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* Use calloc() to allocate token_list. This avoids an illegal free if
sqfs_tokenize() fails.
* Do not iterate over token_list if it has not been allocated.
Addresses-Coverity-ID: 510453: Null pointer dereferences (FORWARD_NULL)
Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Reviewed-by: Joao Marcos Costa <joaomarcos.costa@bootlin.com>
Reviewed-by: Joao Marcos Costa <jmcosta944@gmail.com>
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It is confusing to have both "$(PHASE_)" and "$(XPL_)" be used in our
Makefiles as part of the macros to determine when to do something in our
Makefiles based on what phase of the build we are in. For consistency,
bring this down to a single macro and use "$(PHASE_)" only.
Signed-off-by: Tom Rini <trini@konsulko.com>
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In case MAX_SYMLINK_NEST is reached while determining the size
on a symlink node, the function returns immediately.
This would not free the resources after the free_strings: label
causing a memory leak.
Set the ret value and just break out of the switch to fix this.
Signed-off-by: Andrea della Porta <andrea.porta@suse.com>
Reviewed-by: Miquel Raynal <miquel.raynal@bootlin.com>
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The length of buffers used to read inode tables, directory tables, and
reading a file are calculated as: number of blocks * block size, and
such plain multiplication is prone to overflowing (thus unsafe).
Replace it by __builtin_mul_overflow, i.e. safe math.
Signed-off-by: Joao Marcos Costa <joaomarcos.costa@bootlin.com>
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A squashfs filesystem with extended attributes (xattrs) may have
inodes of type SQFS_LSYMLINK_TYPE. This might cause u-boot to fail to
handle the filesystem since it assumes a SYMLINK_TYPE and LSYMLINK_TYPE
inode are the same size. This is wrong, see:
https://github.com/plougher/squashfs-tools/blob/master/squashfs-tools/read_fs.c#L421
Using the mksquashfs '-no-xattrs' argument is probably best, but the
mksquashfs '-xattrs' argument is the default.
This patch fixes squashfs image handling by making sure parsing the
uncompressed inode_table (with sqfs_find_inode) succeeeds. The only change
needed is correctly determining the size of a SQFS_LSYMLINK_TYPE inode.
Signed-off-by: Norbert van Bolhuis <nvbolhuis@gmail.com>
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Use XPL_ as the symbol to indicate an SPL build. This means that SPL_ is
no-longer set.
Signed-off-by: Simon Glass <sjg@chromium.org>
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res needs to be large enough to store both strings rem and target,
plus the path separator and the terminator.
Currently the space for the path separator is not accounted, so
the heap is corrupted by one byte.
Signed-off-by: Richard Weinberger <richard@nod.at>
Reviewed-by: Miquel Raynal <miquel.raynal@bootlin.com>
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The squashfs driver blindly follows symlinks, and calls sqfs_size()
recursively. So an attacker can create a crafted filesystem and with
a deep enough nesting level a stack overflow can be achieved.
Fix by limiting the nesting level to 8.
Signed-off-by: Richard Weinberger <richard@nod.at>
Reviewed-by: Miquel Raynal <miquel.raynal@bootlin.com>
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The function can fail and return NULL.
Signed-off-by: Richard Weinberger <richard@nod.at>
Reviewed-by: Miquel Raynal <miquel.raynal@bootlin.com>
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A carefully crafted squashfs filesystem can exhibit an extremly large
inode size and overflow the calculation in sqfs_inode_size().
As a consequence, the squashfs driver will read from wrong locations.
Fix by using __builtin_add_overflow() to detect the overflow.
Signed-off-by: Richard Weinberger <richard@nod.at>
Reviewed-by: Miquel Raynal <miquel.raynal@bootlin.com>
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A carefully crafted squashfs filesystem can exhibit an inode size of 0xffffffff,
as a consequence malloc() will do a zero allocation.
Later in the function the inode size is again used for copying data.
So an attacker can overwrite memory.
Avoid the overflow by using the __builtin_add_overflow() helper.
Signed-off-by: Richard Weinberger <richard@nod.at>
Reviewed-by: Miquel Raynal <miquel.raynal@bootlin.com>
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The structure is identical to the existing compressor implementations,
trivially adding lz4 decompression to sqfs_decompress.
The changes were tested using a sandbox build. An LZ4 compressed
squashfs image was bound as a host block device.
Signed-off-by: David Oberhollenzer <goliath@infraroot.at>
Reviewed-by: Joao Marcos Costa <jmcosta944@gmail.com>
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This patch removes a number of struct and macro declaration that
were found through `git-grep` to be unused. Most of those are
related to compressor options and super block flags.
For reading a SquashFS image, we do not need the compressor options
or the flags. Those only encode settings used for packing the image,
mksquashfs uses them when appending data to an existing image. The
kernel implementation does not touch those, and we don't need them
either.
Signed-off-by: David Oberhollenzer <goliath@infraroot.at>
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Update the zstd implementation to match Linux zstd 1.5.2 from commit
2aa14b1ab2.
This was motivated by running into decompression corruption issues when
trying to uncompress files compressed with newer versions of zstd. zstd
users also claim significantly improved decompression times with newer
zstd versions which is a side benefit.
Original zstd code was copied from Linux commit 2aa14b1ab2 which is a
custom-built implementation based on zstd 1.3.1. Linux switched to an
implementation that is a copy of the upstream zstd code in Linux commit
e0c1b49f5b, this results in a large code diff. However this should make
future updates easier along with other benefits[1].
This commit is a straight mirror of the Linux zstd code, except to:
- update a few #include that do not translate cleanly
- linux/swab.h -> asm/byteorder.h
- linux/limits.h -> linux/kernel.h
- linux/module.h -> linux/compat.h
- remove assert() from debug.h so it doesn't conflict with u-boot's
assert()
- strip out the compressor code as was done in the previous u-boot zstd
- update existing zstd users to the new Linux zstd API
- change the #define for MEM_STATIC to use INLINE_KEYWORD for codesize
- add a new KConfig option that sets zstd build options to minify code
based on zstd's ZSTD_LIB_MINIFY[2].
These changes were tested by booting a zstd 1.5.2 compressed kernel inside a
FIT. And the squashfs changes by loading a file from zstd compressed squashfs
with sqfsload. buildman was used to compile test other boards and check for
binary bloat, as follows:
> $ buildman -b zstd2 --boards dh_imx6,m53menlo,mvebu_espressobin-88f3720,sandbox,sandbox64,stm32mp15_dhcom_basic,stm32mp15_dhcor_basic,turris_mox,turris_omnia -sS
> Summary of 6 commits for 9 boards (8 threads, 1 job per thread)
> 01: Merge branch '2023-01-10-platform-updates'
> arm: w+ m53menlo dh_imx6
> 02: lib: zstd: update to latest Linux zstd 1.5.2
> aarch64: (for 2/2 boards) all -3186.0 rodata +920.0 text -4106.0
> arm: (for 5/5 boards) all +1254.4 rodata +940.0 text +314.4
> sandbox: (for 2/2 boards) all -4452.0 data -16.0 rodata +640.0 text -5076.0
[1] https://github.com/torvalds/linux/commit/e0c1b49f5b674cca7b10549c53b3791d0bbc90a8
[2] https://github.com/facebook/zstd/blob/f302ad8811643c428c4e3498e28f53a0578020d3/lib/libzstd.mk#L31
Signed-off-by: Brandon Maier <brandon.maier@collins.com>
[trini: Set ret to -EINVAL for the error of "failed to detect
compressed" to fix warning, drop ZSTD_SRCSIZEHINT_MAX for non-Linux host
tool builds]
Signed-off-by: Tom Rini <trini@konsulko.com>
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For a squashfs filesystem, the fragment table is followed by
the following tables: NFS export table, ID table, xattr table.
The export and xattr tables are both completely optional, but
the ID table is mandatory. The Linux implementation refuses to
mount the image if the ID table is missing. Tables that are no
present have their location in the super block set
to 0xFFFFFFFFFFFFFFFF.
The u-boot implementation previously assumed that it can always
rely on the export table location as an upper bound for the fragment
table, trying (and failing) to read past filesystem bounds if it
is not present.
This patch changes the driver to use the ID table instead and only
use the export table location if it lies between the two.
Signed-off-by: David Oberhollenzer <goliath@infraroot.at>
Reviewed-by: Miquel Raynal <miquel.raynal@bootlin.com>
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When compling for x86:
u-boot/fs/squashfs/sqfs.c:90: undefined reference to `__udivmoddi4'
Signed-off-by: Kasper Revsbech <kasper.revsbech.ext@siemensgamesa.com>
Tested-by: Sean Nyekjaer <sean@geanix.com>
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A crafted squashfs image could embed a huge number of empty metadata
blocks in order to make the amount of malloc()'d memory overflow and be
much smaller than expected. Because of this flaw, any random code
positioned at the right location in the squashfs image could be memcpy'd
from the squashfs structures into U-Boot code location while trying to
access the rearmost blocks, before being executed.
In order to prevent this vulnerability from being exploited in eg. a
secure boot environment, let's add a check over the amount of data
that is going to be allocated. Such a check could look like:
if (!elem_size || n > SIZE_MAX / elem_size)
return NULL;
The right way to do it would be to enhance the calloc() implementation
but this is quite an impacting change for such a small fix. Another
solution would be to add the check before the malloc call in the
squashfs implementation, but this does not look right. So for now, let's
use the kcalloc() compatibility function from Linux, which has this
check.
Fixes: c5100613037 ("fs/squashfs: new filesystem")
Reported-by: Tatsuhiko Yasumatsu <Tatsuhiko.Yasumatsu@sony.com>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Tested-by: Tatsuhiko Yasumatsu <Tatsuhiko.Yasumatsu@sony.com>
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Merge in v2022.07-rc5.
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Following Jincheng's report, an out-of-band write leading to arbitrary
code execution is possible because on one side the squashfs logic
accepts directory names up to 65535 bytes (u16), while U-Boot fs logic
accepts directory names up to 255 bytes long.
Prevent such an exploit from happening by capping directory name sizes
to 255. Use a define for this purpose so that developers can link the
limitation to its source and eventually kill it some day by dynamically
allocating this array (if ever desired).
Link: https://lore.kernel.org/all/CALO=DHFB+yBoXxVr5KcsK0iFdg+e7ywko4-e+72kjbcS8JBfPw@mail.gmail.com
Reported-by: Jincheng Wang <jc.w4ng@gmail.com>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Tested-by: Jincheng Wang <jc.w4ng@gmail.com>
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Setting sblk = NULL has no effect on the caller.
We want to set *sblk = NULL if an error occurrs to avoid usage after free.
Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
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Signed-off-by: Pali Rohár <pali@kernel.org>
Reviewed-by: Miquel Raynal <miquel.raynal@bootlin.com>
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When compling for x86:
ld.bfd: fs/squashfs/sqfs.o: in function `sqfs_read':
u-boot/fs/squashfs/sqfs.c:1443: undefined reference to `__udivmoddi4'
ld.bfd: u-boot/fs/squashfs/sqfs.c:1521: undefined reference to `__udivmoddi4'
Signed-off-by: Sean Nyekjaer <sean.nyekjaer.ext@siemensgamesa.com>
Reviewed-by: Miquel Raynal <miquel.raynal@bootlin.com>
Reviewed-by: Pali Rohár <pali@kernel.org>
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* Don't check argument of free(). Free does this itself.
* Reduce scope of data_buffer. Remove duplicate free().
* Avoid superfluous NULL assignment.
Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Reviewed-by: Miquel Raynal <miquel.raynal@bootlin.com>
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Signed-off-by: Lars Weber <weber@weber-software.com>
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This message comes up a lot when scanning filesystems. It suggests to the
user that there is some sort of error, but in fact there is no reason to
expect that a particular partition has a sqfs filesystem. Other
filesystems don't print this error.
Turn it into a debug message.
Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Miquel Raynal <miquel.raynal@bootlin.com>
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In SquashFS, the contents of a directory is stored by
squashfs_directory_entry structures which contain the file's name, inode
and position within the filesystem.
The inode number is not stored directly; instead each directory has one
or more headers which set a base inode number, and files store the
offset from that to the file's inode number.
In mksquashfs, each inode is allocated a number in the same order as
they are written to the directory table; thus the offset from the
header's base inode number to the file's inode number is usually
positive.
Hardlinks are simply stored with two directory entries referencing the
same file. This means the second entry will thus have an inode number
much lower than the surrounding files. Since the header's base inode
number comes from the first entry that uses the header, this delta will
usually be negative.
Previously, U-Boot's squashfs_directory_entry.inode_offset field was
declared as an unsigned value. Thus when a negative value was found, it
would either resolve to an invalid inode number or to that of an
unrelated file.
A squashfs image to test this can be created like so:
echo hi > sqfs_test_files/001-root-file
mkdir sqfs_test_files/002-subdir
touch sqfs_test_files/002-subdir/003-file
ln sqfs_test_files/{001-root-file,002-subdir/004-link}
mksquashfs sqfs_test_files/ test.sqfs -noappend
Note that squashfs sorts the files ASCIIbetacally, so we can use the
names to control the order they appear in. The ordering is important -
the first reference to the file must have a lower inode number than the
directory in which the second reference resides, and the second
reference cannot be the first file in the directory.
Listing this sample image in U-Boot results in:
=> sqfsls virtio 2 002-subdir
0 003-file
Inode not found.
0 004-link
Signed-off-by: Campbell Suter <campbell@snapit.group>
Reviewed-by: Miquel Raynal <miquel.raynal@bootlin.com>
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The fragmented files were not correctly read because of two issues:
- The squashfs_file_info struct has a field named 'comp', which tells if
the file's fragment is compressed or not. This field was always set to
'true' in sqfs_get_regfile_info and sqfs_get_lregfile_info. It should
actually take sqfs_frag_lookup's return value. This patch addresses
these two assignments.
- In sqfs_read, the fragments (compressed or not) were copied to the
output buffer through a for loop which was reading data at the wrong
offset. Replace these loops by equivalent calls to memcpy, with the
right parameters.
I tested this patch by comparing the MD5 checksum of a few fragmented
files with the respective md5sum output in sandbox, considering both
compressed and uncompressed fragments.
Signed-off-by: Joao Marcos Costa <jmcosta944@gmail.com>
Tested-by: Richard Genoud <richard.genoud@posteo.net>
Reviewed-by: Miquel Raynal <miquel.raynal@bootlin.com>
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When reading directories the UEFI sub-system must supply file attributes
and timestamps. These fields will have to be added to struct fs_dirent.
SquashFS should not fill these fields with random data. Ensure that they
are zeroed out.
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Reviewed-by: Miquel Raynal <miquel.raynal@bootlin.com>
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Commit 401d1c4f5d2d29c4bc4beaec95402ca23eb63295 ("common: Drop
asm/global_data.h from common header") broke compilation of squashfs
filesystem when CONFIG_CMD_SQUASHFS=y is enabled.
Compilation is failing on error:
aarch64-linux-gnu-ld.bfd: u-boot/fs/squashfs/sqfs_inode.c:121: undefined reference to `le32_to_cpu'
Fixes: 401d1c4f5d2d29c4bc4beaec95402ca23eb63295 ("common: Drop asm/global_data.h from common header")
Suggested-by: Tom Rini <trini@konsulko.com>
Signed-off-by: Pali Rohár <pali@kernel.org>
Reviewed-by: Tom Rini <trini@konsulko.com>
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sqfs_opendir() called in sqfs_size(), sqfs_read(), sqfs_exists() may fail
leading to sqfs_closedir(NULL) being called. Do not dereference NULL.
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
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SquashFS supports sprase blocks in files - that is, if a given block is
composed only of zeros, it's not written to the output file to save
space and it's on-disk length field is set to zero to indicate that.
Previously the squashfs driver did not recognise that, and would attempt
to read and decompress a zero-sized block, which obviously failed.
The following command may be used to create a file for testing:
cat <(dd if=/dev/urandom of=/dev/stdout bs=1M count=1) \
<(dd if=/dev/zero of=/dev/stdout bs=1M count=1) \
<(dd if=/dev/urandom of=/dev/stdout bs=1k count=200) >test_file
Signed-off-by: Campbell Suter <campbell@snapit.group>
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This will prevent a double free error if sqfs_close() is called twice.
Signed-off-by: Richard Genoud <richard.genoud@posteo.net>
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This permits to find a file and use the distro_bootcmd
Reviewed-by: Joao Marcos Costa <jmcosta944@gmail.com>
Signed-off-by: Richard Genoud <richard.genoud@posteo.net>
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offset is the offset in the file read, not the offset in the destination
buffer.
If the offset is not null, this will lead to a memory corruption.
So, for now, we are returning an error if the offset is used.
Signed-off-by: Richard Genoud <richard.genoud@posteo.net>
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The length of the buffer wasn't taken into account when writing to the
given buffer.
Signed-off-by: Richard Genoud <richard.genoud@posteo.net>
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sqfs_decompressor_init() returns a value, so it's better to use it than
to force the return value to EINVAL (it could be ENOMEM)
Reviewed-by: Joao Marcos Costa <jmcosta944@gmail.com>
Signed-off-by: Richard Genoud <richard.genoud@posteo.net>
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Resetting the context on error will prevent some checks like:
if (!ctx.cur_dev)
To pass when the probe method has failed
Signed-off-by: Richard Genoud <richard.genoud@posteo.net>
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If SquashFS magic number is invalid, there's a memory leak.
Reviewed-by: Joao Marcos Costa <jmcosta944@gmail.com>
Signed-off-by: Richard Genoud <richard.genoud@posteo.net>
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finfo.blk_sizes may not be freed in case of error in the for loop
Setting it to null and freeing it at the end makes prevents that from
happening.
Reviewed-by: Joao Marcos Costa <jmcosta944@gmail.com>
Signed-off-by: Richard Genoud <richard.genoud@posteo.net>
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if sqfs_tokenize(rel_tokens, rc, rel); fails, the function exits
without freeing the array base_tokens.
Reviewed-by: Joao Marcos Costa <jmcosta944@gmail.com>
Signed-off-by: Richard Genoud <richard.genoud@posteo.net>
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the return value of sqfs_tokenize(rel_tokens, rc, rel); wasn't checked.
(but "ret" value was !)
This is obviouly a typo.
Reviewed-by: Joao Marcos Costa <jmcosta944@gmail.com>
Signed-off-by: Richard Genoud <richard.genoud@posteo.net>
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For consistency with other functions.
Reviewed-by: Joao Marcos Costa <jmcosta944@gmail.com>
Signed-off-by: Richard Genoud <richard.genoud@posteo.net>
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data_buffer was allocated in a loop and freed only once.
Signed-off-by: Richard Genoud <richard.genoud@posteo.net>
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sqfs_closedir() should be called to free memory allocated by
sqfs_opendir()
Reviewed-by: Joao Marcos Costa <jmcosta944@gmail.com>
Signed-off-by: Richard Genoud <richard.genoud@posteo.net>
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as sqfs_opendir failed, there's no need to call sqfs_closedir
Signed-off-by: Richard Genoud <richard.genoud@posteo.net>
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dirs->entry shouldn't be left dangling as it could be freed twice.
Signed-off-by: Richard Genoud <richard.genoud@posteo.net>
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as sqfs_opendir failed, there's no need to call sqfs_closedir
Signed-off-by: Richard Genoud <richard.genoud@posteo.net>
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dirs->entry shouldn't be left dangling as it could be freed twice.
Signed-off-by: Richard Genoud <richard.genoud@posteo.net>
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memory allocation should always be checked
Reviewed-by: Joao Marcos Costa <jmcosta944@gmail.com>
Signed-off-by: Richard Genoud <richard.genoud@posteo.net>
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