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authorLinus Torvalds <torvalds@linux-foundation.org>2020-06-11 18:55:43 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2020-06-11 18:55:43 -0700
commitb791d1bdf9212d944d749a5c7ff6febdba241771 (patch)
treec207137a4d4f6b5dae3b1ecdf0ffaa357852fa7c /lib
parent9716e57a0195dae356ae1425df121988abd27131 (diff)
parent1f44328ea24c9de368a3cfe5cc0e110b949afb2e (diff)
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Merge tag 'locking-kcsan-2020-06-11' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull the Kernel Concurrency Sanitizer from Thomas Gleixner: "The Kernel Concurrency Sanitizer (KCSAN) is a dynamic race detector, which relies on compile-time instrumentation, and uses a watchpoint-based sampling approach to detect races. The feature was under development for quite some time and has already found legitimate bugs. Unfortunately it comes with a limitation, which was only understood late in the development cycle: It requires an up to date CLANG-11 compiler CLANG-11 is not yet released (scheduled for June), but it's the only compiler today which handles the kernel requirements and especially the annotations of functions to exclude them from KCSAN instrumentation correctly. These annotations really need to work so that low level entry code and especially int3 text poke handling can be completely isolated. A detailed discussion of the requirements and compiler issues can be found here: https://lore.kernel.org/lkml/CANpmjNMTsY_8241bS7=XAfqvZHFLrVEkv_uM4aDUWE_kh3Rvbw@mail.gmail.com/ We came to the conclusion that trying to work around compiler limitations and bugs again would end up in a major trainwreck, so requiring a working compiler seemed to be the best choice. For Continous Integration purposes the compiler restriction is manageable and that's where most xxSAN reports come from. For a change this limitation might make GCC people actually look at their bugs. Some issues with CSAN in GCC are 7 years old and one has been 'fixed' 3 years ago with a half baken solution which 'solved' the reported issue but not the underlying problem. The KCSAN developers also ponder to use a GCC plugin to become independent, but that's not something which will show up in a few days. Blocking KCSAN until wide spread compiler support is available is not a really good alternative because the continuous growth of lockless optimizations in the kernel demands proper tooling support" * tag 'locking-kcsan-2020-06-11' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (76 commits) compiler_types.h, kasan: Use __SANITIZE_ADDRESS__ instead of CONFIG_KASAN to decide inlining compiler.h: Move function attributes to compiler_types.h compiler.h: Avoid nested statement expression in data_race() compiler.h: Remove data_race() and unnecessary checks from {READ,WRITE}_ONCE() kcsan: Update Documentation to change supported compilers kcsan: Remove 'noinline' from __no_kcsan_or_inline kcsan: Pass option tsan-instrument-read-before-write to Clang kcsan: Support distinguishing volatile accesses kcsan: Restrict supported compilers kcsan: Avoid inserting __tsan_func_entry/exit if possible ubsan, kcsan: Don't combine sanitizer with kcov on clang objtool, kcsan: Add kcsan_disable_current() and kcsan_enable_current_nowarn() kcsan: Add __kcsan_{enable,disable}_current() variants checkpatch: Warn about data_race() without comment kcsan: Use GFP_ATOMIC under spin lock Improve KCSAN documentation a bit kcsan: Make reporting aware of KCSAN tests kcsan: Fix function matching in report kcsan: Change data_race() to no longer require marking racing accesses kcsan: Move kcsan_{disable,enable}_current() to kcsan-checks.h ...
Diffstat (limited to 'lib')
-rw-r--r--lib/Kconfig.debug2
-rw-r--r--lib/Kconfig.kcsan199
-rw-r--r--lib/Kconfig.ubsan11
-rw-r--r--lib/Makefile4
-rw-r--r--lib/iov_iter.c7
-rw-r--r--lib/usercopy.c7
6 files changed, 224 insertions, 6 deletions
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 5beec9c833ce..ef675beccab1 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -1570,6 +1570,8 @@ config PROVIDE_OHCI1394_DMA_INIT
source "samples/Kconfig"
+source "lib/Kconfig.kcsan"
+
config ARCH_HAS_DEVMEM_IS_ALLOWED
bool
diff --git a/lib/Kconfig.kcsan b/lib/Kconfig.kcsan
new file mode 100644
index 000000000000..5ee88e5119c2
--- /dev/null
+++ b/lib/Kconfig.kcsan
@@ -0,0 +1,199 @@
+# SPDX-License-Identifier: GPL-2.0-only
+
+config HAVE_ARCH_KCSAN
+ bool
+
+config HAVE_KCSAN_COMPILER
+ def_bool CC_IS_CLANG && $(cc-option,-fsanitize=thread -mllvm -tsan-distinguish-volatile=1)
+ help
+ For the list of compilers that support KCSAN, please see
+ <file:Documentation/dev-tools/kcsan.rst>.
+
+config KCSAN_KCOV_BROKEN
+ def_bool KCOV && CC_HAS_SANCOV_TRACE_PC
+ depends on CC_IS_CLANG
+ depends on !$(cc-option,-Werror=unused-command-line-argument -fsanitize=thread -fsanitize-coverage=trace-pc)
+ help
+ Some versions of clang support either KCSAN and KCOV but not the
+ combination of the two.
+ See https://bugs.llvm.org/show_bug.cgi?id=45831 for the status
+ in newer releases.
+
+menuconfig KCSAN
+ bool "KCSAN: dynamic data race detector"
+ depends on HAVE_ARCH_KCSAN && HAVE_KCSAN_COMPILER
+ depends on DEBUG_KERNEL && !KASAN
+ depends on !KCSAN_KCOV_BROKEN
+ select STACKTRACE
+ help
+ The Kernel Concurrency Sanitizer (KCSAN) is a dynamic
+ data-race detector that relies on compile-time instrumentation.
+ KCSAN uses a watchpoint-based sampling approach to detect races.
+
+ While KCSAN's primary purpose is to detect data races, it
+ also provides assertions to check data access constraints.
+ These assertions can expose bugs that do not manifest as
+ data races.
+
+ See <file:Documentation/dev-tools/kcsan.rst> for more details.
+
+if KCSAN
+
+config KCSAN_VERBOSE
+ bool "Show verbose reports with more information about system state"
+ depends on PROVE_LOCKING
+ help
+ If enabled, reports show more information about the system state that
+ may help better analyze and debug races. This includes held locks and
+ IRQ trace events.
+
+ While this option should generally be benign, we call into more
+ external functions on report generation; if a race report is
+ generated from any one of them, system stability may suffer due to
+ deadlocks or recursion. If in doubt, say N.
+
+config KCSAN_DEBUG
+ bool "Debugging of KCSAN internals"
+
+config KCSAN_SELFTEST
+ bool "Perform short selftests on boot"
+ default y
+ help
+ Run KCSAN selftests on boot. On test failure, causes the kernel to panic.
+
+config KCSAN_EARLY_ENABLE
+ bool "Early enable during boot"
+ default y
+ help
+ If KCSAN should be enabled globally as soon as possible. KCSAN can
+ later be enabled/disabled via debugfs.
+
+config KCSAN_NUM_WATCHPOINTS
+ int "Number of available watchpoints"
+ default 64
+ help
+ Total number of available watchpoints. An address range maps into a
+ specific watchpoint slot as specified in kernel/kcsan/encoding.h.
+ Although larger number of watchpoints may not be usable due to
+ limited number of CPUs, a larger value helps to improve performance
+ due to reducing cache-line contention. The chosen default is a
+ conservative value; we should almost never observe "no_capacity"
+ events (see /sys/kernel/debug/kcsan).
+
+config KCSAN_UDELAY_TASK
+ int "Delay in microseconds (for tasks)"
+ default 80
+ help
+ For tasks, the microsecond delay after setting up a watchpoint.
+
+config KCSAN_UDELAY_INTERRUPT
+ int "Delay in microseconds (for interrupts)"
+ default 20
+ help
+ For interrupts, the microsecond delay after setting up a watchpoint.
+ Interrupts have tighter latency requirements, and their delay should
+ be lower than for tasks.
+
+config KCSAN_DELAY_RANDOMIZE
+ bool "Randomize above delays"
+ default y
+ help
+ If delays should be randomized, where the maximum is KCSAN_UDELAY_*.
+ If false, the chosen delays are always the KCSAN_UDELAY_* values
+ as defined above.
+
+config KCSAN_SKIP_WATCH
+ int "Skip instructions before setting up watchpoint"
+ default 4000
+ help
+ The number of per-CPU memory operations to skip, before another
+ watchpoint is set up, i.e. one in KCSAN_WATCH_SKIP per-CPU
+ memory operations are used to set up a watchpoint. A smaller value
+ results in more aggressive race detection, whereas a larger value
+ improves system performance at the cost of missing some races.
+
+config KCSAN_SKIP_WATCH_RANDOMIZE
+ bool "Randomize watchpoint instruction skip count"
+ default y
+ help
+ If instruction skip count should be randomized, where the maximum is
+ KCSAN_WATCH_SKIP. If false, the chosen value is always
+ KCSAN_WATCH_SKIP.
+
+config KCSAN_INTERRUPT_WATCHER
+ bool "Interruptible watchers"
+ help
+ If enabled, a task that set up a watchpoint may be interrupted while
+ delayed. This option will allow KCSAN to detect races between
+ interrupted tasks and other threads of execution on the same CPU.
+
+ Currently disabled by default, because not all safe per-CPU access
+ primitives and patterns may be accounted for, and therefore could
+ result in false positives.
+
+config KCSAN_REPORT_ONCE_IN_MS
+ int "Duration in milliseconds, in which any given race is only reported once"
+ default 3000
+ help
+ Any given race is only reported once in the defined time window.
+ Different races may still generate reports within a duration that is
+ smaller than the duration defined here. This allows rate limiting
+ reporting to avoid flooding the console with reports. Setting this
+ to 0 disables rate limiting.
+
+# The main purpose of the below options is to control reported data races (e.g.
+# in fuzzer configs), and are not expected to be switched frequently by other
+# users. We could turn some of them into boot parameters, but given they should
+# not be switched normally, let's keep them here to simplify configuration.
+#
+# The defaults below are chosen to be very conservative, and may miss certain
+# bugs.
+
+config KCSAN_REPORT_RACE_UNKNOWN_ORIGIN
+ bool "Report races of unknown origin"
+ default y
+ help
+ If KCSAN should report races where only one access is known, and the
+ conflicting access is of unknown origin. This type of race is
+ reported if it was only possible to infer a race due to a data value
+ change while an access is being delayed on a watchpoint.
+
+config KCSAN_REPORT_VALUE_CHANGE_ONLY
+ bool "Only report races where watcher observed a data value change"
+ default y
+ help
+ If enabled and a conflicting write is observed via a watchpoint, but
+ the data value of the memory location was observed to remain
+ unchanged, do not report the data race.
+
+config KCSAN_ASSUME_PLAIN_WRITES_ATOMIC
+ bool "Assume that plain aligned writes up to word size are atomic"
+ default y
+ help
+ Assume that plain aligned writes up to word size are atomic by
+ default, and also not subject to other unsafe compiler optimizations
+ resulting in data races. This will cause KCSAN to not report data
+ races due to conflicts where the only plain accesses are aligned
+ writes up to word size: conflicts between marked reads and plain
+ aligned writes up to word size will not be reported as data races;
+ notice that data races between two conflicting plain aligned writes
+ will also not be reported.
+
+config KCSAN_IGNORE_ATOMICS
+ bool "Do not instrument marked atomic accesses"
+ help
+ Never instrument marked atomic accesses. This option can be used for
+ additional filtering. Conflicting marked atomic reads and plain
+ writes will never be reported as a data race, however, will cause
+ plain reads and marked writes to result in "unknown origin" reports.
+ If combined with CONFIG_KCSAN_REPORT_RACE_UNKNOWN_ORIGIN=n, data
+ races where at least one access is marked atomic will never be
+ reported.
+
+ Similar to KCSAN_ASSUME_PLAIN_WRITES_ATOMIC, but including unaligned
+ accesses, conflicting marked atomic reads and plain writes will not
+ be reported as data races; however, unlike that option, data races
+ due to two conflicting plain writes will be reported (aligned and
+ unaligned, if CONFIG_KCSAN_ASSUME_PLAIN_WRITES_ATOMIC=n).
+
+endif # KCSAN
diff --git a/lib/Kconfig.ubsan b/lib/Kconfig.ubsan
index 27bcc2568c95..774315de555a 100644
--- a/lib/Kconfig.ubsan
+++ b/lib/Kconfig.ubsan
@@ -26,9 +26,20 @@ config UBSAN_TRAP
the system. For some system builders this is an acceptable
trade-off.
+config UBSAN_KCOV_BROKEN
+ def_bool KCOV && CC_HAS_SANCOV_TRACE_PC
+ depends on CC_IS_CLANG
+ depends on !$(cc-option,-Werror=unused-command-line-argument -fsanitize=bounds -fsanitize-coverage=trace-pc)
+ help
+ Some versions of clang support either UBSAN or KCOV but not the
+ combination of the two.
+ See https://bugs.llvm.org/show_bug.cgi?id=45831 for the status
+ in newer releases.
+
config UBSAN_BOUNDS
bool "Perform array index bounds checking"
default UBSAN
+ depends on !UBSAN_KCOV_BROKEN
help
This option enables detection of directly indexed out of bounds
array accesses, where the array size is known at compile time.
diff --git a/lib/Makefile b/lib/Makefile
index 315516fa4ef4..b1c42c10073b 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -25,6 +25,9 @@ KASAN_SANITIZE_string.o := n
CFLAGS_string.o := $(call cc-option, -fno-stack-protector)
endif
+# Used by KCSAN while enabled, avoid recursion.
+KCSAN_SANITIZE_random32.o := n
+
lib-y := ctype.o string.o vsprintf.o cmdline.o \
rbtree.o radix-tree.o timerqueue.o xarray.o \
idr.o extable.o sha1.o irq_regs.o argv_split.o \
@@ -296,6 +299,7 @@ endif
UBSAN_SANITIZE_ubsan.o := n
KASAN_SANITIZE_ubsan.o := n
+KCSAN_SANITIZE_ubsan.o := n
CFLAGS_ubsan.o := $(call cc-option, -fno-stack-protector) $(DISABLE_STACKLEAK_PLUGIN)
obj-$(CONFIG_SBITMAP) += sbitmap.o
diff --git a/lib/iov_iter.c b/lib/iov_iter.c
index 51595bf3af85..bf538c2bec77 100644
--- a/lib/iov_iter.c
+++ b/lib/iov_iter.c
@@ -8,6 +8,7 @@
#include <linux/splice.h>
#include <net/checksum.h>
#include <linux/scatterlist.h>
+#include <linux/instrumented.h>
#define PIPE_PARANOIA /* for now */
@@ -138,7 +139,7 @@
static int copyout(void __user *to, const void *from, size_t n)
{
if (access_ok(to, n)) {
- kasan_check_read(from, n);
+ instrument_copy_to_user(to, from, n);
n = raw_copy_to_user(to, from, n);
}
return n;
@@ -147,7 +148,7 @@ static int copyout(void __user *to, const void *from, size_t n)
static int copyin(void *to, const void __user *from, size_t n)
{
if (access_ok(from, n)) {
- kasan_check_write(to, n);
+ instrument_copy_from_user(to, from, n);
n = raw_copy_from_user(to, from, n);
}
return n;
@@ -639,7 +640,7 @@ EXPORT_SYMBOL(_copy_to_iter);
static int copyout_mcsafe(void __user *to, const void *from, size_t n)
{
if (access_ok(to, n)) {
- kasan_check_read(from, n);
+ instrument_copy_to_user(to, from, n);
n = copy_to_user_mcsafe((__force void *) to, from, n);
}
return n;
diff --git a/lib/usercopy.c b/lib/usercopy.c
index ca2a697a2061..b26509f112f9 100644
--- a/lib/usercopy.c
+++ b/lib/usercopy.c
@@ -1,6 +1,7 @@
// SPDX-License-Identifier: GPL-2.0
-#include <linux/uaccess.h>
#include <linux/bitops.h>
+#include <linux/instrumented.h>
+#include <linux/uaccess.h>
/* out-of-line parts */
@@ -10,7 +11,7 @@ unsigned long _copy_from_user(void *to, const void __user *from, unsigned long n
unsigned long res = n;
might_fault();
if (likely(access_ok(from, n))) {
- kasan_check_write(to, n);
+ instrument_copy_from_user(to, from, n);
res = raw_copy_from_user(to, from, n);
}
if (unlikely(res))
@@ -25,7 +26,7 @@ unsigned long _copy_to_user(void __user *to, const void *from, unsigned long n)
{
might_fault();
if (likely(access_ok(to, n))) {
- kasan_check_read(from, n);
+ instrument_copy_to_user(to, from, n);
n = raw_copy_to_user(to, from, n);
}
return n;