Adding Linus as I forgot to add him to the patch bomb, sorry.. On Mon, Aug 17, 2020 at 09:32:01AM +0200, Christoph Hellwig wrote: > 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(-) ---end quoted text---
