Hi all, this series removes the last set_fs() used to force a kernel address space for the uaccess code in the kernel read/write/splice code, and then stops implementing the address space overrides entirely for x86 and powerpc.
The file system part has been posted a few times, and the read/write side has been pretty much unchanced. For splice this series drops the conversion of the seq_file and sysctl code to the iter ops, and thus loses the splice support for them. The reasons for that is that it caused a lot of churn for not much use - splice for these small files really isn't much of a win, even if existing userspace uses it. All callers I found do the proper fallback, but if this turns out to be an issue the conversion can be resurrected. Besides x86 and powerpc I plan to eventually convert all other architectures, although this will be a slow process, starting with the easier ones once the infrastructure is merged. The process to convert architectures is roughtly: - ensure there is no set_fs(KERNEL_DS) left in arch specific code - implement __get_kernel_nofault and __put_kernel_nofault - remove the arch specific address limitation functionality Diffstat: arch/Kconfig | 3 arch/alpha/Kconfig | 1 arch/arc/Kconfig | 1 arch/arm/Kconfig | 1 arch/arm64/Kconfig | 1 arch/c6x/Kconfig | 1 arch/csky/Kconfig | 1 arch/h8300/Kconfig | 1 arch/hexagon/Kconfig | 1 arch/ia64/Kconfig | 1 arch/m68k/Kconfig | 1 arch/microblaze/Kconfig | 1 arch/mips/Kconfig | 1 arch/nds32/Kconfig | 1 arch/nios2/Kconfig | 1 arch/openrisc/Kconfig | 1 arch/parisc/Kconfig | 1 arch/powerpc/include/asm/processor.h | 7 - arch/powerpc/include/asm/thread_info.h | 5 - arch/powerpc/include/asm/uaccess.h | 78 ++++++++----------- arch/powerpc/kernel/signal.c | 3 arch/powerpc/lib/sstep.c | 6 - arch/riscv/Kconfig | 1 arch/s390/Kconfig | 1 arch/sh/Kconfig | 1 arch/sparc/Kconfig | 1 arch/um/Kconfig | 1 arch/x86/ia32/ia32_aout.c | 1 arch/x86/include/asm/page_32_types.h | 11 ++ arch/x86/include/asm/page_64_types.h | 38 +++++++++ arch/x86/include/asm/processor.h | 60 --------------- arch/x86/include/asm/thread_info.h | 2 arch/x86/include/asm/uaccess.h | 26 ------ arch/x86/kernel/asm-offsets.c | 3 arch/x86/lib/getuser.S | 28 ++++--- arch/x86/lib/putuser.S | 21 +++-- arch/xtensa/Kconfig | 1 drivers/char/mem.c | 16 ---- drivers/misc/lkdtm/bugs.c | 2 drivers/misc/lkdtm/core.c | 4 + drivers/misc/lkdtm/usercopy.c | 2 fs/read_write.c | 69 ++++++++++------- fs/splice.c | 130 +++------------------------------ include/linux/fs.h | 2 include/linux/uaccess.h | 18 ++++ lib/test_bitmap.c | 10 ++ 46 files changed, 235 insertions(+), 332 deletions(-)
