Bug 453394 - [RHEL5.2]: Running strace with a bad syscall doesn't return -ENOSYS
Summary: [RHEL5.2]: Running strace with a bad syscall doesn't return -ENOSYS
Alias: None
Product: Red Hat Enterprise Linux 5
Classification: Red Hat
Component: kernel-xen
Version: 5.2
Hardware: All
OS: Linux
Target Milestone: rc
: ---
Assignee: Chris Lalancette
QA Contact: Martin Jenner
: 459442 461349 (view as bug list)
Depends On:
Blocks: 449772 470853
TreeView+ depends on / blocked
Reported: 2008-06-30 11:18 UTC by Chris Lalancette
Modified: 2009-01-20 19:35 UTC (History)
4 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Last Closed: 2009-01-20 19:35:15 UTC
Target Upstream Version:

Attachments (Terms of Use)

System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2009:0225 0 normal SHIPPED_LIVE Important: Red Hat Enterprise Linux 5.3 kernel security and bug fix update 2009-01-20 16:06:24 UTC

Description Chris Lalancette 2008-06-30 11:18:42 UTC
Description of problem:
If you take the following program:

#include <stdio.h>
#include <stdlib.h>
#include <sys/syscall.h>
#include <sys/types.h>

int main()
        int foo;

        foo = syscall(289);

        fprintf(stderr, "Error is %d\n",foo);

        return 0;

and compile and run it on the RHEL 5.2 xen kernel, you will get -1 as the output
from the syscall, since 289 is not a valid syscall in RHEL-5.  Now, if you take
that same program and run it under strace, you will get a return value of 289,
which is wrong.  This is because of a minor bug in
arch/x86_64/kernel/entry-xen.S, where if we are tracing the syscall, we copy
that syscall number into the return instead of the appropriate -ENOSYS.  This
bug is also present in the upstream Xen 2.6.18 kernel, but is fixed in the
upstream Linux kernel.

Comment 1 Chris Lalancette 2008-06-30 11:44:30 UTC
Oh, I should mention that this came out of the discussion of BZ 442352, although
I do not believe it is the root cause of that issue.

Chris Lalancette

Comment 2 RHEL Program Management 2008-06-30 11:57:31 UTC
This request was evaluated by Red Hat Product Management for inclusion in a Red
Hat Enterprise Linux maintenance release.  Product Management has requested
further review of this request by Red Hat Engineering, for potential
inclusion in a Red Hat Enterprise Linux Update release for currently deployed
products.  This request is not yet committed for inclusion in an Update

Comment 4 Don Zickus 2008-07-18 20:07:50 UTC
in kernel-2.6.18-98.el5
You can download this test kernel from http://people.redhat.com/dzickus/el5

Comment 5 Chris Lalancette 2008-08-28 18:59:19 UTC
*** Bug 459442 has been marked as a duplicate of this bug. ***

Comment 9 Orion Poplawski 2008-09-08 14:24:38 UTC
*** Bug 461349 has been marked as a duplicate of this bug. ***

Comment 16 errata-xmlrpc 2009-01-20 19:35:15 UTC
An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on therefore solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.


Note You need to log in before you can comment on or make changes to this bug.