From: Kees Cook <keescook@chromium.org>
To: Nicolas Pitre <nico@fluxnic.net>
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>,
Nick Desaulniers <ndesaulniers@google.com>,
Russell King - ARM Linux <linux@armlinux.org.uk>,
linux-kernel@vger.kernel.org,
clang-built-linux <clang-built-linux@googlegroups.com>,
Manoj Gupta <manojgupta@google.com>,
Nathan Chancellor <natechancellor@gmail.com>,
Linux ARM <linux-arm-kernel@lists.infradead.org>
Subject: [PATCH] ARM: rename missed uaccess .fixup section
Date: Fri, 7 Feb 2020 18:02:51 -0800 [thread overview]
Message-ID: <202002071754.F5F073F1D@keescook> (raw)
When the uaccess .fixup section was renamed to .text.fixup, one case was
missed. Under ld.bfd, the orphaned section was moved close to .text
(since they share the "ax" bits), so things would work normally on
uaccess faults. Under ld.lld, the orphaned section was placed outside
the .text section, making it unreachable. Rename the missed section.
Link: https://github.com/ClangBuiltLinux/linux/issues/282
Link: https://bugs.chromium.org/p/chromium/issues/detail?id=1020633#c44
Link: https://lore.kernel.org/r/nycvar.YSQ.7.76.1912032147340.17114@knanqh.ubzr
Fixes: c4a84ae39b4a5 ("ARM: 8322/1: keep .text and .fixup regions closer together")
Cc: stable@vger.kernel.org
Reported-by: Nathan Chancellor <natechancellor@gmail.com>
Reported-by: Manoj Gupta <manojgupta@google.com>
Debugged-by: Nick Desaulniers <ndesaulniers@google.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
---
I completely missed this the first several times I looked at this
problem. Thank you Nicolas for pushing back on the earlier patch!
Manoj or Nathan, can you test this?
---
arch/arm/lib/copy_from_user.S | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/arm/lib/copy_from_user.S b/arch/arm/lib/copy_from_user.S
index 95b2e1ce559c..f8016e3db65d 100644
--- a/arch/arm/lib/copy_from_user.S
+++ b/arch/arm/lib/copy_from_user.S
@@ -118,7 +118,7 @@ ENTRY(arm_copy_from_user)
ENDPROC(arm_copy_from_user)
- .pushsection .fixup,"ax"
+ .pushsection .text.fixup,"ax"
.align 0
copy_abort_preamble
ldmfd sp!, {r1, r2, r3}
--
2.20.1
--
Kees Cook
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next reply other threads:[~2020-02-08 2:03 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-08 2:02 Kees Cook [this message]
2020-02-08 7:18 ` [PATCH] ARM: rename missed uaccess .fixup section Nick Desaulniers
2020-02-08 7:54 ` Ard Biesheuvel
2020-02-08 8:55 ` Kees Cook
2020-02-08 10:04 ` Nick Desaulniers
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