Ard Biesheuvel 3d67976d30 vmlinux.lds: Ensure that const vars with relocations are mapped R/O ... commit 68f3ea7ee1 upstream. In the kernel, there are architectures (x86, arm64) that perform boot-time relocation (for KASLR) without relying on PIE codegen. In this case, all const global objects are emitted into .rodata, including const objects with fields that will be fixed up by the boot-time relocation code. This implies that .rodata (and .text in some cases) need to be writable at boot, but they will usually be mapped read-only as soon as the boot completes. When using PIE codegen, the compiler will emit const global objects into .data.rel.ro rather than .rodata if the object contains fields that need such fixups at boot-time. This permits the linker to annotate such regions as requiring read-write access only at load time, but not at execution time (in user space), while keeping .rodata truly const (in user space, this is important for reducing the CoW footprint of dynamic executables). This distinction does not matter for the kernel, but it does imply that const data will end up in writable memory if the .data.rel.ro sections are not treated in a special way, as they will end up in the writable .data segment by default. So emit .data.rel.ro into the .rodata segment. Cc: stable@vger.kernel.org Signed-off-by: Ard Biesheuvel <ardb@kernel.org> Link: https://lore.kernel.org/r/20250221135704.431269-5-ardb+git@google.com Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2025-03-13 12:51:00 +01:00
..
bitops	locking/atomic: Make test_and_*_bit() ordered on failure	2022-08-25 11:39:54 +02:00
vdso
asm-offsets.h
asm-prototypes.h
atomic.h	locking/atomic: delete !ARCH_ATOMIC remnants	2021-05-26 13:20:52 +02:00
atomic64.h	locking/atomic: delete !ARCH_ATOMIC remnants	2021-05-26 13:20:52 +02:00
audit_change_attr.h
audit_dir_write.h
audit_read.h
audit_signal.h
audit_write.h
barrier.h	compiler.h: fix barrier_data() on clang	2020-11-14 11:26:03 -08:00
bitops.h
bitsperlong.h	lib: extend the scope of small_const_nbits() macro	2021-05-06 19:24:11 -07:00
bug.h	Merge branch 'akpm' (patches from Andrew)	2021-07-02 12:08:10 -07:00
cache.h
cacheflush.h	make asm-generic/cacheflush.h more standalone	2020-06-26 00:27:37 -07:00
checksum.h	unify generic instances of csum_partial_copy_nocheck()	2020-08-20 15:45:14 -04:00
cmpxchg-local.h	locking/atomic: cmpxchg: make generic a prefix	2021-05-26 13:20:50 +02:00
cmpxchg.h	locking/atomic: delete !ARCH_ATOMIC remnants	2021-05-26 13:20:52 +02:00
compat.h	compat: make linux/compat.h available everywhere	2021-07-23 14:20:24 +01:00
current.h
delay.h
device.h
div64.h	ARM: 9117/1: asm-generic: div64: Remove always-true __div64_const32_is_OK()	2021-08-20 11:39:28 +01:00
dma-mapping.h
dma.h
early_ioremap.h	mm/early_ioremap.c: remove redundant early_ioremap_shutdown()	2021-09-08 11:50:24 -07:00
emergency-restart.h
error-injection.h	treewide: Convert macro and uses of __section(foo) to __section("foo")	2020-10-25 14:51:49 -07:00
exec.h
export.h	asm-generic: export: Stub EXPORT_SYMBOL with __DISABLE_EXPORTS	2021-02-03 16:42:57 +00:00
extable.h
fb.h
fixmap.h
flat.h
ftrace.h
futex.h
getorder.h	asm-generic: force inlining of get_order() to work around gcc10 poor decision	2020-12-15 22:46:15 -08:00
gpio.h
hardirq.h	irqstat: Move declaration into asm-generic/hardirq.h	2020-11-23 10:31:06 +01:00
hugetlb.h	mm: Allow arches to provide ptep_get()	2020-06-20 22:14:53 +10:00
hw_irq.h
hyperv-tlfs.h	asm-generic/hyperv: add HV_STATUS_ACCESS_DENIED definition	2021-06-17 13:09:38 -04:00
ide_iops.h
int-ll64.h
io.h	asm-generic/io.h: suppress endianness warnings for readq() and writeq()	2023-05-11 23:00:15 +09:00
ioctl.h
iomap.h	parisc: Declare pci_iounmap() parisc version only when CONFIG_PCI enabled	2021-09-19 10:36:09 -07:00
irq_regs.h
irq_work.h
irq.h
irqflags.h
Kbuild	Rework of the X86 irq stack handling:	2021-02-24 16:32:23 -08:00
kdebug.h
kmap_size.h	mm/highmem: Provide and use CONFIG_DEBUG_KMAP_LOCAL	2020-11-24 14:42:08 +01:00
kprobes.h	treewide: Convert macro and uses of __section(foo) to __section("foo")	2020-10-25 14:51:49 -07:00
kvm_para.h
kvm_types.h	KVM: Move x86's version of struct kvm_mmu_memory_cache to common code	2020-07-09 13:29:42 -04:00
linkage.h
local.h
local64.h
logic_io.h	lib: add iomem emulation (logic_iomem)	2021-06-17 21:44:51 +02:00
mcs_spinlock.h
memory_model.h	mm: remove CONFIG_DISCONTIGMEM	2021-06-29 10:53:55 -07:00
mm_hooks.h
mmiowb_types.h
mmiowb.h	asm-generic/mmiowb: Allow mmiowb_set_pending() when preemptible()	2020-07-17 10:02:03 +01:00
mmu_context.h	asm-generic: add generic MMU versions of mmu context functions	2020-10-26 16:45:03 +01:00
mmu.h
module.h
module.lds.h	kbuild: preprocess module linker script	2020-09-25 00:36:41 +09:00
mshyperv.h	hyperv-fixes for 5.15-rc2	2021-09-15 17:18:56 -07:00
msi.h	Generic interrupt and irqchips subsystem:	2020-12-15 15:03:31 -08:00
nommu_context.h	asm-generic: add generic MMU versions of mmu context functions	2020-10-26 16:45:03 +01:00
numa.h	arm64: irq: set the correct node for VMAP stack	2024-02-23 08:54:36 +01:00
page.h	c6x: remove architecture	2021-01-20 09:30:45 +01:00
param.h
parport.h
pci_iomap.h	parisc: Declare pci_iounmap() parisc version only when CONFIG_PCI enabled	2021-09-19 10:36:09 -07:00
pci.h
percpu.h	asm-generic: percpu: avoid Wshadow warning	2020-10-26 23:54:48 +00:00
pgalloc.h	asm-generic: pgalloc.h: use correct #ifdef to enable pud_alloc_one()	2020-08-14 19:56:55 -07:00
pgtable_uffd.h
pgtable-nop4d.h	mm: rename p4d_page_vaddr to p4d_pgtable and make it return pud_t *	2021-07-08 11:48:22 -07:00
pgtable-nopmd.h	mm: rename pud_page_vaddr to pud_pgtable and make it return pmd_t *	2021-07-08 11:48:22 -07:00
pgtable-nopud.h	mm: rename p4d_page_vaddr to p4d_pgtable and make it return pud_t *	2021-07-08 11:48:22 -07:00
preempt.h	sched/core: Initialize the idle task with preemption disabled	2021-05-12 13:01:45 +02:00
qrwlock_types.h
qrwlock.h	locking/arch: Move qrwlock.h include after qspinlock.h	2021-02-11 07:59:54 -05:00
qspinlock_types.h	locking/qspinlock: Do not include atomic.h from qspinlock_types.h	2020-07-29 16:14:19 +02:00
qspinlock.h	asm-generic: qspinlock: fix queued_spin_value_unlocked() implementation	2023-12-20 15:17:40 +01:00
resource.h
rwonce.h	asm/rwonce: Don't pull <asm/barrier.h> into 'asm-generic/rwonce.h'	2020-07-21 10:50:36 +01:00
seccomp.h	seccomp: Use -1 marker for end of mode 1 syscall list	2020-07-10 16:01:52 -07:00
sections.h	asm-generic: sections: refactor memory_intersects	2022-08-31 17:16:47 +02:00
serial.h
set_memory.h
shmparam.h
signal.h
simd.h
softirq_stack.h	softirq: Move do_softirq_own_stack() to generic asm header	2021-02-10 23:34:16 +01:00
spinlock.h
statfs.h
string.h
switch_to.h
syscall.h	audit: Migrate to use SYSCALL_WORK flag	2020-11-16 21:53:16 +01:00
syscalls.h
termios-base.h
termios.h
timex.h
tlb.h	mm/khugepaged: fix GUP-fast interaction by sending IPI	2022-12-14 11:37:17 +01:00
tlbflush.h
topology.h	mm: replace CONFIG_NEED_MULTIPLE_NODES with CONFIG_NUMA	2021-06-29 10:53:55 -07:00
trace_clock.h
uaccess.h	asm-generic: uaccess: remove inline strncpy_from_user/strnlen_user	2021-07-27 23:01:13 +02:00
unaligned.h	asm-generic: simplify asm/unaligned.h	2021-05-17 13:30:29 +02:00
user.h
vermagic.h
vga.h
vmlinux.lds.h	vmlinux.lds: Ensure that const vars with relocations are mapped R/O	2025-03-13 12:51:00 +01:00
vtime.h
word-at-a-time.h	word-at-a-time: use the same return type for has_zero regardless of endianness	2023-08-11 15:13:49 +02:00
xor.h