linux-kernel - [tip: x86/vdso] x86/vdso: Use proper modifier for len's format specifier in extract()

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Date:   Sat, 06 Mar 2021 10:38:19 -0000
From:   "tip-bot2 for Jiri Slaby" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Jiri Slaby <jslaby@...e.cz>, Borislav Petkov <bp@...e.de>,
        Jarkko Sakkinen <jarkko@...nel.org>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [tip: x86/vdso] x86/vdso: Use proper modifier for len's format
 specifier in extract()

The following commit has been merged into the x86/vdso branch of tip:

Commit-ID:     70c9d959226b7c5c48c119e2c1cfc1424f87b023
Gitweb:        https://git.kernel.org/tip/70c9d959226b7c5c48c119e2c1cfc1424f87b023
Author:        Jiri Slaby <jslaby@...e.cz>
AuthorDate:    Wed, 03 Mar 2021 07:43:57 +01:00
Committer:     Borislav Petkov <bp@...e.de>
CommitterDate: Sat, 06 Mar 2021 11:34:07 +01:00

x86/vdso: Use proper modifier for len's format specifier in extract()

Commit

  8382c668ce4f ("x86/vdso: Add support for exception fixup in vDSO functions")

prints length "len" which is size_t.

Compilers now complain when building on a 32-bit host:

  HOSTCC  arch/x86/entry/vdso/vdso2c
  ...
  In file included from arch/x86/entry/vdso/vdso2c.c:162:
  arch/x86/entry/vdso/vdso2c.h: In function 'extract64':
  arch/x86/entry/vdso/vdso2c.h:38:52: warning: format '%lu' expects argument of \
	type 'long unsigned int', but argument 4 has type 'size_t' {aka 'unsigned int'}

So use proper modifier (%zu) for size_t.

 [ bp: Massage commit message. ]

Fixes: 8382c668ce4f ("x86/vdso: Add support for exception fixup in vDSO functions")
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
Signed-off-by: Borislav Petkov <bp@...e.de>
Acked-by: Jarkko Sakkinen <jarkko@...nel.org>
Link: https://lkml.kernel.org/r/20210303064357.17056-1-jslaby@suse.cz
---
 arch/x86/entry/vdso/vdso2c.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/entry/vdso/vdso2c.h b/arch/x86/entry/vdso/vdso2c.h
index 1c7cfac..5264daa 100644
--- a/arch/x86/entry/vdso/vdso2c.h
+++ b/arch/x86/entry/vdso/vdso2c.h
@@ -35,7 +35,7 @@ static void BITSFUNC(extract)(const unsigned char *data, size_t data_len,
 	if (offset + len > data_len)
 		fail("section to extract overruns input data");
 
-	fprintf(outfile, "static const unsigned char %s[%lu] = {", name, len);
+	fprintf(outfile, "static const unsigned char %s[%zu] = {", name, len);
 	BITSFUNC(copy)(outfile, data + offset, len);
 	fprintf(outfile, "\n};\n\n");
 }