Peter Zijlstra 9a50dcaf04 ubsan, x86: Annotate and allow __ubsan_handle_shift_out_of_bounds() in uaccess regions ...

The new check_zeroed_user() function uses variable shifts inside of a
user_access_begin()/user_access_end() section and that results in GCC
emitting __ubsan_handle_shift_out_of_bounds() calls, even though
through value range analysis it would be able to see that the UB in
question is impossible.

Annotate and whitelist this UBSAN function; continued use of
user_access_begin()/user_access_end() will undoubtedly result in
further uses of function.

Reported-by: Randy Dunlap <rdunlap@infradead.org>
Tested-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Randy Dunlap <rdunlap@infradead.org>
Acked-by: Christian Brauner <christian.brauner@ubuntu.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: cyphar@cyphar.com
Cc: keescook@chromium.org
Cc: linux@rasmusvillemoes.dk
Fixes: f5a1a536fa ("lib: introduce copy_struct_from_user() helper")
Link: https://lkml.kernel.org/r/20191021131149.GA19358@hirez.programming.kicks-ass.net
Signed-off-by: Ingo Molnar <mingo@kernel.org>

2019-10-28 10:43:00 +01:00

..

arch/x86

objtool: Move x86 insn decoder to a common location

2019-08-31 22:27:52 -03:00

Documentation

docs: fix broken documentation links

2019-06-08 13:42:13 -06:00

.gitignore

objtool: Move synced files to their original relative locations

2017-11-07 10:48:23 +01:00

arch.h

objtool: Support conditional retpolines

2019-07-18 21:01:10 +02:00

Build

objtool: Fix build by linking against tools/lib/ctype.o sources

2019-07-02 10:49:31 -03:00

builtin-check.c

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 13

2019-05-21 11:28:45 +02:00

builtin-orc.c

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 13

2019-05-21 11:28:45 +02:00

builtin.h

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 13

2019-05-21 11:28:45 +02:00

cfi.h

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 13

2019-05-21 11:28:45 +02:00

check.c

ubsan, x86: Annotate and allow __ubsan_handle_shift_out_of_bounds() in uaccess regions

2019-10-28 10:43:00 +01:00

check.h

objtool: Improve UACCESS coverage

2019-07-25 08:36:39 +02:00

elf.c

objtool: Refactor jump table code

2019-07-18 21:01:09 +02:00

elf.h

objtool: Support repeated uses of the same C jump table

2019-07-18 21:01:09 +02:00

Makefile

Merge branch 'perf-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2019-09-16 17:06:21 -07:00

objtool.c

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 13

2019-05-21 11:28:45 +02:00

orc_dump.c

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 13

2019-05-21 11:28:45 +02:00

orc_gen.c

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 13

2019-05-21 11:28:45 +02:00

orc.h

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 13

2019-05-21 11:28:45 +02:00

special.c

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 13

2019-05-21 11:28:45 +02:00

special.h

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 13

2019-05-21 11:28:45 +02:00

sync-check.sh

objtool: Ignore intentional differences for the x86 insn decoder

2019-08-31 22:27:52 -03:00

warn.h

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 13

2019-05-21 11:28:45 +02:00