netdev - [PATCH] iavf: Use printf instead of gnu_printf for iavf_debug

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-next>] [day] [month] [year] [list]

Message-Id: <20190110042157.8445-1-natechancellor@gmail.com>
Date:   Wed,  9 Jan 2019 21:21:57 -0700
From:   Nathan Chancellor <natechancellor@...il.com>
To:     Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Cc:     "David S. Miller" <davem@...emloft.net>,
        intel-wired-lan@...ts.osuosl.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Nathan Chancellor <natechancellor@...il.com>,
        Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
Subject: [PATCH] iavf: Use printf instead of gnu_printf for iavf_debug_d

Clang warns:

In file included from drivers/net/ethernet/intel/iavf/iavf_main.c:4:
In file included from drivers/net/ethernet/intel/iavf/iavf.h:37:
In file included from drivers/net/ethernet/intel/iavf/iavf_type.h:8:
drivers/net/ethernet/intel/iavf/iavf_osdep.h:49:18: warning: 'format' attribute argument not supported: gnu_printf [-Wignored-attributes]
        __attribute__ ((format(gnu_printf, 3, 4)));
                        ^
1 warning generated.

We can convert from gnu_printf to printf without any side effects for
two reasons:

1. All iavf_debug instances use standard printf formats, as pointed out
   by Miguel Ojeda at the below link, meaning gnu_printf is not strictly
   required.

2. However, GCC has aliased printf to gnu_printf on Linux since at least
   2010 based on git history.

   From gcc/c-family/c-format.c:

   /* Attributes such as "printf" are equivalent to those such as
      "gnu_printf" unless this is overridden by a target.  */
   static const target_ovr_attr gnu_target_overrides_format_attributes[] =
   {
     { "gnu_printf",   "printf" },
     { "gnu_scanf",    "scanf" },
     { "gnu_strftime", "strftime" },
     { "gnu_strfmon",  "strfmon" },
     { NULL,           NULL }
   };

The mentioned override only happens on Windows (mingw32). Changing from
gnu_printf to printf is a no-op for GCC and stops Clang from warning.

Link: https://github.com/ClangBuiltLinux/linux/issues/111
Suggested-by: Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
Signed-off-by: Nathan Chancellor <natechancellor@...il.com>
---
 drivers/net/ethernet/intel/iavf/iavf_osdep.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/intel/iavf/iavf_osdep.h b/drivers/net/ethernet/intel/iavf/iavf_osdep.h
index e6e0b0328706..c90cafb526d0 100644
--- a/drivers/net/ethernet/intel/iavf/iavf_osdep.h
+++ b/drivers/net/ethernet/intel/iavf/iavf_osdep.h
@@ -46,7 +46,7 @@ struct iavf_virt_mem {
 
 #define iavf_debug(h, m, s, ...)  iavf_debug_d(h, m, s, ##__VA_ARGS__)
 extern void iavf_debug_d(void *hw, u32 mask, char *fmt_str, ...)
-	__attribute__ ((format(gnu_printf, 3, 4)));
+	__printf(3, 4);
 
 typedef enum iavf_status_code iavf_status;
 #endif /* _IAVF_OSDEP_H_ */
-- 
2.20.1