linux-kernel - [PATCH 1/3] objtool: Write .orc

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Fri,  7 Aug 2020 12:18:00 +0800
From:   Huaixin Chang <changhuaixin@...ux.alibaba.com>
To:     changhuaixin@...ux.alibaba.com
Cc:     bp@...en8.de, hpa@...or.com, jpoimboe@...hat.com,
        linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org,
        luto@...capital.net, michal.lkml@...kovi.net, mingo@...hat.com,
        peterz@...radead.org, tglx@...utronix.de, x86@...nel.org,
        yamada.masahiro@...ionext.com
Subject: [PATCH 1/3] objtool: Write .orc_lookup section header

The purpose of this patch is to set sh_type to SHT_PROGBITS and remove
write bits away from sh_flags. In order to write section header, just
call elf_create_section() upon section orc_lookup with 0 entry written.

Originally, section headers are as follows:

  [23] .orc_unwind_ip    PROGBITS         ffffffff8259f4b8  0179f4b8
       0000000000178bbc  0000000000000000   A       0     0     1
  [24] .rela.orc_unwind_ RELA             0000000000000000  11e57b58
       00000000008d4668  0000000000000018   I      70    23     8
  [25] .orc_unwind       PROGBITS         ffffffff82718074  01918074
       000000000023519a  0000000000000000   A       0     0     1
  [26] .orc_lookup       NOBITS           ffffffff8294d210  01b4d20e
       0000000000030038  0000000000000000  WA       0     0     1
  [27] .vvar             PROGBITS         ffffffff8297e000  01b7e000
       0000000000001000  0000000000000000  WA       0     0     16

Now, they are changed to:

  [23] .orc_unwind_ip    PROGBITS         ffffffff8259f4b8  0179f4b8
       0000000000178bbc  0000000000000000   A       0     0     1
  [24] .rela.orc_unwind_ RELA             0000000000000000  11e57b58
       00000000008d4668  0000000000000018   I      70    23     8
  [25] .orc_unwind       PROGBITS         ffffffff82718074  01918074
       000000000023519a  0000000000000000   A       0     0     1
  [26] .orc_lookup       PROGBITS         ffffffff8294d210  01b4d210
       0000000000030038  0000000000000000   A       0     0     1
  [27] .vvar             PROGBITS         ffffffff8297e000  01b7e000
       0000000000001000  0000000000000000  WA       0     0     16

Signed-off-by: Huaixin Chang <changhuaixin@...ux.alibaba.com>
---
 tools/objtool/orc_gen.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/tools/objtool/orc_gen.c b/tools/objtool/orc_gen.c
index 968f55e6dd94..2b2653979ad6 100644
--- a/tools/objtool/orc_gen.c
+++ b/tools/objtool/orc_gen.c
@@ -189,6 +189,10 @@ int create_orc_sections(struct objtool_file *file)
 	u_sec = elf_create_section(file->elf, ".orc_unwind",
 				   sizeof(struct orc_entry), idx);
 
+	/* make flags of section orc_lookup right */
+	if (!elf_create_section(file->elf, ".orc_lookup", sizeof(int), 0))
+		return -1;
+
 	/* populate sections */
 	idx = 0;
 	for_each_sec(file, sec) {
-- 
2.14.4.44.g2045bb6