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SubjectRe: [PATCH] Kbuild: Disable the -Wformat-security gcc flag
Date
 > Before judging on this patch could you please post what warning it
> triggers and one or a few patches to fix some of them.

The warnings are things like:

init/main.c: In function 'start_kernel':
init/main.c:557: warning: format not a string literal and no format arguments

where the patch to fix this would be:

diff --git a/init/main.c b/init/main.c
index 8442094..78fc0d8 100644
--- a/init/main.c
+++ b/init/main.c
@@ -554,7 +554,7 @@ asmlinkage void __init start_kernel(void)
boot_cpu_init();
page_address_init();
printk(KERN_NOTICE);
- printk(linux_banner);
+ printk("%s", linux_banner);
setup_arch(&command_line);
mm_init_owner(&init_mm, &init_task);
setup_command_line(command_line);
with the impact:

add/remove: 0/0 grow/shrink: 1/0 up/down: 7/0 (7)
function old new delta
start_kernel 689 696 +7


There are also many warnings like:

drivers/char/mem.c: In function 'chr_dev_init':
drivers/char/mem.c:994: warning: format not a string literal and no format arguments

which require a similar fix but show that we can't just restrict things
to some trick with printk():

diff --git a/drivers/char/mem.c b/drivers/char/mem.c
index 3586b3b..ba3bf43 100644
--- a/drivers/char/mem.c
+++ b/drivers/char/mem.c
@@ -991,7 +991,7 @@ static int __init chr_dev_init(void)
for (i = 0; i < ARRAY_SIZE(devlist); i++)
device_create(mem_class, NULL,
MKDEV(MEM_MAJOR, devlist[i].minor), NULL,
- devlist[i].name);
+ "%s", devlist[i].name);

return 0;
}

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