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: <20210823171318.2801096-9-samitolvanen@google.com>
Date:   Mon, 23 Aug 2021 10:13:12 -0700
From:   Sami Tolvanen <samitolvanen@...gle.com>
To:     x86@...nel.org
Cc:     Kees Cook <keescook@...omium.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Sedat Dilek <sedat.dilek@...il.com>,
        linux-hardening@...r.kernel.org, linux-kernel@...r.kernel.org,
        clang-built-linux@...glegroups.com,
        Sami Tolvanen <samitolvanen@...gle.com>
Subject: [PATCH v2 08/14] x86/extable: Do not mark exception callback as CFI

From: Kees Cook <keescook@...omium.org>

The exception table entries are constructed out of a relative offset
and point to the actual function, not the CFI table entry. For now,
just mark the caller as not checking CFI. The failure is most visible
at boot with CONFIG_DEBUG_RODATA_TEST=y.

Signed-off-by: Kees Cook <keescook@...omium.org>
Signed-off-by: Sami Tolvanen <samitolvanen@...gle.com>
---
 arch/x86/mm/extable.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/x86/mm/extable.c b/arch/x86/mm/extable.c
index e1664e9f969c..d150d4d12d53 100644
--- a/arch/x86/mm/extable.c
+++ b/arch/x86/mm/extable.c
@@ -155,6 +155,7 @@ enum handler_type ex_get_fault_handler_type(unsigned long ip)
 		return EX_HANDLER_OTHER;
 }
 
+__nocfi
 int fixup_exception(struct pt_regs *regs, int trapnr, unsigned long error_code,
 		    unsigned long fault_addr)
 {
-- 
2.33.0.rc2.250.ged5fa647cd-goog

Powered by blists - more mailing lists

Powered by Openwall GNU/*/Linux Powered by OpenVZ