linux-kernel - Re: [PATCH v2 05/17] vdso: Avoid call to memset() by getrandom

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Message-ID: <e5a36d98-c880-4d33-954a-2a05240ef02f@csgroup.eu>
Date: Thu, 29 Aug 2024 19:36:38 +0200
From: Christophe Leroy <christophe.leroy@...roup.eu>
To: Segher Boessenkool <segher@...nel.crashing.org>,
 Ard Biesheuvel <ardb@...nel.org>
Cc: Arnd Bergmann <arnd@...db.de>, "Jason A . Donenfeld" <Jason@...c4.com>,
 Eric Biggers <ebiggers@...nel.org>, Michael Ellerman <mpe@...erman.id.au>,
 Nicholas Piggin <npiggin@...il.com>, Naveen N Rao <naveen@...nel.org>,
 Andy Lutomirski <luto@...nel.org>, Thomas Gleixner <tglx@...utronix.de>,
 Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
 Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
 "H. Peter Anvin" <hpa@...or.com>, Theodore Ts'o <tytso@....edu>,
 Andrew Morton <akpm@...ux-foundation.org>,
 Steven Rostedt <rostedt@...dmis.org>, Masami Hiramatsu
 <mhiramat@...nel.org>, Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
 Vincenzo Frascino <vincenzo.frascino@....com>, shuah <shuah@...nel.org>,
 linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
 linux-fsdevel@...r.kernel.org, Linux-Arch <linux-arch@...r.kernel.org>,
 linux-mm@...ck.org, linux-trace-kernel@...r.kernel.org,
 linux-kselftest@...r.kernel.org
Subject: Re: [PATCH v2 05/17] vdso: Avoid call to memset() by getrandom

Le 28/08/2024 à 19:25, Segher Boessenkool a écrit :
> 
>> Not sure about static binaries, though: do those even use the VDSO?
> 
> With "static binary" people usually mean "a binary not using any DSOs",
> I think the VDSO is a DSO, also in this respect?  As always, -static
> builds are *way* less problematic (and faster and smaller :-) )
> 

AFAIK on powerpc even static binaries use the vDSO, otherwise signals 
don't work.

Christophe