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Date: Wed, 6 Dec 2017 12:29:50 -0800
From: tip-bot for Greg Kroah-Hartman <tipbot@...or.com>
To: linux-tip-commits@...r.kernel.org
Cc: mingo@...nel.org, linux-kernel@...r.kernel.org, hpa@...or.com,
stable@...r.kernel.org, gregkh@...uxfoundation.org,
tglx@...utronix.de, torvalds@...ux-foundation.org,
ard.biesheuvel@...aro.org, matt@...eblueprint.co.uk,
peterz@...radead.org, dyoung@...hat.com
Subject: [tip:efi/urgent] efi: Move some sysfs files to be read-only by root
Commit-ID: af97a77bc01ce49a466f9d4c0125479e2e2230b6
Gitweb: https://git.kernel.org/tip/af97a77bc01ce49a466f9d4c0125479e2e2230b6
Author: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
AuthorDate: Wed, 6 Dec 2017 09:50:08 +0000
Committer: Ingo Molnar <mingo@...nel.org>
CommitDate: Wed, 6 Dec 2017 19:31:39 +0100
efi: Move some sysfs files to be read-only by root
Thanks to the scripts/leaking_addresses.pl script, it was found that
some EFI values should not be readable by non-root users.
So make them root-only, and to do that, add a __ATTR_RO_MODE() macro to
make this easier, and use it in other places at the same time.
Reported-by: Linus Torvalds <torvalds@...ux-foundation.org>
Tested-by: Dave Young <dyoung@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@...aro.org>
Cc: H. Peter Anvin <hpa@...or.com>
Cc: Matt Fleming <matt@...eblueprint.co.uk>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: linux-efi@...r.kernel.org
Cc: stable <stable@...r.kernel.org>
Link: http://lkml.kernel.org/r/20171206095010.24170-2-ard.biesheuvel@linaro.org
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
drivers/firmware/efi/efi.c | 3 +--
drivers/firmware/efi/esrt.c | 15 ++++++---------
drivers/firmware/efi/runtime-map.c | 10 +++++-----
include/linux/sysfs.h | 6 ++++++
4 files changed, 18 insertions(+), 16 deletions(-)
diff --git a/drivers/firmware/efi/efi.c b/drivers/firmware/efi/efi.c
index f70febf..c3eefa1 100644
--- a/drivers/firmware/efi/efi.c
+++ b/drivers/firmware/efi/efi.c
@@ -143,8 +143,7 @@ static ssize_t systab_show(struct kobject *kobj,
return str - buf;
}
-static struct kobj_attribute efi_attr_systab =
- __ATTR(systab, 0400, systab_show, NULL);
+static struct kobj_attribute efi_attr_systab = __ATTR_RO_MODE(systab, 0400);
#define EFI_FIELD(var) efi.var
diff --git a/drivers/firmware/efi/esrt.c b/drivers/firmware/efi/esrt.c
index bd7ed3c..7aae248 100644
--- a/drivers/firmware/efi/esrt.c
+++ b/drivers/firmware/efi/esrt.c
@@ -106,7 +106,7 @@ static const struct sysfs_ops esre_attr_ops = {
};
/* Generic ESRT Entry ("ESRE") support. */
-static ssize_t esre_fw_class_show(struct esre_entry *entry, char *buf)
+static ssize_t fw_class_show(struct esre_entry *entry, char *buf)
{
char *str = buf;
@@ -117,18 +117,16 @@ static ssize_t esre_fw_class_show(struct esre_entry *entry, char *buf)
return str - buf;
}
-static struct esre_attribute esre_fw_class = __ATTR(fw_class, 0400,
- esre_fw_class_show, NULL);
+static struct esre_attribute esre_fw_class = __ATTR_RO_MODE(fw_class, 0400);
#define esre_attr_decl(name, size, fmt) \
-static ssize_t esre_##name##_show(struct esre_entry *entry, char *buf) \
+static ssize_t name##_show(struct esre_entry *entry, char *buf) \
{ \
return sprintf(buf, fmt "\n", \
le##size##_to_cpu(entry->esre.esre1->name)); \
} \
\
-static struct esre_attribute esre_##name = __ATTR(name, 0400, \
- esre_##name##_show, NULL)
+static struct esre_attribute esre_##name = __ATTR_RO_MODE(name, 0400)
esre_attr_decl(fw_type, 32, "%u");
esre_attr_decl(fw_version, 32, "%u");
@@ -193,14 +191,13 @@ static int esre_create_sysfs_entry(void *esre, int entry_num)
/* support for displaying ESRT fields at the top level */
#define esrt_attr_decl(name, size, fmt) \
-static ssize_t esrt_##name##_show(struct kobject *kobj, \
+static ssize_t name##_show(struct kobject *kobj, \
struct kobj_attribute *attr, char *buf)\
{ \
return sprintf(buf, fmt "\n", le##size##_to_cpu(esrt->name)); \
} \
\
-static struct kobj_attribute esrt_##name = __ATTR(name, 0400, \
- esrt_##name##_show, NULL)
+static struct kobj_attribute esrt_##name = __ATTR_RO_MODE(name, 0400)
esrt_attr_decl(fw_resource_count, 32, "%u");
esrt_attr_decl(fw_resource_count_max, 32, "%u");
diff --git a/drivers/firmware/efi/runtime-map.c b/drivers/firmware/efi/runtime-map.c
index 8e64b77..f377609 100644
--- a/drivers/firmware/efi/runtime-map.c
+++ b/drivers/firmware/efi/runtime-map.c
@@ -63,11 +63,11 @@ static ssize_t map_attr_show(struct kobject *kobj, struct attribute *attr,
return map_attr->show(entry, buf);
}
-static struct map_attribute map_type_attr = __ATTR_RO(type);
-static struct map_attribute map_phys_addr_attr = __ATTR_RO(phys_addr);
-static struct map_attribute map_virt_addr_attr = __ATTR_RO(virt_addr);
-static struct map_attribute map_num_pages_attr = __ATTR_RO(num_pages);
-static struct map_attribute map_attribute_attr = __ATTR_RO(attribute);
+static struct map_attribute map_type_attr = __ATTR_RO_MODE(type, 0400);
+static struct map_attribute map_phys_addr_attr = __ATTR_RO_MODE(phys_addr, 0400);
+static struct map_attribute map_virt_addr_attr = __ATTR_RO_MODE(virt_addr, 0400);
+static struct map_attribute map_num_pages_attr = __ATTR_RO_MODE(num_pages, 0400);
+static struct map_attribute map_attribute_attr = __ATTR_RO_MODE(attribute, 0400);
/*
* These are default attributes that are added for every memmap entry.
diff --git a/include/linux/sysfs.h b/include/linux/sysfs.h
index e32dfe0..40839c0 100644
--- a/include/linux/sysfs.h
+++ b/include/linux/sysfs.h
@@ -117,6 +117,12 @@ struct attribute_group {
.show = _name##_show, \
}
+#define __ATTR_RO_MODE(_name, _mode) { \
+ .attr = { .name = __stringify(_name), \
+ .mode = VERIFY_OCTAL_PERMISSIONS(_mode) }, \
+ .show = _name##_show, \
+}
+
#define __ATTR_WO(_name) { \
.attr = { .name = __stringify(_name), .mode = S_IWUSR }, \
.store = _name##_store, \
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