linux-kernel - [PATCH 1/2] asm-generic: export: Stub EXPORT_SYMBOL with __DISABLE

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 for Android: free password hash cracker in your pocket

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

Message-Id: <20210203141931.615898-2-qperret@google.com>
Date:   Wed,  3 Feb 2021 14:19:30 +0000
From:   Quentin Perret <qperret@...gle.com>
To:     arnd@...db.de, maz@...nel.org, catalin.marinas@....com,
        will@...nel.org
Cc:     james.morse@....com, julien.thierry.kdev@...il.com,
        suzuki.poulose@....com, ardb@...nel.org,
        linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.cs.columbia.edu,
        kernel-team@...roid.com, qperret@...gle.com
Subject: [PATCH 1/2] asm-generic: export: Stub EXPORT_SYMBOL with __DISABLE_EXPORTS

It is currently possible to stub EXPORT_SYMBOL() macros in C code using
__DISABLE_EXPORTS, which is necessary to run in constrained environments
such as the EFI stub or the decompressor. But this currently doesn't
apply to exports from assembly, which can lead to somewhat confusing
situations.

Consolidate the __DISABLE_EXPORTS infrastructure by checking it from
asm-generic/export.h as well.

Signed-off-by: Quentin Perret <qperret@...gle.com>
---
 include/asm-generic/export.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/asm-generic/export.h b/include/asm-generic/export.h
index 365345f9a9e3..07a36a874dca 100644
--- a/include/asm-generic/export.h
+++ b/include/asm-generic/export.h
@@ -33,7 +33,7 @@
  */
 
 .macro ___EXPORT_SYMBOL name,val,sec
-#ifdef CONFIG_MODULES
+#if defined(CONFIG_MODULES) && !defined(__DISABLE_EXPORTS)
 	.section ___ksymtab\sec+\name,"a"
 	.balign KSYM_ALIGN
 __ksymtab_\name:
-- 
2.30.0.365.g02bc693789-goog