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Date: Wed, 13 Jan 2021 08:18:01 +0800
From: kernel test robot <lkp@...el.com>
To: Nathan Chancellor <natechancellor@...il.com>,
Kees Cook <keescook@...omium.org>,
Andrew Morton <akpm@...ux-foundation.org>
Cc: kbuild-all@...ts.01.org,
Linux Memory Management List <linux-mm@...ck.org>,
Nick Desaulniers <ndesaulniers@...gle.com>,
linux-kernel@...r.kernel.org, clang-built-linux@...glegroups.com,
Nathan Chancellor <natechancellor@...il.com>
Subject: Re: [PATCH] ubsan: Implement __ubsan_handle_alignment_assumption
Hi Nathan,
I love your patch! Perhaps something to improve:
[auto build test WARNING on 7c53f6b671f4aba70ff15e1b05148b10d58c2837]
url: https://github.com/0day-ci/linux/commits/Nathan-Chancellor/ubsan-Implement-__ubsan_handle_alignment_assumption/20210113-055714
base: 7c53f6b671f4aba70ff15e1b05148b10d58c2837
config: m68k-allmodconfig (attached as .config)
compiler: m68k-linux-gcc (GCC) 9.3.0
reproduce (this is a W=1 build):
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# https://github.com/0day-ci/linux/commit/775adad26a60878926c0ee6cd460a1375bbe51e6
git remote add linux-review https://github.com/0day-ci/linux
git fetch --no-tags linux-review Nathan-Chancellor/ubsan-Implement-__ubsan_handle_alignment_assumption/20210113-055714
git checkout 775adad26a60878926c0ee6cd460a1375bbe51e6
# save the attached .config to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=m68k
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@...el.com>
All warnings (new ones prefixed by >>):
lib/ubsan.c:192:6: warning: no previous prototype for '__ubsan_handle_add_overflow' [-Wmissing-prototypes]
192 | void __ubsan_handle_add_overflow(void *data,
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~
lib/ubsan.c:200:6: warning: no previous prototype for '__ubsan_handle_sub_overflow' [-Wmissing-prototypes]
200 | void __ubsan_handle_sub_overflow(void *data,
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~
lib/ubsan.c:207:6: warning: no previous prototype for '__ubsan_handle_mul_overflow' [-Wmissing-prototypes]
207 | void __ubsan_handle_mul_overflow(void *data,
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~
lib/ubsan.c:214:6: warning: no previous prototype for '__ubsan_handle_negate_overflow' [-Wmissing-prototypes]
214 | void __ubsan_handle_negate_overflow(void *_data, void *old_val)
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
lib/ubsan.c:234:6: warning: no previous prototype for '__ubsan_handle_divrem_overflow' [-Wmissing-prototypes]
234 | void __ubsan_handle_divrem_overflow(void *_data, void *lhs, void *rhs)
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
lib/ubsan.c:315:6: warning: no previous prototype for '__ubsan_handle_type_mismatch' [-Wmissing-prototypes]
315 | void __ubsan_handle_type_mismatch(struct type_mismatch_data *data,
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
lib/ubsan.c:329:6: warning: no previous prototype for '__ubsan_handle_type_mismatch_v1' [-Wmissing-prototypes]
329 | void __ubsan_handle_type_mismatch_v1(void *_data, void *ptr)
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
lib/ubsan.c:343:6: warning: no previous prototype for '__ubsan_handle_out_of_bounds' [-Wmissing-prototypes]
343 | void __ubsan_handle_out_of_bounds(void *_data, void *index)
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
lib/ubsan.c:360:6: warning: no previous prototype for '__ubsan_handle_shift_out_of_bounds' [-Wmissing-prototypes]
360 | void __ubsan_handle_shift_out_of_bounds(void *_data, void *lhs, void *rhs)
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
lib/ubsan.c:402:6: warning: no previous prototype for '__ubsan_handle_builtin_unreachable' [-Wmissing-prototypes]
402 | void __ubsan_handle_builtin_unreachable(void *_data)
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
lib/ubsan.c:412:6: warning: no previous prototype for '__ubsan_handle_load_invalid_value' [-Wmissing-prototypes]
412 | void __ubsan_handle_load_invalid_value(void *_data, void *val)
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>> lib/ubsan.c:431:6: warning: no previous prototype for '__ubsan_handle_alignment_assumption' [-Wmissing-prototypes]
431 | void __ubsan_handle_alignment_assumption(void *_data, unsigned long ptr,
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
vim +/__ubsan_handle_alignment_assumption +431 lib/ubsan.c
359
> 360 void __ubsan_handle_shift_out_of_bounds(void *_data, void *lhs, void *rhs)
361 {
362 struct shift_out_of_bounds_data *data = _data;
363 struct type_descriptor *rhs_type = data->rhs_type;
364 struct type_descriptor *lhs_type = data->lhs_type;
365 char rhs_str[VALUE_LENGTH];
366 char lhs_str[VALUE_LENGTH];
367 unsigned long ua_flags = user_access_save();
368
369 if (suppress_report(&data->location))
370 goto out;
371
372 ubsan_prologue(&data->location, "shift-out-of-bounds");
373
374 val_to_string(rhs_str, sizeof(rhs_str), rhs_type, rhs);
375 val_to_string(lhs_str, sizeof(lhs_str), lhs_type, lhs);
376
377 if (val_is_negative(rhs_type, rhs))
378 pr_err("shift exponent %s is negative\n", rhs_str);
379
380 else if (get_unsigned_val(rhs_type, rhs) >=
381 type_bit_width(lhs_type))
382 pr_err("shift exponent %s is too large for %u-bit type %s\n",
383 rhs_str,
384 type_bit_width(lhs_type),
385 lhs_type->type_name);
386 else if (val_is_negative(lhs_type, lhs))
387 pr_err("left shift of negative value %s\n",
388 lhs_str);
389 else
390 pr_err("left shift of %s by %s places cannot be"
391 " represented in type %s\n",
392 lhs_str, rhs_str,
393 lhs_type->type_name);
394
395 ubsan_epilogue();
396 out:
397 user_access_restore(ua_flags);
398 }
399 EXPORT_SYMBOL(__ubsan_handle_shift_out_of_bounds);
400
401
402 void __ubsan_handle_builtin_unreachable(void *_data)
403 {
404 struct unreachable_data *data = _data;
405 ubsan_prologue(&data->location, "unreachable");
406 pr_err("calling __builtin_unreachable()\n");
407 ubsan_epilogue();
408 panic("can't return from __builtin_unreachable()");
409 }
410 EXPORT_SYMBOL(__ubsan_handle_builtin_unreachable);
411
412 void __ubsan_handle_load_invalid_value(void *_data, void *val)
413 {
414 struct invalid_value_data *data = _data;
415 char val_str[VALUE_LENGTH];
416
417 if (suppress_report(&data->location))
418 return;
419
420 ubsan_prologue(&data->location, "invalid-load");
421
422 val_to_string(val_str, sizeof(val_str), data->type, val);
423
424 pr_err("load of value %s is not a valid value for type %s\n",
425 val_str, data->type->type_name);
426
427 ubsan_epilogue();
428 }
429 EXPORT_SYMBOL(__ubsan_handle_load_invalid_value);
430
> 431 void __ubsan_handle_alignment_assumption(void *_data, unsigned long ptr,
---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
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