linux-hardening - [PATCH] pstore/blk: Use "%lu" to format unsigned long

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Date:   Thu, 18 Nov 2021 10:26:21 -0800
From:   Kees Cook <keescook@...omium.org>
To:     Jens Axboe <axboe@...nel.dk>
Cc:     Kees Cook <keescook@...omium.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        stable@...r.kernel.org, Christoph Hellwig <hch@....de>,
        Anton Vorontsov <anton@...msg.org>,
        Colin Cross <ccross@...roid.com>,
        Tony Luck <tony.luck@...el.com>, linux-kernel@...r.kernel.org,
        linux-hardening@...r.kernel.org
Subject: [PATCH] pstore/blk: Use "%lu" to format unsigned long

From: Geert Uytterhoeven <geert@...ux-m68k.org>

On 32-bit:

    fs/pstore/blk.c: In function ‘__best_effort_init’:
    include/linux/kern_levels.h:5:18: warning: format ‘%zu’ expects argument of type ‘size_t’, but argument 3 has type ‘long unsigned int’ [-Wformat=]
	5 | #define KERN_SOH "\001"  /* ASCII Start Of Header */
	  |                  ^~~~~~
    include/linux/kern_levels.h:14:19: note: in expansion of macro ‘KERN_SOH’
       14 | #define KERN_INFO KERN_SOH "6" /* informational */
	  |                   ^~~~~~~~
    include/linux/printk.h:373:9: note: in expansion of macro ‘KERN_INFO’
      373 |  printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
	  |         ^~~~~~~~~
    fs/pstore/blk.c:314:3: note: in expansion of macro ‘pr_info’
      314 |   pr_info("attached %s (%zu) (no dedicated panic_write!)\n",
	  |   ^~~~~~~

Cc: stable@...r.kernel.org
Fixes: 7bb9557b48fcabaa ("pstore/blk: Use the normal block device I/O path")
Signed-off-by: Geert Uytterhoeven <geert@...ux-m68k.org>
Signed-off-by: Kees Cook <keescook@...omium.org>
Link: https://lore.kernel.org/r/20210629103700.1935012-1-geert@linux-m68k.org
---
 fs/pstore/blk.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/pstore/blk.c b/fs/pstore/blk.c
index 5d1fbaffd66a..4ae0cfcd15f2 100644
--- a/fs/pstore/blk.c
+++ b/fs/pstore/blk.c
@@ -309,7 +309,7 @@ static int __init __best_effort_init(void)
 	if (ret)
 		kfree(best_effort_dev);
 	else
-		pr_info("attached %s (%zu) (no dedicated panic_write!)\n",
+		pr_info("attached %s (%lu) (no dedicated panic_write!)\n",
 			blkdev, best_effort_dev->zone.total_size);
 
 	return ret;
-- 
2.30.2