Vasily Gorbik 7ab41c2c08 s390/decompressor: specify __decompress() buf len to avoid overflow ... Historically calls to __decompress() didn't specify "out_len" parameter on many architectures including s390, expecting that no writes beyond uncompressed kernel image are performed. This has changed since commit 2aa14b1ab2 ("zstd: import usptream v1.5.2") which includes zstd library commit 6a7ede3dfccb ("Reduce size of dctx by reutilizing dst buffer (#2751)"). Now zstd decompression code might store literal buffer in the unwritten portion of the destination buffer. Since "out_len" is not set, it is considered to be unlimited and hence free to use for optimization needs. On s390 this might corrupt initrd or ipl report which are often placed right after the decompressor buffer. Luckily the size of uncompressed kernel image is already known to the decompressor, so to avoid the problem simply specify it in the "out_len" parameter. Link: https://github.com/facebook/zstd/commit/6a7ede3dfccb Signed-off-by: Vasily Gorbik <gor@linux.ibm.com> Tested-by: Alexander Egorenkov <egorenar@linux.ibm.com> Link: https://lore.kernel.org/r/patch-1.thread-41c676.git-41c676c2d153.your-ad-here.call-01675030179-ext-9637@work.hours Signed-off-by: Heiko Carstens <hca@linux.ibm.com>		2023-01-31 18:54:21 +01:00
..
appldata	s390/appldata: remove power management callbacks	2022-12-02 18:25:04 +01:00
boot	s390/decompressor: specify __decompress() buf len to avoid overflow	2023-01-31 18:54:21 +01:00
configs	s390: update defconfigs	2023-01-11 21:26:40 +01:00
crypto	crypto: Kconfig - simplify cipher entries	2022-08-26 18:50:43 +08:00
hypfs	s390/hypfs: remove unused info_blk_hdr__pcpus() function	2022-11-23 16:24:07 +01:00
include	s390/percpu: add READ_ONCE() to arch_this_cpu_to_op_simple()	2023-01-11 15:28:47 +01:00
kernel	s390: workaround invalid gcc-11 out of bounds read warning	2023-01-17 19:00:59 +01:00
kvm	KVM: s390: interrupt: use READ_ONCE() before cmpxchg()	2023-01-11 15:28:47 +01:00
lib	s390/uaccess: add missing EX_TABLE entries to __clear_user()	2022-10-26 14:47:30 +02:00
mm	ARM64:	2022-12-15 11:12:21 -08:00
net	s390/bpf: Fix typo in comment	2022-05-23 11:25:53 -07:00
pci	IOMMU Updates for Linux v6.2	2022-12-19 08:34:39 -06:00
purgatory	s390/purgatory: remove duplicated build rule of kexec-purgatory.o	2022-06-30 14:18:16 +02:00
tools	KVM: s390: Add facility 197 to the allow list	2022-07-13 15:25:25 +02:00
Kbuild	kbuild: use more subdir- for visiting subdirectories while cleaning	2021-10-24 13:49:46 +09:00
Kconfig	s390 updates for 6.2 merge window	2022-12-12 11:04:08 -08:00
Kconfig.debug	s390/Kconfig.debug: fix indentation	2022-06-01 12:03:15 +02:00
Makefile	s390: always build relocatable kernel	2022-11-08 19:32:32 +01:00