linux-stable/include
Zi Yan 5708d96da2 mm: avoid zeroing user movable page twice with init_on_alloc=1
Commit 6471384af2 ("mm: security: introduce init_on_alloc=1 and
init_on_free=1 boot options") forces allocated page to be zeroed in
post_alloc_hook() when init_on_alloc=1.

For order-0 folios, if arch does not define
vma_alloc_zeroed_movable_folio(), the default implementation again zeros
the page return from the buddy allocator.  So the page is zeroed twice. 
Fix it by passing __GFP_ZERO instead to avoid double page zeroing.  At the
moment, s390,arm64,x86,alpha,m68k are not impacted since they define their
own vma_alloc_zeroed_movable_folio().

For >0 order folios (mTHP and PMD THP), folio_zero_user() is called to
zero the folio again.  Fix it by calling folio_zero_user() only if
init_on_alloc is set.  All arch are impacted.

Add alloc_zeroed() helper to encapsulate the init_on_alloc check.

[ziy@nvidia.com: comment fixes, per David]
  Link: https://lkml.kernel.org/r/97DB52E1-C594-49B5-9736-89AC302FAB01@nvidia.com
Link: https://lkml.kernel.org/r/20241011150304.709590-1-ziy@nvidia.com
Signed-off-by: Zi Yan <ziy@nvidia.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Acked-by: David Hildenbrand <david@redhat.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: "Huang, Ying" <ying.huang@intel.com>
Cc: John Hubbard <jhubbard@nvidia.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Kefeng Wang <wangkefeng.wang@huawei.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Miaohe Lin <linmiaohe@huawei.com>
Cc: Ryan Roberts <ryan.roberts@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
2024-11-06 20:11:13 -08:00
..
acpi ACPI: CPPC: Make rmw_lock a raw_spin_lock 2024-10-29 12:56:19 +01:00
asm-generic mm: consolidate common checks in hugetlb_get_unmapped_area 2024-11-06 20:11:10 -08:00
clocksource
crypto move asm/unaligned.h to linux/unaligned.h 2024-10-02 17:23:23 -04:00
cxl cxl: Move mailbox related bits to the same context 2024-09-12 08:38:01 -07:00
drm drm/tests: helpers: Add helper for drm_display_mode_from_cea_vic() 2024-10-31 10:31:34 +01:00
dt-bindings soc: convert ep93xx to devicetree 2024-09-26 12:00:25 -07:00
keys KEYS: Remove unused declarations 2024-09-20 18:28:26 +03:00
kunit The core clk framework is left largely untouched this time around except for 2024-09-23 15:01:48 -07:00
kvm
linux mm: avoid zeroing user movable page twice with init_on_alloc=1 2024-11-06 20:11:13 -08:00
math-emu
media media: cec: move cec_get/put_device to header 2024-09-05 20:12:15 +02:00
memory
misc
net ipv4: ip_tunnel: Fix suspicious RCU usage warning in ip_tunnel_init_flow() 2024-10-29 11:12:25 -07:00
pcmcia
ras
rdma move asm/unaligned.h to linux/unaligned.h 2024-10-02 17:23:23 -04:00
rv
scsi move asm/unaligned.h to linux/unaligned.h 2024-10-02 17:23:23 -04:00
soc soc: driver updates for 6.12 2024-09-17 10:48:09 +02:00
sound ALSA: hda: fix trigger_tstamp_latched 2024-10-02 12:50:24 +02:00
target move asm/unaligned.h to linux/unaligned.h 2024-10-02 17:23:23 -04:00
trace memcg: add tracing for memcg stat updates 2024-11-06 20:11:12 -08:00
uapi sound fixes for 6.12-rc5 2024-10-25 10:35:29 -07:00
ufs Many singleton patches - please see the various changelogs for details. 2024-09-21 08:20:50 -07:00
vdso random: vDSO: add a __vdso_getrandom prototype for all architectures 2024-09-13 17:28:35 +02:00
video fbdev: da8xx: remove the driver 2024-10-15 10:08:23 +02:00
xen xen: Remove dependency between pciback and privcmd 2024-10-18 11:59:04 +02:00