From 78004e9a87f240df03e2f73120d291763c32e0a7 Mon Sep 17 00:00:00 2001 From: Ali Ahmet Memis Date: Fri, 21 Aug 2026 01:45:27 +0000 Subject: openrisc: fix arbitrary kernel memory access via or1k_atomic syscall sys_or1k_atomic() (syscall 244 in the "or1k" ABI) takes two user pointers, v1 and v2, and swaps the words they point to in hand-written assembly. l.lwz r29,0(r4) l.lwz r27,0(r5) l.sw 0(r4),r27 l.sw 0(r5),r29 The pointers are not checked with access_ok(). The four memory accesses also have no exception table entries. A caller passes a kernel address as either pointer, and the syscall reads from and writes to it directly. This gives an unprivileged process a kernel read/write primitive. It overwrites kernel data such as the sys_call_table, gaining code execution in kernel context. Check both pointers before entering the critical section. Add fixups for the four memory accesses so faults on valid but unmapped user addresses return -EFAULT. [shorne@gmail.com: fix comment style] Fixes: 9d02a4283e9c ("OpenRISC: Boot code") Cc: stable@vger.kernel.org Signed-off-by: Ali Ahmet Memis Signed-off-by: Stafford Horne --- 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