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44f65d9006
linux/mm
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Jeff Xu 44f65d9006 binfmt_elf: mseal address zero 
In load_elf_binary as part of the execve(), when the current
task’s personality has MMAP_PAGE_ZERO set, the kernel allocates
one page at address 0. According to the comment:

/* Why this, you ask???  Well SVr4 maps page 0 as read-only,
    and some applications "depend" upon this behavior.
    Since we do not have the power to recompile these, we
     emulate the SVr4 behavior. Sigh. */

At one point, Linus suggested removing this [1].

Code search in debian didn't see much use of MMAP_PAGE_ZERO [2],
it exists in util and test (rr).

Sealing this is probably safe, the comment doesn't say
the app ever wanting to change the mapping to rwx. Sealing
also ensures that never happens.

If there is a complaint, we can make this configurable.

Link: https://lore.kernel.org/lkml/CAHk-=whVa=nm_GW=NVfPHqcxDbWt4JjjK1YWb0cLjO4ZSGyiDA@mail.gmail.com/ [1]
Link: https://codesearch.debian.net/search?q=MMAP_PAGE_ZERO&literal=1&perpkg=1&page=1 [2]
Signed-off-by: Jeff Xu <jeffxu@chromium.org>
Link: https://lore.kernel.org/r/20240806214931.2198172-2-jeffxu@google.com
Signed-off-by: Kees Cook <kees@kernel.org>
2024-08-14 09:56:48 -07:00
..
damon mm: provide mm_struct and address to huge_ptep_get() 2024-07-12 15:52:15 -07:00
kasan kasan: fix bad call to unpoison_slab_object 2024-06-24 20:52:09 -07:00
kfence mm: remove CONFIG_MEMCG_KMEM 2024-07-10 12:14:54 -07:00
kmsan kmsan: do not pass NULL pointers as 0 2024-07-03 19:30:26 -07:00
backing-dev.c writeback: support retrieving per group debug writeback stats of bdi 2024-05-05 17:53:51 -07:00
balloon_compaction.c mm: remove MIGRATE_SYNC_NO_COPY mode 2024-07-03 19:30:00 -07:00
bootmem_info.c bootmem: use kmemleak_free_part_phys in put_page_bootmem 2023-10-25 16:47:13 -07:00
cma_debug.c
cma_sysfs.c mm/cma: add sysfs file 'release_pages_success' 2024-02-22 10:24:57 -08:00
cma.c mm/cma: drop incorrect alignment check in cma_init_reserved_mem 2024-04-25 20:56:42 -07:00
cma.h mm/cma: add sysfs file 'release_pages_success' 2024-02-22 10:24:57 -08:00
compaction.c sysctl: treewide: constify the ctl_table argument of proc_handlers 2024-07-24 20:59:29 +02:00
debug_page_alloc.c mm: page_alloc: consolidate free page accounting 2024-04-25 20:56:04 -07:00
debug_page_ref.c
debug_vm_pgtable.c mm/debug_vm_pgtable: drop RANDOM_ORVALUE trick 2024-06-15 10:43:08 -07:00
debug.c mm/debug: print only page mapcount (excluding folio entire mapcount) in __dump_folio() 2024-05-05 17:53:31 -07:00
dmapool_test.c mm/dmapool: add MODULE_DESCRIPTION() 2024-07-03 19:29:58 -07:00
dmapool.c mm/mempool/dmapool: remove CONFIG_DEBUG_SLAB ifdefs 2023-12-05 11:17:58 +01:00
early_ioremap.c
execmem.c mm/execmem, arch: convert remaining overrides of module_alloc to execmem 2024-05-14 00:31:43 -07:00
fadvise.c mm: remove unnecessary pagevec includes 2023-06-23 16:59:31 -07:00
fail_page_alloc.c mm, page_alloc: put should_fail_alloc_page() back behing CONFIG_FAIL_PAGE_ALLOC 2024-07-17 21:05:18 -07:00
failslab.c mm, slab: put should_failslab() back behind CONFIG_SHOULD_FAILSLAB 2024-07-17 21:05:18 -07:00
filemap.c - 875fa64577da ("mm/hugetlb_vmemmap: fix race with speculative PFN 2024-07-21 17:15:46 -07:00
folio-compat.c mm: remove page_mapping() 2024-07-03 19:29:59 -07:00
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
gup.c mm: remove CONFIG_ARCH_HAS_HUGEPD 2024-07-12 15:52:19 -07:00
highmem.c mm/highmem: make nr_free_highpages() return "unsigned long" 2024-07-03 19:30:06 -07:00
hmm.c mm: provide mm_struct and address to huge_ptep_get() 2024-07-12 15:52:15 -07:00
huge_memory.c mm/huge_memory: avoid PMD-size page cache if needed 2024-07-26 14:33:09 -07:00
hugetlb_cgroup.c mm/hugetlb_cgroup: switch to the new cftypes 2024-07-03 19:30:10 -07:00
hugetlb_vmemmap.c Merge branch 'mm-hotfixes-stable' into mm-stable to pick up "mm: fix 2024-07-06 11:44:41 -07:00
hugetlb_vmemmap.h mm: hugetlb_vmemmap: fix reference to nonexistent file 2023-10-25 16:47:14 -07:00
hugetlb.c sysctl: treewide: constify the ctl_table argument of proc_handlers 2024-07-24 20:59:29 +02:00
hwpoison-inject.c mm/hwpoison: add MODULE_DESCRIPTION() 2024-07-03 19:29:58 -07:00
init-mm.c mm: Deprecate pasid field 2023-12-12 10:11:32 +01:00
internal.h Merge branch 'mm-hotfixes-stable' into mm-stable to pick up "mm: fix 2024-07-06 11:44:41 -07:00
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
Kconfig - 875fa64577da ("mm/hugetlb_vmemmap: fix race with speculative PFN 2024-07-21 17:15:46 -07:00
Kconfig.debug mm/slub: unify all sl[au]b parameters with "slab_$param" 2024-01-22 10:31:08 +01:00
khugepaged.c - 875fa64577da ("mm/hugetlb_vmemmap: fix race with speculative PFN 2024-07-21 17:15:46 -07:00
kmemleak.c mm/kmemleak: replace strncpy() with strscpy() 2024-07-17 21:05:18 -07:00
ksm.c Random number generator updates for Linux 6.11-rc1. 2024-07-24 10:29:50 -07:00
list_lru.c mm: remove CONFIG_MEMCG_KMEM 2024-07-10 12:14:54 -07:00
maccess.c
madvise.c Random number generator updates for Linux 6.11-rc1. 2024-07-24 10:29:50 -07:00
Makefile mm: memcg: put cgroup v1-specific code under a config option 2024-07-04 18:05:54 -07:00
mapping_dirty_helpers.c mm: fix clean_record_shared_mapping_range kernel-doc 2023-08-24 16:20:30 -07:00
memblock.c memblock: updates for 6.11-rc1 2024-07-18 14:48:11 -07:00
memcontrol-v1.c mm: memcg1: convert charge move flags to unsigned long long 2024-07-17 21:05:19 -07:00
memcontrol-v1.h mm: memcg: gather memcg1-specific fields initialization in memcg1_memcg_init() 2024-07-04 18:05:56 -07:00
memcontrol.c mm/page_counter: move calculating protection values to page_counter 2024-07-12 15:52:20 -07:00
memfd.c mm/gup: introduce memfd_pin_folios() for pinning memfd folios 2024-07-12 15:52:09 -07:00
memory_hotplug.c mm/page_alloc: put __free_pages_core() in __meminit section 2024-07-12 15:52:21 -07:00
memory-failure.c mm/memory-failure: remove obsolete MF_MSG_DIFFERENT_COMPOUND 2024-07-12 15:52:22 -07:00
memory-tiers.c memory tier: consolidate the initialization of memory tiers 2024-07-12 15:52:20 -07:00
memory.c mm: fix old/young bit handling in the faulting path 2024-07-26 14:33:09 -07:00
mempolicy.c Random number generator updates for Linux 6.11-rc1. 2024-07-24 10:29:50 -07:00
mempool.c mm: fix xyz_noprof functions calling profiled functions 2024-06-05 19:19:26 -07:00
memremap.c mm: convert put_devmap_managed_page_refs() to put_devmap_managed_folio_refs() 2024-05-05 17:53:49 -07:00
memtest.c memtest: use {READ,WRITE}_ONCE in memory scanning 2024-03-13 12:12:21 -07:00
migrate_device.c mm: extend rmap flags arguments for folio_add_new_anon_rmap 2024-07-03 19:30:18 -07:00
migrate.c - 875fa64577da ("mm/hugetlb_vmemmap: fix race with speculative PFN 2024-07-21 17:15:46 -07:00
mincore.c mm: provide mm_struct and address to huge_ptep_get() 2024-07-12 15:52:15 -07:00
mlock.c Random number generator updates for Linux 6.11-rc1. 2024-07-24 10:29:50 -07:00
mm_init.c - 875fa64577da ("mm/hugetlb_vmemmap: fix race with speculative PFN 2024-07-21 17:15:46 -07:00
mm_slot.h
mmap_lock.c mm: mmap_lock: replace get_memcg_path_buf() with on-stack buffer 2024-07-03 19:30:26 -07:00
mmap.c Random number generator updates for Linux 6.11-rc1. 2024-07-24 10:29:50 -07:00
mmu_gather.c mm/mmu_gather: improve cond_resched() handling with large folios and expensive page freeing 2024-02-22 15:27:17 -08:00
mmu_notifier.c mmu_notifier: remove the .change_pte() callback 2024-04-11 13:18:36 -04:00
mmzone.c zswap: shrink zswap pool based on memory pressure 2023-12-12 10:57:02 -08:00
mprotect.c mm: introduce pmd|pte_needs_soft_dirty_wp helpers for softdirty write-protect 2024-07-03 19:30:07 -07:00
mremap.c mm: remove page_mkclean() 2024-07-03 19:30:17 -07:00
mseal.c binfmt_elf: mseal address zero 2024-08-14 09:56:48 -07:00
msync.c
nommu.c The usual shower of singleton fixes and minor series all over MM, 2024-05-19 09:21:03 -07:00
oom_kill.c memory: remove the now superfluous sentinel element from ctl_table array 2024-04-25 20:56:32 -07:00
page_alloc.c mm/page_alloc: fix pcp->count race between drain_pages_zone() vs __rmqueue_pcplist() 2024-07-26 14:33:09 -07:00
page_counter.c mm/page_counter: move calculating protection values to page_counter 2024-07-12 15:52:20 -07:00
page_ext.c mm: report per-page metadata information 2024-07-03 19:30:09 -07:00
page_idle.c
page_io.c mm: ignore data-race in __swap_writepage 2024-07-17 21:05:18 -07:00
page_isolation.c mm: page_isolation: prepare for hygienic freelists 2024-04-25 20:56:04 -07:00
page_owner.c mm/page-owner: use gfp_nested_mask() instead of open coded masking 2024-05-19 14:40:44 -07:00
page_poison.c mm/page_poison: replace kmap_atomic() with kmap_local_page() 2023-12-10 16:51:50 -08:00
page_reporting.c mm, treewide: rename MAX_ORDER to MAX_PAGE_ORDER 2024-01-08 15:27:15 -08:00
page_reporting.h
page_table_check.c mm/page_table_check: fix crash on ZONE_DEVICE 2024-06-15 10:43:04 -07:00
page_vma_mapped.c mm: make page_mapped_in_vma conditional on CONFIG_MEMORY_FAILURE 2024-05-05 17:53:45 -07:00
page-writeback.c sysctl: treewide: constify the ctl_table argument of proc_handlers 2024-07-24 20:59:29 +02:00
pagewalk.c mm: remove CONFIG_ARCH_HAS_HUGEPD 2024-07-12 15:52:19 -07:00
percpu-internal.h mm: remove CONFIG_MEMCG_KMEM 2024-07-10 12:14:54 -07:00
percpu-km.c
percpu-stats.c
percpu-vm.c percpu: clean up all mappings when pcpu_map_pages() fails 2024-04-25 20:55:49 -07:00
percpu.c mm: remove CONFIG_MEMCG_KMEM 2024-07-10 12:14:54 -07:00
pgalloc-track.h
pgtable-generic.c mm: fix race between __split_huge_pmd_locked() and GUP-fast 2024-05-07 10:37:00 -07:00
process_vm_access.c mm: fix process_vm_rw page counts 2023-12-10 16:51:39 -08:00
ptdump.c mm: ptdump: add check_wx_pages debugfs attribute 2024-02-22 10:24:47 -08:00
readahead.c Merge branch 'mm-hotfixes-stable' into mm-stable to pick up "mm: fix 2024-07-06 11:44:41 -07:00
rmap.c Random number generator updates for Linux 6.11-rc1. 2024-07-24 10:29:50 -07:00
rodata_test.c
secretmem.c mm/secretmem: use a folio in secretmem_fault() 2023-08-21 13:38:02 -07:00
shmem_quota.c tmpfs: fix race on handling dquot rbtree 2024-03-26 11:07:23 -07:00
shmem.c - 875fa64577da ("mm/hugetlb_vmemmap: fix race with speculative PFN 2024-07-21 17:15:46 -07:00
show_mem.c lib: add memory allocations report in show_mem() 2024-04-25 20:55:57 -07:00
shrinker_debug.c mm: shrinker: convert shrinker_rwsem to mutex 2023-10-04 10:32:26 -07:00
shrinker.c mm: shrinker: use kvzalloc_node() from expand_one_shrinker_info() 2024-01-05 09:58:32 -08:00
shuffle.c
shuffle.h mm, treewide: rename MAX_ORDER to MAX_PAGE_ORDER 2024-01-08 15:27:15 -08:00
slab_common.c - 875fa64577da ("mm/hugetlb_vmemmap: fix race with speculative PFN 2024-07-21 17:15:46 -07:00
slab.h - 875fa64577da ("mm/hugetlb_vmemmap: fix race with speculative PFN 2024-07-21 17:15:46 -07:00
slub.c - 875fa64577da ("mm/hugetlb_vmemmap: fix race with speculative PFN 2024-07-21 17:15:46 -07:00
sparse-vmemmap.c mm: report per-page metadata information 2024-07-03 19:30:09 -07:00
sparse.c mm/sparse: nr_pages won't be 0 2024-07-03 19:30:19 -07:00
swap_cgroup.c
swap_slots.c mm: swap: update get_swap_pages() to take folio order 2024-04-25 20:56:37 -07:00
swap_state.c mm: swap_state: use folio_alloc_mpol() in __read_swap_cache_async() 2024-07-12 15:52:22 -07:00
swap.c mm/gup: clear the LRU flag of a page before adding to LRU batch 2024-07-17 21:08:54 -07:00
swap.h mm: swap: remove 'synchronous' argument to swap_read_folio() 2024-07-03 19:30:06 -07:00
swapfile.c mm: use folio_add_new_anon_rmap() if folio_test_anon(folio)==false 2024-07-03 19:30:18 -07:00
truncate.c - 875fa64577da ("mm/hugetlb_vmemmap: fix race with speculative PFN 2024-07-21 17:15:46 -07:00
usercopy.c
userfaultfd.c mm: provide mm_struct and address to huge_ptep_get() 2024-07-12 15:52:15 -07:00
util.c sysctl: treewide: constify the ctl_table argument of proc_handlers 2024-07-24 20:59:29 +02:00
vmalloc.c Merge branch 'mm-hotfixes-stable' into mm-stable to pick up "mm: fix 2024-07-06 11:44:41 -07:00
vmpressure.c eventfd: simplify eventfd_signal() 2023-11-28 14:08:38 +01:00
vmscan.c Random number generator updates for Linux 6.11-rc1. 2024-07-24 10:29:50 -07:00
vmstat.c sysctl: treewide: constify the ctl_table argument of proc_handlers 2024-07-24 20:59:29 +02:00
workingset.c cachestat: do not flush stats in recency check 2024-07-03 22:40:37 -07:00
z3fold.c mm: zpool: return pool size in pages 2024-04-25 20:55:48 -07:00
zbud.c mm: zpool: return pool size in pages 2024-04-25 20:55:48 -07:00
zpool.c mm: zpool: return pool size in pages 2024-04-25 20:55:48 -07:00
zsmalloc.c minmax: make generic MIN() and MAX() macros available everywhere 2024-07-28 15:49:18 -07:00
zswap.c mm/zswap: fix a white space issue 2024-07-17 21:08:55 -07:00