[PATCH 3/5] arm64: compat: Allow signal page to be remapped
From: Will Deacon <will@kernel.org>
Date: 2021-03-18 17:09:43
Subsystem:
arm64 port (aarch64 architecture), the rest · Maintainers:
Catalin Marinas, Will Deacon, Linus Torvalds
For compatability with 32-bit Arm, allow the compat signal page to be remapped via mremap(). Signed-off-by: Will Deacon <will@kernel.org> --- arch/arm64/kernel/vdso.c | 9 +++++++++ 1 file changed, 9 insertions(+)
diff --git a/arch/arm64/kernel/vdso.c b/arch/arm64/kernel/vdso.c
index 421411981dc3..16bf0b46fb70 100644
--- a/arch/arm64/kernel/vdso.c
+++ b/arch/arm64/kernel/vdso.c@@ -271,6 +271,14 @@ enum aarch32_map { static struct page *aarch32_vectors_page __ro_after_init; static struct page *aarch32_sig_page __ro_after_init; +static int aarch32_sigpage_mremap(const struct vm_special_mapping *sm, + struct vm_area_struct *new_vma) +{ + current->mm->context.sigpage = (void *)new_vma->vm_start; + + return 0; +} + static struct vm_special_mapping aarch32_vdso_maps[] = { [AA32_MAP_VECTORS] = { .name = "[vectors]", /* ABI */
@@ -279,6 +287,7 @@ static struct vm_special_mapping aarch32_vdso_maps[] = { [AA32_MAP_SIGPAGE] = { .name = "[sigpage]", /* ABI */ .pages = &aarch32_sig_page, + .mremap = aarch32_sigpage_mremap, }, [AA32_MAP_VVAR] = { .name = "[vvar]",
--
2.31.0.rc2.261.g7f71774620-goog
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