Re: [PATCH 0/2] Multiarch hooks for memcpy variants

[Szabolcs Nagy <szabolcs dot nagy at arm dot com>]

On 14/08/17 13:14, Siddhesh Poyarekar wrote:
> Allowing a PLT only for __memcpy_chk and mempcpy would need a test case
> waiver in check_localplt and that would become a blanket OK for PLT

i only proposed plt for this specific case on
the grounds that i expect _chk to be obsoleted
and instead the check will be in user code
(which has the same semantics as if plt was
used in libc, the memcpy call is interposable)

> usage for memcpy, which we don't want.  Hence my patch is probably the
> best compromise, especially since there is precedent for the approach in
> x86.

it is probably best from performance point
of view.

but i'm not yet convinced that __memcpy_chk is
performance critical, if not, then i'd rather
not add ifuncs.

does anyone know how commonly distros build
with _FORTIFY_SOURCE?