NUM_B2C(sbi, free_blocks), + &sbi->s_flex_groups[flex_group].free_clusters); atomic_add(EXT4_INODES_PER_GROUP(sb) * flex_gd->count, &sbi->s_flex_groups[flex_group].free_inodes); } diff --git a/fs/ext4/super.c b/fs/ext4/super.c index 9379b7fbfd92..d1ee6a84338a 100644 --- a/fs/ext4/super.c +++ b/fs/ext4/super.c @@ -1923,8 +1923,8 @@ static int ext4_fill_flex_info(struct super_block *sb) flex_group = ext4_flex_group(sbi, i); atomic_add(ext4_free_inodes_count(sb, gdp), &sbi->s_flex_groups[flex_group].free_inodes); - atomic_add(ext4_free_group_clusters(sb, gdp), - &sbi->s_flex_groups[flex_group].free_clusters); + atomic64_add(ext4_free_group_clusters(sb, gdp), + &sbi->s_flex_groups[flex_group].free_clusters); atomic_add(ext4_used_dirs_count(sb, gdp), &sbi->s_flex_groups[flex_group].used_dirs); } -- cgit v1.2.3 From fa7614ddd6c2368b8cd54cc67ab4b767af0a2a50 Mon Sep 17 00:00:00 2001 From: "Eric W. Biederman" Date: Tue, 12 Mar 2013 18:27:41 -0700 Subject: fs: Readd the fs module aliases. I had assumed that the only use of module aliases for filesystems prior to "fs: Limit sys_mount to only request filesystem modules." was in request_module. It turns out I was wrong. At least mkinitcpio in Arch linux uses these aliases. So readd the preexising aliases, to keep from breaking userspace. Userspace eventually will have to follow and use the same aliases the kernel does. So at some point we may be delete these aliases without problems. However that day is not today. Signed-off-by: "Eric W. Biederman" --- fs/ext4/super.c | 2 ++ fs/freevxfs/vxfs_super.c | 1 + fs/isofs/inode.c | 1 + fs/nfs/super.c | 1 + fs/sysv/super.c | 1 + net/sunrpc/rpc_pipe.c | 1 + 6 files changed, 7 insertions(+) (limited to 'fs/ext4/super.c') diff --git a/fs/ext4/super.c b/fs/ext4/super.c index 34e855219231..b3818b48f418 100644 --- a/fs/ext4/super.c +++ b/fs/ext4/super.c @@ -91,6 +91,7 @@ static struct file_system_type ext2_fs_type = { .fs_flags = FS_REQUIRES_DEV, }; MODULE_ALIAS_FS("ext2"); +MODULE_ALIAS("ext2"); #define IS_EXT2_SB(sb) ((sb)->s_bdev->bd_holder == &ext2_fs_type) #else #define IS_EXT2_SB(sb) (0) @@ -106,6 +107,7 @@ static struct file_system_type ext3_fs_type = { .fs_flags = FS_REQUIRES_DEV, }; MODULE_ALIAS_FS("ext3"); +MODULE_ALIAS("ext3"); #define IS_EXT3_SB(sb) ((sb)->s_bdev->bd_holder == &ext3_fs_type) #else #define IS_EXT3_SB(sb) (0) diff --git a/fs/freevxfs/vxfs_super.c b/fs/freevxfs/vxfs_super.c index 455074308069..e37eb274e492 100644 --- a/fs/freevxfs/vxfs_super.c +++ b/fs/freevxfs/vxfs_super.c @@ -258,6 +258,7 @@ static struct file_system_type vxfs_fs_type = { .fs_flags = FS_REQUIRES_DEV, }; MODULE_ALIAS_FS("vxfs"); /* makes mount -t vxfs autoload the module */ +MODULE_ALIAS("vxfs"); static int __init vxfs_init(void) diff --git a/fs/isofs/inode.c b/fs/isofs/inode.c index a67f16e846a2..d9b8aebdeb22 100644 --- a/fs/isofs/inode.c +++ b/fs/isofs/inode.c @@ -1557,6 +1557,7 @@ static struct file_system_type iso9660_fs_type = { .fs_flags = FS_REQUIRES_DEV, }; MODULE_ALIAS_FS("iso9660"); +MODULE_ALIAS("iso9660"); static int __init init_iso9660_fs(void) { diff --git a/fs/nfs/super.c b/fs/nfs/super.c index 95cdcb208dfb..2f8a29db0f1b 100644 --- a/fs/nfs/super.c +++ b/fs/nfs/super.c @@ -335,6 +335,7 @@ struct file_system_type nfs4_fs_type = { .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA, }; MODULE_ALIAS_FS("nfs4"); +MODULE_ALIAS("nfs4"); EXPORT_SYMBOL_GPL(nfs4_fs_type); static int __init register_nfs4_fs(void) diff --git a/fs/sysv/super.c b/fs/sysv/super.c index a39938b1feea..d0c6a007ce83 100644 --- a/fs/sysv/super.c +++ b/fs/sysv/super.c @@ -555,6 +555,7 @@ static struct file_system_type v7_fs_type = { .fs_flags = FS_REQUIRES_DEV, }; MODULE_ALIAS_FS("v7"); +MODULE_ALIAS("v7"); static int __init init_sysv_fs(void) { diff --git a/net/sunrpc/rpc_pipe.c b/net/sunrpc/rpc_pipe.c index a0f48a51e14e..a9129f8d7070 100644 --- a/net/sunrpc/rpc_pipe.c +++ b/net/sunrpc/rpc_pipe.c @@ -1175,6 +1175,7 @@ static struct file_system_type rpc_pipe_fs_type = { .kill_sb = rpc_kill_sb, }; MODULE_ALIAS_FS("rpc_pipefs"); +MODULE_ALIAS("rpc_pipefs"); static void init_once(void *foo) -- cgit v1.2.3