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Subject: [Bug 218987] [patch][linux] panic in linux_sys_futex() with
 FUTEX_WAKE_OP
Date: Mon, 01 May 2017 09:36:43 +0000
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D218987

            Bug ID: 218987
           Summary: [patch][linux] panic in linux_sys_futex() with
                    FUTEX_WAKE_OP
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Keywords: patch
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs@FreeBSD.org
          Reporter: luke.tw@gmail.com
          Keywords: patch

Created attachment 182207
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=3D182207&action=
=3Dedit
patch for linux_sys_futex()

In linux compat layer, the syscall futex does not handle FUTEX_WAKE_OP well
when using the same address for arguments uaddr and uaddr2.=20

The following linux program can result in kernel panic.

#define _GNU_SOURCE
#include <stdio.h>
#include <errno.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/wait.h>
#include <sys/mman.h>
#include <sys/syscall.h>

#include <linux/futex.h>
#include <sys/time.h>

static int
futex(int *uaddr, int futex_op, int val,
                int val2, int *uaddr2, int val3)
{
        return syscall(SYS_futex, uaddr, futex_op, val,
                        val2, uaddr, val3);
}

int main(void){
        int ret;
        int addr;

        ret =3D futex(&addr, FUTEX_WAKE_OP, 1, 1, &addr, 2);
        printf("ret: %d\n", ret);
}

--=20
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