linux-kernel - [PATCH v6 2/5] x86/mm: fix sme_populate

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:   Fri,  7 Sep 2018 12:57:27 -0500
From:   Brijesh Singh <brijesh.singh@....com>
To:     x86@...nel.org, linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Cc:     Brijesh Singh <brijesh.singh@....com>,
        Tom Lendacky <thomas.lendacky@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Borislav Petkov <bp@...e.de>, "H. Peter Anvin" <hpa@...or.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Sean Christopherson <sean.j.christopherson@...el.com>,
        Radim Krčmář <rkrcmar@...hat.com>
Subject: [PATCH v6 2/5] x86/mm: fix sme_populate_pgd() to update page flags

Fix sme_populate_pgd() to update page flags if the PMD/PTE entry
already exists.

Signed-off-by: Brijesh Singh <brijesh.singh@....com>
Reviewed-by: Tom Lendacky <thomas.lendacky@....com>
Cc: Tom Lendacky <thomas.lendacky@....com>
Cc: kvm@...r.kernel.org
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Borislav Petkov <bp@...e.de>
Cc: "H. Peter Anvin" <hpa@...or.com>
Cc: linux-kernel@...r.kernel.org
Cc: Paolo Bonzini <pbonzini@...hat.com>
Cc: Sean Christopherson <sean.j.christopherson@...el.com>
Cc: kvm@...r.kernel.org
Cc: "Radim Krčmář" <rkrcmar@...hat.com>
---
 arch/x86/mm/mem_encrypt_identity.c | 6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

diff --git a/arch/x86/mm/mem_encrypt_identity.c b/arch/x86/mm/mem_encrypt_identity.c
index 92265d3..7659e65 100644
--- a/arch/x86/mm/mem_encrypt_identity.c
+++ b/arch/x86/mm/mem_encrypt_identity.c
@@ -154,9 +154,6 @@ static void __init sme_populate_pgd_large(struct sme_populate_pgd_data *ppd)
 		return;
 
 	pmd = pmd_offset(pud, ppd->vaddr);
-	if (pmd_large(*pmd))
-		return;
-
 	set_pmd(pmd, __pmd(ppd->paddr | ppd->pmd_flags));
 }
 
@@ -182,8 +179,7 @@ static void __init sme_populate_pgd(struct sme_populate_pgd_data *ppd)
 		return;
 
 	pte = pte_offset_map(pmd, ppd->vaddr);
-	if (pte_none(*pte))
-		set_pte(pte, __pte(ppd->paddr | ppd->pte_flags));
+	set_pte(pte, __pte(ppd->paddr | ppd->pte_flags));
 }
 
 static void __init __sme_map_range_pmd(struct sme_populate_pgd_data *ppd)
-- 
2.7.4