linux

iv/linux

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Roberto Sassu b30282c3bc evm: Check also if *tfm is an error pointer in init_desc()

[ Upstream commit 53de3b080d5eae31d0de219617155dcc34e7d698 ]

This patch avoids a kernel panic due to accessing an error pointer set by
crypto_alloc_shash(). It occurs especially when there are many files that
require an unsupported algorithm, as it would increase the likelihood of
the following race condition:

Task A: *tfm = crypto_alloc_shash() <= error pointer
Task B: if (*tfm == NULL) <= *tfm is not NULL, use it
Task B: rc = crypto_shash_init(desc) <= panic
Task A: *tfm = NULL

This patch uses the IS_ERR_OR_NULL macro to determine whether or not a new
crypto context must be created.

Cc: stable@vger.kernel.org
Fixes: d46eb3699502b ("evm: crypto hash replaced by shash")
Co-developed-by: Krzysztof Struczynski <krzysztof.struczynski@huawei.com>
Signed-off-by: Krzysztof Struczynski <krzysztof.struczynski@huawei.com>
Signed-off-by: Roberto Sassu <roberto.sassu@huawei.com>
Signed-off-by: Mimi Zohar <zohar@linux.ibm.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

2020-05-27 16:40:23 +02:00

apparmor

apparmor: fix module parameters can be changed after policy is locked

2019-11-25 15:54:22 +01:00

integrity

evm: Check also if *tfm is an error pointer in init_desc()

2020-05-27 16:40:23 +02:00

keys

KEYS: reaching the keys quotas correctly

2020-04-24 07:57:11 +02:00

selinux

selinux: properly handle multiple messages in selinux_netlink_send()