[PATCH v2 2/5] crash_dump: save the dm crypt key temporarily
kernel test robot
lkp at intel.com
Sat Jan 13 09:07:03 PST 2024
Hi Coiby,
kernel test robot noticed the following build errors:
[auto build test ERROR on tip/x86/core]
[also build test ERROR on v6.7]
[cannot apply to linus/master next-20240112]
[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/Coiby-Xu/kexec_file-allow-to-place-kexec_buf-randomly/20240110-151859
base: tip/x86/core
patch link: https://lore.kernel.org/r/20240110071522.1308935-3-coxu%40redhat.com
patch subject: [PATCH v2 2/5] crash_dump: save the dm crypt key temporarily
config: i386-buildonly-randconfig-003-20240113 (https://download.01.org/0day-ci/archive/20240114/202401140034.Sh6fQaK6-lkp@intel.com/config)
compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240114/202401140034.Sh6fQaK6-lkp@intel.com/reproduce)
If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp at intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202401140034.Sh6fQaK6-lkp@intel.com/
All error/warnings (new ones prefixed by >>):
>> kernel/crash_dump_dm_crypt.c:8:6: warning: no previous prototype for 'wipe_dm_crypt_key' [-Wmissing-prototypes]
8 | void wipe_dm_crypt_key(void)
| ^~~~~~~~~~~~~~~~~
kernel/crash_dump_dm_crypt.c: In function 'crash_load_dm_crypt_key':
>> kernel/crash_dump_dm_crypt.c:94:16: error: variable 'kbuf' has initializer but incomplete type
94 | struct kexec_buf kbuf = {
| ^~~~~~~~~
>> kernel/crash_dump_dm_crypt.c:95:18: error: 'struct kexec_buf' has no member named 'image'
95 | .image = image,
| ^~~~~
>> kernel/crash_dump_dm_crypt.c:95:26: warning: excess elements in struct initializer
95 | .image = image,
| ^~~~~
kernel/crash_dump_dm_crypt.c:95:26: note: (near initialization for 'kbuf')
>> kernel/crash_dump_dm_crypt.c:96:18: error: 'struct kexec_buf' has no member named 'buf_min'
96 | .buf_min = 0,
| ^~~~~~~
kernel/crash_dump_dm_crypt.c:96:28: warning: excess elements in struct initializer
96 | .buf_min = 0,
| ^
kernel/crash_dump_dm_crypt.c:96:28: note: (near initialization for 'kbuf')
>> kernel/crash_dump_dm_crypt.c:97:18: error: 'struct kexec_buf' has no member named 'buf_max'
97 | .buf_max = ULONG_MAX,
| ^~~~~~~
In file included from include/linux/limits.h:7,
from include/linux/kernel.h:17,
from arch/x86/include/asm/percpu.h:27,
from arch/x86/include/asm/nospec-branch.h:14,
from arch/x86/include/asm/irqflags.h:9,
from include/linux/irqflags.h:17,
from include/linux/rcupdate.h:26,
from include/linux/rbtree.h:24,
from include/linux/key.h:15,
from include/keys/user-type.h:11,
from kernel/crash_dump_dm_crypt.c:2:
>> include/vdso/limits.h:13:25: warning: excess elements in struct initializer
13 | #define ULONG_MAX (~0UL)
| ^
kernel/crash_dump_dm_crypt.c:97:28: note: in expansion of macro 'ULONG_MAX'
97 | .buf_max = ULONG_MAX,
| ^~~~~~~~~
include/vdso/limits.h:13:25: note: (near initialization for 'kbuf')
13 | #define ULONG_MAX (~0UL)
| ^
kernel/crash_dump_dm_crypt.c:97:28: note: in expansion of macro 'ULONG_MAX'
97 | .buf_max = ULONG_MAX,
| ^~~~~~~~~
>> kernel/crash_dump_dm_crypt.c:98:18: error: 'struct kexec_buf' has no member named 'top_down'
98 | .top_down = false,
| ^~~~~~~~
kernel/crash_dump_dm_crypt.c:98:29: warning: excess elements in struct initializer
98 | .top_down = false,
| ^~~~~
kernel/crash_dump_dm_crypt.c:98:29: note: (near initialization for 'kbuf')
>> kernel/crash_dump_dm_crypt.c:99:18: error: 'struct kexec_buf' has no member named 'random'
99 | .random = true,
| ^~~~~~
kernel/crash_dump_dm_crypt.c:99:27: warning: excess elements in struct initializer
99 | .random = true,
| ^~~~
kernel/crash_dump_dm_crypt.c:99:27: note: (near initialization for 'kbuf')
>> kernel/crash_dump_dm_crypt.c:94:26: error: storage size of 'kbuf' isn't known
94 | struct kexec_buf kbuf = {
| ^~~~
>> kernel/crash_dump_dm_crypt.c:109:20: error: 'KEXEC_BUF_MEM_UNKNOWN' undeclared (first use in this function)
109 | kbuf.mem = KEXEC_BUF_MEM_UNKNOWN;
| ^~~~~~~~~~~~~~~~~~~~~
kernel/crash_dump_dm_crypt.c:109:20: note: each undeclared identifier is reported only once for each function it appears in
>> kernel/crash_dump_dm_crypt.c:110:15: error: implicit declaration of function 'kexec_add_buffer' [-Werror=implicit-function-declaration]
110 | ret = kexec_add_buffer(&kbuf);
| ^~~~~~~~~~~~~~~~
>> kernel/crash_dump_dm_crypt.c:94:26: warning: unused variable 'kbuf' [-Wunused-variable]
94 | struct kexec_buf kbuf = {
| ^~~~
cc1: some warnings being treated as errors
vim +/kbuf +94 kernel/crash_dump_dm_crypt.c
7
> 8 void wipe_dm_crypt_key(void)
9 {
10 if (dm_crypt_key) {
11 memset(dm_crypt_key, 0, dm_crypt_key_size * sizeof(u8));
12 kfree(dm_crypt_key);
13 dm_crypt_key = NULL;
14 }
15 }
16
17 static void _wipe_dm_crypt_key(struct work_struct *dummy)
18 {
19 wipe_dm_crypt_key();
20 }
21
22 static DECLARE_DELAYED_WORK(wipe_dm_crypt_key_work, _wipe_dm_crypt_key);
23
24 static unsigned __read_mostly wipe_key_delay = 120; /* 2 mins */
25
26 static int crash_save_temp_dm_crypt_key(const char *key_desc, size_t count)
27 {
28 const struct user_key_payload *ukp;
29 struct key *key;
30
31 if (dm_crypt_key) {
32 memset(dm_crypt_key, 0, dm_crypt_key_size * sizeof(u8));
33 kfree(dm_crypt_key);
34 }
35
36 pr_debug("Requesting key %s", key_desc);
37 key = request_key(&key_type_user, key_desc, NULL);
38
39 if (IS_ERR(key)) {
40 pr_debug("No such key %s", key_desc);
41 return PTR_ERR(key);
42 }
43
44 ukp = user_key_payload_locked(key);
45 if (!ukp)
46 return -EKEYREVOKED;
47
48 dm_crypt_key = kmalloc(ukp->datalen, GFP_KERNEL);
49 if (!dm_crypt_key)
50 return -ENOMEM;
51 memcpy(dm_crypt_key, ukp->data, ukp->datalen);
52 dm_crypt_key_size = ukp->datalen;
53 pr_debug("dm crypt key (size=%u): %8ph\n", dm_crypt_key_size, dm_crypt_key);
54 schedule_delayed_work(&wipe_dm_crypt_key_work,
55 round_jiffies_relative(wipe_key_delay * HZ));
56 return 0;
57 }
58
59 int crash_sysfs_dm_crypt_key_write(const char *key_desc, size_t count)
60 {
61 if (!is_kdump_kernel())
62 return crash_save_temp_dm_crypt_key(key_desc, count);
63 return -EINVAL;
64 }
65 EXPORT_SYMBOL(crash_sysfs_dm_crypt_key_write);
66
67 int crash_pass_temp_dm_crypt_key(void **addr, unsigned long *sz)
68 {
69 unsigned long dm_crypt_key_sz;
70 unsigned char *buf;
71 unsigned int *size_ptr;
72
73 if (!dm_crypt_key)
74 return -EINVAL;
75
76 dm_crypt_key_sz = sizeof(unsigned int) + dm_crypt_key_size * sizeof(u8);
77
78 buf = vzalloc(dm_crypt_key_sz);
79 if (!buf)
80 return -ENOMEM;
81
82 size_ptr = (unsigned int *)buf;
83 memcpy(size_ptr, &dm_crypt_key_size, sizeof(unsigned int));
84 memcpy(size_ptr + 1, dm_crypt_key, dm_crypt_key_size * sizeof(u8));
85 *addr = buf;
86 *sz = dm_crypt_key_sz;
87 wipe_dm_crypt_key();
88 return 0;
89 }
90
91 int crash_load_dm_crypt_key(struct kimage *image)
92 {
93 int ret;
> 94 struct kexec_buf kbuf = {
> 95 .image = image,
> 96 .buf_min = 0,
> 97 .buf_max = ULONG_MAX,
> 98 .top_down = false,
> 99 .random = true,
100 };
101
102 image->dm_crypt_key_addr = 0;
103 ret = crash_pass_temp_dm_crypt_key(&kbuf.buffer, &kbuf.bufsz);
104 if (ret)
105 return ret;
106
107 kbuf.memsz = kbuf.bufsz;
108 kbuf.buf_align = ELF_CORE_HEADER_ALIGN;
> 109 kbuf.mem = KEXEC_BUF_MEM_UNKNOWN;
> 110 ret = kexec_add_buffer(&kbuf);
--
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