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linux/debian/patches/patchset-pf/steady/0013-crypto-x86-aegis-Fix-sleeping-when-disallowed-on-PRE.patch

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From 127ab7f801b3ec9cf94d2436ef1f579a1fc09dd6 Mon Sep 17 00:00:00 2001
From: Eric Biggers <ebiggers@kernel.org>
Date: Tue, 8 Jul 2025 12:38:28 -0700
Subject: crypto: x86/aegis - Fix sleeping when disallowed on PREEMPT_RT
skcipher_walk_done() can call kfree(), which takes a spinlock, which
makes it incorrect to call while preemption is disabled on PREEMPT_RT.
Therefore, end the kernel-mode FPU section before calling
skcipher_walk_done(), and restart it afterwards.
Moreover, pass atomic=false to skcipher_walk_aead_encrypt() instead of
atomic=true. The point of atomic=true was to make skcipher_walk_done()
safe to call while in a kernel-mode FPU section, but that does not
actually work. So just use the usual atomic=false.
Fixes: 1d373d4e8e15 ("crypto: x86 - Add optimized AEGIS implementations")
Cc: stable@vger.kernel.org
Signed-off-by: Eric Biggers <ebiggers@kernel.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
---
arch/x86/crypto/aegis128-aesni-glue.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
--- a/arch/x86/crypto/aegis128-aesni-glue.c
+++ b/arch/x86/crypto/aegis128-aesni-glue.c
@@ -119,7 +119,9 @@ crypto_aegis128_aesni_process_crypt(stru
walk->dst.virt.addr,
round_down(walk->nbytes,
AEGIS128_BLOCK_SIZE));
+ kernel_fpu_end();
skcipher_walk_done(walk, walk->nbytes % AEGIS128_BLOCK_SIZE);
+ kernel_fpu_begin();
}
if (walk->nbytes) {
@@ -131,7 +133,9 @@ crypto_aegis128_aesni_process_crypt(stru
aegis128_aesni_dec_tail(state, walk->src.virt.addr,
walk->dst.virt.addr,
walk->nbytes);
+ kernel_fpu_end();
skcipher_walk_done(walk, 0);
+ kernel_fpu_begin();
}
}
@@ -176,9 +180,9 @@ crypto_aegis128_aesni_crypt(struct aead_
struct aegis_state state;
if (enc)
- skcipher_walk_aead_encrypt(&walk, req, true);
+ skcipher_walk_aead_encrypt(&walk, req, false);
else
- skcipher_walk_aead_decrypt(&walk, req, true);
+ skcipher_walk_aead_decrypt(&walk, req, false);
kernel_fpu_begin();