mirror of
https://github.com/hanzoai/visor.git
synced 2026-09-24 17:04:14 +00:00
Luis Capelo
38ae3ca5f1
gVisor ignored [`MAP_FIXED_NOREPLACE`](https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=a4ff8e8620d3f4f50ac4b41e8067b7d395056843), treating the address as a hint. Reservations over occupied ranges silently landed elsewhere instead of failing with `EEXIST`. This breaks the NVIDIA driver's `PROT_NONE` placeholders over released `/dev/nvidia*` ranges during `cuda-checkpoint`: the ranges stay vacant in a memory snapshot, get reused on restore, and are then clobbered by the driver's `MAP_FIXED` remap → SIGSEGV. Implement Linux semantics (`mm/mmap.c:do_mmap()`): exact placement or `EEXIST` on any overlap (including partial), never clobbering — even combined with `MAP_FIXED`. Unaligned addr → `EINVAL`. Existing `Fixed && !Unmap` callers keep `ENOMEM`. Also decode the flag in strace.
97 lines
1.8 KiB
Go
97 lines
1.8 KiB
Go
// Copyright 2021 The gVisor Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package strace
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import (
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"gvisor.dev/gvisor/pkg/abi"
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"gvisor.dev/gvisor/pkg/abi/linux"
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)
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// ProtectionFlagSet represents the protection to mmap(2).
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var ProtectionFlagSet = abi.FlagSet{
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{
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Flag: linux.PROT_READ,
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Name: "PROT_READ",
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},
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{
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Flag: linux.PROT_WRITE,
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Name: "PROT_WRITE",
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},
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{
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Flag: linux.PROT_EXEC,
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Name: "PROT_EXEC",
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},
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}
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// MmapFlagSet is the set of mmap(2) flags.
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var MmapFlagSet = abi.FlagSet{
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{
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Flag: linux.MAP_SHARED,
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Name: "MAP_SHARED",
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},
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{
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Flag: linux.MAP_PRIVATE,
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Name: "MAP_PRIVATE",
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},
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{
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Flag: linux.MAP_FIXED,
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Name: "MAP_FIXED",
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},
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{
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Flag: linux.MAP_ANONYMOUS,
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Name: "MAP_ANONYMOUS",
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},
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{
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Flag: linux.MAP_GROWSDOWN,
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Name: "MAP_GROWSDOWN",
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},
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{
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Flag: linux.MAP_DENYWRITE,
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Name: "MAP_DENYWRITE",
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},
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{
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Flag: linux.MAP_EXECUTABLE,
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Name: "MAP_EXECUTABLE",
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},
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{
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Flag: linux.MAP_LOCKED,
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Name: "MAP_LOCKED",
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},
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{
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Flag: linux.MAP_NORESERVE,
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Name: "MAP_NORESERVE",
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},
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{
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Flag: linux.MAP_POPULATE,
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Name: "MAP_POPULATE",
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},
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{
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Flag: linux.MAP_NONBLOCK,
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Name: "MAP_NONBLOCK",
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},
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{
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Flag: linux.MAP_STACK,
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Name: "MAP_STACK",
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},
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{
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Flag: linux.MAP_HUGETLB,
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Name: "MAP_HUGETLB",
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},
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{
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Flag: linux.MAP_FIXED_NOREPLACE,
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Name: "MAP_FIXED_NOREPLACE",
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},
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}
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