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Changelog for building SHA-256 and 512 with old libc

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Linux/Aarch64: support SHA acceleration detection with older libc

On Linux on aarch64 (64-bit ARMv8) processors, we use getauxval() to detect
whether the runtime environment supports SHA-256 or SHA-512 acceleration.
Some libc do not define the necessary HWCAP_xxx constants to analyze the
result of getauxval(), either because they don't bother or because they're
too old to recognize the values we need (for example, HWCAP_SHA2 appeared in
Glibc 2.24 and HWCAP_SHA512 appeared in Glibc 2.27). In such cases, assume
that the values are the same as in the kernel ABI and define the constants
manually.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
This commit is contained in:
Gilles Peskine 2023-02-16 23:40:40 +01:00 committed by Dave Rodgman
parent 47c74a4773
commit cbb9caead4
1 changed files with 4 additions and 0 deletions
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Bugfix
* On Linux on ARMv8, fix a build error with SHA-256 and SHA-512
acceleration detection when the libc headers do not define the
corresponding constant. Reported by valord577.