linux-toradex.git/mm, branch v6.2-rc3

memblock: Fix doc for memblock_phys_free

2023-01-04T10:31:22+00:00

memblock_phys_free() is the counterpart to memblock_phys_alloc.
Change memblock_alloc_xx() with memblock_phys_alloc_xx() to keep
consistency.

Signed-off-by: Miaoqian Lin 
Link: https://lore.kernel.org/r/20221216100304.688209-1-linmq006@gmail.com
Signed-off-by: Mike Rapoport (IBM)

hugetlb: really allocate vma lock for all sharable vmas

2022-12-21T22:31:52+00:00

Commit bbff39cc6cbc ("hugetlb: allocate vma lock for all sharable vmas")
removed the pmd sharable checks in the vma lock helper routines.  However,
it left the functional version of helper routines behind #ifdef
CONFIG_ARCH_WANT_HUGE_PMD_SHARE.  Therefore, the vma lock is not being
used for sharable vmas on architectures that do not support pmd sharing. 
On these architectures, a potential fault/truncation race is exposed that
could leave pages in a hugetlb file past i_size until the file is removed.

Move the functional vma lock helpers outside the ifdef, and remove the
non-functional stubs.  Since the vma lock is not just for pmd sharing,
rename the routine __vma_shareable_flags_pmd.

Link: https://lkml.kernel.org/r/20221212235042.178355-1-mike.kravetz@oracle.com
Fixes: bbff39cc6cbc ("hugetlb: allocate vma lock for all sharable vmas")
Signed-off-by: Mike Kravetz 
Reviewed-by: Miaohe Lin 
Cc: "Aneesh Kumar K.V" 
Cc: David Hildenbrand 
Cc: James Houghton 
Cc: Mina Almasry 
Cc: Muchun Song 
Cc: Naoya Horiguchi 
Cc: Peter Xu 
Cc: 
Signed-off-by: Andrew Morton

kmsan: export kmsan_handle_urb

2022-12-21T22:31:52+00:00

USB support can be in a loadable module, and this causes a link failure
with KMSAN:

ERROR: modpost: "kmsan_handle_urb" [drivers/usb/core/usbcore.ko] undefined!

Export the symbol so it can be used by this module.

Link: https://lkml.kernel.org/r/20221215162710.3802378-1-arnd@kernel.org
Fixes: 553a80188a5d ("kmsan: handle memory sent to/from USB")
Signed-off-by: Arnd Bergmann 
Reviewed-by: Alexander Potapenko 
Cc: Dmitry Vyukov 
Cc: Marco Elver 
Cc: 
Signed-off-by: Andrew Morton

kmsan: include linux/vmalloc.h

2022-12-21T22:31:51+00:00

This is needed for the vmap/vunmap declarations:

mm/kmsan/kmsan_test.c:316:9: error: implicit declaration of function 'vmap' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
        vbuf = vmap(pages, npages, VM_MAP, PAGE_KERNEL);
               ^
mm/kmsan/kmsan_test.c:316:29: error: use of undeclared identifier 'VM_MAP'
        vbuf = vmap(pages, npages, VM_MAP, PAGE_KERNEL);
                                   ^
mm/kmsan/kmsan_test.c:322:3: error: implicit declaration of function 'vunmap' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
                vunmap(vbuf);
                ^

Link: https://lkml.kernel.org/r/20221215163046.4079767-1-arnd@kernel.org
Fixes: 8ed691b02ade ("kmsan: add tests for KMSAN")
Signed-off-by: Arnd Bergmann 
Reviewed-by: Alexander Potapenko 
Cc: Dmitry Vyukov 
Cc: Marco Elver 
Cc: 
Signed-off-by: Andrew Morton

mm/mempolicy: fix memory leak in set_mempolicy_home_node system call

2022-12-21T22:31:51+00:00

When encountering any vma in the range with policy other than MPOL_BIND or
MPOL_PREFERRED_MANY, an error is returned without issuing a mpol_put on
the policy just allocated with mpol_dup().

This allows arbitrary users to leak kernel memory.

Link: https://lkml.kernel.org/r/20221215194621.202816-1-mathieu.desnoyers@efficios.com
Fixes: c6018b4b2549 ("mm/mempolicy: add set_mempolicy_home_node syscall")
Signed-off-by: Mathieu Desnoyers 
Reviewed-by: Randy Dunlap 
Reviewed-by: "Huang, Ying" 
Reviewed-by: Aneesh Kumar K.V 
Acked-by: Michal Hocko 
Cc: Aneesh Kumar K.V 
Cc: Dave Hansen 
Cc: Feng Tang 
Cc: Michal Hocko 
Cc: Andrea Arcangeli 
Cc: Mel Gorman 
Cc: Mike Kravetz 
Cc: Randy Dunlap 
Cc: Vlastimil Babka 
Cc: Andi Kleen 
Cc: Dan Williams 
Cc: Huang Ying 
Cc: 	[5.17+]
Signed-off-by: Andrew Morton

mm, mremap: fix mremap() expanding vma with addr inside vma

2022-12-21T22:31:51+00:00

Since 6.1 we have noticed random rpm install failures that were tracked to
mremap() returning -ENOMEM and to commit ca3d76b0aa80 ("mm: add merging
after mremap resize").

The problem occurs when mremap() expands a VMA in place, but using an
starting address that's not vma->vm_start, but somewhere in the middle. 
The extension_pgoff calculation introduced by the commit is wrong in that
case, so vma_merge() fails due to pgoffs not being compatible.  Fix the
calculation.

By the way it seems that the situations, where rpm now expands a vma from
the middle, were made possible also due to that commit, thanks to the
improved vma merging.  Yet it should work just fine, except for the buggy
calculation.

Link: https://lkml.kernel.org/r/20221216163227.24648-1-vbabka@suse.cz
Reported-by: Jiri Slaby 
  Link: https://bugzilla.suse.com/show_bug.cgi?id=1206359
Fixes: ca3d76b0aa80 ("mm: add merging after mremap resize")
Signed-off-by: Vlastimil Babka 
Cc: Jakub Matěna 
Cc: "Kirill A . Shutemov" 
Cc: Liam Howlett 
Cc: Matthew Wilcox 
Cc: Mel Gorman 
Cc: Michal Hocko 
Cc: 
Signed-off-by: Andrew Morton

Merge tag 'mm-stable-2022-12-17-2' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

2022-12-19T12:58:57+00:00

Pull more mm updates from Andrew Morton:

 - A few late-breaking minor fixups

 - Two minor feature patches which were awkwardly dependent on mm-nonmm.
   I need to set up a new branch to handle such things.

* tag 'mm-stable-2022-12-17-2' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm:
  MAINTAINERS: zram: zsmalloc: Add an additional co-maintainer
  mm/kmemleak: use %pK to display kernel pointers in backtrace
  mm: use stack_depot for recording kmemleak's backtrace
  maple_tree: update copyright dates for test code
  maple_tree: fix mas_find_rev() comment
  mm/gup_test: free memory allocated via kvcalloc() using kvfree()

Merge tag 'x86_mm_for_6.2_v2' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2022-12-17T20:06:53+00:00

Pull x86 mm updates from Dave Hansen:
 "New Feature:

   - Randomize the per-cpu entry areas

  Cleanups:

   - Have CR3_ADDR_MASK use PHYSICAL_PAGE_MASK instead of open coding it

   - Move to "native" set_memory_rox() helper

   - Clean up pmd_get_atomic() and i386-PAE

   - Remove some unused page table size macros"

* tag 'x86_mm_for_6.2_v2' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (35 commits)
  x86/mm: Ensure forced page table splitting
  x86/kasan: Populate shadow for shared chunk of the CPU entry area
  x86/kasan: Add helpers to align shadow addresses up and down
  x86/kasan: Rename local CPU_ENTRY_AREA variables to shorten names
  x86/mm: Populate KASAN shadow for entire per-CPU range of CPU entry area
  x86/mm: Recompute physical address for every page of per-CPU CEA mapping
  x86/mm: Rename __change_page_attr_set_clr(.checkalias)
  x86/mm: Inhibit _PAGE_NX changes from cpa_process_alias()
  x86/mm: Untangle __change_page_attr_set_clr(.checkalias)
  x86/mm: Add a few comments
  x86/mm: Fix CR3_ADDR_MASK
  x86/mm: Remove P*D_PAGE_MASK and P*D_PAGE_SIZE macros
  mm: Convert __HAVE_ARCH_P..P_GET to the new style
  mm: Remove pointless barrier() after pmdp_get_lockless()
  x86/mm/pae: Get rid of set_64bit()
  x86_64: Remove pointless set_64bit() usage
  x86/mm/pae: Be consistent with pXXp_get_and_clear()
  x86/mm/pae: Use WRITE_ONCE()
  x86/mm/pae: Don't (ab)use atomic64
  mm/gup: Fix the lockless PMD access
  ...

mm/kmemleak: use %pK to display kernel pointers in backtrace

2022-12-16T00:37:49+00:00

Currently, %p is used to display kernel pointers in backtrace which result
in a hashed value that is not usable to correlate the address for debug. 
Use %pK which will respect the kptr_restrict configuration value and thus
allow to extract meaningful information from the backtrace.

Link: https://lkml.kernel.org/r/20221108094322.73492-1-clement.leger@bootlin.com
Signed-off-by: Clément Léger 
Cc: Alexandre Belloni 
Cc: Catalin Marinas 
Cc: Thomas Petazzoni 
Signed-off-by: Andrew Morton

mm: use stack_depot for recording kmemleak's backtrace

2022-12-16T00:37:49+00:00

Using stack_depot to record kmemleak's backtrace which has been
implemented on slub for reducing redundant information.

[akpm@linux-foundation.org: fix build - remove now-unused __save_stack_trace()]
[zhaoyang.huang@unisoc.com: v3]
  Link: https://lkml.kernel.org/r/1667101354-4669-1-git-send-email-zhaoyang.huang@unisoc.com
[akpm@linux-foundation.org: fix v3 layout oddities]
[akpm@linux-foundation.org: coding-style cleanups]
Link: https://lkml.kernel.org/r/1666864224-27541-1-git-send-email-zhaoyang.huang@unisoc.com
Signed-off-by: Zhaoyang Huang 
Acked-by: Catalin Marinas 
Cc: ke.wang 
Cc: Matthew Wilcox (Oracle) 
Cc: Vlastimil Babka 
Cc: Zhaoyang Huang 
Signed-off-by: Andrew Morton