Re: [PATCH v2] lkdtm: Add tests for LIST_POISON and ZERO_SIZE_PTR

From: kbuild test robot
Date: Sat Dec 03 2016 - 02:24:43 EST

Hi Michael,

[auto build test ERROR on char-misc/char-misc-testing]
[also build test ERROR on v4.9-rc7]
[cannot apply to next-20161202]
[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/Michael-Ellerman/lkdtm-Add-tests-for-LIST_POISON-and-ZERO_SIZE_PTR/20161203-124958
config: blackfin-allyesconfig (attached as .config)
compiler: bfin-uclinux-gcc (GCC) 6.2.0
reproduce:
wget https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# save the attached .config to linux build tree
make.cross ARCH=blackfin

All error/warnings (new ones prefixed by >>):

In file included from include/linux/cache.h:4:0,
from include/linux/printk.h:8,
from include/linux/kernel.h:13,
from drivers/misc/lkdtm.h:6,
from drivers/misc/lkdtm_bugs.c:7:
drivers/misc/lkdtm_bugs.c: In function 'test_poison_ptr':
>> drivers/misc/lkdtm_bugs.c:160:20: error: 'CONFIG_DEFAULT_MMAP_MIN_ADDR' undeclared (first use in this function)
bias = PAGE_ALIGN(CONFIG_DEFAULT_MMAP_MIN_ADDR);
^
include/uapi/linux/kernel.h:10:41: note: in definition of macro '__ALIGN_KERNEL_MASK'
#define __ALIGN_KERNEL_MASK(x, mask) (((x) + (mask)) & ~(mask))
^
>> include/linux/kernel.h:48:22: note: in expansion of macro '__ALIGN_KERNEL'
#define ALIGN(x, a) __ALIGN_KERNEL((x), (a))
^~~~~~~~~~~~~~
>> include/linux/mm.h:126:26: note: in expansion of macro 'ALIGN'
#define PAGE_ALIGN(addr) ALIGN(addr, PAGE_SIZE)
^~~~~
>> drivers/misc/lkdtm_bugs.c:160:9: note: in expansion of macro 'PAGE_ALIGN'
bias = PAGE_ALIGN(CONFIG_DEFAULT_MMAP_MIN_ADDR);
^~~~~~~~~~
drivers/misc/lkdtm_bugs.c:160:20: note: each undeclared identifier is reported only once for each function it appears in
bias = PAGE_ALIGN(CONFIG_DEFAULT_MMAP_MIN_ADDR);
^
include/uapi/linux/kernel.h:10:41: note: in definition of macro '__ALIGN_KERNEL_MASK'
#define __ALIGN_KERNEL_MASK(x, mask) (((x) + (mask)) & ~(mask))
^
>> include/linux/kernel.h:48:22: note: in expansion of macro '__ALIGN_KERNEL'
#define ALIGN(x, a) __ALIGN_KERNEL((x), (a))
^~~~~~~~~~~~~~
>> include/linux/mm.h:126:26: note: in expansion of macro 'ALIGN'
#define PAGE_ALIGN(addr) ALIGN(addr, PAGE_SIZE)
^~~~~
>> drivers/misc/lkdtm_bugs.c:160:9: note: in expansion of macro 'PAGE_ALIGN'
bias = PAGE_ALIGN(CONFIG_DEFAULT_MMAP_MIN_ADDR);
^~~~~~~~~~

vim +/CONFIG_DEFAULT_MMAP_MIN_ADDR +160 drivers/misc/lkdtm_bugs.c

1 /*
2 * This is for all the tests related to logic bugs (e.g. bad dereferences,
3 * bad alignment, bad loops, bad locking, bad scheduling, deep stacks, and
4 * lockups) along with other things that don't fit well into existing LKDTM
5 * test source files.
6 */
> 7 #include "lkdtm.h"
8 #include <linux/mman.h>
9 #include <linux/sched.h>
10 #include <linux/security.h>
11 #include <linux/slab.h>
12
13 /*
14 * Make sure our attempts to over run the kernel stack doesn't trigger
15 * a compiler warning when CONFIG_FRAME_WARN is set. Then make sure we
16 * recurse past the end of THREAD_SIZE by default.
17 */
18 #if defined(CONFIG_FRAME_WARN) && (CONFIG_FRAME_WARN > 0)
19 #define REC_STACK_SIZE (CONFIG_FRAME_WARN / 2)
20 #else
21 #define REC_STACK_SIZE (THREAD_SIZE / 8)
22 #endif
23 #define REC_NUM_DEFAULT ((THREAD_SIZE / REC_STACK_SIZE) * 2)
24
25 static int recur_count = REC_NUM_DEFAULT;
26
27 static DEFINE_SPINLOCK(lock_me_up);
28
29 static int recursive_loop(int remaining)
30 {
31 char buf[REC_STACK_SIZE];
32
33 /* Make sure compiler does not optimize this away. */
34 memset(buf, (remaining & 0xff) | 0x1, REC_STACK_SIZE);
35 if (!remaining)
36 return 0;
37 else
38 return recursive_loop(remaining - 1);
39 }
40
41 /* If the depth is negative, use the default, otherwise keep parameter. */
42 void __init lkdtm_bugs_init(int *recur_param)
43 {
44 if (*recur_param < 0)
45 *recur_param = recur_count;
46 else
47 recur_count = *recur_param;
48 }
49
50 void lkdtm_PANIC(void)
51 {
52 panic("dumptest");
53 }
54
55 void lkdtm_BUG(void)
56 {
57 BUG();
58 }
59
60 void lkdtm_WARNING(void)
61 {
62 WARN_ON(1);
63 }
64
65 void lkdtm_EXCEPTION(void)
66 {
67 *((int *) 0) = 0;
68 }
69
70 void lkdtm_LOOP(void)
71 {
72 for (;;)
73 ;
74 }
75
76 void lkdtm_OVERFLOW(void)
77 {
78 (void) recursive_loop(recur_count);
79 }
80
81 noinline void lkdtm_CORRUPT_STACK(void)
82 {
83 /* Use default char array length that triggers stack protection. */
84 char data[8];
85
86 memset((void *)data, 'a', 64);
87 pr_info("Corrupted stack with '%16s'...\n", data);
88 }
89
90 void lkdtm_UNALIGNED_LOAD_STORE_WRITE(void)
91 {
92 static u8 data[5] __attribute__((aligned(4))) = {1, 2, 3, 4, 5};
93 u32 *p;
94 u32 val = 0x12345678;
95
96 p = (u32 *)(data + 1);
97 if (*p == 0)
98 val = 0x87654321;
99 *p = val;
100 }
101
102 void lkdtm_SOFTLOCKUP(void)
103 {
104 preempt_disable();
105 for (;;)
106 cpu_relax();
107 }
108
109 void lkdtm_HARDLOCKUP(void)
110 {
111 local_irq_disable();
112 for (;;)
113 cpu_relax();
114 }
115
116 void lkdtm_SPINLOCKUP(void)
117 {
118 /* Must be called twice to trigger. */
119 spin_lock(&lock_me_up);
120 /* Let sparse know we intended to exit holding the lock. */
121 __release(&lock_me_up);
122 }
123
124 void lkdtm_HUNG_TASK(void)
125 {
126 set_current_state(TASK_UNINTERRUPTIBLE);
127 schedule();
128 }
129
130 void lkdtm_ATOMIC_UNDERFLOW(void)
131 {
132 atomic_t under = ATOMIC_INIT(INT_MIN);
133
134 pr_info("attempting good atomic increment\n");
135 atomic_inc(&under);
136 atomic_dec(&under);
137
138 pr_info("attempting bad atomic underflow\n");
139 atomic_dec(&under);
140 }
141
142 void lkdtm_ATOMIC_OVERFLOW(void)
143 {
144 atomic_t over = ATOMIC_INIT(INT_MAX);
145
146 pr_info("attempting good atomic decrement\n");
147 atomic_dec(&over);
148 atomic_inc(&over);
149
150 pr_info("attempting bad atomic overflow\n");
151 atomic_inc(&over);
152 }
153
154 static void test_poison_ptr(void *base, const char *desc)
155 {
156 unsigned int *ptr, bias, val;
157 unsigned long uaddr;
158
159 /* We'd rather not export mmap_min_addr, so use the default instead */
> 160 bias = PAGE_ALIGN(CONFIG_DEFAULT_MMAP_MIN_ADDR);
161
162 uaddr = vm_mmap(NULL, bias, PAGE_SIZE, PROT_READ | PROT_WRITE,
163 MAP_ANONYMOUS | MAP_PRIVATE | MAP_FIXED, 0);

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