linux-kernel - [PATCH AUTOSEL 4.19 076/244] x86/mm: Remove in_nmi() warning from 64-bit implementation of vmalloc

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]

Message-Id: <20190522192630.24917-76-sashal@kernel.org>
Date:   Wed, 22 May 2019 15:23:42 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Jiri Kosina <jkosina@...e.cz>, Nicolai Stange <nstange@...e.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Andy Lutomirski <luto@...nel.org>,
        Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Frederic Weisbecker <fweisbec@...il.com>,
        Joerg Roedel <jroedel@...e.de>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...nel.org>, Sasha Levin <sashal@...nel.org>
Subject: [PATCH AUTOSEL 4.19 076/244] x86/mm: Remove in_nmi() warning from 64-bit implementation of vmalloc_fault()

From: Jiri Kosina <jkosina@...e.cz>

[ Upstream commit a65c88e16f32aa9ef2e8caa68ea5c29bd5eb0ff0 ]

In-NMI warnings have been added to vmalloc_fault() via:

  ebc8827f75 ("x86: Barf when vmalloc and kmemcheck faults happen in NMI")

back in the time when our NMI entry code could not cope with nested NMIs.

These days, it's perfectly fine to take a fault in NMI context and we
don't have to care about the fact that IRET from the fault handler might
cause NMI nesting.

This warning has already been removed from 32-bit implementation of
vmalloc_fault() in:

  6863ea0cda8 ("x86/mm: Remove in_nmi() warning from vmalloc_fault()")

but the 64-bit version was omitted.

Remove the bogus warning also from 64-bit implementation of vmalloc_fault().

Reported-by: Nicolai Stange <nstange@...e.de>
Signed-off-by: Jiri Kosina <jkosina@...e.cz>
Acked-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Cc: Andy Lutomirski <luto@...nel.org>
Cc: Borislav Petkov <bp@...en8.de>
Cc: Dave Hansen <dave.hansen@...ux.intel.com>
Cc: Frederic Weisbecker <fweisbec@...il.com>
Cc: Joerg Roedel <jroedel@...e.de>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Fixes: 6863ea0cda8 ("x86/mm: Remove in_nmi() warning from vmalloc_fault()")
Link: http://lkml.kernel.org/r/nycvar.YFH.7.76.1904240902280.9803@cbobk.fhfr.pm
Signed-off-by: Ingo Molnar <mingo@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 arch/x86/mm/fault.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/arch/x86/mm/fault.c b/arch/x86/mm/fault.c
index 47bebfe6efa70..9d9765e4d1ef1 100644
--- a/arch/x86/mm/fault.c
+++ b/arch/x86/mm/fault.c
@@ -427,8 +427,6 @@ static noinline int vmalloc_fault(unsigned long address)
 	if (!(address >= VMALLOC_START && address < VMALLOC_END))
 		return -1;
 
-	WARN_ON_ONCE(in_nmi());
-
 	/*
 	 * Copy kernel mappings over when needed. This can also
 	 * happen within a race in page table update. In the later
-- 
2.20.1