diff options
| author | Will Deacon <will@kernel.org> | 2021-03-18 17:07:36 +0000 |
|---|---|---|
| committer | Catalin Marinas <catalin.marinas@arm.com> | 2021-03-24 16:48:41 +0000 |
| commit | 7adbf10e29c2323f5eb6d6bdd13050c70900b993 (patch) | |
| tree | cff28d48652bed935b986c453484cb9249ccd865 /arch/arm64/kernel/vdso.c | |
| parent | e9be47eab1cdaf0a2a3c0af96a6a4be1cf9a95c1 (diff) | |
| download | linux-7adbf10e29c2323f5eb6d6bdd13050c70900b993.tar.bz2 | |
arm64: compat: Allow signal page to be remapped
For compatability with 32-bit Arm, allow the compat signal page to be
remapped via mremap().
Signed-off-by: Will Deacon <will@kernel.org>
Reviewed-by: Vincenzo Frascino <vincenzo.frascino@arm.com>
Link: https://lore.kernel.org/r/20210318170738.7756-4-will@kernel.org
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'arch/arm64/kernel/vdso.c')
| -rw-r--r-- | arch/arm64/kernel/vdso.c | 9 |
1 files changed, 9 insertions, 0 deletions
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]", |