linux-kernel - [PATCH 5.11 124/601] x86/vdso: Use proper modifier for lens format specifier in extract()

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Date:   Wed, 12 May 2021 16:43:21 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Jiri Slaby <jslaby@...e.cz>,
        Borislav Petkov <bp@...e.de>,
        Jarkko Sakkinen <jarkko@...nel.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.11 124/601] x86/vdso: Use proper modifier for lens format specifier in extract()

From: Jiri Slaby <jslaby@...e.cz>

[ Upstream commit 70c9d959226b7c5c48c119e2c1cfc1424f87b023 ]

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
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 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 1c7cfac7e64a..5264daa8859f 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");
 }
-- 
2.30.2