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Danilo Krummrich e3a9fc1520 mm: krealloc: consider spare memory for __GFP_ZERO 
commit 1a83a716ec233990e1fd5b6fbb1200ade63bf450 upstream.

As long as krealloc() is called with __GFP_ZERO consistently, starting
with the initial memory allocation, __GFP_ZERO should be fully honored.

However, if for an existing allocation krealloc() is called with a
decreased size, it is not ensured that the spare portion the allocation is
zeroed.  Thus, if krealloc() is subsequently called with a larger size
again, __GFP_ZERO can't be fully honored, since we don't know the previous
size, but only the bucket size.

Example:

	buf = kzalloc(64, GFP_KERNEL);
	memset(buf, 0xff, 64);

	buf = krealloc(buf, 48, GFP_KERNEL | __GFP_ZERO);

	/* After this call the last 16 bytes are still 0xff. */
	buf = krealloc(buf, 64, GFP_KERNEL | __GFP_ZERO);

Fix this, by explicitly setting spare memory to zero, when shrinking an
allocation with __GFP_ZERO flag set or init_on_alloc enabled.

Link: https://lkml.kernel.org/r/20240812223707.32049-1-dakr@kernel.org
Signed-off-by: Danilo Krummrich <dakr@kernel.org>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Acked-by: David Rientjes <rientjes@google.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Hyeonggon Yoo <42.hyeyoo@gmail.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: Roman Gushchin <roman.gushchin@linux.dev>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 		2024-10-10 11:57:50 +02:00
..
damon mm/damon/vaddr: protect vma traversal in __damon_va_thre_regions() with rcu read lock 2024-10-04 16:30:03 +02:00
kasan kasan/test: avoid gcc warning for intentional overflow 2024-04-03 15:28:20 +02:00
kfence LoongArch changes for v6.6 2023-09-08 12:16:52 -07:00
kmsan kmsan: do not wipe out origin when doing partial unpoisoning 2024-06-16 13:47:41 +02:00
Kconfig mm: restrict the pcp batch scale factor to avoid too long latency 2024-08-11 12:47:16 +02:00
Kconfig.debug mm: page_table_check: Make it dependent on EXCLUSIVE_SYSTEM_RAM 2023-05-29 16:14:28 +01:00
Makefile - Some swap cleanups from Ma Wupeng ("fix WARN_ON in add_to_avail_list") 2023-08-29 14:25:26 -07:00
backing-dev.c blk-wbt: Fix detection of dirty-throttled tasks 2024-02-23 09:25:16 +01:00
balloon_compaction.c
…
bootmem_info.c
…
cma.c mm/cma: drop incorrect alignment check in cma_init_reserved_mem 2024-06-16 13:47:42 +02:00
cma.h
…
cma_debug.c
…
cma_sysfs.c mm: cma: make kobj_type structure constant 2023-03-28 16:20:06 -07:00
compaction.c mm, treewide: introduce NR_PAGE_ORDERS 2024-05-02 16:32:41 +02:00
debug.c mm: update validate_mm() to use vma iterator 2023-06-09 16:25:31 -07:00
debug_page_alloc.c mm: page_alloc: split out DEBUG_PAGEALLOC 2023-06-09 16:25:23 -07:00
debug_page_ref.c
…
debug_vm_pgtable.c mm/debug_vm_pgtable: drop RANDOM_ORVALUE trick 2024-08-19 06:04:31 +02:00
dmapool.c dmapool: create/destroy cleanup 2023-06-09 16:25:17 -07:00
dmapool_test.c dmapool: add alloc/free performance test 2023-04-05 19:42:38 -07:00
early_ioremap.c mm/early_ioremap.c: improve the execution efficiency of early_ioremap_setup() 2023-06-09 16:25:56 -07:00
fadvise.c mm: remove unnecessary pagevec includes 2023-06-23 16:59:31 -07:00
fail_page_alloc.c mm: page_alloc: split out FAIL_PAGE_ALLOC 2023-06-09 16:25:23 -07:00
failslab.c mm: fix unexpected changes to {failslab|fail_page_alloc}.attr 2022-11-22 18:50:44 -08:00
filemap.c mm/filemap: optimize filemap folio adding 2024-10-04 16:30:02 +02:00
folio-compat.c filemap: Add fgf_t typedef 2023-07-24 18:04:30 -04:00
gup.c mm: gup: stop abusing try_grab_folio 2024-08-19 06:04:24 +02:00
gup_test.c Merge mm-hotfixes-stable into mm-stable to pick up depended-upon changes. 2023-06-23 16:58:19 -07:00
gup_test.h mm/gup_test: start/stop/read functionality for PIN LONGTERM test 2022-11-08 17:37:15 -08:00
highmem.c mm: ptep_get() conversion 2023-06-19 16:19:25 -07:00
hmm.c mm: enable page walking API to lock vmas during the walk 2023-08-21 13:07:20 -07:00
huge_memory.c mm/numa: no task_numa_fault() call if PMD is changed 2024-08-29 17:33:58 +02:00
hugetlb.c mm: gup: stop abusing try_grab_folio 2024-08-19 06:04:24 +02:00
hugetlb_cgroup.c mm/hugetlb: increase use of folios in alloc_huge_page() 2023-02-13 15:54:27 -08:00
hugetlb_vmemmap.c mm: hugetlb_vmemmap: fix a race between vmemmap pmd split 2023-08-18 10:12:14 -07:00
hugetlb_vmemmap.h
…
hwpoison-inject.c
…
init-mm.c mm: move dummy_vm_ops out of a header 2023-08-21 13:37:46 -07:00
internal.h mm: gup: stop abusing try_grab_folio 2024-08-19 06:04:24 +02:00
interval_tree.c
…
io-mapping.c
…
ioremap.c mm: ioremap: remove unneeded ioremap_allowed and iounmap_allowed 2023-08-18 10:12:36 -07:00
khugepaged.c - Some swap cleanups from Ma Wupeng ("fix WARN_ON in add_to_avail_list") 2023-08-29 14:25:26 -07:00
kmemleak.c mm/kmemleak: move up cond_resched() call in page scanning loop 2023-09-02 15:17:34 -07:00
ksm.c mm/ksm: fix ksm_zero_pages accounting 2024-06-16 13:47:41 +02:00
list_lru.c
…
maccess.c mm: Fix copy_from_user_nofault(). 2023-04-12 17:36:23 -07:00
madvise.c mm/madvise: make MADV_POPULATE_(READ|WRITE) handle VM_FAULT_RETRY properly 2024-05-02 16:32:40 +02:00
mapping_dirty_helpers.c mm: fix clean_record_shared_mapping_range kernel-doc 2023-08-24 16:20:30 -07:00
memblock.c x86/numa: Fix the address overlap check in numa_fill_memblks() 2024-03-01 13:35:06 +01:00
memcontrol.c memcg_write_event_control(): fix a user-triggerable oops 2024-08-29 17:33:16 +02:00
memfd.c revert "memfd: improve userspace warnings for missing exec-related flags". 2023-09-05 11:11:52 -07:00
memory-failure.c mm/memory-failure: use raw_spinlock_t in struct memory_failure_cpu 2024-08-29 17:33:15 +02:00
memory-tiers.c memory tier: use helper macro __ATTR_RW() 2023-08-18 10:12:38 -07:00
memory.c mm: avoid leaving partial pfn mappings around in error case 2024-09-18 19:24:07 +02:00
memory_hotplug.c x86/kaslr: Expose and use the end of the physical memory address space 2024-09-12 11:11:25 +02:00
mempolicy.c mm/numa_balancing: teach mpol_to_str about the balancing mode 2024-08-03 08:54:25 +02:00
mempool.c mempool: do not use ksize() for poisoning 2022-11-30 15:58:41 -08:00
memremap.c mm/memremap.c: fix outdated comment in devm_memremap_pages 2023-02-09 16:51:46 -08:00
memtest.c memtest: use {READ,WRITE}_ONCE in memory scanning 2024-04-03 15:28:33 +02:00
migrate.c mm/vmscan: fix a bug calling wakeup_kswapd() with a wrong zone index 2024-03-15 10:48:14 -04:00
migrate_device.c Add x86 shadow stack support 2023-08-31 12:20:12 -07:00
mincore.c mm: enable page walking API to lock vmas during the walk 2023-08-21 13:07:20 -07:00
mlock.c merge mm-hotfixes-stable into mm-stable to pick up depended-upon changes 2023-08-21 14:26:20 -07:00
mm_init.c efi: disable mirror feature during crashkernel 2024-01-31 16:18:56 -08:00
mm_slot.h
…
mmap.c mm: call the security_mmap_file() LSM hook in remap_file_pages() 2024-10-04 16:29:43 +02:00
mmap_lock.c mm: mmap_lock: replace get_memcg_path_buf() with on-stack buffer 2024-08-03 08:54:12 +02:00
mmu_gather.c mm: fix kernel-doc warning from tlb_flush_rmaps() 2023-08-24 16:20:30 -07:00
mmu_notifier.c mmu_notifiers: rename invalidate_range notifier 2023-08-18 10:12:41 -07:00
mmzone.c
…
mprotect.c Add x86 shadow stack support 2023-08-31 12:20:12 -07:00
mremap.c vm: fix move_vma() memory accounting being off 2023-09-16 15:23:31 -07:00
msync.c
…
nommu.c Add x86 shadow stack support 2023-08-31 12:20:12 -07:00
oom_kill.c mm: remove redundant K() macro definition 2023-08-21 13:37:44 -07:00
page-writeback.c Revert "mm/writeback: fix possible divide-by-zero in wb_dirty_limits(), again" 2024-07-11 12:49:16 +02:00
page_alloc.c mm: fix endless reclaim on machines with unaccepted memory 2024-08-29 17:33:42 +02:00
page_counter.c
…
page_ext.c mm/page_ext: move functions around for minor cleanups to page_ext 2023-08-18 10:12:31 -07:00
page_idle.c mm: page_idle: convert page idle to use a folio 2023-01-18 17:12:52 -08:00
page_io.c zswap: make zswap_load() take a folio 2023-08-21 13:37:27 -07:00
page_isolation.c mm/hugetlb: get rid of page_hstate() 2023-08-18 10:12:39 -07:00
page_owner.c mm/page_ext: use page_ext_data helper in page_owner 2023-08-21 13:37:27 -07:00
page_poison.c mm/page_poison: remove unused page_ext.h from page_poison 2023-08-21 13:37:30 -07:00
page_reporting.c mm, treewide: introduce NR_PAGE_ORDERS 2024-05-02 16:32:41 +02:00
page_reporting.h
…
page_table_check.c mm/page_table_check: support userfault wr-protect entries 2024-08-19 06:04:29 +02:00
page_vma_mapped.c mm: correct stale comment of function check_pte 2023-08-18 10:12:13 -07:00
pagewalk.c mm/pagewalk: fix bootstopping regression from extra pte_unmap() 2023-09-02 08:39:21 -07:00
percpu-internal.h percpu-internal/pcpu_chunk: re-layout pcpu_chunk structure to reduce false sharing 2023-06-19 16:19:29 -07:00
percpu-km.c
…
percpu-stats.c
…
percpu-vm.c
…
percpu.c mm: Introduce flush_cache_vmap_early() 2024-02-16 19:10:52 +01:00
pgalloc-track.h
…
pgtable-generic.c mm: fix race between __split_huge_pmd_locked() and GUP-fast 2024-06-16 13:47:40 +02:00
process_vm_access.c mm/gup: remove unused vmas parameter from pin_user_pages_remote() 2023-06-09 16:25:25 -07:00
ptdump.c mm: ptdump should use ptep_get_lockless() 2023-06-19 16:19:24 -07:00
readahead.c mm: use memalloc_nofs_save() in page_cache_ra_order() 2024-05-17 12:02:36 +02:00
rmap.c mm: hugetlb: add huge page size param to set_huge_pte_at() 2023-09-29 17:20:47 -07:00
rodata_test.c
…
secretmem.c mm/secretmem: use a folio in secretmem_fault() 2023-08-21 13:38:02 -07:00
shmem.c mm/shmem: disable PMD-sized page cache if needed 2024-07-18 13:21:24 +02:00
shmem_quota.c tmpfs: fix race on handling dquot rbtree 2024-04-03 15:28:54 +02:00
show_mem.c mm, treewide: introduce NR_PAGE_ORDERS 2024-05-02 16:32:41 +02:00
shrinker_debug.c Revert "mm: shrinkers: make count and scan in shrinker debugfs lockless" 2023-06-19 13:19:34 -07:00
shuffle.c
…
shuffle.h mm, treewide: redefine MAX_ORDER sanely 2023-04-05 19:42:46 -07:00
slab.c Randomized slab caches for kmalloc() 2023-07-18 10:07:47 +02:00
slab.h Randomized slab caches for kmalloc() 2023-07-18 10:07:47 +02:00
slab_common.c mm: krealloc: consider spare memory for __GFP_ZERO 2024-10-10 11:57:50 +02:00
slub.c mm/slub: remove freelist_dereference() 2023-07-14 09:57:21 +02:00
sparse-vmemmap.c mm/vmemmap: allow architectures to override how vmemmap optimization works 2023-08-18 10:12:53 -07:00
sparse.c x86/kaslr: Expose and use the end of the physical memory address space 2024-09-12 11:11:25 +02:00
swap.c mm: remove references to pagevec 2023-06-23 16:59:30 -07:00
swap.h mm/swap: fix race when skipping swapcache 2024-03-01 13:35:00 +01:00
swap_cgroup.c
…
swap_slots.c
…
swap_state.c mm/swap: inline folio_set_swap_entry() and folio_swap_entry() 2023-08-24 16:20:28 -07:00
swapfile.c mm: swap: fix race between free_swap_and_cache() and swapoff() 2024-04-03 15:28:27 +02:00
truncate.c mm: Fix missing folio invalidation calls during truncation 2024-09-04 13:28:23 +02:00
usercopy.c mm: Fix copy_from_user_nofault(). 2023-04-12 17:36:23 -07:00
userfaultfd.c userfaultfd: fix checks for huge PMDs 2024-09-12 11:11:27 +02:00
util.c mm: only enforce minimum stack gap size if it's sensible 2024-10-04 16:30:02 +02:00
vmalloc.c mm: vmalloc: ensure vmap_block is initialised before adding to queue 2024-09-12 11:11:27 +02:00
vmpressure.c net-memcg: Fix scope of sockmem pressure indicators 2023-08-16 12:21:32 +01:00
vmscan.c Revert "mm: skip CMA pages when they are not available" 2024-09-12 11:11:42 +02:00
vmstat.c mm, treewide: introduce NR_PAGE_ORDERS 2024-05-02 16:32:41 +02:00
workingset.c mm: ratelimit stat flush from workingset shrinker 2024-06-16 13:47:31 +02:00
z3fold.c mm/z3fold: remove obsolete comment for struct z3fold_pool 2023-08-21 13:37:51 -07:00
zbud.c mm: zswap: remove shrink from zpool interface 2023-06-19 16:19:27 -07:00
zpool.c mm: zswap: remove shrink from zpool interface 2023-06-19 16:19:27 -07:00
zsmalloc.c merge mm-hotfixes-stable into mm-stable to pick up depended-upon changes 2023-08-21 14:26:20 -07:00
zswap.c mm: zswap: fix missing folio cleanup in writeback race path 2024-03-01 13:35:10 +01:00