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Message-ID: <202511110100.9uPtQqN1-lkp@intel.com>
Date: Tue, 11 Nov 2025 01:47:19 +0800
From: kernel test robot <lkp@...el.com>
To: Alejandro Colomar <alx@...nel.org>, linux-kernel@...r.kernel.org
Cc: llvm@...ts.linux.dev, oe-kbuild-all@...ts.linux.dev,
Alejandro Colomar <alx@...nel.org>, Marco Elver <elver@...gle.com>,
Kees Cook <kees@...nel.org>,
Christopher Bazley <chris.bazley.wg14@...il.com>,
Alexander Potapenko <glider@...gle.com>,
Dmitry Vyukov <dvyukov@...gle.com>, Jann Horn <jannh@...gle.com>,
Andrew Morton <akpm@...ux-foundation.org>,
Linux Memory Management List <linux-mm@...ck.org>,
Rasmus Villemoes <linux@...musvillemoes.dk>,
Michal Hocko <mhocko@...e.com>, Al Viro <viro@...iv.linux.org.uk>
Subject: Re: [PATCH v1 2/3] mm: Fix benign off-by-one bugs
Hi Alejandro,
kernel test robot noticed the following build errors:
[auto build test ERROR on akpm-mm/mm-everything]
[also build test ERROR on kees/for-next/pstore kees/for-next/kspp linus/master linux/master v6.18-rc5 next-20251110]
[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/Alejandro-Colomar/array_size-h-Add-ARRAY_END/20251110-075203
base: https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything
patch link: https://lore.kernel.org/r/87445e701574058b142e036c3b8a0f505086ab64.1758806023.git.alx%40kernel.org
patch subject: [PATCH v1 2/3] mm: Fix benign off-by-one bugs
config: loongarch-randconfig-001-20251110 (https://download.01.org/0day-ci/archive/20251111/202511110100.9uPtQqN1-lkp@intel.com/config)
compiler: clang version 22.0.0git (https://github.com/llvm/llvm-project 996639d6ebb86ff15a8c99b67f1c2e2117636ae7)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251111/202511110100.9uPtQqN1-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/202511110100.9uPtQqN1-lkp@intel.com/
All errors (new ones prefixed by >>):
>> mm/kfence/kfence_test.c:113:8: error: call to undeclared function 'ENDOF'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
113 | end = ENDOF(expect[0]);
| ^
>> mm/kfence/kfence_test.c:113:6: error: incompatible integer to pointer conversion assigning to 'const char *' from 'int' [-Wint-conversion]
113 | end = ENDOF(expect[0]);
| ^ ~~~~~~~~~~~~~~~~
mm/kfence/kfence_test.c:143:6: error: incompatible integer to pointer conversion assigning to 'const char *' from 'int' [-Wint-conversion]
143 | end = ENDOF(expect[1]);
| ^ ~~~~~~~~~~~~~~~~
3 errors generated.
vim +/ENDOF +113 mm/kfence/kfence_test.c
94
95 /* Check observed report matches information in @r. */
96 static bool report_matches(const struct expect_report *r)
97 {
98 unsigned long addr = (unsigned long)r->addr;
99 bool ret = false;
100 unsigned long flags;
101 typeof(observed.lines) expect;
102 const char *end;
103 char *cur;
104
105 /* Doubled-checked locking. */
106 if (!report_available())
107 return false;
108
109 /* Generate expected report contents. */
110
111 /* Title */
112 cur = expect[0];
> 113 end = ENDOF(expect[0]);
114 switch (r->type) {
115 case KFENCE_ERROR_OOB:
116 cur += scnprintf(cur, end - cur, "BUG: KFENCE: out-of-bounds %s",
117 get_access_type(r));
118 break;
119 case KFENCE_ERROR_UAF:
120 cur += scnprintf(cur, end - cur, "BUG: KFENCE: use-after-free %s",
121 get_access_type(r));
122 break;
123 case KFENCE_ERROR_CORRUPTION:
124 cur += scnprintf(cur, end - cur, "BUG: KFENCE: memory corruption");
125 break;
126 case KFENCE_ERROR_INVALID:
127 cur += scnprintf(cur, end - cur, "BUG: KFENCE: invalid %s",
128 get_access_type(r));
129 break;
130 case KFENCE_ERROR_INVALID_FREE:
131 cur += scnprintf(cur, end - cur, "BUG: KFENCE: invalid free");
132 break;
133 }
134
135 scnprintf(cur, end - cur, " in %pS", r->fn);
136 /* The exact offset won't match, remove it; also strip module name. */
137 cur = strchr(expect[0], '+');
138 if (cur)
139 *cur = '\0';
140
141 /* Access information */
142 cur = expect[1];
143 end = ENDOF(expect[1]);
144
145 switch (r->type) {
146 case KFENCE_ERROR_OOB:
147 cur += scnprintf(cur, end - cur, "Out-of-bounds %s at", get_access_type(r));
148 addr = arch_kfence_test_address(addr);
149 break;
150 case KFENCE_ERROR_UAF:
151 cur += scnprintf(cur, end - cur, "Use-after-free %s at", get_access_type(r));
152 addr = arch_kfence_test_address(addr);
153 break;
154 case KFENCE_ERROR_CORRUPTION:
155 cur += scnprintf(cur, end - cur, "Corrupted memory at");
156 break;
157 case KFENCE_ERROR_INVALID:
158 cur += scnprintf(cur, end - cur, "Invalid %s at", get_access_type(r));
159 addr = arch_kfence_test_address(addr);
160 break;
161 case KFENCE_ERROR_INVALID_FREE:
162 cur += scnprintf(cur, end - cur, "Invalid free of");
163 break;
164 }
165
166 cur += scnprintf(cur, end - cur, " 0x%p", (void *)addr);
167
168 spin_lock_irqsave(&observed.lock, flags);
169 if (!report_available())
170 goto out; /* A new report is being captured. */
171
172 /* Finally match expected output to what we actually observed. */
173 ret = strstr(observed.lines[0], expect[0]) && strstr(observed.lines[1], expect[1]);
174 out:
175 spin_unlock_irqrestore(&observed.lock, flags);
176 return ret;
177 }
178
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
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