git: e698e4a53773 - main - lib/libmd: disable SHA1 AVX2 kernel

The branch main has been updated by fuz:

URL: https://cgit.FreeBSD.org/src/commit/?id=e698e4a537736f6a7dd9a386e00997d7fb08e83f

commit e698e4a537736f6a7dd9a386e00997d7fb08e83f
Author:     Robert Clausecker <fuz@FreeBSD.org>
AuthorDate: 2025-06-02 22:54:32 +0000
Commit:     Robert Clausecker <fuz@FreeBSD.org>
CommitDate: 2025-06-02 23:27:00 +0000

    lib/libmd: disable SHA1 AVX2 kernel
    
    Seems like there is a bug lurking somewhere in the code.  This was not
    caught during my testing.  Disable the affected kernel for now while I
    figure out what is wrong with it.
    
    To reproduce, run
    
        jot -s '' -b 'a' -n 1000000 | sha1
    
    This should yield 34aa973cd4c4daa4f61eeb2bdbad27316534016f, but gives
    fe161a71d7941e3d63a9cacadc4f20716a721944 with the broken code.  Only the
    amd64/avx2 kernel is affected, the others seem to operate correctly.
    
    Reported by:    olivier
    Fixes:          8b4684afcde3930eb49490f0b8431c4cb2ad9a46
---
 lib/libmd/amd64/sha1dispatch.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/lib/libmd/amd64/sha1dispatch.c b/lib/libmd/amd64/sha1dispatch.c
index 86509195d56e..6c4d43b95ac9 100644
--- a/lib/libmd/amd64/sha1dispatch.c
+++ b/lib/libmd/amd64/sha1dispatch.c
@@ -47,8 +47,10 @@ DEFINE_UIFUNC(, void, sha1_block, (SHA1_CTX *, const void *, size_t))
 {
 	if (cpu_stdext_feature & CPUID_STDEXT_SHA)
 		return (_libmd_sha1block_shani);
+#if 0
 	if ((cpu_stdext_feature & AVX2_STDEXT_NEEDED) == AVX2_STDEXT_NEEDED)
 		return (sha1block_avx2_wrapper);
+#endif
 	else
 		return (_libmd_sha1block_scalar);
 }