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| author | Peter Zijlstra <peterz@infradead.org> | 2019-04-24 09:19:25 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-05-31 06:47:24 -0700 |
| commit | a7ab08b7c34840ff2c73ad67adf64ac71fc9b5c0 (patch) | |
| tree | 313633ec8b5df803d892c55bf45b429c2e2aa949 /drivers/mcb | |
| parent | 4295324c3f659c13e72d7d1eaf495da8c7270a2a (diff) | |
mm/uaccess: Use 'unsigned long' to placate UBSAN warnings on older GCC versions
[ Upstream commit 29da93fea3ea39ab9b12270cc6be1b70ef201c9e ]
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>
Diffstat (limited to 'drivers/mcb')
0 files changed, 0 insertions, 0 deletions