Joerg Roedel
697bd3e4aa
x86, vmlinux.lds: Page-align end of ..page_aligned sections ...
commit de2b41be8fcccb2f5b6c480d35df590476344201 upstream.
On x86-32 the idt_table with 256 entries needs only 2048 bytes. It is
page-aligned, but the end of the .bss..page_aligned section is not
guaranteed to be page-aligned.
As a result, objects from other .bss sections may end up on the same 4k
page as the idt_table, and will accidentially get mapped read-only during
boot, causing unexpected page-faults when the kernel writes to them.
This could be worked around by making the objects in the page aligned
sections page sized, but that's wrong.
Explicit sections which store only page aligned objects have an implicit
guarantee that the object is alone in the page in which it is placed. That
works for all objects except the last one. That's inconsistent.
Enforcing page sized objects for these sections would wreckage memory
sanitizers, because the object becomes artificially larger than it should
be and out of bound access becomes legit.
Align the end of the .bss..page_aligned and .data..page_aligned section on
page-size so all objects places in these sections are guaranteed to have
their own page.
[ tglx: Amended changelog ]
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Kees Cook <keescook@chromium.org>
Cc: stable@vger.kernel.org
Link: https://lkml.kernel.org/r/20200721093448.10417-1-joro@8bytes.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-07-29 10:18:45 +02:00
fls: change parameter to unsigned int
2019-01-04 13:13:46 -08:00
lib/vdso: Make __arch_update_vdso_data() logic understandable
2020-03-05 16:43:49 +01:00
mm: make the __PAGETABLE_PxD_FOLDED defines non-empty
2018-11-02 08:31:52 +01:00
include/asm-generic/5level-fixup.h: fix variable 'p4d' set but not used
2019-08-13 16:06:52 -07:00
locking/atomics: Check atomic headers with sha1sum
2019-02-13 08:07:31 +01:00
locking/atomics: Check atomic headers with sha1sum
2019-02-13 08:07:31 +01:00
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 36
2019-05-24 17:27:11 +02:00
locking/atomic: Use s64 for atomic64
2019-06-03 12:32:56 +02:00
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 36
2019-05-24 17:27:11 +02:00
asm-generic, x86: add bitops instrumentation for KASAN
2019-07-12 11:05:42 -07:00
bug: move WARN_ON() "cut here" into exception handler
2019-09-25 17:51:41 -07:00
asm-generic/nds32: don't redefine cacheflush primitives
2020-01-17 19:48:43 +01:00
asm-generic: Move common compat types to asm-generic/compat.h
2018-08-29 15:42:20 +02:00
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 428
2019-06-05 17:37:16 +02:00
asm-generic changes for v5.4
2019-09-17 14:30:30 -07:00
dma-mapping: bypass indirect calls for dma-direct
2018-12-13 21:06:18 +01:00
error-injection: Consolidate override function definition
2019-08-07 13:52:43 +01:00
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 36
2019-05-24 17:27:11 +02:00
module: Remove leftover '#undef' from export header
2019-09-12 15:29:46 +02:00
mm: introduce common STRUCT_PAGE_MAX_SHIFT define
2018-12-14 15:05:45 -08:00
binfmt_flat: remove the persistent argument from flat_get_addr_from_rp
2019-06-24 09:16:47 +10:00
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500
2019-06-19 17:09:55 +02:00
futex: Cleanup generic SMP variant of arch_futex_atomic_op_inuser()
2019-07-22 11:20:10 +02:00
asm-generic: fix -Wtype-limits compiler warnings
2019-08-03 07:02:01 -07:00
hugetlb: allow to free gigantic pages regardless of the configuration
2019-05-14 09:47:47 -07:00
asm-generic: don't provide __ioremap
2019-08-30 21:46:27 +02:00
iomap: introduce io{read|write}64_{lo_hi|hi_lo}
2019-01-22 13:39:59 +01:00
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
2019-05-30 11:26:32 -07:00
asm-generic: make simd.h a mandatory include/asm header
2019-07-31 21:29:24 +10:00
x86/mpx, mm/core: Fix recursive munmap() corruption
2019-05-09 10:37:17 +02:00
asm-generic/mmiowb: Allow mmiowb_set_pending() when preemptible()
2020-07-29 10:18:40 +02:00
asm-generic/mmiowb: Add generic implementation of mmiowb() tracking
2019-04-08 11:59:39 +01:00
x86/Hyper-V: Report crash data in die() when panic_on_oops is set
2020-04-23 10:36:24 +02:00
asm-generic/page.h: fix typo in #error text requiring a real asm/page.h
2019-02-22 21:53:25 +01:00
percpu: remove PER_CPU_DEF_ATTRIBUTES macro
2018-10-31 08:54:14 -07:00
mm: treewide: clarify pgtable_page_{ctor,dtor}() naming
2019-09-26 10:10:44 -07:00
x86/mm: Validate kernel_physical_mapping_init() PTE population
2018-12-05 09:03:06 +01:00
x86/mm: Validate kernel_physical_mapping_init() PTE population
2018-12-05 09:03:06 +01:00
mm: make the __PAGETABLE_PxD_FOLDED defines non-empty
2018-11-02 08:31:52 +01:00
x86/mm: Validate kernel_physical_mapping_init() PTE population
2018-12-05 09:03:06 +01:00
thp: update split_huge_page_pmd() comment
2019-09-24 15:54:10 -07:00
sched/preempt: Use CONFIG_PREEMPTION where appropriate
2019-07-31 19:03:34 +02:00
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 157
2019-05-30 11:26:37 -07:00
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 157
2019-05-30 11:26:37 -07:00
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 157
2019-05-30 11:26:37 -07:00
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500
2019-06-19 17:09:55 +02:00
locking/lockdep: check for freed initmem in static_obj()
2019-04-29 10:47:10 +02:00
treewide: remove SPDX "WITH Linux-syscall-note" from kernel-space headers
2019-05-14 19:52:48 -07:00
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 36
2019-05-24 17:27:11 +02:00
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 193
2019-05-30 11:29:21 -07:00
mm/mmu_gather: invalidate TLB correctly on batch allocation failure and flush
2020-02-11 04:35:42 -08:00
include/asm-generic/topology.h: guard cpumask_of_node() macro argument
2020-06-03 08:21:27 +02:00
asm-generic: optimize generic uaccess for 8-byte loads and stores
2019-04-23 21:51:41 +02:00
x86, vmlinux.lds: Page-align end of ..page_aligned sections
2020-07-29 10:18:45 +02:00
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 47
2019-05-24 17:27:13 +02:00
697bd3e4aa