Files
linux/lib
Peter Zijlstra 189b396a25 mm/uaccess: Use 'unsigned long' to placate UBSAN warnings on older GCC versions
[ Upstream commit 29da93fea3 ]

Randy reported objtool triggered on his (GCC-7.4) build:

  lib/strncpy_from_user.o: warning: objtool: strncpy_from_user()+0x315: call to __ubsan_handle_add_overflow() with UACCESS enabled
  lib/strnlen_user.o: warning: objtool: strnlen_user()+0x337: call to __ubsan_handle_sub_overflow() with UACCESS enabled

This is due to UBSAN generating signed-overflow-UB warnings where it
should not. Prior to GCC-8 UBSAN ignored -fwrapv (which the kernel
uses through -fno-strict-overflow).

Make the functions use 'unsigned long' throughout.

Reported-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Randy Dunlap <rdunlap@infradead.org> # build-tested
Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: luto@kernel.org
Link: http://lkml.kernel.org/r/20190424072208.754094071@infradead.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2019-05-31 06:46:16 -07:00
..
2018-07-10 15:00:52 -06:00
2018-08-22 10:52:48 -07:00
2017-12-01 13:09:40 -08:00
2017-12-01 13:09:40 -08:00
2018-10-12 09:17:46 +02:00
2018-08-16 12:14:42 -07:00
2017-12-01 13:09:40 -08:00
2018-02-06 18:32:44 -08:00
2018-08-22 10:52:48 -07:00
2018-07-23 15:22:39 +10:00
2019-04-20 09:16:05 +02:00
2018-02-06 18:32:44 -08:00
2017-10-07 10:45:14 -06:00
2017-02-24 17:46:57 -08:00
2019-05-22 07:37:45 +02:00
2018-06-12 16:19:22 -07:00
2018-05-01 10:22:41 -04:00
2018-04-12 09:41:19 -07:00
2018-06-12 16:19:22 -07:00
2017-12-01 13:09:40 -08:00
2017-12-01 13:09:40 -08:00
2016-12-06 10:17:03 +02:00
2018-08-21 23:54:21 -04:00
2019-04-17 08:38:45 +02:00
2018-06-27 18:58:49 +03:00
2018-10-15 16:31:29 -04:00
2018-04-23 16:39:35 +01:00
2017-08-15 09:02:07 -07:00