linux-kernel - [PATCH -rc v1] gcov: Disable gcov build with GCC 10

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-next>] [day] [month] [year] [list]

Message-Id: <20200904155808.4997-1-leon@kernel.org>
Date:   Fri,  4 Sep 2020 18:58:08 +0300
From:   Leon Romanovsky <leon@...nel.org>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Leon Romanovsky <leonro@...dia.com>,
        Peter Oberparleiter <oberpar@...ux.ibm.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Colin Ian King <colin.king@...onical.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: [PATCH -rc v1] gcov: Disable gcov build with GCC 10

From: Leon Romanovsky <leonro@...dia.com>

GCOV built with GCC 10 doesn't initialize n_function variable.
This produces different kernel panics as was seen by Colin in
Ubuntu [1] and me in FC 32 [2].

As a workaround, let's disable GCOV build for broken GCC 10 version.

[1] https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1891288
[2] https://lore.kernel.org/lkml/20200827133932.3338519-1-leon@kernel.org
Cc: Colin Ian King <colin.king@...onical.com>
Signed-off-by: Leon Romanovsky <leonro@...dia.com>
---
 As was discussed:
 https://lore.kernel.org/lkml/CAHk-=whbijeSdSvx-Xcr0DPMj0BiwhJ+uiNnDSVZcr_h_kg7UA@mail.gmail.com/
---
 kernel/gcov/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/kernel/gcov/Kconfig b/kernel/gcov/Kconfig
index 3110c77230c7..bb4b680e8455 100644
--- a/kernel/gcov/Kconfig
+++ b/kernel/gcov/Kconfig
@@ -4,6 +4,7 @@ menu "GCOV-based kernel profiling"
 config GCOV_KERNEL
 	bool "Enable gcov-based kernel profiling"
 	depends on DEBUG_FS
+	depends on !CC_IS_GCC || GCC_VERSION < 100000
 	select CONSTRUCTORS if !UML
 	default n
 	help
--
2.26.2