From: Nathan Chancellor <nathan@kernel.org>
To: "Rafael J. Wysocki" <rjw@rjwysocki.net>,
Len Brown <lenb@kernel.org>, Kees Cook <keescook@chromium.org>,
Sami Tolvanen <samitolvanen@google.com>
Cc: linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org,
clang-built-linux@googlegroups.com,
Nathan Chancellor <nathan@kernel.org>
Subject: [PATCH] ACPI / CPPC: Replace cppc_attr with kobj_attribute
Date: Wed, 7 Apr 2021 14:30:48 -0700 [thread overview]
Message-ID: <20210407213048.940498-1-nathan@kernel.org> (raw)
All of the CPPC sysfs show functions are called via indirect call in
kobj_attr_show(), where they should be of type
ssize_t (*show)(struct kobject *kobj, struct kobj_attribute *attr, char *buf);
because that is the type of the ->show() member in
'struct kobj_attribute' but they are actually of type
ssize_t (*show)(struct kobject *kobj, struct attribute *attr, char *buf);
because of the ->show() member in 'struct cppc_attr', resulting in a
Control Flow Integrity violation [1].
$ cat /sys/devices/system/cpu/cpu0/acpi_cppc/highest_perf
3400
$ dmesg | grep "CFI failure"
[ 175.970559] CFI failure (target: show_highest_perf+0x0/0x8):
As far as I can tell, the only different between 'struct cppc_attr' and
'struct kobj_attribute' aside from the type of the attr parameter is the
type of the count parameter in the ->store() member (ssize_t vs.
size_t), which does not actually matter because all of these nodes are
read-only.
Eliminate 'struct cppc_attr' in favor of 'struct kobj_attribute' to fix
the violation.
[1]: https://lore.kernel.org/r/20210401233216.2540591-1-samitolvanen@google.com/
Fixes: 158c998ea44b ("ACPI / CPPC: add sysfs support to compute delivered performance")
Link: https://github.com/ClangBuiltLinux/linux/issues/1343
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
---
drivers/acpi/cppc_acpi.c | 14 +++-----------
1 file changed, 3 insertions(+), 11 deletions(-)
diff --git a/drivers/acpi/cppc_acpi.c b/drivers/acpi/cppc_acpi.c
index 69057fcd2c04..a5e6fd0bafa1 100644
--- a/drivers/acpi/cppc_acpi.c
+++ b/drivers/acpi/cppc_acpi.c
@@ -119,23 +119,15 @@ static DEFINE_PER_CPU(struct cpc_desc *, cpc_desc_ptr);
*/
#define NUM_RETRIES 500ULL
-struct cppc_attr {
- struct attribute attr;
- ssize_t (*show)(struct kobject *kobj,
- struct attribute *attr, char *buf);
- ssize_t (*store)(struct kobject *kobj,
- struct attribute *attr, const char *c, ssize_t count);
-};
-
#define define_one_cppc_ro(_name) \
-static struct cppc_attr _name = \
+static struct kobj_attribute _name = \
__ATTR(_name, 0444, show_##_name, NULL)
#define to_cpc_desc(a) container_of(a, struct cpc_desc, kobj)
#define show_cppc_data(access_fn, struct_name, member_name) \
static ssize_t show_##member_name(struct kobject *kobj, \
- struct attribute *attr, char *buf) \
+ struct kobj_attribute *attr, char *buf) \
{ \
struct cpc_desc *cpc_ptr = to_cpc_desc(kobj); \
struct struct_name st_name = {0}; \
@@ -161,7 +153,7 @@ show_cppc_data(cppc_get_perf_ctrs, cppc_perf_fb_ctrs, reference_perf);
show_cppc_data(cppc_get_perf_ctrs, cppc_perf_fb_ctrs, wraparound_time);
static ssize_t show_feedback_ctrs(struct kobject *kobj,
- struct attribute *attr, char *buf)
+ struct kobj_attribute *attr, char *buf)
{
struct cpc_desc *cpc_ptr = to_cpc_desc(kobj);
struct cppc_perf_fb_ctrs fb_ctrs = {0};
base-commit: 454859c552da78b0f587205d308401922b56863e
--
2.31.0
next reply other threads:[~2021-04-07 21:32 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-07 21:30 Nathan Chancellor [this message]
2021-04-08 17:59 ` [PATCH] ACPI / CPPC: Replace cppc_attr with kobj_attribute Rafael J. Wysocki
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