From: Will Deacon <will@kernel.org>
To: linux-arm-kernel@lists.infradead.org
Cc: kernel-team@android.com, Will Deacon <will@kernel.org>,
Catalin Marinas <catalin.marinas@arm.com>,
Mark Rutland <mark.rutland@arm.com>,
Marc Zyngier <maz@kernel.org>,
Vincenzo Frascino <vincenzo.frascino@arm.com>,
Russell King <rmk+kernel@armlinux.org.uk>
Subject: [PATCH 3/5] arm64: compat: Allow signal page to be remapped
Date: Thu, 18 Mar 2021 17:07:36 +0000 [thread overview]
Message-ID: <20210318170738.7756-4-will@kernel.org> (raw)
In-Reply-To: <20210318170738.7756-1-will@kernel.org>
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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next prev parent reply other threads:[~2021-03-18 17:09 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-18 17:07 [PATCH 0/5] Minor improvements to the compat vdso and sigpage Will Deacon
2021-03-18 17:07 ` [PATCH 1/5] arm64: vdso: Use GFP_KERNEL for allocating compat vdso and signal pages Will Deacon
2021-03-18 18:03 ` Vincenzo Frascino
2021-03-24 17:28 ` Catalin Marinas
2021-03-18 17:07 ` [PATCH 2/5] arm64: vdso: Remove redundant calls to flush_dcache_page() Will Deacon
2021-03-18 18:05 ` Vincenzo Frascino
2021-03-18 17:07 ` Will Deacon [this message]
2021-03-18 18:06 ` [PATCH 3/5] arm64: compat: Allow signal page to be remapped Vincenzo Frascino
2021-03-18 17:07 ` [PATCH 4/5] arm64: vdso: Avoid ISB after reading from cntvct_el0 Will Deacon
2021-03-18 18:08 ` Vincenzo Frascino
2021-03-18 17:07 ` [PATCH 5/5] arm64: compat: Poison the compat sigpage Will Deacon
2021-03-18 18:13 ` Vincenzo Frascino
2021-03-24 16:58 ` [PATCH 0/5] Minor improvements to the compat vdso and sigpage Catalin Marinas
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