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linux/lib/crypto
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Eric Biggers e5046823f8 lib/crypto: chacha: Zeroize permuted_state before it leaves scope 
Since the ChaCha permutation is invertible, the local variable
'permuted_state' is sufficient to compute the original 'state', and thus
the key, even after the permutation has been done.

While the kernel is quite inconsistent about zeroizing secrets on the
stack (and some prominent userspace crypto libraries don't bother at all
since it's not guaranteed to work anyway), the kernel does try to do it
as a best practice, especially in cases involving the RNG.

Thus, explicitly zeroize 'permuted_state' before it goes out of scope.

Fixes: c08d0e6473 ("crypto: chacha20 - Add a generic ChaCha20 stream cipher implementation")
Cc: stable@vger.kernel.org
Acked-by: Ard Biesheuvel <ardb@kernel.org>
Link: https://lore.kernel.org/r/20260326032920.39408-1-ebiggers@kernel.org
Signed-off-by: Eric Biggers <ebiggers@kernel.org>
 		2026-03-27 13:35:35 -07:00
..
arm lib/crypto: arm/aes: Migrate optimized code into library 2026-01-12 11:39:58 -08:00
arm64 lib/crypto: arm64/aes: Migrate optimized code into library 2026-01-12 11:39:58 -08:00
mips lib/crypto: chacha: Consolidate into single module 2025-08-29 09:50:19 -07:00
mpi Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
powerpc lib/crypto: powerpc/aes: Fix rndkey_from_vsx() on big endian CPUs 2026-02-18 13:38:14 -08:00
riscv lib/crypto: riscv/aes: Migrate optimized code into library 2026-01-12 11:39:58 -08:00
s390 lib/crypto: s390/aes: Migrate optimized code into library 2026-01-15 14:08:55 -08:00
sparc lib/crypto: sparc/aes: Migrate optimized code into library 2026-01-15 14:09:07 -08:00
tests lib/crypto: tests: Depend on library options rather than selecting them 2026-02-28 19:17:30 -08:00
x86 lib/crypto: x86/aes: Add AES-NI optimization 2026-01-15 14:09:07 -08:00
.kunitconfig lib/crypto: tests: Add a .kunitconfig file 2026-03-02 15:35:05 -08:00
Kconfig lib/crypto: x86/aes: Add AES-NI optimization 2026-01-15 14:09:07 -08:00
Makefile lib/crypto: powerpc: Add powerpc/aesp8-ppc.S to clean-files 2026-03-17 09:27:11 -07:00
aes.c lib/crypto: aes: Drop 'volatile' from aes_sbox and aes_inv_sbox 2026-01-15 14:09:09 -08:00
aescfb.c lib/crypto: aescfb: Use new AES library API 2026-01-15 14:09:08 -08:00
aesgcm.c lib/crypto: aesgcm: Use new AES library API 2026-01-15 14:09:09 -08:00
arc4.c lib/crypto: Explicitly include <linux/export.h> 2025-06-30 09:26:19 -07:00
blake2b.c lib/crypto: blake2b: Roll up BLAKE2b round loop on 32-bit 2025-12-09 15:10:21 -08:00
blake2s.c lib/crypto: blake2s: Replace manual unrolling with unrolled_full 2025-12-09 15:10:21 -08:00
chacha-block-generic.c lib/crypto: chacha: Zeroize permuted_state before it leaves scope 2026-03-27 13:35:35 -07:00
chacha.c lib/crypto: chacha: Consolidate into single module 2025-08-29 09:50:19 -07:00
chacha20poly1305-selftest.c crypto: lib/chacha - strongly type the ChaCha state 2025-05-12 13:32:53 +08:00
chacha20poly1305.c lib/crypto: chacha20poly1305: Statically check fixed array lengths 2025-11-23 12:19:21 -08:00
curve25519-fiat32.c move asm/unaligned.h to linux/unaligned.h 2024-10-02 17:23:23 -04:00
curve25519-hacl64.c move asm/unaligned.h to linux/unaligned.h 2024-10-02 17:23:23 -04:00
curve25519.c lib/crypto: curve25519: Consolidate into single module 2025-09-06 16:32:43 -07:00
des.c lib/crypto: Explicitly include <linux/export.h> 2025-06-30 09:26:19 -07:00
fips-mldsa.h lib/crypto: mldsa: Add FIPS cryptographic algorithm self-test 2026-01-12 11:07:50 -08:00
fips.h lib/crypto: sha3: Add FIPS cryptographic algorithm self-test 2025-11-05 20:02:35 -08:00
gf128mul.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
hash_info.c lib/crypto: hash_info: Move hash_info.c into lib/crypto/ 2025-07-08 12:03:44 -07:00
md5.c lib/crypto: md5: Use rol32() instead of open-coding it 2026-01-12 11:07:50 -08:00
memneq.c lib/crypto: Explicitly include <linux/export.h> 2025-06-30 09:26:19 -07:00
mldsa.c lib/crypto: mldsa: Clarify the documentation for mldsa_verify() slightly 2026-02-03 19:28:51 -08:00
nh.c lib/crypto: nh: Add NH library 2026-01-12 11:07:49 -08:00
poly1305-donna32.c lib/crypto: Explicitly include <linux/export.h> 2025-06-30 09:26:19 -07:00
poly1305-donna64.c lib/crypto: Explicitly include <linux/export.h> 2025-06-30 09:26:19 -07:00
poly1305.c lib/crypto: poly1305: Consolidate into single module 2025-08-29 09:49:18 -07:00
polyval.c lib/crypto: polyval: Add POLYVAL library 2025-11-11 11:03:38 -08:00
sha1.c lib/crypto: sha1: Remove low-level functions from API 2026-01-27 15:47:41 -08:00
sha3.c lib/crypto: sha3: Support arch overrides of one-shot digest functions 2025-11-05 20:02:35 -08:00
sha256.c lib/crypto: Add FIPS self-tests for SHA-1 and SHA-2 2025-10-29 22:04:24 -07:00
sha512.c lib/crypto: Add FIPS self-tests for SHA-1 and SHA-2 2025-10-29 22:04:24 -07:00
simd.c crypto: api - move crypto_simd_disabled_for_test to lib 2024-10-28 18:33:11 +08:00
sm3.c lib/crypto: Explicitly include <linux/export.h> 2025-06-30 09:26:19 -07:00
utils.c lib/crypto: Explicitly include <linux/export.h> 2025-06-30 09:26:19 -07:00