torvalds/linux
3
0
Fork 0
mirror of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git synced 2026-04-16 03:09:12 +08:00
Code Issues Packages Projects Releases Wiki Activity

objtool: Add CONFIG_OBJTOOL

Browse Source 
Now that stack validation is an optional feature of objtool, add
CONFIG_OBJTOOL and replace most usages of CONFIG_STACK_VALIDATION with
it.

CONFIG_STACK_VALIDATION can now be considered to be frame-pointer
specific.  CONFIG_UNWINDER_ORC is already inherently valid for live
patching, so no need to "validate" it.

Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Miroslav Benes <mbenes@suse.cz>
Link: https://lkml.kernel.org/r/939bf3d85604b2a126412bf11af6e3bd3b872bcb.1650300597.git.jpoimboe@redhat.com
This commit is contained in:
Josh Poimboeuf
2022-04-18 09:50:36 -07:00
committed by Peter Zijlstra
parent c2bdd61c98
commit 03f16cd020
17 changed files with 73 additions and 57 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
scripts/Makefile.build
View File

@@ -222,7 +222,7 @@ cmd_record_mcount = $(if $(findstring $(strip $(CC_FLAGS_FTRACE)),$(_c_flags)),
$(sub_cmd_record_mcount))
endif # CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT
ifdef CONFIG_STACK_VALIDATION
ifdef CONFIG_OBJTOOL
objtool := $(objtree)/tools/objtool/objtool
@@ -241,7 +241,7 @@ objtool_args = \
cmd_objtool = $(if $(objtool-enabled), ; $(objtool) $(objtool_args) $@)
cmd_gen_objtooldep = $(if $(objtool-enabled), { echo ; echo '$@: $$(wildcard $(objtool))' ; } >> $(dot-target).cmd)
endif # CONFIG_STACK_VALIDATION
endif # CONFIG_OBJTOOL
ifneq ($(CONFIG_LTO_CLANG)$(CONFIG_X86_KERNEL_IBT),)

32
scripts/link-vmlinux.sh
View File

@@ -108,8 +108,11 @@ objtool_link()
local objtoolcmd;
local objtoolopt;
if is_enabled CONFIG_STACK_VALIDATION && \
( is_enabled CONFIG_LTO_CLANG || is_enabled CONFIG_X86_KERNEL_IBT ); then
if ! is_enabled CONFIG_OBJTOOL; then
return;
fi
if is_enabled CONFIG_LTO_CLANG || is_enabled CONFIG_X86_KERNEL_IBT; then
# Don't perform vmlinux validation unless explicitly requested,
# but run objtool on vmlinux.o now that we have an object file.
@@ -126,10 +129,23 @@ objtool_link()
objtoolopt="${objtoolopt} --orc"
fi
if is_enabled CONFIG_RETPOLINE; then
objtoolopt="${objtoolopt} --retpoline"
fi
if is_enabled CONFIG_SLS; then
objtoolopt="${objtoolopt} --sls"
fi
if is_enabled CONFIG_STACK_VALIDATION; then
objtoolopt="${objtoolopt} --stackval"
fi
if is_enabled CONFIG_X86_SMAP; then
objtoolopt="${objtoolopt} --uaccess"
fi
objtoolopt="${objtoolopt} --lto"
fi
@@ -139,18 +155,6 @@ objtool_link()
if [ -n "${objtoolopt}" ]; then
if is_enabled CONFIG_RETPOLINE; then
objtoolopt="${objtoolopt} --retpoline"
fi
if is_enabled CONFIG_SLS; then
objtoolopt="${objtoolopt} --sls"
fi
if is_enabled CONFIG_X86_SMAP; then
objtoolopt="${objtoolopt} --uaccess"
fi
if ! is_enabled CONFIG_FRAME_POINTER; then
objtoolopt="${objtoolopt} --no-fp"
fi

2
scripts/package/builddeb
View File

@@ -67,7 +67,7 @@ deploy_kernel_headers () {
) > debian/hdrsrcfiles
{
if is_enabled CONFIG_STACK_VALIDATION; then
if is_enabled CONFIG_OBJTOOL; then
echo tools/objtool/objtool
fi