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From: Joshua Watt <jpewhacker@gmail.com>
To: linux-nfs@vger.kernel.org
Subject: Re: [nfs-utils PATCH v2] Add printf format checking
Date: Mon, 16 Sep 2019 13:33:52 -0500
Message-ID: <4bafb8fa-4908-c66f-8f4c-6b4b65acdeba@gmail.com> (raw)
In-Reply-To: <20190906202425.15013-1-JPEWhacker@gmail.com>

On 9/6/19 3:24 PM, Joshua Watt wrote:
> Adds a configure time check for __attribute__((format)) and then uses it
> to enforce checking the format of several printf-like functions. Several
> invalid uses of format codes that were discovered have now been fixed.
>
> V2: Fix use of "%jd" format code on an argument that wasn't intmax_t

ping?

>
> Signed-off-by: Joshua Watt <JPEWhacker@gmail.com>
> ---
>   aclocal/ax_gcc_func_attribute.m4 | 238 +++++++++++++++++++++++++++++++
>   configure.ac                     |   1 +
>   support/include/xcommon.h        |  18 ++-
>   support/include/xlog.h           |  20 ++-
>   support/nfs/svc_create.c         |   2 +-
>   support/nsm/rpc.c                |   2 +-
>   utils/exportfs/exportfs.c        |   3 +
>   utils/mountd/cache.c             |   3 +-
>   utils/mountd/mountd.c            |   4 +-
>   utils/nfsdcld/nfsdcld.c          |   2 +-
>   utils/nfsdcld/sqlite.c           |   2 +-
>   utils/nfsidmap/nfsidmap.c        |   8 +-
>   utils/statd/rmtcall.c            |   2 +-
>   utils/statd/statd.c              |   2 +-
>   utils/statd/svc_run.c            |   5 +-
>   15 files changed, 287 insertions(+), 25 deletions(-)
>   create mode 100644 aclocal/ax_gcc_func_attribute.m4
>
> diff --git a/aclocal/ax_gcc_func_attribute.m4 b/aclocal/ax_gcc_func_attribute.m4
> new file mode 100644
> index 00000000..098c9aad
> --- /dev/null
> +++ b/aclocal/ax_gcc_func_attribute.m4
> @@ -0,0 +1,238 @@
> +# ===========================================================================
> +#  https://www.gnu.org/software/autoconf-archive/ax_gcc_func_attribute.html
> +# ===========================================================================
> +#
> +# SYNOPSIS
> +#
> +#   AX_GCC_FUNC_ATTRIBUTE(ATTRIBUTE)
> +#
> +# DESCRIPTION
> +#
> +#   This macro checks if the compiler supports one of GCC's function
> +#   attributes; many other compilers also provide function attributes with
> +#   the same syntax. Compiler warnings are used to detect supported
> +#   attributes as unsupported ones are ignored by default so quieting
> +#   warnings when using this macro will yield false positives.
> +#
> +#   The ATTRIBUTE parameter holds the name of the attribute to be checked.
> +#
> +#   If ATTRIBUTE is supported define HAVE_FUNC_ATTRIBUTE_<ATTRIBUTE>.
> +#
> +#   The macro caches its result in the ax_cv_have_func_attribute_<attribute>
> +#   variable.
> +#
> +#   The macro currently supports the following function attributes:
> +#
> +#    alias
> +#    aligned
> +#    alloc_size
> +#    always_inline
> +#    artificial
> +#    cold
> +#    const
> +#    constructor
> +#    constructor_priority for constructor attribute with priority
> +#    deprecated
> +#    destructor
> +#    dllexport
> +#    dllimport
> +#    error
> +#    externally_visible
> +#    fallthrough
> +#    flatten
> +#    format
> +#    format_arg
> +#    gnu_inline
> +#    hot
> +#    ifunc
> +#    leaf
> +#    malloc
> +#    noclone
> +#    noinline
> +#    nonnull
> +#    noreturn
> +#    nothrow
> +#    optimize
> +#    pure
> +#    sentinel
> +#    sentinel_position
> +#    unused
> +#    used
> +#    visibility
> +#    warning
> +#    warn_unused_result
> +#    weak
> +#    weakref
> +#
> +#   Unsupported function attributes will be tested with a prototype
> +#   returning an int and not accepting any arguments and the result of the
> +#   check might be wrong or meaningless so use with care.
> +#
> +# LICENSE
> +#
> +#   Copyright (c) 2013 Gabriele Svelto <gabriele.svelto@gmail.com>
> +#
> +#   Copying and distribution of this file, with or without modification, are
> +#   permitted in any medium without royalty provided the copyright notice
> +#   and this notice are preserved.  This file is offered as-is, without any
> +#   warranty.
> +
> +#serial 9
> +
> +AC_DEFUN([AX_GCC_FUNC_ATTRIBUTE], [
> +    AS_VAR_PUSHDEF([ac_var], [ax_cv_have_func_attribute_$1])
> +
> +    AC_CACHE_CHECK([for __attribute__(($1))], [ac_var], [
> +        AC_LINK_IFELSE([AC_LANG_PROGRAM([
> +            m4_case([$1],
> +                [alias], [
> +                    int foo( void ) { return 0; }
> +                    int bar( void ) __attribute__(($1("foo")));
> +                ],
> +                [aligned], [
> +                    int foo( void ) __attribute__(($1(32)));
> +                ],
> +                [alloc_size], [
> +                    void *foo(int a) __attribute__(($1(1)));
> +                ],
> +                [always_inline], [
> +                    inline __attribute__(($1)) int foo( void ) { return 0; }
> +                ],
> +                [artificial], [
> +                    inline __attribute__(($1)) int foo( void ) { return 0; }
> +                ],
> +                [cold], [
> +                    int foo( void ) __attribute__(($1));
> +                ],
> +                [const], [
> +                    int foo( void ) __attribute__(($1));
> +                ],
> +                [constructor_priority], [
> +                    int foo( void ) __attribute__((__constructor__(65535/2)));
> +                ],
> +                [constructor], [
> +                    int foo( void ) __attribute__(($1));
> +                ],
> +                [deprecated], [
> +                    int foo( void ) __attribute__(($1("")));
> +                ],
> +                [destructor], [
> +                    int foo( void ) __attribute__(($1));
> +                ],
> +                [dllexport], [
> +                    __attribute__(($1)) int foo( void ) { return 0; }
> +                ],
> +                [dllimport], [
> +                    int foo( void ) __attribute__(($1));
> +                ],
> +                [error], [
> +                    int foo( void ) __attribute__(($1("")));
> +                ],
> +                [externally_visible], [
> +                    int foo( void ) __attribute__(($1));
> +                ],
> +                [fallthrough], [
> +                    int foo( void ) {switch (0) { case 1: __attribute__(($1)); case 2: break ; }};
> +                ],
> +                [flatten], [
> +                    int foo( void ) __attribute__(($1));
> +                ],
> +                [format], [
> +                    int foo(const char *p, ...) __attribute__(($1(printf, 1, 2)));
> +                ],
> +                [format_arg], [
> +                    char *foo(const char *p) __attribute__(($1(1)));
> +                ],
> +                [gnu_inline], [
> +                    inline __attribute__(($1)) int foo( void ) { return 0; }
> +                ],
> +                [hot], [
> +                    int foo( void ) __attribute__(($1));
> +                ],
> +                [ifunc], [
> +                    int my_foo( void ) { return 0; }
> +                    static int (*resolve_foo(void))(void) { return my_foo; }
> +                    int foo( void ) __attribute__(($1("resolve_foo")));
> +                ],
> +                [leaf], [
> +                    __attribute__(($1)) int foo( void ) { return 0; }
> +                ],
> +                [malloc], [
> +                    void *foo( void ) __attribute__(($1));
> +                ],
> +                [noclone], [
> +                    int foo( void ) __attribute__(($1));
> +                ],
> +                [noinline], [
> +                    __attribute__(($1)) int foo( void ) { return 0; }
> +                ],
> +                [nonnull], [
> +                    int foo(char *p) __attribute__(($1(1)));
> +                ],
> +                [noreturn], [
> +                    void foo( void ) __attribute__(($1));
> +                ],
> +                [nothrow], [
> +                    int foo( void ) __attribute__(($1));
> +                ],
> +                [optimize], [
> +                    __attribute__(($1(3))) int foo( void ) { return 0; }
> +                ],
> +                [pure], [
> +                    int foo( void ) __attribute__(($1));
> +                ],
> +                [sentinel], [
> +                    int foo(void *p, ...) __attribute__(($1));
> +                ],
> +                [sentinel_position], [
> +                    int foo(void *p, ...) __attribute__(($1(1)));
> +                ],
> +                [returns_nonnull], [
> +                    void *foo( void ) __attribute__(($1));
> +                ],
> +                [unused], [
> +                    int foo( void ) __attribute__(($1));
> +                ],
> +                [used], [
> +                    int foo( void ) __attribute__(($1));
> +                ],
> +                [visibility], [
> +                    int foo_def( void ) __attribute__(($1("default")));
> +                    int foo_hid( void ) __attribute__(($1("hidden")));
> +                    int foo_int( void ) __attribute__(($1("internal")));
> +                    int foo_pro( void ) __attribute__(($1("protected")));
> +                ],
> +                [warning], [
> +                    int foo( void ) __attribute__(($1("")));
> +                ],
> +                [warn_unused_result], [
> +                    int foo( void ) __attribute__(($1));
> +                ],
> +                [weak], [
> +                    int foo( void ) __attribute__(($1));
> +                ],
> +                [weakref], [
> +                    static int foo( void ) { return 0; }
> +                    static int bar( void ) __attribute__(($1("foo")));
> +                ],
> +                [
> +                 m4_warn([syntax], [Unsupported attribute $1, the test may fail])
> +                 int foo( void ) __attribute__(($1));
> +                ]
> +            )], [])
> +            ],
> +            dnl GCC doesn't exit with an error if an unknown attribute is
> +            dnl provided but only outputs a warning, so accept the attribute
> +            dnl only if no warning were issued.
> +            [AS_IF([test -s conftest.err],
> +                [AS_VAR_SET([ac_var], [no])],
> +                [AS_VAR_SET([ac_var], [yes])])],
> +            [AS_VAR_SET([ac_var], [no])])
> +    ])
> +
> +    AS_IF([test yes = AS_VAR_GET([ac_var])],
> +        [AC_DEFINE_UNQUOTED(AS_TR_CPP(HAVE_FUNC_ATTRIBUTE_$1), 1,
> +            [Define to 1 if the system has the `$1' function attribute])], [])
> +
> +    AS_VAR_POPDEF([ac_var])
> +])
> diff --git a/configure.ac b/configure.ac
> index 37096944..639199a9 100644
> --- a/configure.ac
> +++ b/configure.ac
> @@ -619,6 +619,7 @@ CHECK_CCSUPPORT([-Werror=format-overflow=2], [flg1])
>   CHECK_CCSUPPORT([-Werror=int-conversion], [flg2])
>   CHECK_CCSUPPORT([-Werror=incompatible-pointer-types], [flg3])
>   CHECK_CCSUPPORT([-Werror=misleading-indentation], [flg4])
> +AX_GCC_FUNC_ATTRIBUTE([format])
>   
>   AC_SUBST([AM_CFLAGS], ["$my_am_cflags $flg1 $flg2 $flg3 $flg4"])
>   
> diff --git a/support/include/xcommon.h b/support/include/xcommon.h
> index 23c9a135..30b0403b 100644
> --- a/support/include/xcommon.h
> +++ b/support/include/xcommon.h
> @@ -9,6 +9,10 @@
>   #ifndef _XMALLOC_H
>   #define _MALLOC_H
>   
> +#ifdef HAVE_CONFIG_H
> +#include <config.h>
> +#endif
> +
>   #include <sys/types.h>
>   #include <fcntl.h>
>   #include <limits.h>
> @@ -25,9 +29,15 @@
>   
>   #define streq(s, t)	(strcmp ((s), (t)) == 0)
>   
> -/* Functions in sundries.c that are used in mount.c and umount.c  */
> +#ifdef HAVE_FUNC_ATTRIBUTE_FORMAT
> +#define X_FORMAT(_x) __attribute__((__format__ _x))
> +#else
> +#define X_FORMAT(_x)
> +#endif
> +
> +/* Functions in sundries.c that are used in mount.c and umount.c  */
>   char *canonicalize (const char *path);
> -void nfs_error (const char *fmt, ...);
> +void nfs_error (const char *fmt, ...) X_FORMAT((printf, 1, 2));
>   void *xmalloc (size_t size);
>   void *xrealloc(void *p, size_t size);
>   void xfree(void *);
> @@ -36,9 +46,9 @@ char *xstrndup (const char *s, int n);
>   char *xstrconcat2 (const char *, const char *);
>   char *xstrconcat3 (const char *, const char *, const char *);
>   char *xstrconcat4 (const char *, const char *, const char *, const char *);
> -void die (int errcode, const char *fmt, ...);
> +void die (int errcode, const char *fmt, ...) X_FORMAT((printf, 2, 3));
>   
> -extern void die(int err, const char *fmt, ...);
> +extern void die(int err, const char *fmt, ...) X_FORMAT((printf, 2, 3));
>   extern void (*at_die)(void);
>   
>   /* exit status - bits below are ORed */
> diff --git a/support/include/xlog.h b/support/include/xlog.h
> index a11463ed..32ff5a1b 100644
> --- a/support/include/xlog.h
> +++ b/support/include/xlog.h
> @@ -7,6 +7,10 @@
>   #ifndef XLOG_H
>   #define XLOG_H
>   
> +#ifdef HAVE_CONFIG_H
> +#include <config.h>
> +#endif
> +
>   #include <stdarg.h>
>   
>   /* These are logged always. L_FATAL also does exit(1) */
> @@ -35,6 +39,12 @@ struct xlog_debugfac {
>   	int		df_fac;
>   };
>   
> +#ifdef HAVE_FUNC_ATTRIBUTE_FORMAT
> +#define XLOG_FORMAT(_x) __attribute__((__format__ _x))
> +#else
> +#define XLOG_FORMAT(_x)
> +#endif
> +
>   extern int export_errno;
>   void			xlog_open(char *progname);
>   void			xlog_stderr(int on);
> @@ -43,10 +53,10 @@ void			xlog_config(int fac, int on);
>   void			xlog_sconfig(char *, int on);
>   void			xlog_from_conffile(char *);
>   int			xlog_enabled(int fac);
> -void			xlog(int fac, const char *fmt, ...);
> -void			xlog_warn(const char *fmt, ...);
> -void			xlog_err(const char *fmt, ...);
> -void			xlog_errno(int err, const char *fmt, ...);
> -void			xlog_backend(int fac, const char *fmt, va_list args);
> +void			xlog(int fac, const char *fmt, ...) XLOG_FORMAT((printf, 2, 3));
> +void			xlog_warn(const char *fmt, ...) XLOG_FORMAT((printf, 1, 2));
> +void			xlog_err(const char *fmt, ...) XLOG_FORMAT((printf, 1, 2));
> +void			xlog_errno(int err, const char *fmt, ...) XLOG_FORMAT((printf, 2, 3));
> +void			xlog_backend(int fac, const char *fmt, va_list args) XLOG_FORMAT((printf, 2, 0));
>   
>   #endif /* XLOG_H */
> diff --git a/support/nfs/svc_create.c b/support/nfs/svc_create.c
> index 4e14430d..976c2d29 100644
> --- a/support/nfs/svc_create.c
> +++ b/support/nfs/svc_create.c
> @@ -184,7 +184,7 @@ svc_create_sock(const struct sockaddr *sap, socklen_t salen,
>   		type = SOCK_STREAM;
>   		break;
>   	default:
> -		xlog(D_GENERAL, "%s: Unrecognized bind address semantics: %u",
> +		xlog(D_GENERAL, "%s: Unrecognized bind address semantics: %lu",
>   			__func__, nconf->nc_semantics);
>   		return -1;
>   	}
> diff --git a/support/nsm/rpc.c b/support/nsm/rpc.c
> index ae49006c..08b4746f 100644
> --- a/support/nsm/rpc.c
> +++ b/support/nsm/rpc.c
> @@ -182,7 +182,7 @@ nsm_xmit_getport(const int sock, const struct sockaddr_in *sin,
>   	uint32_t xid;
>   	XDR xdr;
>   
> -	xlog(D_CALL, "Sending PMAP_GETPORT for %u, %u, udp", program, version);
> +	xlog(D_CALL, "Sending PMAP_GETPORT for %lu, %lu, udp", program, version);
>   
>   	nsm_init_xdrmem(msgbuf, NSM_MAXMSGSIZE, &xdr);
>   	xid = nsm_init_rpc_header(PMAPPROG, PMAPVERS,
> diff --git a/utils/exportfs/exportfs.c b/utils/exportfs/exportfs.c
> index 5cca4175..a04a7898 100644
> --- a/utils/exportfs/exportfs.c
> +++ b/utils/exportfs/exportfs.c
> @@ -651,6 +651,9 @@ out:
>   	return result;
>   }
>   
> +#ifdef HAVE_FUNC_ATTRIBUTE_FORMAT
> +__attribute__((format (printf, 2, 3)))
> +#endif
>   static char
>   dumpopt(char c, char *fmt, ...)
>   {
> diff --git a/utils/mountd/cache.c b/utils/mountd/cache.c
> index e25a4337..3861f84a 100644
> --- a/utils/mountd/cache.c
> +++ b/utils/mountd/cache.c
> @@ -987,8 +987,7 @@ lookup_export(char *dom, char *path, struct addrinfo *ai)
>   			} else if (found_type == i && found->m_warned == 0) {
>   				xlog(L_WARNING, "%s exported to both %s and %s, "
>   				     "arbitrarily choosing options from first",
> -				     path, found->m_client->m_hostname, exp->m_client->m_hostname,
> -				     dom);
> +				     path, found->m_client->m_hostname, exp->m_client->m_hostname);
>   				found->m_warned = 1;
>   			}
>   		}
> diff --git a/utils/mountd/mountd.c b/utils/mountd/mountd.c
> index 33571ecb..66366434 100644
> --- a/utils/mountd/mountd.c
> +++ b/utils/mountd/mountd.c
> @@ -210,10 +210,10 @@ killer (int sig)
>   }
>   
>   static void
> -sig_hup (int sig)
> +sig_hup (int UNUSED(sig))
>   {
>   	/* don't exit on SIGHUP */
> -	xlog (L_NOTICE, "Received SIGHUP... Ignoring.\n", sig);
> +	xlog (L_NOTICE, "Received SIGHUP... Ignoring.\n");
>   	return;
>   }
>   
> diff --git a/utils/nfsdcld/nfsdcld.c b/utils/nfsdcld/nfsdcld.c
> index cbf71fc6..7e894e49 100644
> --- a/utils/nfsdcld/nfsdcld.c
> +++ b/utils/nfsdcld/nfsdcld.c
> @@ -212,7 +212,7 @@ cld_inotify_cb(int UNUSED(fd), short which, void *data)
>   	default:
>   		/* anything else is fatal */
>   		xlog(L_FATAL, "%s: unable to open new pipe (%d). Aborting.",
> -			ret, __func__);
> +			__func__, ret);
>   		exit(ret);
>   	}
>   
> diff --git a/utils/nfsdcld/sqlite.c b/utils/nfsdcld/sqlite.c
> index fa81df87..afa63499 100644
> --- a/utils/nfsdcld/sqlite.c
> +++ b/utils/nfsdcld/sqlite.c
> @@ -473,7 +473,7 @@ sqlite_fix_table_name(const char *name)
>   	}
>   	ret = sqlite3_exec(dbh, (const char *)buf, NULL, NULL, &err);
>   	if (ret != SQLITE_OK) {
> -		xlog(L_ERROR, "Unable to fix table for epoch %d: %s",
> +		xlog(L_ERROR, "Unable to fix table for epoch %"PRIu64": %s",
>   		     val, err);
>   		goto out;
>   	}
> diff --git a/utils/nfsidmap/nfsidmap.c b/utils/nfsidmap/nfsidmap.c
> index fc00da7a..cf7f65e9 100644
> --- a/utils/nfsidmap/nfsidmap.c
> +++ b/utils/nfsidmap/nfsidmap.c
> @@ -18,7 +18,7 @@
>   #include "xcommon.h"
>   
>   int verbose = 0;
> -char *usage = "Usage: %s [-vh] [-c || [-u|-g|-r key] || -d || -l || [-t timeout] key desc]";
> +#define USAGE "Usage: %s [-vh] [-c || [-u|-g|-r key] || -d || -l || [-t timeout] key desc]"
>   
>   #define MAX_ID_LEN   11
>   #define IDMAP_NAMESZ 128
> @@ -403,7 +403,7 @@ int main(int argc, char **argv)
>   			break;
>   		case 'h':
>   		default:
> -			xlog_warn(usage, progname);
> +			xlog_warn(USAGE, progname);
>   			exit(opt == 'h' ? 0 : 1);
>   		}
>   	}
> @@ -435,7 +435,7 @@ int main(int argc, char **argv)
>   	xlog_stderr(verbose);
>   	if ((argc - optind) != 2) {
>   		xlog_warn("Bad arg count. Check /etc/request-key.conf");
> -		xlog_warn(usage, progname);
> +		xlog_warn(USAGE, progname);
>   		return EXIT_FAILURE;
>   	}
>   
> @@ -453,7 +453,7 @@ int main(int argc, char **argv)
>   		return EXIT_FAILURE;
>   	}
>   	if (verbose) {
> -		xlog_warn("key: 0x%lx type: %s value: %s timeout %ld",
> +		xlog_warn("key: 0x%x type: %s value: %s timeout %d",
>   			key, type, value, timeout);
>   	}
>   
> diff --git a/utils/statd/rmtcall.c b/utils/statd/rmtcall.c
> index c4f6364f..5b261480 100644
> --- a/utils/statd/rmtcall.c
> +++ b/utils/statd/rmtcall.c
> @@ -247,7 +247,7 @@ process_reply(FD_SET_TYPE *rfds)
>   		xlog_warn("%s: service %d not registered on localhost",
>   			__func__, NL_MY_PROG(lp));
>   	} else {
> -		xlog(D_GENERAL, "%s: Callback to %s (for %d) succeeded",
> +		xlog(D_GENERAL, "%s: Callback to %s (for %s) succeeded",
>   			__func__, NL_MY_NAME(lp), NL_MON_NAME(lp));
>   	}
>   	nlist_free(&notify, lp);
> diff --git a/utils/statd/statd.c b/utils/statd/statd.c
> index 14673800..8eef2ff2 100644
> --- a/utils/statd/statd.c
> +++ b/utils/statd/statd.c
> @@ -136,7 +136,7 @@ static void log_modes(void)
>   	strcat(buf, "TI-RPC ");
>   #endif
>   
> -	xlog_warn(buf);
> +	xlog_warn("%s", buf);
>   }
>   
>   /*
> diff --git a/utils/statd/svc_run.c b/utils/statd/svc_run.c
> index d1dbd74a..e343c768 100644
> --- a/utils/statd/svc_run.c
> +++ b/utils/statd/svc_run.c
> @@ -53,6 +53,7 @@
>   
>   #include <errno.h>
>   #include <time.h>
> +#include <inttypes.h>
>   #include "statd.h"
>   #include "notlist.h"
>   
> @@ -104,8 +105,8 @@ my_svc_run(int sockfd)
>   
>   			tv.tv_sec  = NL_WHEN(notify) - now;
>   			tv.tv_usec = 0;
> -			xlog(D_GENERAL, "Waiting for reply... (timeo %d)",
> -							tv.tv_sec);
> +			xlog(D_GENERAL, "Waiting for reply... (timeo %jd)",
> +							(intmax_t)tv.tv_sec);
>   			selret = select(FD_SETSIZE, &readfds,
>   				(void *) 0, (void *) 0, &tv);
>   		} else {

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Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-09-06 16:33 [nfs-utils PATCH] " Joshua Watt
2019-09-06 20:24 ` [nfs-utils PATCH v2] " Joshua Watt
2019-09-16 18:33   ` Joshua Watt [this message]
2019-09-20 14:05     ` Steve Dickson
2019-09-23 14:04       ` Joshua Watt
2019-09-23 21:53         ` Steve Dickson

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