Date: Wed, 10 Feb 2010 21:02:05 +0800 From: Eugene Teo <eugene@...hat.com> To: oss-security@...ts.openwall.com CC: "Steven M. Christey" <coley@...us.mitre.org> Subject: Re: CVE request - kernel: race in ptrace On 02/09/2010 02:34 PM, Eugene Teo wrote: > Discovered by Tavis Ormandy. "The race involves interaction between a > tracer, a tracee and an antagonist. The tracer is tracing the tracee > with PTRACE_SYSCALL and waits on the tracee. In the mean time, an > antagonist blasts the tracee with SIGCONTs. > > The observed issue is that sometimes when the tracer attempts to > continue the tracee with PTRACE_SYSCALL, it gets a return value of > -ESRCH, indicating that the tracee is already running (or not being > traced). It turns out that a SIGCONT wakes up the tracee in kernel mode, > and for a moment the tracee's state is TASK_RUNNING then in ptrace_stop > we hit the condition where the tracee is found to be running (and thus > not traced). If the syscall is repeated, the > second time it usually succeeds (because by that time, the tracee has > been put into TASK_TRACED)." > > http://lkml.org/lkml/2010/2/8/327 > https://bugzilla.redhat.com/show_bug.cgi?id=563073 Hold on with assigning a CVE name for this. We are still investigating this issue. Thanks, Eugene -- Eugene Teo / Red Hat Security Response Team
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