Re: [PATCH] vsprintf: Do not break early boot with probing addresses

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To: Petr Mladek <pmladek@xxxxxxxx>
Subject: Re: [PATCH] vsprintf: Do not break early boot with probing addresses
From: Sergey Senozhatsky <sergey.senozhatsky.work@xxxxxxxxx>
Date: Fri, 10 May 2019 17:16:35 +0900
Cc: Sergey Senozhatsky <sergey.senozhatsky.work@xxxxxxxxx>, Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>, Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>, Rasmus Villemoes <linux@xxxxxxxxxxxxxxxxxx>, "Tobin C . Harding" <me@xxxxxxxx>, Michal Hocko <mhocko@xxxxxxx>, Sergey Senozhatsky <sergey.senozhatsky@xxxxxxxxx>, Steven Rostedt <rostedt@xxxxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx, Michael Ellerman <mpe@xxxxxxxxxxxxxx>, linuxppc-dev@xxxxxxxxxxxxxxxx, Russell Currey <ruscur@xxxxxxxxxx>, Christophe Leroy <christophe.leroy@xxxxxx>, Stephen Rothwell <sfr@xxxxxxxxxx>, Heiko Carstens <heiko.carstens@xxxxxxxxxx>, linux-arch@xxxxxxxxxxxxxxx, linux-s390@xxxxxxxxxxxxxxx, Martin Schwidefsky <schwidefsky@xxxxxxxxxx>
In-reply-to: <20190510080602.mdfk54f6lpyg6unw@pathway.suse.cz>
References: <20190509121923.8339-1-pmladek@suse.com> <20190510043200.GC15652@jagdpanzerIV> <CAHk-=wiP+hwSqEW0dM6AYNWUR7jXDkeueq69et6ahfUgV7hC3w@mail.gmail.com> <20190510050709.GA1831@jagdpanzerIV> <20190510080602.mdfk54f6lpyg6unw@pathway.suse.cz>
User-agent: Mutt/1.11.4 (2019-03-13)

On (05/10/19 10:06), Petr Mladek wrote:
[..]
> I am going to send a patch replacing probe_kernel_address() with
> a simple check:
> 
> 	if ((unsigned long)ptr < PAGE_SIZE || IS_ERR_VALUE(ptr))
> 		return "(efault)";

I'm OK with this.
Probing ptrs was a good idea, it just didn't work out.

	-ss

Follow-Ups:
- [PATCH] vsprintf: Do not break early boot with probing addresses
  - From: Petr Mladek

References:
- [PATCH] vsprintf: Do not break early boot with probing addresses
  - From: Petr Mladek
- Re: [PATCH] vsprintf: Do not break early boot with probing addresses
  - From: Sergey Senozhatsky
- Re: [PATCH] vsprintf: Do not break early boot with probing addresses
  - From: Sergey Senozhatsky
- Re: [PATCH] vsprintf: Do not break early boot with probing addresses
  - From: Petr Mladek

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