From 6668ed271eaefaa63e686bdfbedaeb7b8e492722 Mon Sep 17 00:00:00 2001 From: Kumar Kartikeya Dwivedi Date: Fri, 4 Sep 2026 10:43:19 +0200 Subject: selftests/bpf: Reject graph kptr use after RCU unlock Add a sleepable verifier test that loads a graph-node local kptr in an explicit RCU read-side critical section, then passes its node to bpf_rbtree_remove() after the section ends. Before the verifier fix, the stale NON_OWN_REF flag makes the node look like a live borrowed reference and the program is accepted. After the fix, the pointer is demoted without NON_OWN_REF and the graph kfunc argument is rejected. Also exercise a graph kptr loaded while a spin lock provides implicit RCU protection. The pointer must be invalidated when the lock is released, which guards the required ordering between non-owning-reference invalidation and RCU demotion. Update the existing fault-protected load test state description. The post-unlock pointer no longer carries NON_OWN_REF, but remains readable because the load is rewritten to use BPF_PROBE_MEM. Signed-off-by: Kumar Kartikeya Dwivedi Link: https://lore.kernel.org/r/20260904084325.52250-7-memxor@gmail.com Signed-off-by: Alexei Starovoitov --- arch/arm/crypto/Kconfig | 63 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 63 insertions(+) create mode 100644 arch/arm/crypto/Kconfig (limited to 'arch/arm/crypto/Kconfig') diff --git a/arch/arm/crypto/Kconfig b/arch/arm/crypto/Kconfig new file mode 100644 index 000000000..f884b8b2f --- /dev/null +++ b/arch/arm/crypto/Kconfig @@ -0,0 +1,63 @@ +# SPDX-License-Identifier: GPL-2.0 + +menu "Accelerated Cryptographic Algorithms for CPU (arm)" + +config CRYPTO_GHASH_ARM_CE + tristate "AEAD cipher: AES in GCM mode (ARMv8 Crypto Extensions)" + depends on KERNEL_MODE_NEON + select CRYPTO_AEAD + select CRYPTO_LIB_AES + select CRYPTO_LIB_GF128MUL + help + AEAD cipher: AES-GCM + + Architecture: arm using + - ARMv8 Crypto Extensions + +config CRYPTO_AES_ARM_BS + tristate "Ciphers: AES, modes: ECB/CBC/CTR/XTS (bit-sliced NEON)" + depends on KERNEL_MODE_NEON + select CRYPTO_SKCIPHER + select CRYPTO_LIB_AES + help + Length-preserving ciphers: AES cipher algorithms (FIPS-197) + with block cipher modes: + - ECB (Electronic Codebook) mode (NIST SP800-38A) + - CBC (Cipher Block Chaining) mode (NIST SP800-38A) + - CTR (Counter) mode (NIST SP800-38A) + - XTS (XOR Encrypt XOR with ciphertext stealing) mode (NIST SP800-38E + and IEEE 1619) + + Bit sliced AES gives around 45% speedup on Cortex-A15 for CTR mode + and for XTS mode encryption, CBC and XTS mode decryption speedup is + around 25%. (CBC encryption speed is not affected by this driver.) + + The bit sliced AES code does not use lookup tables, so it is believed + to be invulnerable to cache timing attacks. However, since the bit + sliced AES code cannot process single blocks efficiently, in certain + cases table-based code with some countermeasures against cache timing + attacks will still be used as a fallback method; specifically CBC + encryption (not CBC decryption), the encryption of XTS tweaks, XTS + ciphertext stealing when the message isn't a multiple of 16 bytes, and + CTR when invoked in a context in which NEON instructions are unusable. + +config CRYPTO_AES_ARM_CE + tristate "Ciphers: AES, modes: ECB/CBC/CTS/CTR/XTS (ARMv8 Crypto Extensions)" + depends on KERNEL_MODE_NEON + select CRYPTO_SKCIPHER + select CRYPTO_LIB_AES + help + Length-preserving ciphers: AES cipher algorithms (FIPS-197) + with block cipher modes: + - ECB (Electronic Codebook) mode (NIST SP800-38A) + - CBC (Cipher Block Chaining) mode (NIST SP800-38A) + - CTR (Counter) mode (NIST SP800-38A) + - CTS (Cipher Text Stealing) mode (NIST SP800-38A) + - XTS (XOR Encrypt XOR with ciphertext stealing) mode (NIST SP800-38E + and IEEE 1619) + + Architecture: arm using: + - ARMv8 Crypto Extensions + +endmenu + -- cgit v1.3.1