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From: Andy Lutomirski <luto@kernel.org>
To: x86@kernel.org, linux-kernel@vger.kernel.org
Cc: Brad Spengler <spender@grsecurity.net>,
	Denys Vlasenko <dvlasenk@redhat.com>,
	Andy Lutomirski <luto@kernel.org>
Subject: [PATCH 5/9] x86, traps: Use user_mode_ignore_vm86 where appropriate
Date: Wed, 18 Mar 2015 18:33:31 -0700	[thread overview]
Message-ID: <0b324d5b75c3402be07f8d3c6245ed7f4995029e.1426728647.git.luto@kernel.org> (raw)
In-Reply-To: <cover.1426728647.git.luto@kernel.org>
In-Reply-To: <cover.1426728647.git.luto@kernel.org>

A few of the user_mode checks in traps.c are immediately after
explicit checks for vm86 mode.  Change them to
user_mode_ignore_vm86.

Signed-off-by: Andy Lutomirski <luto@kernel.org>
---
 arch/x86/kernel/traps.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/x86/kernel/traps.c b/arch/x86/kernel/traps.c
index 081252c44cde..376fc1562bd1 100644
--- a/arch/x86/kernel/traps.c
+++ b/arch/x86/kernel/traps.c
@@ -208,7 +208,7 @@ do_trap_no_signal(struct task_struct *tsk, int trapnr, char *str,
 		return -1;
 	}
 #endif
-	if (!user_mode(regs)) {
+	if (!user_mode_ignore_vm86(regs)) {
 		if (!fixup_exception(regs)) {
 			tsk->thread.error_code = error_code;
 			tsk->thread.trap_nr = trapnr;
@@ -471,7 +471,7 @@ do_general_protection(struct pt_regs *regs, long error_code)
 #endif
 
 	tsk = current;
-	if (!user_mode(regs)) {
+	if (!user_mode_ignore_vm86(regs)) {
 		if (fixup_exception(regs))
 			goto exit;
 
@@ -688,7 +688,7 @@ dotraplinkage void do_debug(struct pt_regs *regs, long error_code)
 	 * We already checked v86 mode above, so we can check for kernel mode
 	 * by just checking the CPL of CS.
 	 */
-	if ((dr6 & DR_STEP) && !user_mode(regs)) {
+	if ((dr6 & DR_STEP) && !user_mode_ignore_vm86(regs)) {
 		tsk->thread.debugreg6 &= ~DR_STEP;
 		set_tsk_thread_flag(tsk, TIF_SINGLESTEP);
 		regs->flags &= ~X86_EFLAGS_TF;
-- 
2.3.0


  parent reply	other threads:[~2015-03-19  1:35 UTC|newest]

Thread overview: 31+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-03-19  1:33 [PATCH 0/9] user_mode_vm removal and associated cleanups Andy Lutomirski
2015-03-19  1:33 ` [PATCH 1/9] x86, fault: Use TASK_SIZE_MAX in is_prefetch Andy Lutomirski
2015-03-23 12:20   ` [tip:x86/asm] x86/mm/fault: Use TASK_SIZE_MAX in is_prefetch() tip-bot for Andy Lutomirski
2015-03-19  1:33 ` [PATCH 2/9] x86, perf: Fix incorrect TIF_IA32 check in code_segment_base Andy Lutomirski
2015-03-23 12:20   ` [tip:x86/asm] x86/asm/entry, perf: Fix incorrect TIF_IA32 check in code_segment_base() tip-bot for Andy Lutomirski
2015-03-19  1:33 ` [PATCH 3/9] x86: Add user_mode_ignore_vm86 Andy Lutomirski
2015-03-23 12:26   ` [tip:x86/asm] x86/asm/entry: Add user_mode_ignore_vm86() tip-bot for Andy Lutomirski
2015-03-23 19:38     ` Andy Lutomirski
2015-03-24 19:44       ` Ingo Molnar
2015-03-24 19:46         ` Andy Lutomirski
2015-03-27 13:48           ` Denys Vlasenko
2015-03-29  7:08             ` Ingo Molnar
2015-03-29  9:02               ` [PATCH] x86/asm/entry: Remove user_mode_ignore_vm86() Ingo Molnar
2015-03-29 12:13                 ` Borislav Petkov
2015-03-29 13:24                   ` Andy Lutomirski
2015-03-31 12:39                 ` [tip:x86/asm] " tip-bot for Ingo Molnar
2015-03-29 11:55               ` [tip:x86/asm] x86/asm/entry: Add user_mode_ignore_vm86() Borislav Petkov
2015-03-29 20:51               ` Denys Vlasenko
2015-03-19  1:33 ` [PATCH 4/9] x86, perf: Explicitly optimize vm86 handling in code_segment_base Andy Lutomirski
2015-03-23 12:26   ` [tip:x86/asm] x86/asm/entry, perf: Explicitly optimize vm86 handling in code_segment_base() tip-bot for Andy Lutomirski
2015-03-19  1:33 ` Andy Lutomirski [this message]
2015-03-23 12:27   ` [tip:x86/asm] x86/asm/entry: Use user_mode_ignore_vm86() where appropriate tip-bot for Andy Lutomirski
2015-03-19  1:33 ` [PATCH 6/9] x86: Make user_mode work correctly if regs came from vm86 mode Andy Lutomirski
2015-03-23 12:27   ` [tip:x86/asm] x86/asm/entry: Make user_mode() work correctly if regs came from VM86 mode tip-bot for Andy Lutomirski
2015-03-19  1:33 ` [PATCH 7/9] x86, treewide: s/user_mode_vm/user_mode/g Andy Lutomirski
2015-03-23 12:27   ` [tip:x86/asm] x86/asm/entry: Change all 'user_mode_vm()' calls to 'user_mode()' tip-bot for Andy Lutomirski
2015-03-19  1:33 ` [PATCH 8/9] x86: Remove user_mode_vm Andy Lutomirski
2015-03-23 12:28   ` [tip:x86/asm] x86/asm/entry: Remove user_mode_vm() tip-bot for Andy Lutomirski
2015-03-19  1:33 ` [PATCH 9/9] x86, traps: Replace some open-coded vm86 checks with v8086_mode Andy Lutomirski
2015-03-23 12:28   ` [tip:x86/asm] x86/asm/entry: Replace some open-coded VM86 checks with v8086_mode() checks tip-bot for Andy Lutomirski
2015-03-19  6:33 ` [PATCH 0/9] user_mode_vm removal and associated cleanups Ingo Molnar

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