Dmitry Safonov
b059a453b1
x86/vdso: Add mremap hook to vm_special_mapping ...
Add possibility for 32-bit user-space applications to move
the vDSO mapping.
Previously, when a user-space app called mremap() for the vDSO
address, in the syscall return path it would land on the previous
address of the vDSOpage, resulting in segmentation violation.
Now it lands fine and returns to userspace with a remapped vDSO.
This will also fix the context.vdso pointer for 64-bit, which does
not affect the user of vDSO after mremap() currently, but this
may change in the future.
As suggested by Andy, return -EINVAL for mremap() that would
split the vDSO image: that operation cannot possibly result in
a working system so reject it.
Renamed and moved the text_mapping structure declaration inside
map_vdso(), as it used only there and now it complements the
vvar_mapping variable.
There is still a problem for remapping the vDSO in glibc
applications: the linker relocates addresses for syscalls
on the vDSO page, so you need to relink with the new
addresses.
Without that the next syscall through glibc may fail:
Program received signal SIGSEGV, Segmentation fault.
#0 0xf7fd9b80 in __kernel_vsyscall ()
#1 0xf7ec8238 in _exit () from /usr/lib32/libc.so.6
Signed-off-by: Dmitry Safonov <dsafonov@virtuozzo.com>
Acked-by: Andy Lutomirski <luto@kernel.org>
Cc: 0x7f454c46@gmail.com
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-mm@kvack.org
Link: http://lkml.kernel.org/r/20160628113539.13606-2-dsafonov@virtuozzo.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2016-07-08 14:17:51 +02:00
mm: mempool: kasan: don't poot mempool objects in quarantine
2016-06-24 17:23:52 -07:00
mm: throttle on IO only when there are too many dirty and writeback pages
2016-05-20 17:58:30 -07:00
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial
2016-03-17 21:38:27 -07:00
mm: convert printk(KERN_<LEVEL> to pr_<level>
2016-03-17 15:09:34 -07:00
cleancache: constify cleancache_ops structure
2016-01-27 09:09:57 -05:00
mm/cma: silence warnings due to max() usage
2016-05-27 14:49:37 -07:00
mm, compaction: abort free scanner if split fails
2016-06-24 17:23:52 -07:00
mm: introduce page reference manipulation functions
2016-03-17 15:09:34 -07:00
mm/page_ref: add tracepoint to track down page reference manipulation
2016-03-17 15:09:34 -07:00
mm: convert printk(KERN_<LEVEL> to pr_<level>
2016-03-17 15:09:34 -07:00
mm/fadvise.c: do not discard partial pages with POSIX_FADV_DONTNEED
2016-06-09 14:23:11 -07:00
mm: fault-inject take over bootstrap kmem_cache check
2016-03-15 16:55:16 -07:00
Revert "mm: make faultaround produce old ptes"
2016-06-24 17:23:52 -07:00
mm/gup: Switch all callers of get_user_pages() to not pass tsk/mm
2016-02-16 10:11:12 +01:00
Merge branch 'mm-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2016-04-14 19:31:34 -07:00
mm/highmem: make nr_free_highpages() handles all highmem zones by itself
2016-05-19 19:12:14 -07:00
libnvdimm for 4.7
2016-05-23 11:18:01 -07:00
mm/hugetlb: clear compound_mapcount when freeing gigantic pages
2016-06-24 17:23:52 -07:00
mm, hugetlb_cgroup: round limit_in_bytes down to hugepage size
2016-05-20 17:58:30 -07:00
mm, sl[au]b: add __GFP_ATOMIC to the GFP reclaim mask
2016-06-24 17:23:52 -07:00
mm: disable DEFERRED_STRUCT_PAGE_INIT on !NO_BOOTMEM
2016-05-27 14:49:37 -07:00
mm/page_ref: add tracepoint to track down page reference manipulation
2016-03-17 15:09:34 -07:00
mm: convert printk(KERN_<LEVEL> to pr_<level>
2016-03-17 15:09:34 -07:00
mm: convert printk(KERN_<LEVEL> to pr_<level>
2016-03-17 15:09:34 -07:00
mm: prevent KASAN false positives in kmemleak
2016-06-24 17:23:52 -07:00
ksm: fix conflict between mmput and scan_get_next_rmap_item
2016-05-12 15:52:50 -07:00
mm: memcontrol: move kmem accounting code to CONFIG_MEMCG
2016-01-20 17:09:18 -08:00
x86: remove more uaccess_32.h complexity
2016-05-22 17:21:27 -07:00
mm: make mmap_sem for write waits killable for mm syscalls
2016-05-23 17:04:14 -07:00
z3fold: the 3-fold allocator for compressed pages
2016-05-20 17:58:30 -07:00
mm/memblock.c: remove unnecessary always-true comparison
2016-05-20 17:58:30 -07:00
memcg: css_alloc should return an ERR_PTR value on error
2016-06-24 17:23:52 -07:00
mm/memory-failure.c: replace "MCE" with "Memory failure"
2016-05-20 17:58:30 -07:00
Revert "mm: disable fault around on emulated access bit architecture"
2016-06-24 17:23:52 -07:00
mm: fix section mismatch warning
2016-05-27 15:23:32 -07:00
mm, page_alloc: avoid looking up the first zone in a zonelist twice
2016-05-19 19:12:14 -07:00
mm: mempool: kasan: don't poot mempool objects in quarantine
2016-06-24 17:23:52 -07:00
mm: Export migrate_page_move_mapping and migrate_page_copy
2016-06-23 00:29:45 +02:00
mm, fs: remove remaining PAGE_CACHE_* and page_cache_{get,release} usage
2016-04-04 10:41:08 -07:00
mm: make mmap_sem for write waits killable for mm syscalls
2016-05-23 17:04:14 -07:00
mm: convert printk(KERN_<LEVEL> to pr_<level>
2016-03-17 15:09:34 -07:00
x86/vdso: Add mremap hook to vm_special_mapping
2016-07-08 14:17:51 +02:00
mm/mmu_context, sched/core: Fix mmu_context.h assumption
2016-04-28 11:44:19 +02:00
fix Christoph's email addresses
2016-03-17 15:09:34 -07:00
mm, page_alloc: inline the fast path of the zonelist iterator
2016-05-19 19:12:14 -07:00
mm: make mmap_sem for write waits killable for mm syscalls
2016-05-23 17:04:14 -07:00
mm: make mmap_sem for write waits killable for mm syscalls
2016-05-23 17:04:14 -07:00
mm: convert printk(KERN_<LEVEL> to pr_<level>
2016-03-17 15:09:34 -07:00
mm: remove more IS_ERR_VALUE abuses
2016-05-27 15:57:31 -07:00
oom_reaper: avoid pointless atomic_inc_not_zero usage.
2016-06-24 17:23:52 -07:00
writeback: use higher precision calculation in domain_dirty_limits()
2016-05-30 08:54:40 -06:00
mm, page_alloc: recalculate the preferred zoneref if the context can ignore memory policies
2016-06-03 16:02:57 -07:00
mm: use early_pfn_to_nid in page_ext_init
2016-05-27 14:49:37 -07:00
mm: add page_check_address_transhuge() helper
2016-01-15 17:56:32 -08:00
Merge branch 'work.preadv2' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2016-05-17 15:05:23 -07:00
mm/memory_hotplug: add comment to some functions related to memory hotplug
2016-05-19 19:12:14 -07:00
mm/page_owner: avoid null pointer dereference
2016-06-24 17:23:52 -07:00
mm: check the return value of lookup_page_ext for all call sites
2016-06-03 15:06:22 -07:00
thp: rename split_huge_page_pmd() to split_huge_pmd()
2016-01-15 17:56:32 -08:00
mm: percpu: use pr_fmt to prefix output
2016-03-17 15:09:34 -07:00
percpu: fix synchronization between synchronous map extension and chunk destruction
2016-05-25 11:48:25 -04:00
mm/thp/migration: switch from flush_tlb_range to flush_pmd_tlb_range
2016-03-17 15:09:34 -07:00
mm/gup: Introduce get_user_pages_remote()
2016-02-16 10:04:09 +01:00
fix Christoph's email addresses
2016-03-17 15:09:34 -07:00
mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros
2016-04-04 10:41:08 -07:00
mm: thp: avoid false positive VM_BUG_ON_PAGE in page_move_anon_rmap()
2016-05-27 14:49:37 -07:00
tmpfs: don't undo fallocate past its last page
2016-06-24 17:23:52 -07:00
mm, kasan: don't call kasan_krealloc() from ksize().
2016-05-20 17:58:30 -07:00
mm: kasan: initial memory quarantine implementation
2016-05-20 17:58:30 -07:00
mm: kasan: initial memory quarantine implementation
2016-05-20 17:58:30 -07:00
mm: slab: free kmem_cache_node after destroy sysfs file
2016-02-18 16:23:24 -08:00
mm, kasan: don't call kasan_krealloc() from ksize().
2016-05-20 17:58:30 -07:00
mm: convert printk(KERN_<LEVEL> to pr_<level>
2016-03-17 15:09:34 -07:00
mm: convert printk(KERN_<LEVEL> to pr_<level>
2016-03-17 15:09:34 -07:00
mm/swap.c: flush lru pvecs on compound page arrival
2016-06-24 17:23:52 -07:00
mm: convert printk(KERN_<LEVEL> to pr_<level>
2016-03-17 15:09:34 -07:00
mm: thp: broken page count after commit aa88b68c3b
2016-06-09 14:23:11 -07:00
mm: thp: calculate the mapcount correctly for THP pages during WP faults
2016-05-12 15:52:50 -07:00
dax: New fault locking
2016-05-19 15:20:54 -06:00
mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros
2016-04-04 10:41:08 -07:00
mm: make vm_mmap killable
2016-05-23 17:04:14 -07:00
mm: fix overflow in vm_map_ram()
2016-06-03 15:06:22 -07:00
mm/vmpressure.c: fix subtree pressure detection
2016-02-03 08:28:43 -08:00
mm, oom: rework oom detection
2016-05-20 17:58:30 -07:00
mm: check the return value of lookup_page_ext for all call sites
2016-06-03 15:06:22 -07:00
mm: workingset: make shadow node shrinker memcg aware
2016-03-17 15:09:34 -07:00
mm/z3fold.c: avoid modifying HEADLESS page and minor cleanup
2016-06-03 16:02:55 -07:00
mm/zbud.c: use list_last_entry() instead of list_tail_entry()
2016-01-15 11:40:52 -08:00
update "mm/zsmalloc: don't fail if can't create debugfs info"
2016-05-26 15:35:44 -07:00
mm/zswap: use workqueue to destroy pool
2016-05-20 17:58:30 -07:00
b059a453b1