From 4617721c502b2ddaa4e324e86da4997edf738fa5 Mon Sep 17 00:00:00 2001 From: Steven Rostedt Date: Wed, 2 Sep 2026 09:55:01 -0400 Subject: ftrace: Synchronize the initialization of ftrace_ops There's some internal state that ftrace_ops needs to have set, but since it can be declared outside of the ftrace.c code, it calls ftrace_ops_init() on the ops in every global function. The issue is that if two tasks call it on the same ops at the same time it is possible to have the initialization of one corrupt the initialization of the other call. Create a ops_mutex to use to synchronize every initialization of the ftrace_ops. The mutex is taken within checking the ftrace_ops flag that states it was initializied but the flag is checked again after the mutex has been taken. Checking first outside the mutex allows it to shortcut having to take the mutex. But then the check needs to be done again after the mute is taken in case of races. Cc: stable@vger.kernel.org Link: https://patch.msgid.link/20260902095501.6b59af20@gandalf.local.home Fixes: f04f24fb7e48d ("ftrace, kprobes: Fix a deadlock on ftrace_regex_lock") Reported-by: sashiko-bot@kernel.org Close: https://lore.kernel.org/all/20260829025528.49A831F000E9@smtp.kernel.org/ Signed-off-by: Steven Rostedt --- Documentation/crypto/libcrypto-hash.rst | 88 +++++++++++++++++++++++++++++++++ 1 file changed, 88 insertions(+) create mode 100644 Documentation/crypto/libcrypto-hash.rst (limited to 'Documentation/crypto/libcrypto-hash.rst') diff --git a/Documentation/crypto/libcrypto-hash.rst b/Documentation/crypto/libcrypto-hash.rst new file mode 100644 index 000000000..fa4c54236 --- /dev/null +++ b/Documentation/crypto/libcrypto-hash.rst @@ -0,0 +1,88 @@ +.. SPDX-License-Identifier: GPL-2.0-or-later + +Hash functions, MACs, and XOFs +============================== + +AES-CMAC and AES-XCBC-MAC +------------------------- + +This API provides support for the AES-CMAC and AES-XCBC-MAC message +authentication codes. + +.. kernel-doc:: include/crypto/aes-cbc-macs.h + +BLAKE2b +------- + +This API provides support for the BLAKE2b cryptographic hash function. + +.. kernel-doc:: include/crypto/blake2b.h + +BLAKE2s +------- + +This API provides support for the BLAKE2s cryptographic hash function. + +.. kernel-doc:: include/crypto/blake2s.h + +GHASH and POLYVAL +----------------- + +This API provides support for the GHASH and POLYVAL universal hash functions. +These algorithms are used only as internal components of other algorithms. + +.. kernel-doc:: include/crypto/gf128hash.h + +MD5 +--- + +This API provides support for the MD5 cryptographic hash function and HMAC-MD5. +This algorithm is obsolete and is supported only for backwards compatibility. + +.. kernel-doc:: include/crypto/md5.h + +NH +-- + +This API provides support for the NH universal hash function. This algorithm is +used only as an internal component of other algorithms. + +.. kernel-doc:: include/crypto/nh.h + +Poly1305 +-------- + +This API provides support for the Poly1305 universal hash function. This +algorithm is used only as an internal component of other algorithms. + +.. kernel-doc:: include/crypto/poly1305.h + +SHA-1 +----- + +This API provides support for the SHA-1 cryptographic hash function and +HMAC-SHA1. This algorithm is obsolete and is supported only for backwards +compatibility. + +.. kernel-doc:: include/crypto/sha1.h + +SHA-2 +----- + +This API provides support for the SHA-2 family of cryptographic hash functions, +including SHA-224, SHA-256, SHA-384, and SHA-512. This also includes their +corresponding HMACs: HMAC-SHA224, HMAC-SHA256, HMAC-SHA384, and HMAC-SHA512. + +.. kernel-doc:: include/crypto/sha2.h + +SHA-3 +----- + +The SHA-3 API is documented in :ref:`sha3`. + +SM3 +--- + +This API provides support for the SM3 cryptographic hash function. + +.. kernel-doc:: include/crypto/sm3.h -- cgit v1.3.1