It will used by bpf to reject attaching fexit prog to functions annotated with __noreturn. Signed-off-by: Yafang Shao <laoar.shao@xxxxxxxxx> --- include/linux/noreturns.h | 52 +++++++++++++++++++++++++ tools/objtool/Documentation/objtool.txt | 3 +- tools/objtool/sync-check.sh | 2 + 3 files changed, 56 insertions(+), 1 deletion(-) create mode 100644 include/linux/noreturns.h diff --git a/include/linux/noreturns.h b/include/linux/noreturns.h new file mode 100644 index 000000000000..b2174894f9f7 --- /dev/null +++ b/include/linux/noreturns.h @@ -0,0 +1,52 @@ +/* SPDX-License-Identifier: GPL-2.0 */ + +/* + * This is a (sorted!) list of all known __noreturn functions in the kernel. + * It's needed for objtool to properly reverse-engineer the control flow graph. + * + * Yes, this is unfortunate. A better solution is in the works. + */ +NORETURN(__fortify_panic) +NORETURN(__ia32_sys_exit) +NORETURN(__ia32_sys_exit_group) +NORETURN(__kunit_abort) +NORETURN(__module_put_and_kthread_exit) +NORETURN(__stack_chk_fail) +NORETURN(__tdx_hypercall_failed) +NORETURN(__ubsan_handle_builtin_unreachable) +NORETURN(__x64_sys_exit) +NORETURN(__x64_sys_exit_group) +NORETURN(arch_cpu_idle_dead) +NORETURN(bch2_trans_in_restart_error) +NORETURN(bch2_trans_restart_error) +NORETURN(bch2_trans_unlocked_error) +NORETURN(cpu_bringup_and_idle) +NORETURN(cpu_startup_entry) +NORETURN(do_exit) +NORETURN(do_group_exit) +NORETURN(do_task_dead) +NORETURN(ex_handler_msr_mce) +NORETURN(hlt_play_dead) +NORETURN(hv_ghcb_terminate) +NORETURN(kthread_complete_and_exit) +NORETURN(kthread_exit) +NORETURN(kunit_try_catch_throw) +NORETURN(machine_real_restart) +NORETURN(make_task_dead) +NORETURN(mpt_halt_firmware) +NORETURN(nmi_panic_self_stop) +NORETURN(panic) +NORETURN(panic_smp_self_stop) +NORETURN(rest_init) +NORETURN(rewind_stack_and_make_dead) +NORETURN(rust_begin_unwind) +NORETURN(rust_helper_BUG) +NORETURN(sev_es_terminate) +NORETURN(snp_abort) +NORETURN(start_kernel) +NORETURN(stop_this_cpu) +NORETURN(usercopy_abort) +NORETURN(x86_64_start_kernel) +NORETURN(x86_64_start_reservations) +NORETURN(xen_cpu_bringup_again) +NORETURN(xen_start_kernel) diff --git a/tools/objtool/Documentation/objtool.txt b/tools/objtool/Documentation/objtool.txt index 7c3ee959b63c..70a878e4dc36 100644 --- a/tools/objtool/Documentation/objtool.txt +++ b/tools/objtool/Documentation/objtool.txt @@ -326,7 +326,8 @@ the objtool maintainers. The call from foo() to bar() doesn't return, but bar() is missing the __noreturn annotation. NOTE: In addition to annotating the function - with __noreturn, please also add it to tools/objtool/noreturns.h. + with __noreturn, please also add it to tools/objtool/noreturns.h and + include/linux/noreturns.h. 4. file.o: warning: objtool: func(): can't find starting instruction or diff --git a/tools/objtool/sync-check.sh b/tools/objtool/sync-check.sh index 81d120d05442..23b9813cd5e9 100755 --- a/tools/objtool/sync-check.sh +++ b/tools/objtool/sync-check.sh @@ -17,6 +17,7 @@ arch/x86/include/asm/emulate_prefix.h arch/x86/lib/x86-opcode-map.txt arch/x86/tools/gen-insn-attr-x86.awk include/linux/static_call_types.h +tools/objtool/noreturns.h " SYNC_CHECK_FILES=' @@ -24,6 +25,7 @@ arch/x86/include/asm/inat.h arch/x86/include/asm/insn.h arch/x86/lib/inat.c arch/x86/lib/insn.c +include/linux/noreturns.h ' fi -- 2.43.5