linux-kernel - Re: [PATCH v3] selftests/vDSO: Explicit unsigned char conversion for elf

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Message-ID: <CAFhGd8rAW4Mkctq5VkcfVjw_yr=jVdXaWbYXP-vmeVpw7q4ruQ@mail.gmail.com>
Date: Mon, 6 May 2024 10:16:00 -0700
From: Justin Stitt <justinstitt@...gle.com>
To: David Laight <David.Laight@...lab.com>
Cc: Edward Liaw <edliaw@...gle.com>, 
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, Shuah Khan <shuah@...nel.org>, 
	Nathan Chancellor <nathan@...nel.org>, Nick Desaulniers <ndesaulniers@...gle.com>, 
	Bill Wendling <morbo@...gle.com>, "H. Peter Anvin" <hpa@...ux.intel.com>, Andy Lutomirski <luto@....edu>, 
	"linux-kselftest@...r.kernel.org" <linux-kselftest@...r.kernel.org>, 
	"kernel-team@...roid.com" <kernel-team@...roid.com>, "llvm@...ts.linux.dev" <llvm@...ts.linux.dev>
Subject: Re: [PATCH v3] selftests/vDSO: Explicit unsigned char conversion for elf_hash

On Sun, May 5, 2024 at 6:21 AM David Laight <David.Laight@...lab.com> wrote:
>
> From: Justin Stitt
> > Sent: 01 May 2024 20:55
> ...
> > > static unsigned long elf_hash(const unsigned char *name)
> ...
> > Is it possible to just change the types of the parameters of vdso_sym()
> > or does that trigger even more warnings on the callsites of vdso_sym()?
>
> Isn't the problem the definition of elf_hash()?
> A '\0' terminated string really ought to be 'char *' not 'unsigned char *'.

Right, although note this comment just about its definition:

/* Straight from the ELF specification. */
static unsigned long elf_hash(const unsigned char *name)
{

which indeed matches [1]

[1]: https://man.freebsd.org/cgi/man.cgi?query=elf_hash&sektion=3&apropos=0&manpath=FreeBSD+7.1-RELEASE

>
>         David
>
> -
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