From: Alexey Dobriyan <adobriyan@gmail.com>
To: akpm@linux-foundation.org
Cc: linux-kernel@vger.kernel.org, linux-api@vger.kernel.org
Subject: [PATCH] ELF, uapi: fixup ELF_ST_TYPE definition
Date: Fri, 29 Apr 2022 17:50:03 +0300 [thread overview]
Message-ID: <Ymv7G1BeX4kt3obz@localhost.localdomain> (raw)
This is very theoretical compile failure:
ELF_ST_TYPE(st_info = A)
Cast will bind first and st_info will stop being lvalue:
error: lvalue required as left operand of assignment
Given that the only use of this macro is
ELF_ST_TYPE(sym->st_info)
where st_info is "unsigned char" I've decided to remove cast especially
given that companion macro ELF_ST_BIND doesn't use cast.
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
---
include/uapi/linux/elf.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/include/uapi/linux/elf.h
+++ b/include/uapi/linux/elf.h
@@ -134,7 +134,7 @@ typedef __s64 Elf64_Sxword;
#define STT_TLS 6
#define ELF_ST_BIND(x) ((x) >> 4)
-#define ELF_ST_TYPE(x) (((unsigned int) x) & 0xf)
+#define ELF_ST_TYPE(x) ((x) & 0xf)
#define ELF32_ST_BIND(x) ELF_ST_BIND(x)
#define ELF32_ST_TYPE(x) ELF_ST_TYPE(x)
#define ELF64_ST_BIND(x) ELF_ST_BIND(x)
next reply other threads:[~2022-04-29 14:50 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-04-29 14:50 Alexey Dobriyan [this message]
2022-04-29 17:25 ` [PATCH] ELF, uapi: fixup ELF_ST_TYPE definition Kees Cook
2022-04-29 18:02 ` Alexey Dobriyan
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=Ymv7G1BeX4kt3obz@localhost.localdomain \
--to=adobriyan@gmail.com \
--cc=akpm@linux-foundation.org \
--cc=linux-api@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).