From: richard -rw- weinberger <richard.weinberger@gmail.com>
To: Andrew Lutomirski <luto@mit.edu>
Cc: Adrian Bunk <bunk@stusta.de>,
"H. Peter Anvin" <hpa@linux.intel.com>,
Linus Torvalds <torvalds@linux-foundation.org>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>,
x86@kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [3.1 patch] x86: default to vsyscall=native
Date: Thu, 6 Oct 2011 17:37:40 +0200 [thread overview]
Message-ID: <CAFLxGvx0Cpu0ePytdCSSzfO2or3ZL3j5QrghOE5eWHZCJt6C6g@mail.gmail.com> (raw)
In-Reply-To: <CAObL_7HL1M00D7XDCtMgO1kDSh64N7LvwB0DVd7c8Afi-Ki-Gw@mail.gmail.com>
[-- Attachment #1: Type: text/plain, Size: 603 bytes --]
On Thu, Oct 6, 2011 at 5:06 AM, Andrew Lutomirski <luto@mit.edu> wrote:
> I'll see how ugly the patch to get this all correct is. It may not be
> all that pretty because we won't be able to use sys_gettimeofday
> anymore.
BTW: The attached program triggers the issue.
on 3.1-rc8+:
# ./sig.dyn
faulting address: 0xdeadbeef
# ./sig.static
[ 19.075106] sig.static[863] vsyscall fault (exploit attempt?)
ip:ffffffffff600000 cs:33 sp:7fff9e53d8c8 ax:ffffffffff600000 si:0
di:deadbeef
faulting address: 0x0
I guess UML is not the only user of this feature...
--
Thanks,
//richard
[-- Attachment #2: sig.c --]
[-- Type: text/x-csrc, Size: 454 bytes --]
#include <stdio.h>
#include <stdlib.h>
#include <signal.h>
#include <sys/time.h>
static void sighandler(int sig, siginfo_t *si, void *uc)
{
printf("faulting address: 0x%lx\n", (unsigned long)si->si_addr);
exit(1);
}
int main()
{
struct sigaction sa;
sa.sa_sigaction = (void *)sighandler;
sigemptyset(&sa.sa_mask);
sa.sa_flags = SA_SIGINFO| SA_NODEFER;
sigaction(SIGSEGV, &sa, NULL);
gettimeofday((void *)0xdeadbeef, NULL);
return 0;
}
next prev parent reply other threads:[~2011-10-06 15:37 UTC|newest]
Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-10-03 9:08 [3.1 patch] x86: default to vsyscall=native Adrian Bunk
2011-10-03 13:04 ` Andrew Lutomirski
2011-10-03 17:33 ` Adrian Bunk
2011-10-03 18:06 ` Andrew Lutomirski
2011-10-03 18:41 ` Adrian Bunk
2011-10-05 22:13 ` Andrew Lutomirski
2011-10-05 22:22 ` richard -rw- weinberger
2011-10-05 22:30 ` Adrian Bunk
2011-10-05 22:41 ` richard -rw- weinberger
2011-10-05 22:46 ` Andrew Lutomirski
2011-10-05 23:36 ` Andrew Lutomirski
2011-10-06 3:06 ` Andrew Lutomirski
2011-10-06 12:12 ` richard -rw- weinberger
2011-10-06 15:37 ` richard -rw- weinberger [this message]
2011-10-06 18:16 ` Andrew Lutomirski
2011-10-06 18:34 ` Linus Torvalds
2011-10-07 0:48 ` Andrew Lutomirski
2011-10-10 11:19 ` richard -rw- weinberger
2011-10-10 11:48 ` Ingo Molnar
2011-10-10 15:31 ` Andrew Lutomirski
2011-10-11 6:22 ` Ingo Molnar
2011-10-11 17:24 ` [RFC] fixing the UML failure root cause Andrew Lutomirski
2011-10-13 6:19 ` Linus Torvalds
2011-10-13 8:40 ` Andrew Lutomirski
2011-10-14 4:46 ` Linus Torvalds
2011-10-14 6:30 ` Andrew Lutomirski
2011-10-14 20:10 ` Linus Torvalds
2011-10-21 21:01 ` [PATCH] x86-64: Set siginfo and context on vsyscall emulation faults Andy Lutomirski
2011-10-22 4:46 ` Linus Torvalds
2011-10-22 9:07 ` Andy Lutomirski
2011-11-08 0:33 ` [PATCH 0/2] Fix and re-enable vsyscall=emulate Andy Lutomirski
2011-11-08 0:33 ` [PATCH 1/2] x86-64: Set siginfo and context on vsyscall emulation faults Andy Lutomirski
2011-12-05 13:23 ` [tip:x86/asm] " tip-bot for Andy Lutomirski
2011-11-08 0:33 ` [PATCH 2/2] x86: Default to vsyscall=emulate Andy Lutomirski
2011-12-05 13:24 ` [tip:x86/asm] " tip-bot for Andy Lutomirski
2011-12-02 22:47 ` [PATCH 0/2] Fix and re-enable vsyscall=emulate Andy Lutomirski
2011-12-05 11:18 ` H. Peter Anvin
2011-10-14 19:53 ` [RFC] fixing the UML failure root cause richard -rw- weinberger
2011-10-14 20:17 ` Andrew Lutomirski
2011-10-14 20:23 ` richard -rw- weinberger
2011-10-14 20:31 ` Andrew Lutomirski
2011-10-14 20:39 ` richard -rw- weinberger
2011-10-14 22:28 ` richard -rw- weinberger
2011-10-15 16:57 ` Ingo Molnar
2011-10-05 22:24 ` [3.1 patch] x86: default to vsyscall=native Adrian Bunk
2011-10-03 13:19 ` richard -rw- weinberger
2011-10-03 17:46 ` Adrian Bunk
2011-10-05 21:40 Adrian Bunk
2011-10-05 22:01 ` Thomas Gleixner
2011-10-09 13:45 ` Adrian Bunk
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=CAFLxGvx0Cpu0ePytdCSSzfO2or3ZL3j5QrghOE5eWHZCJt6C6g@mail.gmail.com \
--to=richard.weinberger@gmail.com \
--cc=bunk@stusta.de \
--cc=hpa@linux.intel.com \
--cc=linux-kernel@vger.kernel.org \
--cc=luto@mit.edu \
--cc=mingo@redhat.com \
--cc=tglx@linutronix.de \
--cc=torvalds@linux-foundation.org \
--cc=x86@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).