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2023-12-09 b22da3d8526a935aa31e086e63f60ff3246cb61c

 kernel/tools/testing/selftests/x86/syscall_nt.c
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@@ -1,15 +1,7 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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 /*
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  * syscall_nt.c - checks syscalls with NT set
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  * Copyright (c) 2014-2015 Andrew Lutomirski
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- *
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- * This program is free software; you can redistribute it and/or modify
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- * it under the terms and conditions of the GNU General Public License,
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- * version 2, as published by the Free Software Foundation.
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- *
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- * This program is distributed in the hope it will be useful, but
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- * WITHOUT ANY WARRANTY; without even the implied warranty of
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- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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- * General Public License for more details.
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  *
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  * Some obscure user-space code requires the ability to make system calls
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  * with FLAGS.NT set.  Make sure it works.
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@@ -21,28 +13,10 @@
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 #include <signal.h>
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 #include <err.h>
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 #include <sys/syscall.h>
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-#include <asm/processor-flags.h>
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-#ifdef __x86_64__
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-# define WIDTH "q"
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-#else
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-# define WIDTH "l"
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-#endif
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+#include "helpers.h"
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18
 
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 static unsigned int nerrs;
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-
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-static unsigned long get_eflags(void)
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-{
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-	unsigned long eflags;
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-	asm volatile ("pushf" WIDTH "\n\tpop" WIDTH " %0" : "=rm" (eflags));
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-	return eflags;
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-}
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-
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-static void set_eflags(unsigned long eflags)
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-{
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-	asm volatile ("push" WIDTH " %0\n\tpopf" WIDTH
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-		      : : "rm" (eflags) : "flags");
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-}
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 static void sethandler(int sig, void (*handler)(int, siginfo_t *, void *),
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 		       int flags)
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@@ -82,6 +56,12 @@
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 	printf("[RUN]\tSet NT and issue a syscall\n");
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 	do_it(X86_EFLAGS_NT);
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+	printf("[RUN]\tSet AC and issue a syscall\n");
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+	do_it(X86_EFLAGS_AC);
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+
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+	printf("[RUN]\tSet NT|AC and issue a syscall\n");
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+	do_it(X86_EFLAGS_NT | X86_EFLAGS_AC);
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+
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 	/*
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 	 * Now try it again with TF set -- TF forces returns via IRET in all
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 	 * cases except non-ptregs-using 64-bit full fast path syscalls.
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@@ -89,8 +69,28 @@
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 	sethandler(SIGTRAP, sigtrap, 0);
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+	printf("[RUN]\tSet TF and issue a syscall\n");
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+	do_it(X86_EFLAGS_TF);
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+
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 	printf("[RUN]\tSet NT|TF and issue a syscall\n");
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 	do_it(X86_EFLAGS_NT | X86_EFLAGS_TF);
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+	printf("[RUN]\tSet AC|TF and issue a syscall\n");
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+	do_it(X86_EFLAGS_AC | X86_EFLAGS_TF);
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+
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+	printf("[RUN]\tSet NT|AC|TF and issue a syscall\n");
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+	do_it(X86_EFLAGS_NT | X86_EFLAGS_AC | X86_EFLAGS_TF);
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+
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+	/*
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+	 * Now try DF.  This is evil and it's plausible that we will crash
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+	 * glibc, but glibc would have to do something rather surprising
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+	 * for this to happen.
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+	 */
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+	printf("[RUN]\tSet DF and issue a syscall\n");
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+	do_it(X86_EFLAGS_DF);
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+
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+	printf("[RUN]\tSet TF|DF and issue a syscall\n");
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+	do_it(X86_EFLAGS_TF | X86_EFLAGS_DF);
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+
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 	return nerrs == 0 ? 0 : 1;
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 }