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authorRusty Russell <rusty@rustcorp.com.au>2014-03-24 12:00:34 +1030
committerRusty Russell <rusty@rustcorp.com.au>2014-03-24 12:21:00 +1030
commit58f86cc89c3372d3e61d5b71e5513ec5a0b02848 (patch)
treeba12cb68846c5e4e04d3442528dee70e58100859 /include/linux/moduleparam.h
parentc6bda7c988a57958108741cde9b1f12e9727a938 (diff)
downloadop-kernel-dev-58f86cc89c3372d3e61d5b71e5513ec5a0b02848.zip
op-kernel-dev-58f86cc89c3372d3e61d5b71e5513ec5a0b02848.tar.gz
VERIFY_OCTAL_PERMISSIONS: stricter checking for sysfs perms.
Summary of http://lkml.org/lkml/2014/3/14/363 : Ted: module_param(queue_depth, int, 444) Joe: 0444! Rusty: User perms >= group perms >= other perms? Joe: CLASS_ATTR, DEVICE_ATTR, SENSOR_ATTR and SENSOR_ATTR_2? Side effect of stricter permissions means removing the unnecessary S_IFREG from several callers. Note that the BUILD_BUG_ON_ZERO((perm) & 2) test was removed: a fair number of drivers fail this test, so that will be the debate for a future patch. Suggested-by: Joe Perches <joe@perches.com> Acked-by: Bjorn Helgaas <bhelgaas@google.com> for drivers/pci/slot.c Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Miklos Szeredi <miklos@szeredi.hu> Cc: Mark Fasheh <mfasheh@suse.com> Cc: Joel Becker <jlbec@evilplan.org> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Diffstat (limited to 'include/linux/moduleparam.h')
-rw-r--r--include/linux/moduleparam.h8
1 files changed, 3 insertions, 5 deletions
diff --git a/include/linux/moduleparam.h b/include/linux/moduleparam.h
index 175f699..204a677 100644
--- a/include/linux/moduleparam.h
+++ b/include/linux/moduleparam.h
@@ -186,14 +186,12 @@ struct kparam_array
parameters. */
#define __module_param_call(prefix, name, ops, arg, perm, level) \
/* Default value instead of permissions? */ \
- static int __param_perm_check_##name __attribute__((unused)) = \
- BUILD_BUG_ON_ZERO((perm) < 0 || (perm) > 0777 || ((perm) & 2)) \
- + BUILD_BUG_ON_ZERO(sizeof(""prefix) > MAX_PARAM_PREFIX_LEN); \
- static const char __param_str_##name[] = prefix #name; \
+ static const char __param_str_##name[] = prefix #name; \
static struct kernel_param __moduleparam_const __param_##name \
__used \
__attribute__ ((unused,__section__ ("__param"),aligned(sizeof(void *)))) \
- = { __param_str_##name, ops, perm, level, { arg } }
+ = { __param_str_##name, ops, VERIFY_OCTAL_PERMISSIONS(perm), \
+ level, { arg } }
/* Obsolete - use module_param_cb() */
#define module_param_call(name, set, get, arg, perm) \
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