Laura Abbott aa4f060111 mm: usercopy: Check for module addresses ... While running a compile on arm64, I hit a memory exposure usercopy: kernel memory exposure attempt detected from fffffc0000f3b1a8 (buffer_head) (1 bytes) ------------[ cut here ]------------ kernel BUG at mm/usercopy.c:75! Internal error: Oops - BUG: 0 [#1] SMP Modules linked in: ip6t_rpfilter ip6t_REJECT nf_reject_ipv6 xt_conntrack ip_set nfnetlink ebtable_broute bridge stp llc ebtable_nat ip6table_security ip6table_raw ip6table_nat nf_conntrack_ipv6 nf_defrag_ipv6 nf_nat_ipv6 ip6table_mangle iptable_security iptable_raw iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack iptable_mangle ebtable_filter ebtables ip6table_filter ip6_tables vfat fat xgene_edac xgene_enet edac_core i2c_xgene_slimpro i2c_core at803x realtek xgene_dma mdio_xgene gpio_dwapb gpio_xgene_sb xgene_rng mailbox_xgene_slimpro nfsd auth_rpcgss nfs_acl lockd grace sunrpc xfs libcrc32c sdhci_of_arasan sdhci_pltfm sdhci mmc_core xhci_plat_hcd gpio_keys CPU: 0 PID: 19744 Comm: updatedb Tainted: G W 4.8.0-rc3-threadinfo+ #1 Hardware name: AppliedMicro X-Gene Mustang Board/X-Gene Mustang Board, BIOS 3.06.12 Aug 12 2016 task: fffffe03df944c00 task.stack: fffffe00d128c000 PC is at __check_object_size+0x70/0x3f0 LR is at __check_object_size+0x70/0x3f0 ... [<fffffc00082b4280>] __check_object_size+0x70/0x3f0 [<fffffc00082cdc30>] filldir64+0x158/0x1a0 [<fffffc0000f327e8>] __fat_readdir+0x4a0/0x558 [fat] [<fffffc0000f328d4>] fat_readdir+0x34/0x40 [fat] [<fffffc00082cd8f8>] iterate_dir+0x190/0x1e0 [<fffffc00082cde58>] SyS_getdents64+0x88/0x120 [<fffffc0008082c70>] el0_svc_naked+0x24/0x28 fffffc0000f3b1a8 is a module address. Modules may have compiled in strings which could get copied to userspace. In this instance, it looks like "." which matches with a size of 1 byte. Extend the is_vmalloc_addr check to be is_vmalloc_or_module_addr to cover all possible cases. Signed-off-by: Laura Abbott <labbott@redhat.com> Signed-off-by: Kees Cook <keescook@chromium.org>		2016-09-20 16:07:39 -07:00
..
kasan	kasan: remove the unnecessary WARN_ONCE from quarantine.c	2016-08-11 16:58:14 -07:00
backing-dev.c	block: fix bdi vs gendisk lifetime mismatch	2016-08-04 14:19:16 -06:00
balloon_compaction.c
bootmem.c
cleancache.c
cma.c
cma.h
cma_debug.c
compaction.c	mm, compaction: simplify contended compaction handling	2016-07-28 16:07:41 -07:00
debug.c	mm: avoid endless recursion in dump_page()	2016-09-19 15:36:16 -07:00
debug_page_ref.c
dmapool.c
early_ioremap.c
fadvise.c
failslab.c
filemap.c	block/mm: make bdev_ops->rw_page() take a bool for read/write	2016-08-07 14:41:02 -06:00
frame_vector.c
frontswap.c	mm, frontswap: convert frontswap_enabled to static key	2016-07-26 16:19:19 -07:00
gup.c	- ARM: GICv3 ITS emulation and various fixes. Removal of the old	2016-08-02 16:11:27 -04:00
highmem.c
huge_memory.c	mm: fix show_smap() for zone_device-pmd ranges	2016-09-09 17:34:45 -07:00
hugetlb.c	mm/hugetlb: fix incorrect hugepages count during mem hotplug	2016-08-11 16:58:13 -07:00
hugetlb_cgroup.c
hwpoison-inject.c
init-mm.c
internal.h	mm, compaction: simplify contended compaction handling	2016-07-28 16:07:41 -07:00
interval_tree.c
Kconfig	mm: clarify COMPACTION Kconfig text	2016-08-26 17:39:35 -07:00
Kconfig.debug
khugepaged.c	mm, thp: fix leaking mapped pte in __collapse_huge_page_swapin()	2016-09-19 15:36:16 -07:00
kmemcheck.c
kmemleak-test.c
kmemleak.c	kmemleak: don't hang if user disables scanning early	2016-07-28 16:07:41 -07:00
ksm.c	mm: do not pass mm_struct into handle_mm_fault	2016-07-26 16:19:19 -07:00
list_lru.c
maccess.c
madvise.c
Makefile	Implements HARDENED_USERCOPY verification of copy_to_user/copy_from_user	2016-08-08 14:48:14 -07:00
memblock.c	mm/memblock.c: fix NULL dereference error	2016-08-04 20:02:09 -04:00
memcontrol.c	mm: memcontrol: make per-cpu charge cache IRQ-safe for socket accounting	2016-09-19 15:36:17 -07:00
memory-failure.c	mm: hwpoison: remove incorrect comments	2016-07-28 16:07:41 -07:00
memory.c	mm: move swap-in anonymous page into active list	2016-08-02 17:31:41 -04:00
memory_hotplug.c	mem-hotplug: don't clear the only node in new_node_page()	2016-09-19 15:36:16 -07:00
mempolicy.c	mm, mempolicy: task->mempolicy must be NULL before dropping final reference	2016-09-01 17:52:01 -07:00
mempool.c	Revert "mm, mempool: only set __GFP_NOMEMALLOC if there are free elements"	2016-07-28 16:07:41 -07:00
memtest.c
migrate.c	mm, thp: remove __GFP_NORETRY from khugepaged and madvised allocations	2016-07-28 16:07:41 -07:00
mincore.c
mlock.c	mm, vmscan: move LRU lists to node	2016-07-28 16:07:41 -07:00
mm_init.c
mmap.c	mm: refuse wrapped vm_brk requests	2016-08-02 19:35:15 -04:00
mmu_context.c
mmu_notifier.c
mmzone.c
mprotect.c	mm: thp: check pmd_trans_unstable() after split_huge_pmd()	2016-07-26 16:19:19 -07:00
mremap.c	mm: thp: check pmd_trans_unstable() after split_huge_pmd()	2016-07-26 16:19:19 -07:00
msync.c
nobootmem.c
nommu.c	mm: introduce fault_env	2016-07-26 16:19:19 -07:00
oom_kill.c	mm, oom: fix uninitialized ret in task_will_free_mem()	2016-08-11 16:58:14 -07:00
page-writeback.c	mm: remove reclaim and compaction retry approximations	2016-07-28 16:07:41 -07:00
page_alloc.c	mm, vmscan: only allocate and reclaim from zones with pages managed by the buddy allocator	2016-09-01 17:52:01 -07:00
page_counter.c
page_ext.c
page_idle.c	mm, vmscan: move lru_lock to the node	2016-07-28 16:07:41 -07:00
page_io.c	mm: fix the page_swap_info() BUG_ON check	2016-09-19 15:36:17 -07:00
page_isolation.c	mm/page_isolation: clean up confused code	2016-07-26 16:19:19 -07:00
page_owner.c	mm/page_owner: use stackdepot to store stacktrace	2016-07-26 16:19:19 -07:00
page_poison.c
pagewalk.c
percpu-km.c
percpu-vm.c
percpu.c
pgtable-generic.c
process_vm_access.c
quicklist.c
readahead.c	mm: silently skip readahead for DAX inodes	2016-08-26 17:39:35 -07:00
rmap.c	rmap: fix compound check logic in page_remove_file_rmap	2016-08-10 16:40:56 -07:00
shmem.c	thp: move shmem_huge_enabled() outside of SYSFS ifdef	2016-08-10 16:40:56 -07:00
slab.c	Implements HARDENED_USERCOPY verification of copy_to_user/copy_from_user	2016-08-08 14:48:14 -07:00
slab.h	mm, kasan: switch SLUB to stackdepot, enable memory quarantine for SLUB	2016-07-28 16:07:41 -07:00
slab_common.c	mm: charge/uncharge kmemcg from generic page allocator paths	2016-07-26 16:19:19 -07:00
slob.c
slub.c	mm/slub.c: run free_partial() outside of the kmem_cache_node->list_lock	2016-08-10 16:40:56 -07:00
sparse-vmemmap.c	treewide: replace obsolete _refok by __ref	2016-08-02 17:31:41 -04:00
sparse.c	treewide: replace obsolete _refok by __ref	2016-08-02 17:31:41 -04:00
swap.c	mm, pagevec: release/reacquire lru_lock on pgdat change	2016-07-28 16:07:41 -07:00
swap_cgroup.c
swap_state.c	mm: move most file-based accounting to the node	2016-07-28 16:07:41 -07:00
swapfile.c	mm: fix the page_swap_info() BUG_ON check	2016-09-19 15:36:17 -07:00
truncate.c	truncate: handle file thp	2016-07-26 16:19:19 -07:00
usercopy.c	mm: usercopy: Check for module addresses	2016-09-20 16:07:39 -07:00
userfaultfd.c
util.c	mm: move most file-based accounting to the node	2016-07-28 16:07:41 -07:00
vmacache.c
vmalloc.c	mm: charge/uncharge kmemcg from generic page allocator paths	2016-07-26 16:19:19 -07:00
vmpressure.c
vmscan.c	mm, vmscan: only allocate and reclaim from zones with pages managed by the buddy allocator	2016-09-01 17:52:01 -07:00
vmstat.c	mm: remove reclaim and compaction retry approximations	2016-07-28 16:07:41 -07:00
workingset.c	mm, workingset: make working set detection node-aware	2016-07-28 16:07:41 -07:00
z3fold.c
zbud.c
zpool.c
zsmalloc.c	zsmalloc: Delete an unnecessary check before the function call "iput"	2016-07-28 16:07:41 -07:00
zswap.c