linux-kernel - [PATCH 2/2] x86/mm/64: Add vsyscall page to /proc/kcore conditionally

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: <1518446694-21124-3-git-send-email-zhang.jia@linux.alibaba.com>
Date:   Mon, 12 Feb 2018 22:44:54 +0800
From:   Jia Zhang <zhang.jia@...ux.alibaba.com>
To:     tglx@...utronix.de, jolsa@...hat.com, mingo@...hat.com,
        hpa@...or.com
Cc:     x86@...nel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 2/2] x86/mm/64: Add vsyscall page to /proc/kcore conditionally

The vsyscall page should be visible only if
vsyscall=emulate/native when dumping /proc/kcore.

Signed-off-by: Jia Zhang <zhang.jia@...ux.alibaba.com>
Reviewed-by: Jiri Olsa <jolsa@...nel.org>
---
 arch/x86/mm/init_64.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
index 14cd7f8..cbd6ea4 100644
--- a/arch/x86/mm/init_64.c
+++ b/arch/x86/mm/init_64.c
@@ -1193,8 +1193,10 @@ void __init mem_init(void)
 	register_page_bootmem_info();
 
 	/* Register memory areas for /proc/kcore */
-	kclist_add(&kcore_vsyscall, (void *)VSYSCALL_ADDR,
-		   PAGE_SIZE, KCORE_USER);
+	if (get_gate_vma(&init_mm)) {
+		kclist_add(&kcore_vsyscall, (void *)VSYSCALL_ADDR,
+			   PAGE_SIZE, KCORE_USER);
+	}
 
 	mem_init_print_info(NULL);
 }
-- 
1.8.3.1