This is a note to let you know that I've just added the patch titled
MIPS: compressed: fix build with enabled UBSAN
to the 5.11-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
mips-compressed-fix-build-with-enabled-ubsan.patch
and it can be found in the queue-5.11 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From fc4cac4cfc437659ce445c3c47b807e1cc625b66 Mon Sep 17 00:00:00 2001
From: Alexander Lobakin <alobakin@xxxxx>
Date: Mon, 8 Feb 2021 12:37:42 +0000
Subject: MIPS: compressed: fix build with enabled UBSAN
From: Alexander Lobakin <alobakin@xxxxx>
commit fc4cac4cfc437659ce445c3c47b807e1cc625b66 upstream.
Commit 1e35918ad9d1 ("MIPS: Enable Undefined Behavior Sanitizer
UBSAN") added a possibility to build the entire kernel with UBSAN
instrumentation for MIPS, with the exception for VDSO.
However, self-extracting head wasn't been added to exceptions, so
this occurs:
mips-alpine-linux-musl-ld: arch/mips/boot/compressed/decompress.o:
in function `FSE_buildDTable_wksp':
decompress.c:(.text.FSE_buildDTable_wksp+0x278): undefined reference
to `__ubsan_handle_shift_out_of_bounds'
mips-alpine-linux-musl-ld: decompress.c:(.text.FSE_buildDTable_wksp+0x2a8):
undefined reference to `__ubsan_handle_shift_out_of_bounds'
mips-alpine-linux-musl-ld: decompress.c:(.text.FSE_buildDTable_wksp+0x2c4):
undefined reference to `__ubsan_handle_shift_out_of_bounds'
mips-alpine-linux-musl-ld: arch/mips/boot/compressed/decompress.o:
decompress.c:(.text.FSE_buildDTable_raw+0x9c): more undefined references
to `__ubsan_handle_shift_out_of_bounds' follow
Add UBSAN_SANITIZE := n to mips/boot/compressed/Makefile to exclude
it from instrumentation scope and fix this issue.
Fixes: 1e35918ad9d1 ("MIPS: Enable Undefined Behavior Sanitizer UBSAN")
Cc: stable@xxxxxxxxxxxxxxx # 5.0+
Signed-off-by: Alexander Lobakin <alobakin@xxxxx>
Signed-off-by: Thomas Bogendoerfer <tsbogend@xxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/mips/boot/compressed/Makefile | 1 +
1 file changed, 1 insertion(+)
--- a/arch/mips/boot/compressed/Makefile
+++ b/arch/mips/boot/compressed/Makefile
@@ -37,6 +37,7 @@ KBUILD_AFLAGS := $(KBUILD_AFLAGS) -D__AS
# Prevents link failures: __sanitizer_cov_trace_pc() is not linked in.
KCOV_INSTRUMENT := n
GCOV_PROFILE := n
+UBSAN_SANITIZE := n
# decompressor objects (linked with vmlinuz)
vmlinuzobjs-y := $(obj)/head.o $(obj)/decompress.o $(obj)/string.o
Patches currently in stable-queue which might be from alobakin@xxxxx are
queue-5.11/mips-vmlinux.lds.s-add-missing-page_aligned_data-section.patch
queue-5.11/mips-compressed-fix-build-with-enabled-ubsan.patch
queue-5.11/mips-properly-stop-.eh_frame-generation.patch
