* Re: [PATCH] x86: profiling: Set prof_cpu_mask to NULL after free
[not found] <20230224084945.134038-1-chenzhongjin@huawei.com>
@ 2023-02-24 22:16 ` kernel test robot
2023-02-25 9:43 ` Chen Zhongjin
0 siblings, 1 reply; 2+ messages in thread
From: kernel test robot @ 2023-02-24 22:16 UTC (permalink / raw)
To: Chen Zhongjin, linux-kernel
Cc: llvm, oe-kbuild-all, chenzhongjin, akpm, wuchi.zero, ben-linux,
rusty
Hi Chen,
Thank you for the patch! Yet something to improve:
[auto build test ERROR on linus/master]
[also build test ERROR on v6.2 next-20230224]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]
url: https://github.com/intel-lab-lkp/linux/commits/Chen-Zhongjin/x86-profiling-Set-prof_cpu_mask-to-NULL-after-free/20230224-165419
patch link: https://lore.kernel.org/r/20230224084945.134038-1-chenzhongjin%40huawei.com
patch subject: [PATCH] x86: profiling: Set prof_cpu_mask to NULL after free
config: arm-randconfig-r004-20230222 (https://download.01.org/0day-ci/archive/20230225/202302250609.vmze90DB-lkp@intel.com/config)
compiler: clang version 17.0.0 (https://github.com/llvm/llvm-project db89896bbbd2251fff457699635acbbedeead27f)
reproduce (this is a W=1 build):
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# install arm cross compiling tool for clang build
# apt-get install binutils-arm-linux-gnueabi
# https://github.com/intel-lab-lkp/linux/commit/ed9b4879e816862f4f6210b1c429bcbebac6d317
git remote add linux-review https://github.com/intel-lab-lkp/linux
git fetch --no-tags linux-review Chen-Zhongjin/x86-profiling-Set-prof_cpu_mask-to-NULL-after-free/20230224-165419
git checkout ed9b4879e816862f4f6210b1c429bcbebac6d317
# save the config file
mkdir build_dir && cp config build_dir/.config
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm olddefconfig
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm SHELL=/bin/bash
If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@intel.com>
| Link: https://lore.kernel.org/oe-kbuild-all/202302250609.vmze90DB-lkp@intel.com/
All errors (new ones prefixed by >>):
>> kernel/profile.c:136:16: error: array type 'cpumask_var_t' (aka 'struct cpumask[1]') is not assignable
prof_cpu_mask = NULL;
~~~~~~~~~~~~~ ^
1 error generated.
vim +136 kernel/profile.c
98
99
100 int __ref profile_init(void)
101 {
102 int buffer_bytes;
103 if (!prof_on)
104 return 0;
105
106 /* only text is profiled */
107 prof_len = (_etext - _stext) >> prof_shift;
108
109 if (!prof_len) {
110 pr_warn("profiling shift: %u too large\n", prof_shift);
111 prof_on = 0;
112 return -EINVAL;
113 }
114
115 buffer_bytes = prof_len*sizeof(atomic_t);
116
117 if (!alloc_cpumask_var(&prof_cpu_mask, GFP_KERNEL))
118 return -ENOMEM;
119
120 cpumask_copy(prof_cpu_mask, cpu_possible_mask);
121
122 prof_buffer = kzalloc(buffer_bytes, GFP_KERNEL|__GFP_NOWARN);
123 if (prof_buffer)
124 return 0;
125
126 prof_buffer = alloc_pages_exact(buffer_bytes,
127 GFP_KERNEL|__GFP_ZERO|__GFP_NOWARN);
128 if (prof_buffer)
129 return 0;
130
131 prof_buffer = vzalloc(buffer_bytes);
132 if (prof_buffer)
133 return 0;
134
135 free_cpumask_var(prof_cpu_mask);
> 136 prof_cpu_mask = NULL;
137 return -ENOMEM;
138 }
139
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [PATCH] x86: profiling: Set prof_cpu_mask to NULL after free
2023-02-24 22:16 ` [PATCH] x86: profiling: Set prof_cpu_mask to NULL after free kernel test robot
@ 2023-02-25 9:43 ` Chen Zhongjin
0 siblings, 0 replies; 2+ messages in thread
From: Chen Zhongjin @ 2023-02-25 9:43 UTC (permalink / raw)
To: kernel test robot, linux-kernel
Cc: llvm, oe-kbuild-all, akpm, wuchi.zero, ben-linux, rusty
prof_cpu_mask can't be set to NULL when CONFIG_CPUMASK_OFFSTACK=n,
because it is an array.
But checking prof_buffer still can prevent prof_cpu_mask be used in
profile_tick() and fix this problem.
Will push another version for this.
On 2023/2/25 6:16, kernel test robot wrote:
> Hi Chen,
>
> Thank you for the patch! Yet something to improve:
>
> [auto build test ERROR on linus/master]
> [also build test ERROR on v6.2 next-20230224]
> [If your patch is applied to the wrong git tree, kindly drop us a note.
> And when submitting patch, we suggest to use '--base' as documented in
> https://git-scm.com/docs/git-format-patch#_base_tree_information]
>
> url: https://github.com/intel-lab-lkp/linux/commits/Chen-Zhongjin/x86-profiling-Set-prof_cpu_mask-to-NULL-after-free/20230224-165419
> patch link: https://lore.kernel.org/r/20230224084945.134038-1-chenzhongjin%40huawei.com
> patch subject: [PATCH] x86: profiling: Set prof_cpu_mask to NULL after free
> config: arm-randconfig-r004-20230222 (https://download.01.org/0day-ci/archive/20230225/202302250609.vmze90DB-lkp@intel.com/config)
> compiler: clang version 17.0.0 (https://github.com/llvm/llvm-project db89896bbbd2251fff457699635acbbedeead27f)
> reproduce (this is a W=1 build):
> wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
> chmod +x ~/bin/make.cross
> # install arm cross compiling tool for clang build
> # apt-get install binutils-arm-linux-gnueabi
> # https://github.com/intel-lab-lkp/linux/commit/ed9b4879e816862f4f6210b1c429bcbebac6d317
> git remote add linux-review https://github.com/intel-lab-lkp/linux
> git fetch --no-tags linux-review Chen-Zhongjin/x86-profiling-Set-prof_cpu_mask-to-NULL-after-free/20230224-165419
> git checkout ed9b4879e816862f4f6210b1c429bcbebac6d317
> # save the config file
> mkdir build_dir && cp config build_dir/.config
> COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm olddefconfig
> COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm SHELL=/bin/bash
>
> If you fix the issue, kindly add following tag where applicable
> | Reported-by: kernel test robot <lkp@intel.com>
> | Link: https://lore.kernel.org/oe-kbuild-all/202302250609.vmze90DB-lkp@intel.com/
>
> All errors (new ones prefixed by >>):
>
>>> kernel/profile.c:136:16: error: array type 'cpumask_var_t' (aka 'struct cpumask[1]') is not assignable
> prof_cpu_mask = NULL;
> ~~~~~~~~~~~~~ ^
> 1 error generated.
>
>
> vim +136 kernel/profile.c
>
> 98
> 99
> 100 int __ref profile_init(void)
> 101 {
> 102 int buffer_bytes;
> 103 if (!prof_on)
> 104 return 0;
> 105
> 106 /* only text is profiled */
> 107 prof_len = (_etext - _stext) >> prof_shift;
> 108
> 109 if (!prof_len) {
> 110 pr_warn("profiling shift: %u too large\n", prof_shift);
> 111 prof_on = 0;
> 112 return -EINVAL;
> 113 }
> 114
> 115 buffer_bytes = prof_len*sizeof(atomic_t);
> 116
> 117 if (!alloc_cpumask_var(&prof_cpu_mask, GFP_KERNEL))
> 118 return -ENOMEM;
> 119
> 120 cpumask_copy(prof_cpu_mask, cpu_possible_mask);
> 121
> 122 prof_buffer = kzalloc(buffer_bytes, GFP_KERNEL|__GFP_NOWARN);
> 123 if (prof_buffer)
> 124 return 0;
> 125
> 126 prof_buffer = alloc_pages_exact(buffer_bytes,
> 127 GFP_KERNEL|__GFP_ZERO|__GFP_NOWARN);
> 128 if (prof_buffer)
> 129 return 0;
> 130
> 131 prof_buffer = vzalloc(buffer_bytes);
> 132 if (prof_buffer)
> 133 return 0;
> 134
> 135 free_cpumask_var(prof_cpu_mask);
> > 136 prof_cpu_mask = NULL;
> 137 return -ENOMEM;
> 138 }
> 139
>
^ permalink raw reply [flat|nested] 2+ messages in thread
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[not found] <20230224084945.134038-1-chenzhongjin@huawei.com>
2023-02-24 22:16 ` [PATCH] x86: profiling: Set prof_cpu_mask to NULL after free kernel test robot
2023-02-25 9:43 ` Chen Zhongjin
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