kernel/linux.git/arch/s390/lib, branch v5.15.208

s390/uaccess: add missing earlyclobber annotations to __clear_user()

2023-04-05T09:25:01+00:00

commit 89aba4c26fae4e459f755a18912845c348ee48f3 upstream. Add missing earlyclobber annotation to size, to, and tmp2 operands of the __clear_user() inline assembly since they are modified or written to before the last usage of all input operands. This can lead to incorrect register allocation for the inline assembly. Fixes: 6c2a9e6df604 ("[S390] Use alternative user-copy operations for new hardware.") Reported-by: Mark Rutland Link: https://lore.kernel.org/all/20230321122514.1743889-3-mark.rutland@arm.com/ Cc: stable@vger.kernel.org Reviewed-by: Gerald Schaefer Signed-off-by: Heiko Carstens Signed-off-by: Vasily Gorbik Signed-off-by: Greg Kroah-Hartman

s390/uaccess: add missing EX_TABLE entries to __clear_user()

2022-11-10T17:15:32+00:00

[ Upstream commit 4e1b5a86a5edfbefc9396d41b0fc1a2ebd0101b6 ] For some exception types the instruction address points behind the instruction that caused the exception. Take that into account and add the missing exception table entries. Cc: Reviewed-by: Vasily Gorbik Signed-off-by: Heiko Carstens Signed-off-by: Vasily Gorbik Signed-off-by: Sasha Levin

s390/test_unwind: use raw opcode instead of invalid instruction

2021-12-17T09:30:14+00:00

[ Upstream commit 53ae7230918154d1f4281d7aa3aae9650436eadf ] Building with clang & LLVM_IAS=1 leads to an error: arch/s390/lib/test_unwind.c:179:4: error: invalid register pair " mvcl %%r1,%%r1\n" ^ The test creates an invalid instruction that would trap at runtime, but the LLVM inline assembler tries to validate it at compile time too. Use the raw instruction opcode instead. Reported-by: Nick Desaulniers Signed-off-by: Ilie Halip Reviewed-by: Nick Desaulniers Suggested-by: Ulrich Weigand Link: https://github.com/ClangBuiltLinux/linux/issues/1421 Link: https://lore.kernel.org/r/20211117174822.3632412-1-ilie.halip@gmail.com Reviewed-by: Christian Borntraeger Signed-off-by: Christian Borntraeger [hca@linux.ibm.com: use illegal opcode, and update comment] Signed-off-by: Heiko Carstens Signed-off-by: Sasha Levin

s390: fix strrchr() implementation

2021-10-12T11:07:37+00:00

Fix two problems found in the strrchr() implementation for s390 architectures: evaluate empty strings (return the string address instead of NULL, if '\0' is passed as second argument); evaluate the first character of non-empty strings (the current implementation stops at the second). Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") Cc: stable@vger.kernel.org Reported-by: Heiko Carstens (incorrect behavior with empty strings) Signed-off-by: Roberto Sassu Link: https://lore.kernel.org/r/20211005120836.60630-1-roberto.sassu@huawei.com Signed-off-by: Heiko Carstens Signed-off-by: Vasily Gorbik

arch: remove compat_alloc_user_space

2021-09-08T22:32:35+00:00

All users of compat_alloc_user_space() and copy_in_user() have been removed from the kernel, only a few functions in sparc remain that can be changed to calling arch_copy_in_user() instead. Link: https://lkml.kernel.org/r/20210727144859.4150043-7-arnd@kernel.org Signed-off-by: Arnd Bergmann Reviewed-by: Christoph Hellwig Cc: Al Viro Cc: Benjamin Herrenschmidt Cc: Borislav Petkov Cc: Catalin Marinas Cc: Christian Borntraeger Cc: Christoph Hellwig Cc: "David S. Miller" Cc: Eric Biederman Cc: Feng Tang Cc: Heiko Carstens Cc: Helge Deller Cc: "H. Peter Anvin" Cc: Ingo Molnar Cc: "James E.J. Bottomley" Cc: Michael Ellerman Cc: Paul Mackerras Cc: Thomas Bogendoerfer Cc: Thomas Gleixner Cc: Vasily Gorbik Cc: Will Deacon Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

Merge tag 'asm-generic-5.15' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/asm-generic

2021-09-01T22:13:02+00:00

Pull asm-generic updates from Arnd Bergmann: "The main content for 5.15 is a series that cleans up the handling of strncpy_from_user() and strnlen_user(), removing a lot of slightly incorrect versions of these in favor of the lib/strn*.c helpers that implement these correctly and more efficiently. The only architectures that retain a private version now are mips, ia64, um and parisc. I had offered to convert those at all, but Thomas Bogendoerfer wanted to keep the mips version for the moment until he had a chance to do regression testing. The branch also contains two patches for bitops and for ffs()" * tag 'asm-generic-5.15' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/asm-generic: bitops/non-atomic: make @nr unsigned to avoid any DIV asm-generic: ffs: Drop bogus reference to ffz location asm-generic: reverse GENERIC_{STRNCPY_FROM,STRNLEN}_USER symbols asm-generic: remove extra strn{cpy_from,len}_user declarations asm-generic: uaccess: remove inline strncpy_from_user/strnlen_user s390: use generic strncpy/strnlen from_user microblaze: use generic strncpy/strnlen from_user csky: use generic strncpy/strnlen from_user arc: use generic strncpy/strnlen from_user hexagon: use generic strncpy/strnlen from_user h8300: remove stale strncpy_from_user asm-generic/uaccess.h: remove __strncpy_from_user/__strnlen_user

s390: use generic strncpy/strnlen from_user

2021-07-27T21:01:13+00:00

The s390 variant of strncpy_from_user() is slightly faster than the generic variant, however convert to the generic variant now to follow most if not all other architectures. Converting to the generic variant was already considered a couple of years ago. See commit f5c8b9601036 ("s390/uaccess: use sane length for __strncpy_from_user()"). Signed-off-by: Heiko Carstens Signed-off-by: Arnd Bergmann

s390/delay: get rid of not needed header includes

2021-07-27T07:39:22+00:00

After all the changes to delay.c there are many includes which are not needed anymore. Get rid of them. Signed-off-by: Heiko Carstens

s390/lib: use call_on_stack() macro

2021-07-08T20:12:18+00:00

Reviewed-by: Sven Schnelle Signed-off-by: Heiko Carstens Signed-off-by: Vasily Gorbik

s390/lib,string: fix strcat() inline asm constraint modifier

2021-07-05T10:44:23+00:00

"dummy" is not only used as output but also as input. Therefore use the correct "+" constraint modifier. Fixes: 8cf23c8e1fec ("s390/lib,string: get rid of register asm") Reported-by: Sven Schnelle Signed-off-by: Heiko Carstens Signed-off-by: Vasily Gorbik