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Message-ID: <201803030033.qwnGJuxP%fengguang.wu@intel.com>
Date: Sat, 3 Mar 2018 00:47:07 +0800
From: kbuild test robot <lkp@...el.com>
To: Igor Stoppa <igor.stoppa@...wei.com>
Cc: kbuild-all@...org, david@...morbit.com, willy@...radead.org,
keescook@...omium.org, mhocko@...nel.org, labbott@...hat.com,
linux-security-module@...r.kernel.org, linux-mm@...ck.org,
linux-kernel@...r.kernel.org, kernel-hardening@...ts.openwall.com,
Igor Stoppa <igor.stoppa@...wei.com>
Subject: Re: [PATCH 1/7] genalloc: track beginning of allocations
Hi Igor,
Thank you for the patch! Perhaps something to improve:
[auto build test WARNING on next-20180223]
[also build test WARNING on v4.16-rc3]
[cannot apply to linus/master mmotm/master char-misc/char-misc-testing v4.16-rc3 v4.16-rc2 v4.16-rc1]
[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/Igor-Stoppa/mm-security-ro-protection-for-dynamic-data/20180302-232215
config: i386-randconfig-x007-201808 (attached as .config)
compiler: gcc-7 (Debian 7.3.0-1) 7.3.0
reproduce:
# save the attached .config to linux build tree
make ARCH=i386
All warnings (new ones prefixed by >>):
In file included from arch/x86/include/asm/bug.h:83:0,
from include/linux/bug.h:5,
from include/linux/mmdebug.h:5,
from include/linux/gfp.h:5,
from include/linux/slab.h:15,
from lib/genalloc.c:99:
lib/genalloc.c: In function 'gen_pool_free':
lib/genalloc.c:616:10: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'struct gen_pool *' [-Wformat=]
"Trying to free unallocated memory"
^
include/asm-generic/bug.h:98:50: note: in definition of macro '__WARN_printf'
#define __WARN_printf(arg...) do { __warn_printk(arg); __WARN(); } while (0)
^~~
lib/genalloc.c:615:5: note: in expansion of macro 'WARN'
WARN(true,
^~~~
lib/genalloc.c:617:23: note: format string is defined here
" from pool %s", pool);
~^
In file included from include/asm-generic/bug.h:5:0,
from arch/x86/include/asm/bug.h:83,
from include/linux/bug.h:5,
from include/linux/mmdebug.h:5,
from include/linux/gfp.h:5,
from include/linux/slab.h:15,
from lib/genalloc.c:99:
lib/genalloc.c:624:17: error: implicit declaration of function 'exit_test'; did you mean 'exit_sem'? [-Werror=implicit-function-declaration]
if (unlikely(exit_test(boundary < 0))) {
^
include/linux/compiler.h:58:30: note: in definition of macro '__trace_if'
if (__builtin_constant_p(!!(cond)) ? !!(cond) : \
^~~~
>> lib/genalloc.c:624:4: note: in expansion of macro 'if'
if (unlikely(exit_test(boundary < 0))) {
^~
include/linux/compiler.h:48:24: note: in expansion of macro '__branch_check__'
# define unlikely(x) (__branch_check__(x, 0, __builtin_constant_p(x)))
^~~~~~~~~~~~~~~~
>> lib/genalloc.c:624:8: note: in expansion of macro 'unlikely'
if (unlikely(exit_test(boundary < 0))) {
^~~~~~~~
In file included from arch/x86/include/asm/bug.h:83:0,
from include/linux/bug.h:5,
from include/linux/mmdebug.h:5,
from include/linux/gfp.h:5,
from include/linux/slab.h:15,
from lib/genalloc.c:99:
lib/genalloc.c:626:16: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'struct gen_pool *' [-Wformat=]
WARN(true, "Corrupted pool %s", pool);
^
include/asm-generic/bug.h:98:50: note: in definition of macro '__WARN_printf'
#define __WARN_printf(arg...) do { __warn_printk(arg); __WARN(); } while (0)
^~~
lib/genalloc.c:626:5: note: in expansion of macro 'WARN'
WARN(true, "Corrupted pool %s", pool);
^~~~
lib/genalloc.c:634:10: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'struct gen_pool *' [-Wformat=]
"Size provided differs from size "
^
include/asm-generic/bug.h:98:50: note: in definition of macro '__WARN_printf'
#define __WARN_printf(arg...) do { __warn_printk(arg); __WARN(); } while (0)
^~~
lib/genalloc.c:633:5: note: in expansion of macro 'WARN'
WARN(true,
^~~~
lib/genalloc.c:635:31: note: format string is defined here
"measured from pool %s", pool);
~^
In file included from arch/x86/include/asm/bug.h:83:0,
from include/linux/bug.h:5,
from include/linux/mmdebug.h:5,
from include/linux/gfp.h:5,
from include/linux/slab.h:15,
from lib/genalloc.c:99:
lib/genalloc.c:643:10: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'struct gen_pool *' [-Wformat=]
"Unexpected bitmap collision while"
^
include/asm-generic/bug.h:98:50: note: in definition of macro '__WARN_printf'
#define __WARN_printf(arg...) do { __warn_printk(arg); __WARN(); } while (0)
^~~
lib/genalloc.c:642:5: note: in expansion of macro 'WARN'
WARN(true,
^~~~
lib/genalloc.c:644:36: note: format string is defined here
" freeing memory in pool %s", pool);
~^
cc1: some warnings being treated as errors
vim +/if +624 lib/genalloc.c
609
610 rcu_read_lock();
611 list_for_each_entry_rcu(chunk, &pool->chunks, next_chunk) {
612 if (addr >= chunk->start_addr && addr <= chunk->end_addr) {
613 if (unlikely(addr + size - 1 > chunk->end_addr)) {
614 rcu_read_unlock();
615 WARN(true,
616 "Trying to free unallocated memory"
617 " from pool %s", pool);
618 return;
619 }
620 start_entry = (addr - chunk->start_addr) >> order;
621 remaining_entries = (chunk->end_addr - addr) >> order;
622 boundary = get_boundary(chunk->entries, start_entry,
623 remaining_entries);
> 624 if (unlikely(exit_test(boundary < 0))) {
625 rcu_read_unlock();
626 WARN(true, "Corrupted pool %s", pool);
627 return;
628 }
629 nentries = boundary - start_entry;
630 if (unlikely(size && (nentries !=
631 mem_to_units(size, order)))) {
632 rcu_read_unlock();
633 WARN(true,
634 "Size provided differs from size "
635 "measured from pool %s", pool);
636 return;
637 }
638 remain = alter_bitmap_ll(CLEAR_BITS, chunk->entries,
639 start_entry, nentries);
640 if (unlikely(remain)) {
641 rcu_read_unlock();
642 WARN(true,
643 "Unexpected bitmap collision while"
644 " freeing memory in pool %s", pool);
645 return;
646 }
647 atomic_long_add(nentries << order, &chunk->avail);
648 rcu_read_unlock();
649 return;
650 }
651 }
652 rcu_read_unlock();
653 WARN(true, "address not found in pool %s", pool->name);
654 }
655 EXPORT_SYMBOL(gen_pool_free);
656
---
0-DAY kernel test infrastructure Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all Intel Corporation
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