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Message-ID: <202501112024.fU1FgDDE-lkp@intel.com>
Date: Sat, 11 Jan 2025 20:24:09 +0800
From: kernel test robot <lkp@...el.com>
To: Charles Han <hanchunchao@...pur.com>, kees@...nel.org,
joel.granados@...nel.org, logang@...tatee.com, mcgrof@...nel.org,
yzaikin@...gle.com, gregkh@...uxfoundation.org,
brendan.higgins@...ux.dev
Cc: oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org,
linux-fsdevel@...r.kernel.org, Charles Han <hanchunchao@...pur.com>
Subject: Re: [PATCH] kernel/sysctl-test: Fix potential null dereference in
sysctl-test
Hi Charles,
kernel test robot noticed the following build warnings:
[auto build test WARNING on linus/master]
[also build test WARNING on mcgrof/sysctl-next sysctl/sysctl-next v6.13-rc6 next-20250110]
[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/Charles-Han/kernel-sysctl-test-Fix-potential-null-dereference-in-sysctl-test/20250110-181004
base: linus/master
patch link: https://lore.kernel.org/r/20250110100748.63470-1-hanchunchao%40inspur.com
patch subject: [PATCH] kernel/sysctl-test: Fix potential null dereference in sysctl-test
config: i386-randconfig-063-20250111 (https://download.01.org/0day-ci/archive/20250111/202501112024.fU1FgDDE-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/20250111/202501112024.fU1FgDDE-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@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202501112024.fU1FgDDE-lkp@intel.com/
sparse warnings: (new ones prefixed by >>)
>> kernel/sysctl-test.c:38:9: sparse: sparse: incorrect type in initializer (different address spaces) @@ expected void const *value @@ got void [noderef] __user *const __ptr @@
kernel/sysctl-test.c:38:9: sparse: expected void const *value
kernel/sysctl-test.c:38:9: sparse: got void [noderef] __user *const __ptr
kernel/sysctl-test.c:47:9: sparse: sparse: incorrect type in argument 3 (different address spaces) @@ expected void * @@ got void [noderef] __user *buffer @@
kernel/sysctl-test.c:47:9: sparse: expected void *
kernel/sysctl-test.c:47:9: sparse: got void [noderef] __user *buffer
kernel/sysctl-test.c:47:9: sparse: sparse: incorrect type in argument 3 (different address spaces) @@ expected void * @@ got void [noderef] __user *buffer @@
kernel/sysctl-test.c:47:9: sparse: expected void *
kernel/sysctl-test.c:47:9: sparse: got void [noderef] __user *buffer
kernel/sysctl-test.c:56:9: sparse: sparse: incorrect type in argument 3 (different address spaces) @@ expected void * @@ got void [noderef] __user *buffer @@
kernel/sysctl-test.c:56:9: sparse: expected void *
kernel/sysctl-test.c:56:9: sparse: got void [noderef] __user *buffer
kernel/sysctl-test.c:56:9: sparse: sparse: incorrect type in argument 3 (different address spaces) @@ expected void * @@ got void [noderef] __user *buffer @@
kernel/sysctl-test.c:56:9: sparse: expected void *
kernel/sysctl-test.c:56:9: sparse: got void [noderef] __user *buffer
kernel/sysctl-test.c:85:9: sparse: sparse: incorrect type in initializer (different address spaces) @@ expected void const *value @@ got void [noderef] __user *const __ptr @@
kernel/sysctl-test.c:85:9: sparse: expected void const *value
kernel/sysctl-test.c:85:9: sparse: got void [noderef] __user *const __ptr
kernel/sysctl-test.c:94:9: sparse: sparse: incorrect type in argument 3 (different address spaces) @@ expected void * @@ got void [noderef] __user *buffer @@
kernel/sysctl-test.c:94:9: sparse: expected void *
kernel/sysctl-test.c:94:9: sparse: got void [noderef] __user *buffer
kernel/sysctl-test.c:94:9: sparse: sparse: incorrect type in argument 3 (different address spaces) @@ expected void * @@ got void [noderef] __user *buffer @@
kernel/sysctl-test.c:94:9: sparse: expected void *
kernel/sysctl-test.c:94:9: sparse: got void [noderef] __user *buffer
kernel/sysctl-test.c:103:9: sparse: sparse: incorrect type in argument 3 (different address spaces) @@ expected void * @@ got void [noderef] __user *buffer @@
kernel/sysctl-test.c:103:9: sparse: expected void *
kernel/sysctl-test.c:103:9: sparse: got void [noderef] __user *buffer
kernel/sysctl-test.c:103:9: sparse: sparse: incorrect type in argument 3 (different address spaces) @@ expected void * @@ got void [noderef] __user *buffer @@
kernel/sysctl-test.c:103:9: sparse: expected void *
kernel/sysctl-test.c:103:9: sparse: got void [noderef] __user *buffer
kernel/sysctl-test.c:129:9: sparse: sparse: incorrect type in initializer (different address spaces) @@ expected void const *value @@ got void [noderef] __user *const __ptr @@
kernel/sysctl-test.c:129:9: sparse: expected void const *value
kernel/sysctl-test.c:129:9: sparse: got void [noderef] __user *const __ptr
kernel/sysctl-test.c:136:9: sparse: sparse: incorrect type in argument 3 (different address spaces) @@ expected void * @@ got void [noderef] __user *buffer @@
kernel/sysctl-test.c:136:9: sparse: expected void *
kernel/sysctl-test.c:136:9: sparse: got void [noderef] __user *buffer
kernel/sysctl-test.c:136:9: sparse: sparse: incorrect type in argument 3 (different address spaces) @@ expected void * @@ got void [noderef] __user *buffer @@
kernel/sysctl-test.c:136:9: sparse: expected void *
kernel/sysctl-test.c:136:9: sparse: got void [noderef] __user *buffer
kernel/sysctl-test.c:140:9: sparse: sparse: incorrect type in argument 3 (different address spaces) @@ expected void * @@ got void [noderef] __user *buffer @@
kernel/sysctl-test.c:140:9: sparse: expected void *
kernel/sysctl-test.c:140:9: sparse: got void [noderef] __user *buffer
kernel/sysctl-test.c:140:9: sparse: sparse: incorrect type in argument 3 (different address spaces) @@ expected void * @@ got void [noderef] __user *buffer @@
kernel/sysctl-test.c:140:9: sparse: expected void *
kernel/sysctl-test.c:140:9: sparse: got void [noderef] __user *buffer
kernel/sysctl-test.c:164:9: sparse: sparse: incorrect type in initializer (different address spaces) @@ expected void const *value @@ got void [noderef] __user *const __ptr @@
kernel/sysctl-test.c:164:9: sparse: expected void const *value
kernel/sysctl-test.c:164:9: sparse: got void [noderef] __user *const __ptr
kernel/sysctl-test.c:176:9: sparse: sparse: incorrect type in argument 3 (different address spaces) @@ expected void * @@ got void [noderef] __user *buffer @@
kernel/sysctl-test.c:176:9: sparse: expected void *
kernel/sysctl-test.c:176:9: sparse: got void [noderef] __user *buffer
kernel/sysctl-test.c:176:9: sparse: sparse: incorrect type in argument 3 (different address spaces) @@ expected void * @@ got void [noderef] __user *buffer @@
kernel/sysctl-test.c:176:9: sparse: expected void *
kernel/sysctl-test.c:176:9: sparse: got void [noderef] __user *buffer
kernel/sysctl-test.c:206:9: sparse: sparse: incorrect type in argument 3 (different address spaces) @@ expected void * @@ got char [noderef] __user *user_buffer @@
kernel/sysctl-test.c:206:9: sparse: expected void *
kernel/sysctl-test.c:206:9: sparse: got char [noderef] __user *user_buffer
kernel/sysctl-test.c:206:9: sparse: sparse: incorrect type in argument 3 (different address spaces) @@ expected void * @@ got char [noderef] __user *user_buffer @@
kernel/sysctl-test.c:206:9: sparse: expected void *
kernel/sysctl-test.c:206:9: sparse: got char [noderef] __user *user_buffer
kernel/sysctl-test.c:237:9: sparse: sparse: incorrect type in argument 3 (different address spaces) @@ expected void * @@ got char [noderef] __user *user_buffer @@
kernel/sysctl-test.c:237:9: sparse: expected void *
kernel/sysctl-test.c:237:9: sparse: got char [noderef] __user *user_buffer
kernel/sysctl-test.c:237:9: sparse: sparse: incorrect type in argument 3 (different address spaces) @@ expected void * @@ got char [noderef] __user *user_buffer @@
kernel/sysctl-test.c:237:9: sparse: expected void *
kernel/sysctl-test.c:237:9: sparse: got char [noderef] __user *user_buffer
kernel/sysctl-test.c:269:9: sparse: sparse: incorrect type in argument 3 (different address spaces) @@ expected void * @@ got char [noderef] __user *user_buffer @@
kernel/sysctl-test.c:269:9: sparse: expected void *
kernel/sysctl-test.c:269:9: sparse: got char [noderef] __user *user_buffer
kernel/sysctl-test.c:269:9: sparse: sparse: incorrect type in argument 3 (different address spaces) @@ expected void * @@ got char [noderef] __user *user_buffer @@
kernel/sysctl-test.c:269:9: sparse: expected void *
kernel/sysctl-test.c:269:9: sparse: got char [noderef] __user *user_buffer
kernel/sysctl-test.c:300:9: sparse: sparse: incorrect type in argument 3 (different address spaces) @@ expected void * @@ got char [noderef] __user *user_buffer @@
kernel/sysctl-test.c:300:9: sparse: expected void *
kernel/sysctl-test.c:300:9: sparse: got char [noderef] __user *user_buffer
kernel/sysctl-test.c:300:9: sparse: sparse: incorrect type in argument 3 (different address spaces) @@ expected void * @@ got char [noderef] __user *user_buffer @@
kernel/sysctl-test.c:300:9: sparse: expected void *
kernel/sysctl-test.c:300:9: sparse: got char [noderef] __user *user_buffer
kernel/sysctl-test.c:341:9: sparse: sparse: incorrect type in argument 3 (different address spaces) @@ expected void * @@ got char [noderef] __user *user_buffer @@
kernel/sysctl-test.c:341:9: sparse: expected void *
kernel/sysctl-test.c:341:9: sparse: got char [noderef] __user *user_buffer
kernel/sysctl-test.c:341:9: sparse: sparse: incorrect type in argument 3 (different address spaces) @@ expected void * @@ got char [noderef] __user *user_buffer @@
kernel/sysctl-test.c:341:9: sparse: expected void *
kernel/sysctl-test.c:341:9: sparse: got char [noderef] __user *user_buffer
kernel/sysctl-test.c:374:9: sparse: sparse: incorrect type in argument 3 (different address spaces) @@ expected void * @@ got char [noderef] __user *user_buffer @@
kernel/sysctl-test.c:374:9: sparse: expected void *
kernel/sysctl-test.c:374:9: sparse: got char [noderef] __user *user_buffer
kernel/sysctl-test.c:374:9: sparse: sparse: incorrect type in argument 3 (different address spaces) @@ expected void * @@ got char [noderef] __user *user_buffer @@
kernel/sysctl-test.c:374:9: sparse: expected void *
kernel/sysctl-test.c:374:9: sparse: got char [noderef] __user *user_buffer
vim +38 kernel/sysctl-test.c
11
12 /*
13 * Test that proc_dointvec will not try to use a NULL .data field even when the
14 * length is non-zero.
15 */
16 static void sysctl_test_api_dointvec_null_tbl_data(struct kunit *test)
17 {
18 struct ctl_table null_data_table = {
19 .procname = "foo",
20 /*
21 * Here we are testing that proc_dointvec behaves correctly when
22 * we give it a NULL .data field. Normally this would point to a
23 * piece of memory where the value would be stored.
24 */
25 .data = NULL,
26 .maxlen = sizeof(int),
27 .mode = 0644,
28 .proc_handler = proc_dointvec,
29 .extra1 = SYSCTL_ZERO,
30 .extra2 = SYSCTL_ONE_HUNDRED,
31 };
32 /*
33 * proc_dointvec expects a buffer in user space, so we allocate one. We
34 * also need to cast it to __user so sparse doesn't get mad.
35 */
36 void __user *buffer = (void __user *)kunit_kzalloc(test, sizeof(int),
37 GFP_USER);
> 38 KUNIT_ASSERT_NOT_ERR_OR_NULL(test, buffer);
39 size_t len;
40 loff_t pos;
41
42 /*
43 * We don't care what the starting length is since proc_dointvec should
44 * not try to read because .data is NULL.
45 */
46 len = 1234;
47 KUNIT_EXPECT_EQ(test, 0, proc_dointvec(&null_data_table,
48 KUNIT_PROC_READ, buffer, &len,
49 &pos));
50 KUNIT_EXPECT_EQ(test, 0, len);
51
52 /*
53 * See above.
54 */
55 len = 1234;
56 KUNIT_EXPECT_EQ(test, 0, proc_dointvec(&null_data_table,
57 KUNIT_PROC_WRITE, buffer, &len,
58 &pos));
59 KUNIT_EXPECT_EQ(test, 0, len);
60 }
61
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