linux-kernel - Re: [PATCH] Allow times and time system calls to return small negative values

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: <18743.46549.833800.667962@cargo.ozlabs.ibm.com>
Date:	Thu, 4 Dec 2008 21:49:57 +1100
From:	Paul Mackerras <paulus@...ba.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	Joakim.Tjernlund@...nsmode.se
Subject: Re: [PATCH] Allow times and time system calls to return small
	negative values

Ingo Molnar writes:

> > +	force_successful_syscall_return();
> >  	return compat_jiffies_to_clock_t(jiffies);
> 
> just curious: what code does force_successful_syscall_return() actually 
> run in the powerpc case - those bits are missing from this patch. I 
> suspect it sets some sort of flag?

It sets the TIF_NOERROR thread flag, which is tested in the syscall
exit path along with various other thread flags.

force_successful_syscall_return() is defined for powerpc in
arch/powerpc/include/asm/ptrace.h.  It's nothing new, it has existed
for ages and is used in a few other places already.  It has existing
non-null definitions on alpha, ia64, powerpc, and sparc64.

Paul.
--
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/