linux-kernel - Re: [PATCH 06/13] kexec: New syscall kexec_file

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20140605095603.GD3876@dhcp-17-89.nay.redhat.com>
Date:	Thu, 5 Jun 2014 17:56:03 +0800
From:	WANG Chao <chaowang@...hat.com>
To:	Vivek Goyal <vgoyal@...hat.com>
Cc:	linux-kernel@...r.kernel.org, kexec@...ts.infradead.org,
	ebiederm@...ssion.com, hpa@...or.com, mjg59@...f.ucam.org,
	greg@...ah.com, bp@...en8.de, jkosina@...e.cz, dyoung@...hat.com,
	bhe@...hat.com, akpm@...ux-foundation.org
Subject: Re: [PATCH 06/13] kexec: New syscall kexec_file_load() declaration

On 06/03/14 at 09:06am, Vivek Goyal wrote:
> This is the new syscall kexec_file_load() declaration/interface. I have
> reserved the syscall number only for x86_64 so far. Other architectures
> (including i386) can reserve syscall number when they enable the support
> for this new syscall.

Hi, Vivek

I have a comment below about the kexec_file_load args.

[..]
> diff --git a/kernel/kexec.c b/kernel/kexec.c
> index c435c5f..a3044e6 100644
> --- a/kernel/kexec.c
> +++ b/kernel/kexec.c
> @@ -1098,6 +1098,13 @@ COMPAT_SYSCALL_DEFINE4(kexec_load, compat_ulong_t, entry,
>  }
>  #endif
>  
> +SYSCALL_DEFINE5(kexec_file_load, int, kernel_fd, int, initrd_fd,
> +		const char __user *, cmdline_ptr, unsigned long,
> +		cmdline_len, unsigned long, flags)

initrd is optional for system boot.

How about using int *kernel_fd and int *initrd_fd as the argument? Then
if I don't need initrd, in userspace I can do this:

kexec_file_load(&kernel_fd, NULL, ...)

And even you can remove KEXEC_FILE_UNLOAD flag, because you could tell
that one wants to unload if the following is invoked:

kexec_file_load(NULL, NULL, ...)

Thanks
WANG Chao
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/