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Message-ID: <202505220326.5yDQHjnt-lkp@intel.com>
Date: Thu, 22 May 2025 04:02:41 +0800
From: kernel test robot <lkp@...el.com>
To: Bhupesh <bhupesh@...lia.com>, akpm@...ux-foundation.org
Cc: oe-kbuild-all@...ts.linux.dev, bhupesh@...lia.com,
kernel-dev@...lia.com, linux-kernel@...r.kernel.org,
bpf@...r.kernel.org, linux-perf-users@...r.kernel.org,
linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
oliver.sang@...el.com, lkp@...el.com, laoar.shao@...il.com,
pmladek@...e.com, rostedt@...dmis.org,
mathieu.desnoyers@...icios.com, arnaldo.melo@...il.com,
alexei.starovoitov@...il.com, andrii.nakryiko@...il.com,
mirq-linux@...e.qmqm.pl, peterz@...radead.org, willy@...radead.org,
david@...hat.com, viro@...iv.linux.org.uk, keescook@...omium.org,
ebiederm@...ssion.com, brauner@...nel.org, jack@...e.cz,
mingo@...hat.com, juri.lelli@...hat.com, bsegall@...gle.com,
mgorman@...e.de
Subject: Re: [PATCH v4 2/3] treewide: Switch memcpy() users of 'task->comm'
to a more safer implementation
Hi Bhupesh,
kernel test robot noticed the following build warnings:
[auto build test WARNING on trace/for-next]
[also build test WARNING on tip/sched/core akpm-mm/mm-everything linus/master v6.15-rc7 next-20250521]
[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/Bhupesh/exec-Remove-obsolete-comments/20250521-142443
base: https://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace for-next
patch link: https://lore.kernel.org/r/20250521062337.53262-3-bhupesh%40igalia.com
patch subject: [PATCH v4 2/3] treewide: Switch memcpy() users of 'task->comm' to a more safer implementation
config: arc-randconfig-002-20250522 (https://download.01.org/0day-ci/archive/20250522/202505220326.5yDQHjnt-lkp@intel.com/config)
compiler: arc-linux-gcc (GCC) 8.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250522/202505220326.5yDQHjnt-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/202505220326.5yDQHjnt-lkp@intel.com/
All warnings (new ones prefixed by >>):
In file included from fs/coredump.c:20:
fs/coredump.c: In function 'do_coredump':
>> include/linux/coredump.h:57:7: warning: array subscript 16 is above array bounds of 'char[16]' [-Warray-bounds]
comm[TASK_COMM_LEN] = '\0'; \
~~~~^~~~~~~~~~~~~~~
include/linux/coredump.h:63:43: note: in expansion of macro '__COREDUMP_PRINTK'
#define coredump_report_failure(fmt, ...) __COREDUMP_PRINTK(KERN_WARNING, fmt, ##__VA_ARGS__)
^~~~~~~~~~~~~~~~~
fs/coredump.c:655:4: note: in expansion of macro 'coredump_report_failure'
coredump_report_failure(
^~~~~~~~~~~~~~~~~~~~~~~
>> include/linux/coredump.h:57:7: warning: array subscript 16 is above array bounds of 'char[16]' [-Warray-bounds]
comm[TASK_COMM_LEN] = '\0'; \
~~~~^~~~~~~~~~~~~~~
include/linux/coredump.h:63:43: note: in expansion of macro '__COREDUMP_PRINTK'
#define coredump_report_failure(fmt, ...) __COREDUMP_PRINTK(KERN_WARNING, fmt, ##__VA_ARGS__)
^~~~~~~~~~~~~~~~~
fs/coredump.c:730:4: note: in expansion of macro 'coredump_report_failure'
coredump_report_failure("Core dump to %s aborted: "
^~~~~~~~~~~~~~~~~~~~~~~
>> include/linux/coredump.h:57:7: warning: array subscript 16 is above array bounds of 'char[16]' [-Warray-bounds]
comm[TASK_COMM_LEN] = '\0'; \
~~~~^~~~~~~~~~~~~~~
include/linux/coredump.h:63:43: note: in expansion of macro '__COREDUMP_PRINTK'
#define coredump_report_failure(fmt, ...) __COREDUMP_PRINTK(KERN_WARNING, fmt, ##__VA_ARGS__)
^~~~~~~~~~~~~~~~~
fs/coredump.c:725:4: note: in expansion of macro 'coredump_report_failure'
coredump_report_failure("Core dump to %s aborted: "
^~~~~~~~~~~~~~~~~~~~~~~
>> include/linux/coredump.h:57:7: warning: array subscript 16 is above array bounds of 'char[16]' [-Warray-bounds]
comm[TASK_COMM_LEN] = '\0'; \
~~~~^~~~~~~~~~~~~~~
include/linux/coredump.h:63:43: note: in expansion of macro '__COREDUMP_PRINTK'
#define coredump_report_failure(fmt, ...) __COREDUMP_PRINTK(KERN_WARNING, fmt, ##__VA_ARGS__)
^~~~~~~~~~~~~~~~~
fs/coredump.c:618:4: note: in expansion of macro 'coredump_report_failure'
coredump_report_failure("over core_pipe_limit, skipping core dump");
^~~~~~~~~~~~~~~~~~~~~~~
>> include/linux/coredump.h:57:7: warning: array subscript 16 is above array bounds of 'char[16]' [-Warray-bounds]
comm[TASK_COMM_LEN] = '\0'; \
~~~~^~~~~~~~~~~~~~~
include/linux/coredump.h:63:43: note: in expansion of macro '__COREDUMP_PRINTK'
#define coredump_report_failure(fmt, ...) __COREDUMP_PRINTK(KERN_WARNING, fmt, ##__VA_ARGS__)
^~~~~~~~~~~~~~~~~
fs/coredump.c:642:4: note: in expansion of macro 'coredump_report_failure'
coredump_report_failure("|%s pipe failed", cn.corename);
^~~~~~~~~~~~~~~~~~~~~~~
>> include/linux/coredump.h:57:7: warning: array subscript 16 is above array bounds of 'char[16]' [-Warray-bounds]
comm[TASK_COMM_LEN] = '\0'; \
~~~~^~~~~~~~~~~~~~~
include/linux/coredump.h:63:43: note: in expansion of macro '__COREDUMP_PRINTK'
#define coredump_report_failure(fmt, ...) __COREDUMP_PRINTK(KERN_WARNING, fmt, ##__VA_ARGS__)
^~~~~~~~~~~~~~~~~
fs/coredump.c:625:4: note: in expansion of macro 'coredump_report_failure'
coredump_report_failure("%s failed to allocate memory", __func__);
^~~~~~~~~~~~~~~~~~~~~~~
>> include/linux/coredump.h:57:7: warning: array subscript 16 is above array bounds of 'char[16]' [-Warray-bounds]
comm[TASK_COMM_LEN] = '\0'; \
~~~~^~~~~~~~~~~~~~~
include/linux/coredump.h:63:43: note: in expansion of macro '__COREDUMP_PRINTK'
#define coredump_report_failure(fmt, ...) __COREDUMP_PRINTK(KERN_WARNING, fmt, ##__VA_ARGS__)
^~~~~~~~~~~~~~~~~
fs/coredump.c:611:4: note: in expansion of macro 'coredump_report_failure'
coredump_report_failure("RLIMIT_CORE is set to 1, aborting core");
^~~~~~~~~~~~~~~~~~~~~~~
>> include/linux/coredump.h:57:7: warning: array subscript 16 is above array bounds of 'char[16]' [-Warray-bounds]
comm[TASK_COMM_LEN] = '\0'; \
~~~~^~~~~~~~~~~~~~~
include/linux/coredump.h:63:43: note: in expansion of macro '__COREDUMP_PRINTK'
#define coredump_report_failure(fmt, ...) __COREDUMP_PRINTK(KERN_WARNING, fmt, ##__VA_ARGS__)
^~~~~~~~~~~~~~~~~
fs/coredump.c:591:4: note: in expansion of macro 'coredump_report_failure'
coredump_report_failure("format_corename failed, aborting core");
^~~~~~~~~~~~~~~~~~~~~~~
>> include/linux/coredump.h:57:7: warning: array subscript 16 is above array bounds of 'char[16]' [-Warray-bounds]
comm[TASK_COMM_LEN] = '\0'; \
~~~~^~~~~~~~~~~~~~~
include/linux/coredump.h:63:43: note: in expansion of macro '__COREDUMP_PRINTK'
#define coredump_report_failure(fmt, ...) __COREDUMP_PRINTK(KERN_WARNING, fmt, ##__VA_ARGS__)
^~~~~~~~~~~~~~~~~
fs/coredump.c:752:4: note: in expansion of macro 'coredump_report_failure'
coredump_report_failure("Core dump to |%s disabled", cn.corename);
^~~~~~~~~~~~~~~~~~~~~~~
fs/coredump.c: In function 'validate_coredump_safety':
>> include/linux/coredump.h:57:7: warning: array subscript 16 is above array bounds of 'char[16]' [-Warray-bounds]
comm[TASK_COMM_LEN] = '\0'; \
~~~~^~~~~~~~~~~~~~~
include/linux/coredump.h:63:43: note: in expansion of macro '__COREDUMP_PRINTK'
#define coredump_report_failure(fmt, ...) __COREDUMP_PRINTK(KERN_WARNING, fmt, ##__VA_ARGS__)
^~~~~~~~~~~~~~~~~
fs/coredump.c:1006:3: note: in expansion of macro 'coredump_report_failure'
coredump_report_failure("Unsafe core_pattern used with fs.suid_dumpable=2: "
^~~~~~~~~~~~~~~~~~~~~~~
vim +57 include/linux/coredump.h
46
47 /*
48 * Logging for the coredump code, ratelimited.
49 * The TGID and comm fields are added to the message.
50 */
51
52 #define __COREDUMP_PRINTK(Level, Format, ...) \
53 do { \
54 char comm[TASK_COMM_LEN]; \
55 /* This will always be NUL terminated. */ \
56 memcpy(comm, current->comm, TASK_COMM_LEN); \
> 57 comm[TASK_COMM_LEN] = '\0'; \
58 printk_ratelimited(Level "coredump: %d(%*pE): " Format "\n", \
59 task_tgid_vnr(current), (int)strlen(comm), comm, ##__VA_ARGS__); \
60 } while (0) \
61
--
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