Kees Cook ce469db094 pstore/ram: Correctly calculate usable PRZ bytes ... [ Upstream commit 89d328f637 ] The actual number of bytes stored in a PRZ is smaller than the bytes requested by platform data, since there is a header on each PRZ. Additionally, if ECC is enabled, there are trailing bytes used as well. Normally this mismatch doesn't matter since PRZs are circular buffers and the leading "overflow" bytes are just thrown away. However, in the case of a compressed record, this rather badly corrupts the results. This corruption was visible with "ramoops.mem_size=204800 ramoops.ecc=1". Any stored crashes would not be uncompressable (producing a pstorefs "dmesg-*.enc.z" file), and triggering errors at boot: [ 2.790759] pstore: crypto_comp_decompress failed, ret = -22! Backporting this depends on commit 70ad35db33 ("pstore: Convert console write to use ->write_buf") Reported-by: Joel Fernandes <joel@joelfernandes.org> Fixes: b0aad7a99c ("pstore: Add compression support to pstore") Signed-off-by: Kees Cook <keescook@chromium.org> Reviewed-by: Joel Fernandes (Google) <joel@joelfernandes.org> Signed-off-by: Sasha Levin <sashal@kernel.org>		2018-12-17 09:24:39 +01:00
..
ftrace.c	pstore: Remove write_buf() callback	2017-03-07 14:01:02 -08:00
inode.c	vfs: change inode times to use struct timespec64	2018-06-05 16:57:31 -07:00
internal.h	pstore: Select compression at runtime	2018-03-07 12:43:35 -08:00
Kconfig	pstore: add zstd compression support	2018-08-03 18:12:18 -07:00
Makefile	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
platform.c	pstore: add zstd compression support	2018-08-03 18:12:18 -07:00
pmsg.c	pstore: Create common record initializer	2017-05-31 10:13:44 -07:00
ram.c	pstore/ram: Correctly calculate usable PRZ bytes	2018-12-17 09:24:39 +01:00
ram_core.c	pstore: Fix incorrect persistent ram buffer mapping	2018-09-13 09:14:57 -07:00