user/sven/linux.git/crypto/api.c, branch v5.4.29

crypto: api - Fix race condition in crypto_spawn_alg

2020-02-11T12:35:31Z

commit 73669cc556462f4e50376538d77ee312142e8a8a upstream. The function crypto_spawn_alg is racy because it drops the lock before shooting the dying algorithm. The algorithm could disappear altogether before we shoot it. This patch fixes it by moving the shooting into the locked section. Fixes: 6bfd48096ff8 ("[CRYPTO] api: Added spawns") Signed-off-by: Herbert Xu Signed-off-by: Greg Kroah-Hartman

crypto: api - fix unexpectedly getting generic implementation

2020-02-11T12:35:30Z

commit 2bbb3375d967155bccc86a5887d4a6e29c56b683 upstream. When CONFIG_CRYPTO_MANAGER_EXTRA_TESTS=y, the first lookup of an algorithm that needs to be instantiated using a template will always get the generic implementation, even when an accelerated one is available. This happens because the extra self-tests for the accelerated implementation allocate the generic implementation for comparison purposes, and then crypto_alg_tested() for the generic implementation "fulfills" the original request (i.e. sets crypto_larval::adult). This patch fixes this by only fulfilling the original request if we are currently the best outstanding larval as judged by the priority. If we're not the best then we will ask all waiters on that larval request to retry the lookup. Note that this patch introduces a behaviour change when the module providing the new algorithm is unregistered during the process. Previously we would have failed with ENOENT, after the patch we will instead redo the lookup. Fixes: 9a8a6b3f0950 ("crypto: testmgr - fuzz hashes against...") Fixes: d435e10e67be ("crypto: testmgr - fuzz skciphers against...") Fixes: 40153b10d91c ("crypto: testmgr - fuzz AEADs against...") Reported-by: Eric Biggers Signed-off-by: Herbert Xu Reviewed-by: Eric Biggers Signed-off-by: Herbert Xu Signed-off-by: Greg Kroah-Hartman

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152

2019-05-30T18:26:32Z

Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 3029 file(s). Signed-off-by: Thomas Gleixner Reviewed-by: Allison Randal Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de Signed-off-by: Greg Kroah-Hartman

evm: Don't deadlock if a crypto algorithm is unavailable

2018-07-18T11:27:22Z

When EVM attempts to appraise a file signed with a crypto algorithm the kernel doesn't have support for, it will cause the kernel to trigger a module load. If the EVM policy includes appraisal of kernel modules this will in turn call back into EVM - since EVM is holding a lock until the crypto initialisation is complete, this triggers a deadlock. Add a CRYPTO_NOLOAD flag and skip module loading if it's set, and add that flag in the EVM case in order to fail gracefully with an error message instead of deadlocking. Signed-off-by: Matthew Garrett Acked-by: Herbert Xu Signed-off-by: Mimi Zohar

crypto: api - fix finding algorithm currently being tested

2018-04-20T16:24:02Z

Commit eb02c38f0197 ("crypto: api - Keep failed instances alive") is making allocating crypto transforms sometimes fail with ELIBBAD, when multiple processes try to access encrypted files with fscrypt for the first time since boot. The problem is that the "request larval" for the algorithm is being mistaken for an algorithm which failed its tests. Fix it by only returning ELIBBAD for "non-larval" algorithms. Also don't leak a reference to the algorithm. Fixes: eb02c38f0197 ("crypto: api - Keep failed instances alive") Signed-off-by: Eric Biggers Signed-off-by: Herbert Xu

crypto: api - Keep failed instances alive

2018-03-30T17:32:58Z

This patch reverts commit 9c521a200bc3 ("crypto: api - remove instance when test failed") and fixes the underlying problem in a different way. To recap, prior to the reverted commit, an instance that fails a self-test is kept around. However, it would satisfy any new lookups against its name and therefore the system may accumlulate an unbounded number of failed instances for the same algorithm name. The reverted commit fixed it by unregistering the instance. Hoever, this still does not prevent the creation of the same failed instance over and over again each time the name is looked up. This patch fixes it by keeping the failed instance around, just as we would if it were a normal algorithm. However, the lookup code has been udpated so that we do not attempt to create another instance as long as this failed one is still registered. Of course, you could still force a new creation by deleting the instance from user-space. A new error (ELIBBAD) has been commandeered for this purpose and will be returned when all registered algorithm of a given name have failed the self-test. Signed-off-by: Herbert Xu

crypto: api - Make crypto_alg_lookup static

2018-03-30T17:32:58Z

The function crypto_alg_lookup is only usd within the crypto API and should be not be exported to the modules. This patch marks it as a static function. Signed-off-by: Herbert Xu

crypto: api - Remove unused crypto_type lookup function

2018-03-30T17:32:57Z

The lookup function in crypto_type was only used for the implicit IV generators which have been completely removed from the crypto API. This patch removes the lookup function as it is now useless. Signed-off-by: Herbert Xu

crypto: algapi - convert cra_refcnt to refcount_t

2018-01-05T07:43:09Z

Reference counters should use refcount_t rather than atomic_t, since the refcount_t implementation can prevent overflows, reducing the exploitability of reference leak bugs. crypto_alg.cra_refcount is a reference counter with the usual semantics, so switch it over to refcount_t. Signed-off-by: Eric Biggers Signed-off-by: Herbert Xu

crypto: api - Unexport crypto_larval_lookup()

2017-12-22T08:29:06Z

crypto_larval_lookup() is not used outside of crypto/api.c, so unexport it and mark it 'static'. Signed-off-by: Eric Biggers Signed-off-by: Herbert Xu