Re: [linux-next:master 1997/7806] include/linux/lsm_hook_defs.h:408:18: error: 'uring_sqpoll_default' defined but not used

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On Wed, Oct 13, 2021 at 08:52:15AM -0700, Casey Schaufler wrote:
> On 10/13/2021 7:57 AM, Paul Moore wrote:
> > On Wed, Oct 13, 2021 at 4:17 AM kernel test robot <lkp@xxxxxxxxx> wrote:
> >> Hi Paul,
> >>
> >> FYI, the error/warning still remains.
> > I'm not sure if anyone is monitoring the kernel test robot mail, but
> > this issue isn't unique to the LSM/audit/io_uring patches, it appears
> > to be a general LSM hook issue.
> 
> Looks like fallout from KP Singh's MACRO stuff for BPF.

Does this fix it?


diff --git a/security/security.c b/security/security.c
index 9ffa9e9c5c55..462f14354c2c 100644
--- a/security/security.c
+++ b/security/security.c
@@ -706,7 +706,7 @@ static int lsm_superblock_alloc(struct super_block *sb)
 #define LSM_RET_DEFAULT(NAME) (NAME##_default)
 #define DECLARE_LSM_RET_DEFAULT_void(DEFAULT, NAME)
 #define DECLARE_LSM_RET_DEFAULT_int(DEFAULT, NAME) \
-	static const int LSM_RET_DEFAULT(NAME) = (DEFAULT);
+	static const int __maybe_unused LSM_RET_DEFAULT(NAME) = (DEFAULT);
 #define LSM_HOOK(RET, DEFAULT, NAME, ...) \
 	DECLARE_LSM_RET_DEFAULT_##RET(DEFAULT, NAME)
 

I will go try it...

-Kees

> 
> >
> >> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
> >> head:   8006b911c90a4ec09958447d24c8a4c3538f5723
> >> commit: cdc1404a40461faba23c5a5ad40adcc7eecc1580 [1997/7806] lsm,io_uring: add LSM hooks to io_uring
> >> config: microblaze-buildonly-randconfig-r002-20211012 (attached as .config)
> >> compiler: microblaze-linux-gcc (GCC) 11.2.0
> >> reproduce (this is a W=1 build):
> >>         wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
> >>         chmod +x ~/bin/make.cross
> >>         # https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=cdc1404a40461faba23c5a5ad40adcc7eecc1580
> >>         git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
> >>         git fetch --no-tags linux-next master
> >>         git checkout cdc1404a40461faba23c5a5ad40adcc7eecc1580
> >>         # save the attached .config to linux build tree
> >>         COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross ARCH=microblaze
> >>
> >> If you fix the issue, kindly add following tag as appropriate
> >> Reported-by: kernel test robot <lkp@xxxxxxxxx>
> >>
> >> All errors (new ones prefixed by >>):
> >>
> >>>> include/linux/lsm_hook_defs.h:408:18: error: 'uring_sqpoll_default' defined but not used [-Werror=unused-const-variable=]
> >>      408 | LSM_HOOK(int, 0, uring_sqpoll, void)
> >>          |                  ^~~~~~~~~~~~
> >>    security/security.c:706:32: note: in definition of macro 'LSM_RET_DEFAULT'
> >>      706 | #define LSM_RET_DEFAULT(NAME) (NAME##_default)
> >>          |                                ^~~~
> >>    security/security.c:711:9: note: in expansion of macro 'DECLARE_LSM_RET_DEFAULT_int'
> >>      711 |         DECLARE_LSM_RET_DEFAULT_##RET(DEFAULT, NAME)
> >>          |         ^~~~~~~~~~~~~~~~~~~~~~~~
> >>    include/linux/lsm_hook_defs.h:408:1: note: in expansion of macro 'LSM_HOOK'
> >>      408 | LSM_HOOK(int, 0, uring_sqpoll, void)
> >>          | ^~~~~~~~
> >>>> include/linux/lsm_hook_defs.h:407:18: error: 'uring_override_creds_default' defined but not used [-Werror=unused-const-variable=]
> >>      407 | LSM_HOOK(int, 0, uring_override_creds, const struct cred *new)
> >>          |                  ^~~~~~~~~~~~~~~~~~~~
> >>    security/security.c:706:32: note: in definition of macro 'LSM_RET_DEFAULT'
> >>      706 | #define LSM_RET_DEFAULT(NAME) (NAME##_default)
> >>          |                                ^~~~
> >>    security/security.c:711:9: note: in expansion of macro 'DECLARE_LSM_RET_DEFAULT_int'
> >>      711 |         DECLARE_LSM_RET_DEFAULT_##RET(DEFAULT, NAME)
> >>          |         ^~~~~~~~~~~~~~~~~~~~~~~~
> >>    include/linux/lsm_hook_defs.h:407:1: note: in expansion of macro 'LSM_HOOK'
> >>      407 | LSM_HOOK(int, 0, uring_override_creds, const struct cred *new)
> >>          | ^~~~~~~~
> >>    include/linux/lsm_hook_defs.h:396:18: error: 'locked_down_default' defined but not used [-Werror=unused-const-variable=]
> >>      396 | LSM_HOOK(int, 0, locked_down, enum lockdown_reason what)
> >>          |                  ^~~~~~~~~~~
> >>    security/security.c:706:32: note: in definition of macro 'LSM_RET_DEFAULT'
> >>      706 | #define LSM_RET_DEFAULT(NAME) (NAME##_default)
> >>          |                                ^~~~
> >>    security/security.c:711:9: note: in expansion of macro 'DECLARE_LSM_RET_DEFAULT_int'
> >>      711 |         DECLARE_LSM_RET_DEFAULT_##RET(DEFAULT, NAME)
> >>          |         ^~~~~~~~~~~~~~~~~~~~~~~~
> >>    include/linux/lsm_hook_defs.h:396:1: note: in expansion of macro 'LSM_HOOK'
> >>      396 | LSM_HOOK(int, 0, locked_down, enum lockdown_reason what)
> >>          | ^~~~~~~~
> >>    include/linux/lsm_hook_defs.h:392:18: error: 'bpf_prog_alloc_security_default' defined but not used [-Werror=unused-const-variable=]
> >>      392 | LSM_HOOK(int, 0, bpf_prog_alloc_security, struct bpf_prog_aux *aux)
> >>          |                  ^~~~~~~~~~~~~~~~~~~~~~~
> >>    security/security.c:706:32: note: in definition of macro 'LSM_RET_DEFAULT'
> >>      706 | #define LSM_RET_DEFAULT(NAME) (NAME##_default)
> >>          |                                ^~~~
> >>    security/security.c:711:9: note: in expansion of macro 'DECLARE_LSM_RET_DEFAULT_int'
> >>      711 |         DECLARE_LSM_RET_DEFAULT_##RET(DEFAULT, NAME)
> >>          |         ^~~~~~~~~~~~~~~~~~~~~~~~
> >>    include/linux/lsm_hook_defs.h:392:1: note: in expansion of macro 'LSM_HOOK'
> >>      392 | LSM_HOOK(int, 0, bpf_prog_alloc_security, struct bpf_prog_aux *aux)
> >>          | ^~~~~~~~
> >>    include/linux/lsm_hook_defs.h:390:18: error: 'bpf_map_alloc_security_default' defined but not used [-Werror=unused-const-variable=]
> >>      390 | LSM_HOOK(int, 0, bpf_map_alloc_security, struct bpf_map *map)
> >>          |                  ^~~~~~~~~~~~~~~~~~~~~~
> >>    security/security.c:706:32: note: in definition of macro 'LSM_RET_DEFAULT'
> >>      706 | #define LSM_RET_DEFAULT(NAME) (NAME##_default)
> >>          |                                ^~~~
> >>    security/security.c:711:9: note: in expansion of macro 'DECLARE_LSM_RET_DEFAULT_int'
> >>      711 |         DECLARE_LSM_RET_DEFAULT_##RET(DEFAULT, NAME)
> >>          |         ^~~~~~~~~~~~~~~~~~~~~~~~
> >>    include/linux/lsm_hook_defs.h:390:1: note: in expansion of macro 'LSM_HOOK'
> >>      390 | LSM_HOOK(int, 0, bpf_map_alloc_security, struct bpf_map *map)
> >>          | ^~~~~~~~
> >>    include/linux/lsm_hook_defs.h:389:18: error: 'bpf_prog_default' defined but not used [-Werror=unused-const-variable=]
> >>      389 | LSM_HOOK(int, 0, bpf_prog, struct bpf_prog *prog)
> >>          |                  ^~~~~~~~
> >>    security/security.c:706:32: note: in definition of macro 'LSM_RET_DEFAULT'
> >>      706 | #define LSM_RET_DEFAULT(NAME) (NAME##_default)
> >>          |                                ^~~~
> >>    security/security.c:711:9: note: in expansion of macro 'DECLARE_LSM_RET_DEFAULT_int'
> >>      711 |         DECLARE_LSM_RET_DEFAULT_##RET(DEFAULT, NAME)
> >>          |         ^~~~~~~~~~~~~~~~~~~~~~~~
> >>    include/linux/lsm_hook_defs.h:389:1: note: in expansion of macro 'LSM_HOOK'
> >>      389 | LSM_HOOK(int, 0, bpf_prog, struct bpf_prog *prog)
> >>          | ^~~~~~~~
> >>    include/linux/lsm_hook_defs.h:388:18: error: 'bpf_map_default' defined but not used [-Werror=unused-const-variable=]
> >>      388 | LSM_HOOK(int, 0, bpf_map, struct bpf_map *map, fmode_t fmode)
> >>          |                  ^~~~~~~
> >>    security/security.c:706:32: note: in definition of macro 'LSM_RET_DEFAULT'
> >>      706 | #define LSM_RET_DEFAULT(NAME) (NAME##_default)
> >>          |                                ^~~~
> >>    security/security.c:711:9: note: in expansion of macro 'DECLARE_LSM_RET_DEFAULT_int'
> >>      711 |         DECLARE_LSM_RET_DEFAULT_##RET(DEFAULT, NAME)
> >>          |         ^~~~~~~~~~~~~~~~~~~~~~~~
> >>    include/linux/lsm_hook_defs.h:388:1: note: in expansion of macro 'LSM_HOOK'
> >>      388 | LSM_HOOK(int, 0, bpf_map, struct bpf_map *map, fmode_t fmode)
> >>          | ^~~~~~~~
> >>    include/linux/lsm_hook_defs.h:387:18: error: 'bpf_default' defined but not used [-Werror=unused-const-variable=]
> >>      387 | LSM_HOOK(int, 0, bpf, int cmd, union bpf_attr *attr, unsigned int size)
> >>          |                  ^~~
> >>    security/security.c:706:32: note: in definition of macro 'LSM_RET_DEFAULT'
> >>      706 | #define LSM_RET_DEFAULT(NAME) (NAME##_default)
> >>          |                                ^~~~
> >>    security/security.c:711:9: note: in expansion of macro 'DECLARE_LSM_RET_DEFAULT_int'
> >>      711 |         DECLARE_LSM_RET_DEFAULT_##RET(DEFAULT, NAME)
> >>          |         ^~~~~~~~~~~~~~~~~~~~~~~~
> >>    include/linux/lsm_hook_defs.h:387:1: note: in expansion of macro 'LSM_HOOK'
> >>      387 | LSM_HOOK(int, 0, bpf, int cmd, union bpf_attr *attr, unsigned int size)
> >>          | ^~~~~~~~
> >>    include/linux/lsm_hook_defs.h:382:18: error: 'audit_rule_match_default' defined but not used [-Werror=unused-const-variable=]
> >>      382 | LSM_HOOK(int, 0, audit_rule_match, u32 secid, u32 field, u32 op, void *lsmrule)
> >>          |                  ^~~~~~~~~~~~~~~~
> >>    security/security.c:706:32: note: in definition of macro 'LSM_RET_DEFAULT'
> >>      706 | #define LSM_RET_DEFAULT(NAME) (NAME##_default)
> >>          |                                ^~~~
> >>    security/security.c:711:9: note: in expansion of macro 'DECLARE_LSM_RET_DEFAULT_int'
> >>      711 |         DECLARE_LSM_RET_DEFAULT_##RET(DEFAULT, NAME)
> >>          |         ^~~~~~~~~~~~~~~~~~~~~~~~
> >>    include/linux/lsm_hook_defs.h:382:1: note: in expansion of macro 'LSM_HOOK'
> >>      382 | LSM_HOOK(int, 0, audit_rule_match, u32 secid, u32 field, u32 op, void *lsmrule)
> >>          | ^~~~~~~~
> >>    include/linux/lsm_hook_defs.h:381:18: error: 'audit_rule_known_default' defined but not used [-Werror=unused-const-variable=]
> >>      381 | LSM_HOOK(int, 0, audit_rule_known, struct audit_krule *krule)
> >>          |                  ^~~~~~~~~~~~~~~~
> >>    security/security.c:706:32: note: in definition of macro 'LSM_RET_DEFAULT'
> >>      706 | #define LSM_RET_DEFAULT(NAME) (NAME##_default)
> >>
> >>
> >> vim +/uring_sqpoll_default +408 include/linux/lsm_hook_defs.h
> >>
> >>    405
> >>    406  #ifdef CONFIG_IO_URING
> >>  > 407  LSM_HOOK(int, 0, uring_override_creds, const struct cred *new)
> >>  > 408  LSM_HOOK(int, 0, uring_sqpoll, void)
> >>
> >> ---
> >> 0-DAY CI Kernel Test Service, Intel Corporation
> >> https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx
> >
> >
> 

-- 
Kees Cook




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