kernel/linux.git/tools/objtool, branch v6.6.132

objtool: Handle Clang RSP musical chairs

2026-04-02T11:07:15+00:00

[ Upstream commit 7fdaa640c810cb42090a182c33f905bcc47a616a ] For no apparent reason (possibly related to CONFIG_KMSAN), Clang can randomly pass the value of RSP to other registers and then back again to RSP. Handle that accordingly. Fixes the following warnings: drivers/input/misc/uinput.o: warning: objtool: uinput_str_to_user+0x165: undefined stack state drivers/input/misc/uinput.o: warning: objtool: uinput_str_to_user+0x165: unknown CFA base reg -1 Reported-by: Arnd Bergmann Closes: https://lore.kernel.org/90956545-2066-46e3-b547-10c884582eb0@app.fastmail.com Link: https://patch.msgid.link/240e6a172cc73292499334a3724d02ccb3247fc7.1772818491.git.jpoimboe@kernel.org Signed-off-by: Josh Poimboeuf Signed-off-by: Sasha Levin

kbuild: Leave objtool binary around with 'make clean'

2026-03-25T10:05:56+00:00

[ Upstream commit fdb12c8a24a453bdd6759979b6ef1e04ebd4beb4 ] The difference between 'make clean' and 'make mrproper' is documented in 'make help' as: clean - Remove most generated files but keep the config and enough build support to build external modules mrproper - Remove all generated files + config + various backup files After commit 68b4fe32d737 ("kbuild: Add objtool to top-level clean target"), running 'make clean' then attempting to build an external module with the resulting build directory fails with $ make ARCH=x86_64 O=build clean $ make -C build M=... MO=... ... /bin/sh: line 1: .../build/tools/objtool/objtool: No such file or directory as 'make clean' removes the objtool binary. Split the objtool clean target into mrproper and clean like Kbuild does and remove all generated artifacts with 'make clean' except for the objtool binary, which is removed with 'make mrproper'. To avoid a small race when running the objtool clean target through both objtool_mrproper and objtool_clean when running 'make mrproper', modify objtool's clean up find command to avoid using find's '-delete' command by piping the files into 'xargs rm -f' like the rest of Kbuild does. Cc: stable@vger.kernel.org Fixes: 68b4fe32d737 ("kbuild: Add objtool to top-level clean target") Reported-by: Michal Suchanek Closes: https://lore.kernel.org/20260225112633.6123-1-msuchanek@suse.de/ Reported-by: Rainer Fiebig Closes: https://lore.kernel.org/62d12399-76e5-3d40-126a-7490b4795b17@mailbox.org/ Acked-by: Josh Poimboeuf Acked-by: Peter Zijlstra (Intel) Reviewed-by: Nicolas Schier Tested-by: Nicolas Schier Link: https://patch.msgid.link/20260227-avoid-objtool-binary-removal-clean-v1-1-122f3e55eae9@kernel.org Signed-off-by: Nathan Chancellor [ Context ] Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman

kbuild: Add objtool to top-level clean target

2026-03-04T12:20:16+00:00

[ Upstream commit 68b4fe32d73789dea23e356f468de67c8367ef8f ] Objtool is an integral part of the build, make sure it gets cleaned by "make clean" and "make mrproper". Fixes: 442f04c34a1a ("objtool: Add tool to perform compile-time stack metadata validation") Reported-by: Jens Remus Closes: https://lore.kernel.org/15f2af3b-be33-46fc-b972-6b8e7e0aa52e@linux.ibm.com Signed-off-by: Josh Poimboeuf Tested-by: Jens Remus Link: https://patch.msgid.link/968faf2ed30fa8b3519f79f01a1ecfe7929553e5.1770759919.git.jpoimboe@kernel.org [nathan: use Closes: instead of Link: per checkpatch.pl] Signed-off-by: Nathan Chancellor Signed-off-by: Sasha Levin

objtool: Fix weak symbol detection

2026-01-11T14:21:13+00:00

[ Upstream commit 72567c630d32bc31f671977f78228c80937ed80e ] find_symbol_hole_containing() fails to find a symbol hole (aka stripped weak symbol) if its section has no symbols before the hole. This breaks weak symbol detection if -ffunction-sections is enabled. Fix that by allowing the interval tree to contain section symbols, which are always at offset zero for a given section. Fixes a bunch of (-ffunction-sections) warnings like: vmlinux.o: warning: objtool: .text.__x64_sys_io_setup+0x10: unreachable instruction Fixes: 4adb23686795 ("objtool: Ignore extra-symbol code") Acked-by: Petr Mladek Tested-by: Joe Lawrence Signed-off-by: Josh Poimboeuf Signed-off-by: Sasha Levin

objtool: Fix standalone --hacks=jump_label

2026-01-11T14:21:13+00:00

[ Upstream commit be8374a5ba7cbab6b97df94b4ffe0b92f5c8a6d2 ] The objtool command line 'objtool --hacks=jump_label foo.o' on its own should be expected to rewrite jump labels to NOPs. This means the add_special_section_alts() code path needs to run when only this option is provided. This is mainly relevant in certain debugging situations, but could potentially also fix kernel builds in which objtool is run with --hacks=jump_label but without --orc, --stackval, --uaccess, or --hacks=noinstr. Fixes: de6fbcedf5ab ("objtool: Read special sections with alts only when specific options are selected") Signed-off-by: Dylan Hatch Signed-off-by: Josh Poimboeuf Signed-off-by: Sasha Levin

objtool: Fix error handling inconsistencies in check()

2025-06-04T12:41:58+00:00

[ Upstream commit b745962cb97569aad026806bb0740663cf813147 ] Make sure all fatal errors are funneled through the 'out' label with a negative ret. Signed-off-by: Josh Poimboeuf Signed-off-by: Peter Zijlstra (Intel) Reviewed-by: Brendan Jackman Link: https://lore.kernel.org/r/0f49d6a27a080b4012e84e6df1e23097f44cc082.1741975349.git.jpoimboe@kernel.org Signed-off-by: Sasha Levin

objtool: Properly disable uaccess validation

2025-06-04T12:41:55+00:00

[ Upstream commit e1a9dda74dbffbc3fa2069ff418a1876dc99fb14 ] If opts.uaccess isn't set, the uaccess validation is disabled, but only partially: it doesn't read the uaccess_safe_builtin list but still tries to do the validation. Disable it completely to prevent false warnings. Signed-off-by: Josh Poimboeuf Signed-off-by: Ingo Molnar Cc: Linus Torvalds Link: https://lore.kernel.org/r/0e95581c1d2107fb5f59418edf2b26bba38b0cbb.1742852846.git.jpoimboe@kernel.org Signed-off-by: Sasha Levin

objtool: Ignore end-of-section jumps for KCOV/GCOV

2025-05-02T05:51:04+00:00

commit 0d7597749f5a3ac67851d3836635d084df15fb66 upstream. When KCOV or GCOV is enabled, dead code can be left behind, in which case objtool silences unreachable and undefined behavior (fallthrough) warnings. Fallthrough warnings, and their variant "end of section" warnings, were silenced with the following commit: 6b023c784204 ("objtool: Silence more KCOV warnings") Another variant of a fallthrough warning is a jump to the end of a function. If that function happens to be at the end of a section, the jump destination doesn't actually exist. Normally that would be a fatal objtool error, but for KCOV/GCOV it's just another undefined behavior fallthrough. Silence it like the others. Fixes the following warning: drivers/iommu/dma-iommu.o: warning: objtool: iommu_dma_sw_msi+0x92: can't find jump dest instruction at .text+0x54d5 Fixes: 6b023c784204 ("objtool: Silence more KCOV warnings") Reported-by: Randy Dunlap Signed-off-by: Josh Poimboeuf Signed-off-by: Ingo Molnar Cc: Linus Torvalds Link: https://lore.kernel.org/r/08fbe7d7e1e20612206f1df253077b94f178d93e.1743481539.git.jpoimboe@kernel.org Closes: https://lore.kernel.org/314f8809-cd59-479b-97d7-49356bf1c8d1@infradead.org/ Signed-off-by: Greg Kroah-Hartman

objtool: Stop UNRET validation on UD2

2025-05-02T05:50:59+00:00

[ Upstream commit 9f9cc012c2cbac4833746a0182e06a8eec940d19 ] In preparation for simplifying INSN_SYSCALL, make validate_unret() terminate control flow on UD2 just like validate_branch() already does. Signed-off-by: Josh Poimboeuf Signed-off-by: Ingo Molnar Cc: Linus Torvalds Link: https://lore.kernel.org/r/ce841269e7e28c8b7f32064464a9821034d724ff.1744095216.git.jpoimboe@kernel.org Signed-off-by: Sasha Levin

objtool, panic: Disable SMAP in __stack_chk_fail()

2025-05-02T05:50:55+00:00

[ Upstream commit 72c774aa9d1e16bfd247096935e7dae194d84929 ] __stack_chk_fail() can be called from uaccess-enabled code. Make sure uaccess gets disabled before calling panic(). Fixes the following warning: kernel/trace/trace_branch.o: error: objtool: ftrace_likely_update+0x1ea: call to __stack_chk_fail() with UACCESS enabled Signed-off-by: Josh Poimboeuf Signed-off-by: Ingo Molnar Cc: Kees Cook Cc: Andrew Morton Cc: Linus Torvalds Link: https://lore.kernel.org/r/a3e97e0119e1b04c725a8aa05f7bc83d98e657eb.1742852847.git.jpoimboe@kernel.org Signed-off-by: Sasha Levin