crypto: sa2ul - use crypto_memneq() to compare AEAD tag

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Use crypto_memneq() for a constant-time comparison.

sa_aead_dma_in_callback() compares the computed authentication tag
against the received tag with memcmp(), which short-circuits on the
first differing byte. An attacker who can submit decrypt requests and
observe completion latency could recover the expected tag byte by byte.

Valid tag forgery for AEAD breaks the INT-CTXT guarantee.

Assisted-by: gregkh_clanker_t1000
Signed-off-by: David C.C.M. Gall <david.ccm.gall@googlemail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

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David C.C.M. Gall 2026-08-07 17:44:16 +02:00 • committed by Herbert Xu

parent 528bc53c3b

commit 7064af16d2

1 changed files with 2 additions and 1 deletions

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drivers/crypto/sa2ul.c

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