linux-kernel - [patch part-II V2 04/13] x86/entry/64: Trace irqflags unconditionally as ON when returning to user space

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: Windows password security audit tool. GUI, reports in PDF.

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

Date:   Sun, 08 Mar 2020 23:24:03 +0100
From:   Thomas Gleixner <tglx@...utronix.de>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     x86@...nel.org, Steven Rostedt <rostedt@...dmis.org>,
        Brian Gerst <brgerst@...il.com>,
        Juergen Gross <jgross@...e.com>,
        Frederic Weisbecker <frederic@...nel.org>,
        Alexandre Chartre <alexandre.chartre@...cle.com>
Subject: [patch part-II V2 04/13] x86/entry/64: Trace irqflags unconditionally as ON when returning to user space

User space cannot longer disable interrupts so trace return to user space
unconditionally as IRQS_ON.

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
---
V2: Cover 32bit as well
---
 arch/x86/entry/entry_32.S |    2 +-
 arch/x86/entry/entry_64.S |    4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)

--- a/arch/x86/entry/entry_32.S
+++ b/arch/x86/entry/entry_32.S
@@ -1088,7 +1088,7 @@ SYM_FUNC_START(entry_INT80_32)
 	STACKLEAK_ERASE
 
 restore_all:
-	TRACE_IRQS_IRET
+	TRACE_IRQS_ON
 	SWITCH_TO_ENTRY_STACK
 	CHECK_AND_APPLY_ESPFIX
 
--- a/arch/x86/entry/entry_64.S
+++ b/arch/x86/entry/entry_64.S
@@ -174,7 +174,7 @@ SYM_INNER_LABEL(entry_SYSCALL_64_after_h
 	movq	%rsp, %rsi
 	call	do_syscall_64		/* returns with IRQs disabled */
 
-	TRACE_IRQS_IRETQ		/* we're about to change IF */
+	TRACE_IRQS_ON			/* return enables interrupts */
 
 	/*
 	 * Try to use SYSRET instead of IRET if we're returning to
@@ -619,7 +619,7 @@ SYM_CODE_START_LOCAL(common_interrupt)
 .Lretint_user:
 	mov	%rsp,%rdi
 	call	prepare_exit_to_usermode
-	TRACE_IRQS_IRETQ
+	TRACE_IRQS_ON
 
 SYM_INNER_LABEL(swapgs_restore_regs_and_return_to_usermode, SYM_L_GLOBAL)
 #ifdef CONFIG_DEBUG_ENTRY