diff options
Diffstat (limited to 'pkg/sentry/mm/proc_pid_maps.go')
-rw-r--r-- | pkg/sentry/mm/proc_pid_maps.go | 121 |
1 files changed, 0 insertions, 121 deletions
diff --git a/pkg/sentry/mm/proc_pid_maps.go b/pkg/sentry/mm/proc_pid_maps.go deleted file mode 100644 index 247ee45ef..000000000 --- a/pkg/sentry/mm/proc_pid_maps.go +++ /dev/null @@ -1,121 +0,0 @@ -// Copyright 2018 Google LLC -// -// Licensed under the Apache License, Version 2.0 (the "License"); -// you may not use this file except in compliance with the License. -// You may obtain a copy of the License at -// -// http://www.apache.org/licenses/LICENSE-2.0 -// -// Unless required by applicable law or agreed to in writing, software -// distributed under the License is distributed on an "AS IS" BASIS, -// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. -// See the License for the specific language governing permissions and -// limitations under the License. - -package mm - -import ( - "bytes" - "fmt" - "strings" - - "gvisor.googlesource.com/gvisor/pkg/sentry/context" - "gvisor.googlesource.com/gvisor/pkg/sentry/fs/proc/seqfile" - "gvisor.googlesource.com/gvisor/pkg/sentry/usermem" -) - -const ( - // devMinorBits is the number of minor bits in a device number. Linux: - // include/linux/kdev_t.h:MINORBITS - devMinorBits = 20 -) - -// NeedsUpdate implements seqfile.SeqSource.NeedsUpdate. -func (mm *MemoryManager) NeedsUpdate(generation int64) bool { - return true -} - -// ReadSeqFileData is called by fs/proc.mapsData.ReadSeqFileData. -func (mm *MemoryManager) ReadSeqFileData(ctx context.Context, handle seqfile.SeqHandle) ([]seqfile.SeqData, int64) { - mm.mappingMu.RLock() - defer mm.mappingMu.RUnlock() - var data []seqfile.SeqData - var start usermem.Addr - if handle != nil { - start = *handle.(*usermem.Addr) - } - for vseg := mm.vmas.LowerBoundSegment(start); vseg.Ok(); vseg = vseg.NextSegment() { - // FIXME: If we use a usermem.Addr for the handle, we get - // "panic: autosave error: type usermem.Addr is not registered". - vmaAddr := vseg.End() - data = append(data, seqfile.SeqData{ - Buf: mm.vmaMapsEntryLocked(ctx, vseg), - Handle: &vmaAddr, - }) - } - - // We always emulate vsyscall, so advertise it here. Everything about a - // vsyscall region is static, so just hard code the maps entry since we - // don't have a real vma backing it. The vsyscall region is at the end of - // the virtual address space so nothing should be mapped after it (if - // something is really mapped in the tiny ~10 MiB segment afterwards, we'll - // get the sorting on the maps file wrong at worst; but that's not possible - // on any current platform). - // - // Artifically adjust the seqfile handle so we only output vsyscall entry once. - if vsyscallEnd := usermem.Addr(0xffffffffff601000); start != vsyscallEnd { - data = append(data, seqfile.SeqData{ - Buf: []byte("ffffffffff600000-ffffffffff601000 r-xp 00000000 00:00 0 [vsyscall]\n"), - Handle: &vsyscallEnd, - }) - } - return data, 1 -} - -// vmaMapsEntryLocked returns a /proc/[pid]/maps entry for the vma iterated by -// vseg, including the trailing newline. -// -// Preconditions: mm.mappingMu must be locked. -func (mm *MemoryManager) vmaMapsEntryLocked(ctx context.Context, vseg vmaIterator) []byte { - vma := vseg.ValuePtr() - private := "p" - if !vma.private { - private = "s" - } - - var dev, ino uint64 - if vma.id != nil { - dev = vma.id.DeviceID() - ino = vma.id.InodeID() - } - devMajor := uint32(dev >> devMinorBits) - devMinor := uint32(dev & ((1 << devMinorBits) - 1)) - - var b bytes.Buffer - // Do not include the guard page: fs/proc/task_mmu.c:show_map_vma() => - // stack_guard_page_start(). - fmt.Fprintf(&b, "%08x-%08x %s%s %08x %02x:%02x %d ", - vseg.Start(), vseg.End(), vma.realPerms, private, vma.off, devMajor, devMinor, ino) - - // Figure out our filename or hint. - var s string - if vma.hint != "" { - s = vma.hint - } else if vma.id != nil { - // FIXME: We are holding mm.mappingMu here, which is - // consistent with Linux's holding mmap_sem in - // fs/proc/task_mmu.c:show_map_vma() => fs/seq_file.c:seq_file_path(). - // However, it's not clear that fs.File.MappedName() is actually - // consistent with this lock order. - s = vma.id.MappedName(ctx) - } - if s != "" { - // Per linux, we pad until the 74th character. - if pad := 73 - b.Len(); pad > 0 { - b.WriteString(strings.Repeat(" ", pad)) - } - b.WriteString(s) - } - b.WriteString("\n") - return b.Bytes() -} |