From: linux at dominikbrodowski.net (Dominik Brodowski)
Subject: [Linux-kselftest-mirror] [PATCH 2/5] selftests/x86: fix vDSO selftest segfault for vsyscall=none
Date: Sun, 11 Feb 2018 14:00:29 +0100 [thread overview]
Message-ID: <20180211130029.GA23754@light.dominikbrodowski.net> (raw)
In-Reply-To: <20180211121714.GA11096@isilmar-4.linta.de>
On Sun, Feb 11, 2018 at 01:17:14PM +0100, Dominik Brodowski wrote:
> On Sun, Feb 11, 2018 at 12:21:53PM +0100, Ingo Molnar wrote:
> >
> > * Dominik Brodowski <linux at dominikbrodowski.net> wrote:
> >
> > > + char name[128];
> > > + if (sscanf(line, "%p-%p %c-%cp %*x %*x:%*x %*u %s",
> > > + &start, &end, &r, &x, name) != 5)
> >
> > So that's a buffer overflow waiting to happen, if a line in 'maps' gets too large,
> > right?
>
> ... as does tools/testing/selftests/x86/test_vsyscall.c already now, right?
> Will fix both up with an additional patch.
Maybe no fix is needed after all: The fgets() call a few lines above
limits "line" to 127 chars max. So "name" can't even get close to 128
chars, right?
char line[128];
...
while (fgets(line, sizeof(line), maps)) {
Thanks,
Dominik
--
To unsubscribe from this list: send the line "unsubscribe linux-kselftest" in
the body of a message to majordomo at vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
WARNING: multiple messages have this Message-ID (diff)
From: linux@dominikbrodowski.net (Dominik Brodowski)
Subject: [Linux-kselftest-mirror] [PATCH 2/5] selftests/x86: fix vDSO selftest segfault for vsyscall=none
Date: Sun, 11 Feb 2018 14:00:29 +0100 [thread overview]
Message-ID: <20180211130029.GA23754@light.dominikbrodowski.net> (raw)
Message-ID: <20180211130029.AY3HyZ9vsGDMwSAH7vaCXOaUzm9UWnpGzP7FLbQ9TIs@z> (raw)
In-Reply-To: <20180211121714.GA11096@isilmar-4.linta.de>
On Sun, Feb 11, 2018@01:17:14PM +0100, Dominik Brodowski wrote:
> On Sun, Feb 11, 2018@12:21:53PM +0100, Ingo Molnar wrote:
> >
> > * Dominik Brodowski <linux@dominikbrodowski.net> wrote:
> >
> > > + char name[128];
> > > + if (sscanf(line, "%p-%p %c-%cp %*x %*x:%*x %*u %s",
> > > + &start, &end, &r, &x, name) != 5)
> >
> > So that's a buffer overflow waiting to happen, if a line in 'maps' gets too large,
> > right?
>
> ... as does tools/testing/selftests/x86/test_vsyscall.c already now, right?
> Will fix both up with an additional patch.
Maybe no fix is needed after all: The fgets() call a few lines above
limits "line" to 127 chars max. So "name" can't even get close to 128
chars, right?
char line[128];
...
while (fgets(line, sizeof(line), maps)) {
Thanks,
Dominik
--
To unsubscribe from this list: send the line "unsubscribe linux-kselftest" in
the body of a message to majordomo at vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
next prev parent reply other threads:[~2018-02-11 13:00 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-02-11 11:10 [Linux-kselftest-mirror] [PATCH 0/5] selftests/x86: fixes for !CONFIG_IA32_EMULATION and vsyscall=none linux
2018-02-11 11:10 ` Dominik Brodowski
2018-02-11 11:10 ` [Linux-kselftest-mirror] [PATCH 1/5] selftests/x86: 5lvl test has been moved linux
2018-02-11 11:10 ` Dominik Brodowski
2018-02-11 11:10 ` [Linux-kselftest-mirror] [PATCH 2/5] selftests/x86: fix vDSO selftest segfault for vsyscall=none linux
2018-02-11 11:10 ` Dominik Brodowski
2018-02-11 11:21 ` mingo
2018-02-11 11:21 ` Ingo Molnar
2018-02-11 12:17 ` linux
2018-02-11 12:17 ` Dominik Brodowski
2018-02-11 13:00 ` linux [this message]
2018-02-11 13:00 ` Dominik Brodowski
2018-02-11 18:24 ` mingo
2018-02-11 18:24 ` Ingo Molnar
2018-02-11 20:59 ` [Linux-kselftest-mirror] [PATCH] selftests/x86: clarify that there is no buffer overflow on sscanf usage linux
2018-02-11 20:59 ` Dominik Brodowski
2018-02-12 17:58 ` shuah
2018-02-12 17:58 ` Shuah Khan
2018-02-11 11:10 ` [Linux-kselftest-mirror] [PATCH 3/5] selftests/x86: do not rely on int $0x80 in test_mremap_vdso.c linux
2018-02-11 11:10 ` Dominik Brodowski
2018-02-11 11:10 ` [Linux-kselftest-mirror] [PATCH 4/5] selftests/x86: do not rely on int $0x80 in single_step_syscall.c linux
2018-02-11 11:10 ` Dominik Brodowski
2018-02-11 11:10 ` [Linux-kselftest-mirror] [PATCH 5/5] selftests/x86: disable tests requiring 32bit support on pure 64bit systems linux
2018-02-11 11:10 ` Dominik Brodowski
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=20180211130029.GA23754@light.dominikbrodowski.net \
--to=linux-kselftest@vger.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).