On Sun, Jan 22, 2023 at 03:21:43PM +0100, Greg Kroah-Hartman wrote:
On Tue, Jan 17, 2023 at 05:50:06PM -0600, Tom Saeger wrote:
On Sat, Jan 14, 2023 at 02:53:52PM +0100, Greg Kroah-Hartman wrote:
On Fri, Jan 13, 2023 at 09:06:54AM -0600, Tom Saeger wrote:
On Thu, Jan 12, 2023 at 03:20:11PM -0600, Tom Saeger wrote:
On Thu, Jan 12, 2023 at 01:00:57PM +0100, Greg Kroah-Hartman wrote:
On Mon, Jan 09, 2023 at 12:36:15PM -0600, Tom Saeger wrote: > On Thu, Dec 22, 2022 at 07:01:11AM +0100, Greg Kroah-Hartman wrote: > > On Wed, Dec 21, 2022 at 02:52:10PM -0600, Tom Saeger wrote: > > > On Wed, Dec 21, 2022 at 05:31:51PM +0100, Greg Kroah-Hartman wrote: > > > > On Thu, Dec 15, 2022 at 04:18:18PM -0700, Tom Saeger wrote: > > > > > Backport of: > > > > > commit 0d362be5b142 ("Makefile: link with -z noexecstack --no-warn-rwx-segments") > > > > > breaks arm64 Build ID when CONFIG_MODVERSIONS=y for all kernels > > > > > from: commit e4484a495586 ("Merge tag 'kbuild-fixes-v5.0' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild") > > > > > until: commit df202b452fe6 ("Merge tag 'kbuild-v5.19' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild") > > > > > > > > > > Linus's tree doesn't have this issue since 0d362be5b142 was merged > > > > > after df202b452fe6 which included: > > > > > commit 7b4537199a4a ("kbuild: link symbol CRCs at final link, removing CONFIG_MODULE_REL_CRCS") > > > > > > > > Why can't we add this one instead of a custom change? > > > > > > I quickly abandoned that route - there are too many dependencies. > > > > How many? Why? Whenever we add a "this is not upstream" patch, 90% of > > the time it is incorrect and causes problems (merge issues included.) > > So please please please let's try to keep in sync with what is in > > Linus's tree. > > > > thanks, > > > > greg k-h > > Ok - I spent some time on this. > > The haystack I searched: > > git rev-list --grep="masahiroy/linux-kbuild" v5.15..v5.19-rc1 | while read -r CID ; do git rev-list "${CID}^-" ; done | wc -l > 182 > > I have 54 of those 182 applied to 5.15.85, and this works in my > limited build testing (x86_64 gcc, arm64 gcc, arm64 clang). > > Specifically: > > > cbfc9bf3223f genksyms: adjust the output format to modpost > e7c9c2630e59 kbuild: stop merging *.symversions > 1d788aa800c7 kbuild: link symbol CRCs at final link, removing CONFIG_MODULE_REL_CRCS > 8a01c770955b modpost: extract symbol versions from *.cmd files > a8ade6b33772 modpost: add sym_find_with_module() helper > a9639fe6b516 modpost: change the license of EXPORT_SYMBOL to bool type > 04804878f631 modpost: remove left-over cross_compile declaration > 3388b8af9698 kbuild: record symbol versions in *.cmd files > 4ff3946463a0 kbuild: generate a list of objects in vmlinux > 074617e2ad6a modpost: move *.mod.c generation to write_mod_c_files() > 81b78cb6e821 modpost: merge add_{intree_flag,retpoline,staging_flag} to add_header > 9df4f00b53b4 modpost: split new_symbol() to symbol allocation and hash table addition > 85728bcbc500 modpost: make sym_add_exported() always allocate a new symbol > 82aa2b4d30af modpost: make multiple export error > 6cc962f0a175 modpost: dump Module.symvers in the same order of modules.order > 39db82cea373 modpost: traverse the namespace_list in order > 45dc7b236dcb modpost: use doubly linked list for dump_lists > 2a322506403a modpost: traverse unresolved symbols in order > a85718443348 modpost: add sym_add_unresolved() helper > 5c44b0f89c82 modpost: traverse modules in order > a0b68f6655f2 modpost: import include/linux/list.h > ce9f4d32be4e modpost: change mod->gpl_compatible to bool type > f9fe36a515ca modpost: use bool type where appropriate > 46f6334d7055 modpost: move struct namespace_list to modpost.c > afa24c45af49 modpost: retrieve the module dependency and CRCs in check_exports() > a8f687dc3ac2 modpost: add a separate error for exported symbols without definition > f97f0e32b230 modpost: remove stale comment about sym_add_exported() > 0af2ad9d11c3 modpost: do not write out any file when error occurred > 09eac5681c02 modpost: use snprintf() instead of sprintf() for safety > ee07380110f2 kbuild: read *.mod to get objects passed to $(LD) or $(AR) > 97976e5c6d55 kbuild: make *.mod not depend on *.o > 0d4368c8da07 kbuild: get rid of duplication in *.mod files > 55f602f00903 kbuild: split the second line of *.mod into *.usyms > ea9730eb0788 kbuild: reuse real-search to simplify cmd_mod > 1eacf71f885a kbuild: make multi_depend work with targets in subdirectory > 19c2b5b6f769 kbuild: reuse suffix-search to refactor multi_depend > 75df07a9133d kbuild: refactor cmd_modversions_S > 53257fbea174 kbuild: refactor cmd_modversions_c > b6e50682c261 modpost: remove annoying namespace_from_kstrtabns() > 1002d8f060b0 modpost: remove redundant initializes for static variables > 921fbb7ab714 modpost: move export_from_secname() call to more relevant place > f49c0989e01b modpost: remove useless export_from_sec() > 7a98501a77db kbuild: do not remove empty *.symtypes explicitly > 500f1b31c16f kbuild: factor out genksyms command from cmd_gensymtypes_{c,S} > e04fcad29aa3 kallsyms: ignore all local labels prefixed by '.L' > 9e01f7ef15d2 kbuild: drop $(size_append) from cmd_zstd > 054133567480 kbuild: do not include include/config/auto.conf from shell scripts > 34d14831eecb kbuild: stop using config_filename in scripts/Makefile.modsign > 75155bda5498 kbuild: use more subdir- for visiting subdirectories while cleaning > 1a3f00cd3be8 kbuild: reuse $(cmd_objtool) for cmd_cc_lto_link_modules > 47704d10e997 kbuild: detect objtool update without using .SECONDEXPANSION > 7a89d034ccc6 kbuild: factor out OBJECT_FILES_NON_STANDARD check into a macro > 3cbbf4b9d188 kbuild: store the objtool command in *.cmd files > 467f0d0aa6b4 kbuild: rename __objtool_obj and reuse it for cmd_cc_lto_link_modules > > There may be a few more patches post v5.19-rc1 for Fixes. > I haven't tried minimizing the 54. > > Greg - is 54 too many?
Yes.
How about we just revert the original problem commit here to solve this mess? Wouldn't that be easier overall?
thanks,
greg k-h
What about a partial revert like:
diff --git a/Makefile b/Makefile index 9f5d2e87150e..aa0f7578653d 100644 --- a/Makefile +++ b/Makefile @@ -1083,7 +1083,9 @@ KBUILD_CFLAGS += $(KCFLAGS) KBUILD_LDFLAGS_MODULE += --build-id=sha1 LDFLAGS_vmlinux += --build-id=sha1
+ifneq ($(ARCH),$(filter $(ARCH),arm64)) KBUILD_LDFLAGS += -z noexecstack +endif ifeq ($(CONFIG_LD_IS_BFD),y) KBUILD_LDFLAGS += $(call ld-option,--no-warn-rwx-segments) endif
Only arm64 gcc/ld builds would need to change (with the option of adding other architectures if anyone reports same issue).
With a full revert we lose --no-warn-rwx-segments and warnings show-up with later versions of ld.
I did open a bug against 'ld' as Nick requested: https://sourceware.org/bugzilla/show_bug.cgi?id=29994
If this is this is a better way to go - I can form up a v3 patch.
--Tom
nevermind
The patch discussed here fixes arm64 Build ID for 5.15, 5.10, and 5.4:
https://lore.kernel.org/all/CAMj1kXHqQoqoys83nEp=Q6oT68+-GpCuMjfnYK9pMy-X_+j...
Great, please let me know when this hits Linus's tree and I will be glad to queue it up.
thanks,
greg k-h
Hi Greg,
Masahiroy's commit is already in Linus's tree.
❯ git log -n1 --format=oneline 99cb0d917ffa 99cb0d917ffa1ab628bb67364ca9b162c07699b1 arch: fix broken BuildID for arm64 and riscv
❯ git tag --contains=99cb0d917ffa v6.2-rc2 v6.2-rc3 v6.2-rc4
Needed to fix Build ID in 5.15, 5.10, and 5.4
Build results on arm64: PASS v4.19.269 c652c812211c ("Linux 4.19.269") Build ID: 3b638c635fb3f3241b3e7ad6a147cf69d931b5b7 PASS v4.19.269 00527d2a4998 ("arch: fix broken BuildID for arm64 and riscv") Build ID: 919b5ca1964776926bc6c8addc5b8af4fb15367b FAIL v5.4.228 851c2b5fb793 ("Linux 5.4.228") PASS v5.4.228 39bb8287bc08 ("arch: fix broken BuildID for arm64 and riscv") Build ID: 483ac60fe71545045e625e681f3d4ebae5d15cd1 FAIL v5.10.163 19ff2d645f7a ("Linux 5.10.163") PASS v5.10.163 6136c3a732cf ("arch: fix broken BuildID for arm64 and riscv") Build ID: 4c0926311f96a031c0581d8136d09ca4f7ca77b6 FAIL v5.15.88 90bb4f8f399f ("Linux 5.15.88") PASS v5.15.88 6cb364966c77 ("arch: fix broken BuildID for arm64 and riscv") Build ID: 623dab2f6bd78271e315493c232abf042af88036 PASS v6.1.6 38f3ee12661f ("Linux 6.1.6") Build ID: 8b9e3e330b093ab6037a5dcffcaefca84a878d44 PASS v6.1.6 db1031af82be ("arch: fix broken BuildID for arm64 and riscv") Build ID: 2d848c31fcc31414513fa33ff2990fe6c9afa88c
Now queued up everywhere, thanks!
Ick, there was lots of fix-up patches for this commit, please always be aware of that when recommending a patch be backported...
thanks,
greg k-h