From 7e61560628d17ea6b1d8ee370f6d42694cff8758 Mon Sep 17 00:00:00 2001 From: Ulises Mendez Martinez Date: Fri, 4 Sep 2026 15:07:09 +0000 Subject: objtool: Validate disassembler headers in libopcodes probe commit 3f2de814c059 ("objtool: Fix libopcodes linking with static libraries") tested for libopcodes availability by linking a test snippet with a forward declaration of disassemble_init_for_target(). However, testing symbol linkage with an extern declaration only verifies the presence of the library (.so/.a) and bypasses checking for development headers (binutils-dev). On systems where libopcodes is present without development headers installed, the probe succeeds, enabling BUILD_DISAS. Subsequent compilation of objtool then fails: fatal error: 'bfd.h' file not found 113 | #include Additionally, the probe invokes $(HOSTCC) without $(HOSTCFLAGS), ignoring any sysroot or include flags specified for the host compiler. Fix this by including and directly in the test snippet, passing $(HOSTCFLAGS) so host compiler options are respected, and defining PACKAGE="objtool" to satisfy the configuration check in . Fixes: 3f2de814c059 ("objtool: Fix libopcodes linking with static libraries") Fixes: 436326bc525d ("objtool: fix build failure due to missing libopcodes check") Reported-by: Alice Ryhl Assisted-by: Antigravity:Gemini-Next Signed-off-by: Ulises Mendez Martinez Link: https://patch.msgid.link/20260904150710.2997558-1-umendez@google.com Signed-off-by: Josh Poimboeuf --- scripts/mksysmap | 94 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 94 insertions(+) create mode 100755 scripts/mksysmap (limited to 'scripts/mksysmap') diff --git a/scripts/mksysmap b/scripts/mksysmap new file mode 100755 index 000000000..c4531eacd --- /dev/null +++ b/scripts/mksysmap @@ -0,0 +1,94 @@ +#!/bin/sed -f +# SPDX-License-Identifier: GPL-2.0-only +# +# sed script to filter out symbols that are not needed for System.map, +# or not suitable for kallsyms. The input should be 'nm -n '. +# +# System.map is used by module-init tools and some debugging +# tools to retrieve the actual addresses of symbols in the kernel. +# +# readprofile starts reading symbols when _stext is found, and +# continue until it finds a symbol which is not either of 'T', 't', +# 'W' or 'w'. +# +# --------------------------------------------------------------------------- +# Ignored symbol types +# + +# a: local absolute symbols +# N: debugging symbols +# U: undefined global symbols +# w: local weak symbols +/ [aNUw] /d + +# --------------------------------------------------------------------------- +# Ignored prefixes +# (do not forget a space before each pattern) + +# local symbols for ARM, MIPS, etc. +/ \$/d + +# local labels, .LBB, .Ltmpxxx, .L__unnamed_xx, .LASANPC, etc. +/ \.L/d + +# arm64 EFI stub namespace +/ __efistub_/d + +# arm64 local symbols in PIE namespace +/ __pi_\\$/d +/ __pi_\.L/d + +# arm64 local symbols in non-VHE KVM namespace +/ __kvm_nvhe_\$/d +/ __kvm_nvhe_\.L/d + +# lld arm/aarch64/mips thunks +/ __[[:alnum:]]*Thunk_/d + +# CFI type identifiers +/ __kcfi_typeid_/d +/ __kvm_nvhe___kcfi_typeid_/d +/ __pi___kcfi_typeid_/d + +# CRC from modversions +/ __crc_/d + +# EXPORT_SYMBOL (symbol name) +/ __kstrtab_/d + +# EXPORT_SYMBOL (namespace) +/ __kstrtabns_/d + +# MODULE_DEVICE_TABLE (symbol name) +/ __mod_device_table__/d + +# --------------------------------------------------------------------------- +# Ignored suffixes +# (do not forget '$' after each pattern) + +# arm +/_from_arm$/d +/_from_thumb$/d +/_veneer$/d + +# --------------------------------------------------------------------------- +# Ignored symbols (exact match) +# (do not forget a space before and '$' after each pattern) + +# for LoongArch? +/ L0$/d + +# ppc +/ _SDA_BASE_$/d +/ _SDA2_BASE_$/d + +# MODULE_INFO() +/ __UNIQUE_ID_modinfo[0-9]*$/d + +# --------------------------------------------------------------------------- +# Ignored patterns +# (symbols that contain the pattern are ignored) + +# ppc stub +/\.long_branch\./d +/\.plt_branch\./d -- cgit v1.3.1