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Message-ID: <201808010038.2G0e4vR6%fengguang.wu@intel.com>
Date: Wed, 1 Aug 2018 00:29:05 +0800
From: kbuild test robot <lkp@...el.com>
To: Jinbum Park <jinb.park7@...il.com>
Cc: kbuild-all@...org, peterz@...radead.org, mingo@...hat.com,
acme@...nel.org, alexander.shishkin@...ux.intel.com,
jolsa@...hat.com, namhyung@...nel.org, linux-kernel@...r.kernel.org,
kernel-hardening@...ts.openwall.com
Subject: Re: [PATCH] perf/core: Fix possible Spectre-v1 for
perf_swevent_enabled
Hi Jinbum,
Thank you for the patch! Yet something to improve:
[auto build test ERROR on tip/perf/core]
[also build test ERROR on v4.18-rc7 next-20180727]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]
url: https://github.com/0day-ci/linux/commits/Jinbum-Park/perf-core-Fix-possible-Spectre-v1-for-perf_swevent_enabled/20180731-235311
config: i386-randconfig-x077-201830 (attached as .config)
compiler: gcc-7 (Debian 7.3.0-16) 7.3.0
reproduce:
# save the attached .config to linux build tree
make ARCH=i386
All error/warnings (new ones prefixed by >>):
Cyclomatic Complexity 11 kernel//events/core.c:perf_event_read_local
Cyclomatic Complexity 4 kernel//events/core.c:perf_event_task_enable
Cyclomatic Complexity 4 kernel//events/core.c:perf_event_task_disable
Cyclomatic Complexity 1 kernel//events/core.c:arch_perf_update_userpage
Cyclomatic Complexity 6 kernel//events/core.c:perf_event_update_userpage
Cyclomatic Complexity 3 kernel//events/core.c:__perf_event_sync_stat
Cyclomatic Complexity 8 kernel//events/core.c:perf_event_sync_stat
Cyclomatic Complexity 15 kernel//events/core.c:perf_event_context_sched_out
Cyclomatic Complexity 5 kernel//events/core.c:__perf_event_task_sched_out
Cyclomatic Complexity 1 kernel//events/core.c:_perf_event_reset
Cyclomatic Complexity 2 kernel//events/core.c:task_clock_event_add
Cyclomatic Complexity 2 kernel//events/core.c:cpu_clock_event_add
Cyclomatic Complexity 6 kernel//events/core.c:ring_buffer_get
Cyclomatic Complexity 3 kernel//events/core.c:ring_buffer_put
Cyclomatic Complexity 8 kernel//events/core.c:ring_buffer_attach
Cyclomatic Complexity 8 kernel//events/core.c:_free_event
Cyclomatic Complexity 3 kernel//events/core.c:free_event
Cyclomatic Complexity 9 kernel//events/core.c:perf_event_create_kernel_counter
Cyclomatic Complexity 10 kernel//events/core.c:inherit_event
Cyclomatic Complexity 7 kernel//events/core.c:inherit_group
Cyclomatic Complexity 5 kernel//events/core.c:inherit_task_group
Cyclomatic Complexity 18 kernel//events/core.c:perf_event_init_context
Cyclomatic Complexity 2 kernel//events/core.c:put_event
Cyclomatic Complexity 14 kernel//events/core.c:perf_event_release_kernel
Cyclomatic Complexity 1 kernel//events/core.c:perf_release
Cyclomatic Complexity 3 kernel//events/core.c:perf_free_event
Cyclomatic Complexity 44 kernel//events/core.c:perf_mmap
Cyclomatic Complexity 14 kernel//events/core.c:perf_event_set_output
Cyclomatic Complexity 84 kernel//events/core.c:__do_sys_perf_event_open
Cyclomatic Complexity 1 kernel//events/core.c:__se_sys_perf_event_open
Cyclomatic Complexity 23 kernel//events/core.c:_perf_ioctl
Cyclomatic Complexity 1 kernel//events/core.c:perf_ioctl
Cyclomatic Complexity 13 kernel//events/core.c:perf_mmap_close
Cyclomatic Complexity 2 kernel//events/core.c:perf_event_wakeup
Cyclomatic Complexity 2 kernel//events/core.c:perf_event_header__init_id
Cyclomatic Complexity 2 kernel//events/core.c:perf_event__output_id_sample
Cyclomatic Complexity 3 kernel//events/core.c:perf_log_throttle
Cyclomatic Complexity 12 kernel//events/core.c:perf_adjust_freq_unthr_context
Cyclomatic Complexity 11 kernel//events/core.c:perf_event_task_tick
Cyclomatic Complexity 6 kernel//events/core.c:__perf_event_account_interrupt
Cyclomatic Complexity 6 kernel//events/core.c:__perf_event_overflow
Cyclomatic Complexity 8 kernel//events/core.c:perf_swevent_hrtimer
Cyclomatic Complexity 5 kernel//events/core.c:__perf_event_period
Cyclomatic Complexity 5 kernel//events/core.c:perf_log_itrace_start
Cyclomatic Complexity 12 kernel//events/core.c:event_sched_in
Cyclomatic Complexity 14 kernel//events/core.c:group_sched_in
Cyclomatic Complexity 6 kernel//events/core.c:pinned_sched_in
Cyclomatic Complexity 5 kernel//events/core.c:flexible_sched_in
Cyclomatic Complexity 5 kernel//events/core.c:perf_event_switch_output
Cyclomatic Complexity 3 kernel//events/core.c:perf_event_task_output
Cyclomatic Complexity 3 kernel//events/core.c:perf_event_comm_output
Cyclomatic Complexity 3 kernel//events/core.c:perf_event_namespaces_output
Cyclomatic Complexity 5 kernel//events/core.c:perf_event_mmap_output
Cyclomatic Complexity 2 kernel//events/core.c:perf_event_read_event
Cyclomatic Complexity 2 kernel//events/core.c:sync_child_event
Cyclomatic Complexity 5 kernel//events/core.c:perf_event_exit_event
Cyclomatic Complexity 8 kernel//events/core.c:perf_event_exit_task_context
Cyclomatic Complexity 31 kernel//events/core.c:perf_output_sample
Cyclomatic Complexity 5 kernel//events/core.c:perf_callchain
Cyclomatic Complexity 19 kernel//events/core.c:perf_prepare_sample
Cyclomatic Complexity 1 kernel//events/core.c:perf_event_output
Cyclomatic Complexity 3 kernel//events/core.c:perf_event_exec
Cyclomatic Complexity 3 kernel//events/core.c:perf_event_comm
Cyclomatic Complexity 2 kernel//events/core.c:perf_event_namespaces
Cyclomatic Complexity 1 kernel//events/core.c:perf_event_fork
Cyclomatic Complexity 2 kernel//events/core.c:perf_event_mmap
Cyclomatic Complexity 2 kernel//events/core.c:perf_event_aux_event
Cyclomatic Complexity 2 kernel//events/core.c:perf_log_lost_samples
Cyclomatic Complexity 1 kernel//events/core.c:perf_event_itrace_started
Cyclomatic Complexity 1 kernel//events/core.c:perf_event_account_interrupt
Cyclomatic Complexity 1 kernel//events/core.c:perf_event_overflow
Cyclomatic Complexity 3 kernel//events/core.c:perf_swevent_set_period
Cyclomatic Complexity 5 kernel//events/core.c:perf_swevent_overflow
Cyclomatic Complexity 9 kernel//events/core.c:perf_swevent_event
Cyclomatic Complexity 8 kernel//events/core.c:do_perf_sw_event
Cyclomatic Complexity 4 kernel//events/core.c:perf_swevent_add
Cyclomatic Complexity 1 kernel//events/core.c:perf_swevent_put_recursion_context
Cyclomatic Complexity 5 kernel//events/core.c:perf_pending_event
Cyclomatic Complexity 3 kernel//events/core.c:___perf_sw_event
Cyclomatic Complexity 2 kernel//events/core.c:__perf_sw_event
Cyclomatic Complexity 3 kernel//events/core.c:perf_bp_event
Cyclomatic Complexity 7 kernel//events/core.c:perf_event_exit_task
Cyclomatic Complexity 7 kernel//events/core.c:perf_event_free_task
Cyclomatic Complexity 3 kernel//events/core.c:perf_event_delayed_put
Cyclomatic Complexity 3 kernel//events/core.c:perf_event_get
Cyclomatic Complexity 2 kernel//events/core.c:perf_get_event
Cyclomatic Complexity 2 kernel//events/core.c:perf_event_attrs
Cyclomatic Complexity 3 kernel//events/core.c:perf_event_init_task
Cyclomatic Complexity 5 kernel//events/core.c:perf_swevent_init_cpu
Cyclomatic Complexity 4 kernel//events/core.c:perf_event_init_cpu
Cyclomatic Complexity 1 kernel//events/core.c:perf_event_exit_cpu
Cyclomatic Complexity 2 kernel//events/core.c:perf_reboot
Cyclomatic Complexity 3 kernel//events/core.c:perf_event_init
In file included from include/linux/kernel.h:10:0,
from include/linux/list.h:9,
from include/linux/wait.h:7,
from include/linux/wait_bit.h:8,
from include/linux/fs.h:6,
from kernel//events/core.c:12:
kernel//events/core.c: In function 'perf_swevent_init':
>> include/linux/compiler.h:339:38: error: call to '__compiletime_assert_8204' declared with attribute error: BUILD_BUG_ON failed: sizeof(_s) > sizeof(long)
_compiletime_assert(condition, msg, __compiletime_assert_, __LINE__)
^
include/linux/compiler.h:319:4: note: in definition of macro '__compiletime_assert'
prefix ## suffix(); \
^~~~~~
include/linux/compiler.h:339:2: note: in expansion of macro '_compiletime_assert'
_compiletime_assert(condition, msg, __compiletime_assert_, __LINE__)
^~~~~~~~~~~~~~~~~~~
include/linux/build_bug.h:45:37: note: in expansion of macro 'compiletime_assert'
#define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
^~~~~~~~~~~~~~~~~~
include/linux/build_bug.h:69:2: note: in expansion of macro 'BUILD_BUG_ON_MSG'
BUILD_BUG_ON_MSG(condition, "BUILD_BUG_ON failed: " #condition)
^~~~~~~~~~~~~~~~
>> include/linux/nospec.h:55:2: note: in expansion of macro 'BUILD_BUG_ON'
BUILD_BUG_ON(sizeof(_i) > sizeof(long)); \
^~~~~~~~~~~~
>> kernel//events/core.c:8204:14: note: in expansion of macro 'array_index_nospec'
event_id = array_index_nospec(event_id, PERF_COUNT_SW_MAX);
^~~~~~~~~~~~~~~~~~
--
Cyclomatic Complexity 11 kernel/events/core.c:perf_event_read_local
Cyclomatic Complexity 4 kernel/events/core.c:perf_event_task_enable
Cyclomatic Complexity 4 kernel/events/core.c:perf_event_task_disable
Cyclomatic Complexity 1 kernel/events/core.c:arch_perf_update_userpage
Cyclomatic Complexity 6 kernel/events/core.c:perf_event_update_userpage
Cyclomatic Complexity 3 kernel/events/core.c:__perf_event_sync_stat
Cyclomatic Complexity 8 kernel/events/core.c:perf_event_sync_stat
Cyclomatic Complexity 15 kernel/events/core.c:perf_event_context_sched_out
Cyclomatic Complexity 5 kernel/events/core.c:__perf_event_task_sched_out
Cyclomatic Complexity 1 kernel/events/core.c:_perf_event_reset
Cyclomatic Complexity 2 kernel/events/core.c:task_clock_event_add
Cyclomatic Complexity 2 kernel/events/core.c:cpu_clock_event_add
Cyclomatic Complexity 6 kernel/events/core.c:ring_buffer_get
Cyclomatic Complexity 3 kernel/events/core.c:ring_buffer_put
Cyclomatic Complexity 8 kernel/events/core.c:ring_buffer_attach
Cyclomatic Complexity 8 kernel/events/core.c:_free_event
Cyclomatic Complexity 3 kernel/events/core.c:free_event
Cyclomatic Complexity 9 kernel/events/core.c:perf_event_create_kernel_counter
Cyclomatic Complexity 10 kernel/events/core.c:inherit_event
Cyclomatic Complexity 7 kernel/events/core.c:inherit_group
Cyclomatic Complexity 5 kernel/events/core.c:inherit_task_group
Cyclomatic Complexity 18 kernel/events/core.c:perf_event_init_context
Cyclomatic Complexity 2 kernel/events/core.c:put_event
Cyclomatic Complexity 14 kernel/events/core.c:perf_event_release_kernel
Cyclomatic Complexity 1 kernel/events/core.c:perf_release
Cyclomatic Complexity 3 kernel/events/core.c:perf_free_event
Cyclomatic Complexity 44 kernel/events/core.c:perf_mmap
Cyclomatic Complexity 14 kernel/events/core.c:perf_event_set_output
Cyclomatic Complexity 84 kernel/events/core.c:__do_sys_perf_event_open
Cyclomatic Complexity 1 kernel/events/core.c:__se_sys_perf_event_open
Cyclomatic Complexity 23 kernel/events/core.c:_perf_ioctl
Cyclomatic Complexity 1 kernel/events/core.c:perf_ioctl
Cyclomatic Complexity 13 kernel/events/core.c:perf_mmap_close
Cyclomatic Complexity 2 kernel/events/core.c:perf_event_wakeup
Cyclomatic Complexity 2 kernel/events/core.c:perf_event_header__init_id
Cyclomatic Complexity 2 kernel/events/core.c:perf_event__output_id_sample
Cyclomatic Complexity 3 kernel/events/core.c:perf_log_throttle
Cyclomatic Complexity 12 kernel/events/core.c:perf_adjust_freq_unthr_context
Cyclomatic Complexity 11 kernel/events/core.c:perf_event_task_tick
Cyclomatic Complexity 6 kernel/events/core.c:__perf_event_account_interrupt
Cyclomatic Complexity 6 kernel/events/core.c:__perf_event_overflow
Cyclomatic Complexity 8 kernel/events/core.c:perf_swevent_hrtimer
Cyclomatic Complexity 5 kernel/events/core.c:__perf_event_period
Cyclomatic Complexity 5 kernel/events/core.c:perf_log_itrace_start
Cyclomatic Complexity 12 kernel/events/core.c:event_sched_in
Cyclomatic Complexity 14 kernel/events/core.c:group_sched_in
Cyclomatic Complexity 6 kernel/events/core.c:pinned_sched_in
Cyclomatic Complexity 5 kernel/events/core.c:flexible_sched_in
Cyclomatic Complexity 5 kernel/events/core.c:perf_event_switch_output
Cyclomatic Complexity 3 kernel/events/core.c:perf_event_task_output
Cyclomatic Complexity 3 kernel/events/core.c:perf_event_comm_output
Cyclomatic Complexity 3 kernel/events/core.c:perf_event_namespaces_output
Cyclomatic Complexity 5 kernel/events/core.c:perf_event_mmap_output
Cyclomatic Complexity 2 kernel/events/core.c:perf_event_read_event
Cyclomatic Complexity 2 kernel/events/core.c:sync_child_event
Cyclomatic Complexity 5 kernel/events/core.c:perf_event_exit_event
Cyclomatic Complexity 8 kernel/events/core.c:perf_event_exit_task_context
Cyclomatic Complexity 31 kernel/events/core.c:perf_output_sample
Cyclomatic Complexity 5 kernel/events/core.c:perf_callchain
Cyclomatic Complexity 19 kernel/events/core.c:perf_prepare_sample
Cyclomatic Complexity 1 kernel/events/core.c:perf_event_output
Cyclomatic Complexity 3 kernel/events/core.c:perf_event_exec
Cyclomatic Complexity 3 kernel/events/core.c:perf_event_comm
Cyclomatic Complexity 2 kernel/events/core.c:perf_event_namespaces
Cyclomatic Complexity 1 kernel/events/core.c:perf_event_fork
Cyclomatic Complexity 2 kernel/events/core.c:perf_event_mmap
Cyclomatic Complexity 2 kernel/events/core.c:perf_event_aux_event
Cyclomatic Complexity 2 kernel/events/core.c:perf_log_lost_samples
Cyclomatic Complexity 1 kernel/events/core.c:perf_event_itrace_started
Cyclomatic Complexity 1 kernel/events/core.c:perf_event_account_interrupt
Cyclomatic Complexity 1 kernel/events/core.c:perf_event_overflow
Cyclomatic Complexity 3 kernel/events/core.c:perf_swevent_set_period
Cyclomatic Complexity 5 kernel/events/core.c:perf_swevent_overflow
Cyclomatic Complexity 9 kernel/events/core.c:perf_swevent_event
Cyclomatic Complexity 8 kernel/events/core.c:do_perf_sw_event
Cyclomatic Complexity 4 kernel/events/core.c:perf_swevent_add
Cyclomatic Complexity 1 kernel/events/core.c:perf_swevent_put_recursion_context
Cyclomatic Complexity 5 kernel/events/core.c:perf_pending_event
Cyclomatic Complexity 3 kernel/events/core.c:___perf_sw_event
Cyclomatic Complexity 2 kernel/events/core.c:__perf_sw_event
Cyclomatic Complexity 3 kernel/events/core.c:perf_bp_event
Cyclomatic Complexity 7 kernel/events/core.c:perf_event_exit_task
Cyclomatic Complexity 7 kernel/events/core.c:perf_event_free_task
Cyclomatic Complexity 3 kernel/events/core.c:perf_event_delayed_put
Cyclomatic Complexity 3 kernel/events/core.c:perf_event_get
Cyclomatic Complexity 2 kernel/events/core.c:perf_get_event
Cyclomatic Complexity 2 kernel/events/core.c:perf_event_attrs
Cyclomatic Complexity 3 kernel/events/core.c:perf_event_init_task
Cyclomatic Complexity 5 kernel/events/core.c:perf_swevent_init_cpu
Cyclomatic Complexity 4 kernel/events/core.c:perf_event_init_cpu
Cyclomatic Complexity 1 kernel/events/core.c:perf_event_exit_cpu
Cyclomatic Complexity 2 kernel/events/core.c:perf_reboot
Cyclomatic Complexity 3 kernel/events/core.c:perf_event_init
In file included from include/linux/kernel.h:10:0,
from include/linux/list.h:9,
from include/linux/wait.h:7,
from include/linux/wait_bit.h:8,
from include/linux/fs.h:6,
from kernel/events/core.c:12:
kernel/events/core.c: In function 'perf_swevent_init':
>> include/linux/compiler.h:339:38: error: call to '__compiletime_assert_8204' declared with attribute error: BUILD_BUG_ON failed: sizeof(_s) > sizeof(long)
_compiletime_assert(condition, msg, __compiletime_assert_, __LINE__)
^
include/linux/compiler.h:319:4: note: in definition of macro '__compiletime_assert'
prefix ## suffix(); \
^~~~~~
include/linux/compiler.h:339:2: note: in expansion of macro '_compiletime_assert'
_compiletime_assert(condition, msg, __compiletime_assert_, __LINE__)
^~~~~~~~~~~~~~~~~~~
include/linux/build_bug.h:45:37: note: in expansion of macro 'compiletime_assert'
#define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
^~~~~~~~~~~~~~~~~~
include/linux/build_bug.h:69:2: note: in expansion of macro 'BUILD_BUG_ON_MSG'
BUILD_BUG_ON_MSG(condition, "BUILD_BUG_ON failed: " #condition)
^~~~~~~~~~~~~~~~
>> include/linux/nospec.h:55:2: note: in expansion of macro 'BUILD_BUG_ON'
BUILD_BUG_ON(sizeof(_i) > sizeof(long)); \
^~~~~~~~~~~~
kernel/events/core.c:8204:14: note: in expansion of macro 'array_index_nospec'
event_id = array_index_nospec(event_id, PERF_COUNT_SW_MAX);
^~~~~~~~~~~~~~~~~~
vim +/BUILD_BUG_ON +55 include/linux/nospec.h
8fa80c503 Will Deacon 2018-02-05 34
8fa80c503 Will Deacon 2018-02-05 35 /*
f38042033 Dan Williams 2018-01-29 36 * array_index_nospec - sanitize an array index after a bounds check
f38042033 Dan Williams 2018-01-29 37 *
f38042033 Dan Williams 2018-01-29 38 * For a code sequence like:
f38042033 Dan Williams 2018-01-29 39 *
f38042033 Dan Williams 2018-01-29 40 * if (index < size) {
f38042033 Dan Williams 2018-01-29 41 * index = array_index_nospec(index, size);
f38042033 Dan Williams 2018-01-29 42 * val = array[index];
f38042033 Dan Williams 2018-01-29 43 * }
f38042033 Dan Williams 2018-01-29 44 *
f38042033 Dan Williams 2018-01-29 45 * ...if the CPU speculates past the bounds check then
f38042033 Dan Williams 2018-01-29 46 * array_index_nospec() will clamp the index within the range of [0,
f38042033 Dan Williams 2018-01-29 47 * size).
f38042033 Dan Williams 2018-01-29 48 */
f38042033 Dan Williams 2018-01-29 49 #define array_index_nospec(index, size) \
f38042033 Dan Williams 2018-01-29 50 ({ \
f38042033 Dan Williams 2018-01-29 51 typeof(index) _i = (index); \
f38042033 Dan Williams 2018-01-29 52 typeof(size) _s = (size); \
1d91c1d2c Dan Williams 2018-02-16 53 unsigned long _mask = array_index_mask_nospec(_i, _s); \
f38042033 Dan Williams 2018-01-29 54 \
f38042033 Dan Williams 2018-01-29 @55 BUILD_BUG_ON(sizeof(_i) > sizeof(long)); \
f38042033 Dan Williams 2018-01-29 56 BUILD_BUG_ON(sizeof(_s) > sizeof(long)); \
f38042033 Dan Williams 2018-01-29 57 \
b98c6a160 Rasmus Villemoes 2018-02-16 58 (typeof(_i)) (_i & _mask); \
f38042033 Dan Williams 2018-01-29 59 })
b617cfc85 Thomas Gleixner 2018-04-29 60
:::::: The code at line 55 was first introduced by commit
:::::: f3804203306e098dae9ca51540fcd5eb700d7f40 array_index_nospec: Sanitize speculative array de-references
:::::: TO: Dan Williams <dan.j.williams@...el.com>
:::::: CC: Thomas Gleixner <tglx@...utronix.de>
---
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