From f833116ad2c3eabf9c739946170e07825cca67ed Mon Sep 17 00:00:00 2001 From: "Eric W. Biederman" Date: Wed, 9 Mar 2022 10:37:07 -0600 Subject: [PATCH] coredump: Don't compile flat_core_dump when coredumps are disabled Recently the kernel test robot reported: > In file included from include/linux/kernel.h:29, > from fs/binfmt_flat.c:21: > fs/binfmt_flat.c: In function 'flat_core_dump': > >> fs/binfmt_flat.c:121:50: error: invalid use of undefined type 'struct coredump_params' > 121 | current->comm, current->pid, cprm->siginfo->si_signo); > | ^~ > include/linux/printk.h:418:33: note: in definition of macro 'printk_index_wrap' > 418 | _p_func(_fmt, ##__VA_ARGS__); \ > | ^~~~~~~~~~~ > include/linux/printk.h:499:9: note: in expansion of macro 'printk' > 499 | printk(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__) > | ^~~~~~ > fs/binfmt_flat.c:120:9: note: in expansion of macro 'pr_warn' > 120 | pr_warn("Process %s:%d received signr %d and should have core dumped\n", > | ^~~~~~~ > At top level: > fs/binfmt_flat.c:118:12: warning: 'flat_core_dump' defined but not used [-Wunused-function] > 118 | static int flat_core_dump(struct coredump_params *cprm) > | ^~~~~~~~~~~~~~ The little dinky do nothing function flat_core_dump has always been compiled unconditionally. With my change to move coredump_params into coredump.h coredump_params reasonably becomes unavailable when coredump support is not compiled in. Fix this old issue by simply not compiling flat_core_dump when coredump support is not supported. Fixes: a99a3e2efaf1 ("coredump: Move definition of struct coredump_params into coredump.h") Reported-by: kernel test robot Signed-off-by: "Eric W. Biederman" --- fs/binfmt_flat.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/fs/binfmt_flat.c b/fs/binfmt_flat.c index 208cdce16de1..626898150011 100644 --- a/fs/binfmt_flat.c +++ b/fs/binfmt_flat.c @@ -98,7 +98,9 @@ static int load_flat_shared_library(int id, struct lib_info *p); #endif static int load_flat_binary(struct linux_binprm *); +#ifdef CONFIG_COREDUMP static int flat_core_dump(struct coredump_params *cprm); +#endif static struct linux_binfmt flat_format = { .module = THIS_MODULE, @@ -115,12 +117,14 @@ static struct linux_binfmt flat_format = { * Currently only a stub-function. */ +#ifdef CONFIG_COREDUMP static int flat_core_dump(struct coredump_params *cprm) { pr_warn("Process %s:%d received signr %d and should have core dumped\n", current->comm, current->pid, cprm->siginfo->si_signo); return 1; } +#endif /****************************************************************************/ /*