Daniel Borkmann 75a1a607bb uaccess: Add strict non-pagefault kernel-space read function ... Add two new probe_kernel_read_strict() and strncpy_from_unsafe_strict() helpers which by default alias to the __probe_kernel_read() and the __strncpy_from_unsafe(), respectively, but can be overridden by archs which have non-overlapping address ranges for kernel space and user space in order to bail out with -EFAULT when attempting to probe user memory including non-canonical user access addresses [0]: 4-level page tables: user-space mem: 0x0000000000000000 - 0x00007fffffffffff non-canonical: 0x0000800000000000 - 0xffff7fffffffffff 5-level page tables: user-space mem: 0x0000000000000000 - 0x00ffffffffffffff non-canonical: 0x0100000000000000 - 0xfeffffffffffffff The idea is that these helpers are complementary to the probe_user_read() and strncpy_from_unsafe_user() which probe user-only memory. Both added helpers here do the same, but for kernel-only addresses. Both set of helpers are going to be used for BPF tracing. They also explicitly avoid throwing the splat for non-canonical user addresses from 00c42373d3 ("x86-64: add warning for non-canonical user access address dereferences"). For compat, the current probe_kernel_read() and strncpy_from_unsafe() are left as-is. [0] Documentation/x86/x86_64/mm.txt Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Masami Hiramatsu <mhiramat@kernel.org> Cc: x86@kernel.org Link: https://lore.kernel.org/bpf/eefeefd769aa5a013531f491a71f0936779e916b.1572649915.git.daniel@iogearbox.net		2019-11-02 12:39:12 -07:00
..
kasan	mm: introduce compound_nr()	2019-09-24 15:54:08 -07:00
backing-dev.c	bdi: Do not use freezable workqueue	2019-10-06 09:11:35 -06:00
balloon_compaction.c
cleancache.c
cma_debug.c
cma.c
cma.h
compaction.c	mm, compaction: fix wrong pfn handling in __reset_isolation_pfn()	2019-10-14 15:04:01 -07:00
debug_page_ref.c
debug.c
dmapool.c
early_ioremap.c
fadvise.c
failslab.c
filemap.c	mm/filemap.c: include <linux/ramfs.h> for generic_file_vm_ops definition	2019-10-19 06:32:32 -04:00
frame_vector.c	mm: untag user pointers in get_vaddr_frames	2019-09-25 17:51:41 -07:00
frontswap.c
gup_benchmark.c
gup.c	mm/gup: fix a misnamed "write" argument, and a related bug	2019-10-19 06:32:32 -04:00
highmem.c
hmm.c
huge_memory.c	mm/thp: fix node page state in split_huge_page_to_list()	2019-10-19 06:32:32 -04:00
hugetlb_cgroup.c	mm: introduce compound_nr()	2019-09-24 15:54:08 -07:00
hugetlb.c	hugetlbfs: don't access uninitialized memmaps in pfn_range_valid_gigantic()	2019-10-19 06:32:32 -04:00
hwpoison-inject.c
init-mm.c	mm/init-mm.c: include <linux/mman.h> for vm_committed_as_batch	2019-10-19 06:32:32 -04:00
internal.h	mm: introduce MADV_COLD	2019-09-25 17:51:41 -07:00
interval_tree.c
Kconfig	mm,thp: add read-only THP support for (non-shmem) FS	2019-09-24 15:54:11 -07:00
Kconfig.debug	mm, page_owner, debug_pagealloc: save and dump freeing stack trace	2019-09-24 15:54:08 -07:00
khugepaged.c	khugepaged: enable collapse pmd for pte-mapped THP	2019-09-24 15:54:11 -07:00
kmemleak-test.c
kmemleak.c	kmemleak: Do not corrupt the object_list during clean-up	2019-10-14 08:56:16 -07:00
ksm.c	mm: move memcmp_pages() and pages_identical()	2019-09-24 15:54:11 -07:00
list_lru.c
maccess.c	uaccess: Add strict non-pagefault kernel-space read function	2019-11-02 12:39:12 -07:00
madvise.c	mm: factor out common parts between MADV_COLD and MADV_PAGEOUT	2019-09-25 17:51:41 -07:00
Makefile	mm: silence -Woverride-init/initializer-overrides	2019-09-24 15:54:10 -07:00
memblock.c	mm: memblock: do not enforce current limit for memblock_phys* family	2019-10-19 06:32:32 -04:00
memcontrol.c	mm/memcontrol: update lruvec counters in mem_cgroup_move_account	2019-10-19 06:32:32 -04:00
memfd.c	mm: page cache: store only head pages in i_pages	2019-09-24 15:54:08 -07:00
memory_hotplug.c	mm/memory_hotplug: don't access uninitialized memmaps in shrink_pgdat_span()	2019-10-19 06:32:31 -04:00
memory-failure.c	mm/memory-failure.c: don't access uninitialized memmaps in memory_failure()	2019-10-19 06:32:31 -04:00
memory.c	mm: do not hash address in print_bad_pte()	2019-09-24 15:54:09 -07:00
mempolicy.c	Merge branch 'hugepage-fallbacks' (hugepatch patches from David Rientjes)	2019-09-28 14:26:47 -07:00
mempool.c
memremap.c	mm/memunmap: don't access uninitialized memmap in memunmap_pages()	2019-10-19 06:32:32 -04:00
memtest.c
migrate.c	mm: untag user pointers passed to memory syscalls	2019-09-25 17:51:41 -07:00
mincore.c	mm: untag user pointers passed to memory syscalls	2019-09-25 17:51:41 -07:00
mlock.c	mm: untag user pointers passed to memory syscalls	2019-09-25 17:51:41 -07:00
mm_init.c
mmap.c	mm: untag user pointers in mmap/munmap/mremap/brk	2019-09-25 17:51:41 -07:00
mmu_context.c
mmu_gather.c	mm: remove quicklist page table caches	2019-09-24 15:54:09 -07:00
mmu_notifier.c
mmzone.c
mprotect.c	mm: untag user pointers passed to memory syscalls	2019-09-25 17:51:41 -07:00
mremap.c	mm: untag user pointers in mmap/munmap/mremap/brk	2019-09-25 17:51:41 -07:00
msync.c	mm: untag user pointers passed to memory syscalls	2019-09-25 17:51:41 -07:00
nommu.c	mm: introduce page_size()	2019-09-24 15:54:08 -07:00
oom_kill.c	mm: introduce MADV_COLD	2019-09-25 17:51:41 -07:00
page_alloc.c	mm, hugetlb: allow hugepage allocations to reclaim as needed	2019-10-14 15:04:01 -07:00
page_counter.c
page_ext.c	mm, page_owner: fix off-by-one error in __set_page_owner_handle()	2019-10-14 15:04:00 -07:00
page_idle.c
page_io.c
page_isolation.c
page_owner.c	mm/page_owner: don't access uninitialized memmaps when reading /proc/pagetypeinfo	2019-10-19 06:32:31 -04:00
page_poison.c	mm/page_poison.c: fix a typo in a comment	2019-09-24 15:54:08 -07:00
page_vma_mapped.c	mm: introduce page_size()	2019-09-24 15:54:08 -07:00
page-writeback.c
pagewalk.c
percpu-internal.h
percpu-km.c
percpu-stats.c
percpu-vm.c
percpu.c
pgtable-generic.c
process_vm_access.c
readahead.c
rmap.c	mm: include <linux/huge_mm.h> for is_vma_temporary_stack	2019-10-19 06:32:32 -04:00
rodata_test.c
shmem.c	Merge branch 'work.mount3' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2019-10-10 08:16:44 -07:00
shuffle.c	mm: fix -Wmissing-prototypes warnings	2019-10-07 15:47:19 -07:00
shuffle.h
slab_common.c	mm: memcg/slab: fix panic in __free_slab() caused by premature memcg pointer release	2019-10-19 06:32:32 -04:00
slab.c	mm/slab.c: fix kernel-doc warning for __ksize()	2019-10-14 15:04:01 -07:00
slab.h	mm, slab: move memcg_cache_params structure to mm/slab.h	2019-09-24 15:54:07 -07:00
slob.c	mm, sl[aou]b: guarantee natural alignment for kmalloc(power-of-two)	2019-10-07 15:47:20 -07:00
slub.c	mm/slub.c: init_on_free=1 should wipe freelist ptr for bulk allocations	2019-10-14 15:04:01 -07:00
sparse-vmemmap.c
sparse.c	mm: fix -Wmissing-prototypes warnings	2019-10-07 15:47:19 -07:00
swap_cgroup.c
swap_slots.c
swap_state.c	mm: page cache: store only head pages in i_pages	2019-09-24 15:54:08 -07:00
swap.c	mm: introduce MADV_COLD	2019-09-25 17:51:41 -07:00
swapfile.c
truncate.c	mm/thp: allow dropping THP from page cache	2019-10-19 06:32:33 -04:00
usercopy.c
userfaultfd.c
util.c	arm64, mm: make randomization selected by generic topdown mmap layout	2019-09-24 15:54:11 -07:00
vmacache.c
vmalloc.c	augmented rbtree: add new RB_DECLARE_CALLBACKS_MAX macro	2019-09-25 17:51:39 -07:00
vmpressure.c	mm/vmpressure.c: fix a signedness bug in vmpressure_register_event()	2019-10-07 15:47:19 -07:00
vmscan.c	mm/vmscan.c: support removing arbitrary sized pages from mapping	2019-10-19 06:32:32 -04:00
vmstat.c	mm,thp: stats for file backed THP	2019-09-24 15:54:11 -07:00
workingset.c
z3fold.c	mm/z3fold.c: claim page in the beginning of free	2019-10-07 15:47:19 -07:00
zbud.c
zpool.c	zpool: add malloc_support_movable to zpool_driver	2019-09-24 15:54:12 -07:00
zsmalloc.c	mm/zsmalloc.c: fix a -Wunused-function warning	2019-09-24 15:54:12 -07:00
zswap.c	zswap: do not map same object twice	2019-09-24 15:54:12 -07:00