35 lines
1.5 KiB
Diff
35 lines
1.5 KiB
Diff
From d1e4332f1a2361014175646fae4f4549b8c1abbf Mon Sep 17 00:00:00 2001
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From: Matt Jolly <kangie@gentoo.org>
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Date: Thu, 13 Feb 2025 16:56:53 +1000
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Subject: [PATCH] seccomp: Define MAP_DROPPABLE for glibc 2.41
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Bug: https://bugs.gentoo.org/949654
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--- a/sandbox/linux/seccomp-bpf-helpers/syscall_parameters_restrictions.cc
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+++ b/sandbox/linux/seccomp-bpf-helpers/syscall_parameters_restrictions.cc
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@@ -1,3 +1,4 @@
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+
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// Copyright 2013 The Chromium Authors
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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@@ -35,6 +36,10 @@
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#include "sandbox/linux/system_headers/linux_syscalls.h"
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#include "sandbox/linux/system_headers/linux_time.h"
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+#if !defined(MAP_DROPPABLE)
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+#define MAP_DROPPABLE 0x08 // Zero memory under memory pressure.
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+#endif
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+
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#if (BUILDFLAG(IS_LINUX) || BUILDFLAG(IS_CHROMEOS_LACROS)) && \
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!defined(__arm__) && !defined(__aarch64__) && \
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!defined(PTRACE_GET_THREAD_AREA)
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@@ -238,7 +243,7 @@ ResultExpr RestrictMmapFlags() {
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// TODO(davidung), remove MAP_DENYWRITE with updated Tegra libraries.
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const uint64_t kAllowedMask = MAP_SHARED | MAP_PRIVATE | MAP_ANONYMOUS |
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MAP_STACK | MAP_NORESERVE | MAP_FIXED |
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- MAP_DENYWRITE | MAP_LOCKED |
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+ MAP_DENYWRITE | MAP_LOCKED | MAP_DROPPABLE |
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kArchSpecificAllowedMask;
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const Arg<int> flags(3);
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return If((flags & ~kAllowedMask) == 0, Allow()).Else(CrashSIGSYS());
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--
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2.48.0
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