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Message-ID: <200607310325_MC3-1-C691-D76B@compuserve.com> Date: Mon, 31 Jul 2006 03:22:42 -0400 From: Chuck Ebbert <76306.1226@...puserve.com> To: Andi Kleen <ak@...e.de> Cc: Albert Cahalan <acahalan@...il.com>, linux-kernel <linux-kernel@...r.kernel.org> Subject: [patch] x86_64: fix is_at_popf() for compat tasks When testing for the REX instruction prefix, first check for a 32-bit task because in compat mode the REX prefix is an increment instruction. Signed-off-by: Chuck Ebbert <76306.1226@...puserve.com> --- Compiled and booted but needs a test case... --- 2.6.18-rc2-64.orig/arch/x86_64/kernel/ptrace.c +++ 2.6.18-rc2-64/arch/x86_64/kernel/ptrace.c @@ -141,8 +141,11 @@ static int is_at_popf(struct task_struct case 0xf0: case 0xf2: case 0xf3: continue; - /* REX prefixes */ case 0x40 ... 0x4f: + if (is_compat_task()) + /* register increment */ + return 0; + /* REX prefix */ continue; /* CHECKME: f0, f2, f3 */ -- Chuck - 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/
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