linux-kernel - [tip: objtool/urgent] objtool: Mark __ubsan_handle_builtin

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Message-ID: <165390713152.4207.14750134351387268996.tip-bot2@tip-bot2>
Date:   Mon, 30 May 2022 10:38:51 -0000
From:   "tip-bot2 for Peter Zijlstra" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     kernel test robot <lkp@...el.com>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [tip: objtool/urgent] objtool: Mark
 __ubsan_handle_builtin_unreachable() as noreturn

The following commit has been merged into the objtool/urgent branch of tip:

Commit-ID:     385bd430c011a8cb8278e61c32d602d11e06f414
Gitweb:        https://git.kernel.org/tip/385bd430c011a8cb8278e61c32d602d11e06f414
Author:        Peter Zijlstra <peterz@...radead.org>
AuthorDate:    Mon, 02 May 2022 11:15:14 +02:00
Committer:     Peter Zijlstra <peterz@...radead.org>
CommitterDate: Fri, 27 May 2022 12:34:43 +02:00

objtool: Mark __ubsan_handle_builtin_unreachable() as noreturn

  fs/ntfs3/ntfs3.prelink.o: warning: objtool: ni_read_frame() falls through to next function ni_readpage_cmpr.cold()

That is in fact:

000000000000124a <ni_read_frame.cold>:
    124a:       44 89 e0                mov    %r12d,%eax
    124d:       0f b6 55 98             movzbl -0x68(%rbp),%edx
    1251:       48 c7 c7 00 00 00 00    mov    $0x0,%rdi        1254: R_X86_64_32S      .data+0x1380
    1258:       48 89 c6                mov    %rax,%rsi
    125b:       e8 00 00 00 00          call   1260 <ni_read_frame.cold+0x16>   125c: R_X86_64_PLT32    __ubsan_handle_shift_out_of_bounds-0x4
    1260:       48 8d 7d cc             lea    -0x34(%rbp),%rdi
    1264:       e8 00 00 00 00          call   1269 <ni_read_frame.cold+0x1f>   1265: R_X86_64_PLT32    __tsan_read4-0x4
    1269:       8b 45 cc                mov    -0x34(%rbp),%eax
    126c:       e9 00 00 00 00          jmp    1271 <ni_read_frame.cold+0x27>   126d: R_X86_64_PC32     .text+0x19109
    1271:       48 8b 75 a0             mov    -0x60(%rbp),%rsi
    1275:       48 63 d0                movslq %eax,%rdx
    1278:       48 c7 c7 00 00 00 00    mov    $0x0,%rdi        127b: R_X86_64_32S      .data+0x13a0
    127f:       89 45 88                mov    %eax,-0x78(%rbp)
    1282:       e8 00 00 00 00          call   1287 <ni_read_frame.cold+0x3d>   1283: R_X86_64_PLT32    __ubsan_handle_shift_out_of_bounds-0x4
    1287:       8b 45 88                mov    -0x78(%rbp),%eax
    128a:       e9 00 00 00 00          jmp    128f <ni_read_frame.cold+0x45>   128b: R_X86_64_PC32     .text+0x19098
    128f:       48 c7 c7 00 00 00 00    mov    $0x0,%rdi        1292: R_X86_64_32S      .data+0x11f0
    1296:       e8 00 00 00 00          call   129b <ni_readpage_cmpr.cold>     1297: R_X86_64_PLT32    __ubsan_handle_builtin_unreachable-0x4

000000000000129b <ni_readpage_cmpr.cold>:

Tell objtool that __ubsan_handle_builtin_unreachable() is a noreturn.

Reported-by: kernel test robot <lkp@...el.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Link: https://lkml.kernel.org/r/20220502091514.GB479834@worktop.programming.kicks-ass.net
---
 tools/objtool/check.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/tools/objtool/check.c b/tools/objtool/check.c
index 190b2f6..7a187da 100644
--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -185,7 +185,8 @@ static bool __dead_end_function(struct objtool_file *file, struct symbol *func,
 		"do_group_exit",
 		"stop_this_cpu",
 		"__invalid_creds",
-               "cpu_startup_entry",
+		"cpu_startup_entry",
+		"__ubsan_handle_builtin_unreachable",
 	};
 
 	if (!func)