Implement /proc/[pid]/smaps.

PiperOrigin-RevId: 228245523
Change-Id: I5a4d0a6570b93958e51437e917e5331d83e23a7e

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()
-}