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Date: Mon, 2 Mar 2009 14:46:44 +0800
From: Eugene Teo <>
Subject: CVE request: kernel: x86-64: syscall-audit: 32/64 syscall hole

On x86-64, a 32-bit process (TIF_IA32) can switch to 64-bit mode with
ljmp, and then use the "syscall" instruction to make a 64-bit system
call.  A 64-bit process make a 32-bit system call with int $0x80.

In both these cases, audit_syscall_entry() will use the wrong system
call number table and the wrong system call argument registers.  This
could be used to circumvent a syscall audit configuration that filters
based on the syscall numbers or argument details.

Credit: Roland McGrath.

References: summary syscall-audit seccomp

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