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-rw-r--r--pkg/abi/linux/epoll.go7
-rw-r--r--pkg/sentry/strace/BUILD1
-rw-r--r--pkg/sentry/strace/epoll.go89
-rw-r--r--pkg/sentry/strace/linux64_amd64.go6
-rw-r--r--pkg/sentry/strace/linux64_arm64.go4
-rw-r--r--pkg/sentry/strace/strace.go8
-rw-r--r--pkg/sentry/strace/syscalls.go10
7 files changed, 120 insertions, 5 deletions
diff --git a/pkg/abi/linux/epoll.go b/pkg/abi/linux/epoll.go
index 6e4de69da..1121a1a92 100644
--- a/pkg/abi/linux/epoll.go
+++ b/pkg/abi/linux/epoll.go
@@ -14,6 +14,10 @@
package linux
+import (
+ "gvisor.dev/gvisor/pkg/binary"
+)
+
// Event masks.
const (
EPOLLIN = 0x1
@@ -53,3 +57,6 @@ const (
EPOLL_CTL_DEL = 0x2
EPOLL_CTL_MOD = 0x3
)
+
+// SizeOfEpollEvent is the size of EpollEvent struct.
+var SizeOfEpollEvent = int(binary.Size(EpollEvent{}))
diff --git a/pkg/sentry/strace/BUILD b/pkg/sentry/strace/BUILD
index 2f39a6f2b..88d5db9fc 100644
--- a/pkg/sentry/strace/BUILD
+++ b/pkg/sentry/strace/BUILD
@@ -7,6 +7,7 @@ go_library(
srcs = [
"capability.go",
"clone.go",
+ "epoll.go",
"futex.go",
"linux64_amd64.go",
"linux64_arm64.go",
diff --git a/pkg/sentry/strace/epoll.go b/pkg/sentry/strace/epoll.go
new file mode 100644
index 000000000..a6e48b836
--- /dev/null
+++ b/pkg/sentry/strace/epoll.go
@@ -0,0 +1,89 @@
+// Copyright 2020 The gVisor Authors.
+//
+// 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 strace
+
+import (
+ "fmt"
+ "strings"
+
+ "gvisor.dev/gvisor/pkg/abi"
+ "gvisor.dev/gvisor/pkg/abi/linux"
+ "gvisor.dev/gvisor/pkg/sentry/kernel"
+ "gvisor.dev/gvisor/pkg/usermem"
+)
+
+func epollEvent(t *kernel.Task, eventAddr usermem.Addr) string {
+ var e linux.EpollEvent
+ if _, err := t.CopyIn(eventAddr, &e); err != nil {
+ return fmt.Sprintf("%#x {error reading event: %v}", eventAddr, err)
+ }
+ var sb strings.Builder
+ fmt.Fprintf(&sb, "%#x ", eventAddr)
+ writeEpollEvent(&sb, e)
+ return sb.String()
+}
+
+func epollEvents(t *kernel.Task, eventsAddr usermem.Addr, numEvents, maxBytes uint64) string {
+ var sb strings.Builder
+ fmt.Fprintf(&sb, "%#x {", eventsAddr)
+ addr := eventsAddr
+ for i := uint64(0); i < numEvents; i++ {
+ var e linux.EpollEvent
+ if _, err := t.CopyIn(addr, &e); err != nil {
+ fmt.Fprintf(&sb, "{error reading event at %#x: %v}", addr, err)
+ continue
+ }
+ writeEpollEvent(&sb, e)
+ if uint64(sb.Len()) >= maxBytes {
+ sb.WriteString("...")
+ break
+ }
+ if _, ok := addr.AddLength(uint64(linux.SizeOfEpollEvent)); !ok {
+ fmt.Fprintf(&sb, "{error reading event at %#x: EFAULT}", addr)
+ continue
+ }
+ }
+ sb.WriteString("}")
+ return sb.String()
+}
+
+func writeEpollEvent(sb *strings.Builder, e linux.EpollEvent) {
+ events := epollEventEvents.Parse(uint64(e.Events))
+ fmt.Fprintf(sb, "{events=%s data=[%#x, %#x]}", events, e.Data[0], e.Data[1])
+}
+
+var epollCtlOps = abi.ValueSet{
+ linux.EPOLL_CTL_ADD: "EPOLL_CTL_ADD",
+ linux.EPOLL_CTL_DEL: "EPOLL_CTL_DEL",
+ linux.EPOLL_CTL_MOD: "EPOLL_CTL_MOD",
+}
+
+var epollEventEvents = abi.FlagSet{
+ {Flag: linux.EPOLLIN, Name: "EPOLLIN"},
+ {Flag: linux.EPOLLPRI, Name: "EPOLLPRI"},
+ {Flag: linux.EPOLLOUT, Name: "EPOLLOUT"},
+ {Flag: linux.EPOLLERR, Name: "EPOLLERR"},
+ {Flag: linux.EPOLLHUP, Name: "EPULLHUP"},
+ {Flag: linux.EPOLLRDNORM, Name: "EPOLLRDNORM"},
+ {Flag: linux.EPOLLRDBAND, Name: "EPOLLRDBAND"},
+ {Flag: linux.EPOLLWRNORM, Name: "EPOLLWRNORM"},
+ {Flag: linux.EPOLLWRBAND, Name: "EPOLLWRBAND"},
+ {Flag: linux.EPOLLMSG, Name: "EPOLLMSG"},
+ {Flag: linux.EPOLLRDHUP, Name: "EPOLLRDHUP"},
+ {Flag: linux.EPOLLEXCLUSIVE, Name: "EPOLLEXCLUSIVE"},
+ {Flag: linux.EPOLLWAKEUP, Name: "EPOLLWAKEUP"},
+ {Flag: linux.EPOLLONESHOT, Name: "EPOLLONESHOT"},
+ {Flag: linux.EPOLLET, Name: "EPOLLET"},
+}
diff --git a/pkg/sentry/strace/linux64_amd64.go b/pkg/sentry/strace/linux64_amd64.go
index a4de545e9..71b92eaee 100644
--- a/pkg/sentry/strace/linux64_amd64.go
+++ b/pkg/sentry/strace/linux64_amd64.go
@@ -256,8 +256,8 @@ var linuxAMD64 = SyscallMap{
229: makeSyscallInfo("clock_getres", Hex, PostTimespec),
230: makeSyscallInfo("clock_nanosleep", Hex, Hex, Timespec, PostTimespec),
231: makeSyscallInfo("exit_group", Hex),
- 232: makeSyscallInfo("epoll_wait", Hex, Hex, Hex, Hex),
- 233: makeSyscallInfo("epoll_ctl", Hex, Hex, FD, Hex),
+ 232: makeSyscallInfo("epoll_wait", FD, EpollEvents, Hex, Hex),
+ 233: makeSyscallInfo("epoll_ctl", FD, EpollCtlOp, FD, EpollEvent),
234: makeSyscallInfo("tgkill", Hex, Hex, Signal),
235: makeSyscallInfo("utimes", Path, Timeval),
// 236: vserver (not implemented in the Linux kernel)
@@ -305,7 +305,7 @@ var linuxAMD64 = SyscallMap{
278: makeSyscallInfo("vmsplice", FD, Hex, Hex, Hex),
279: makeSyscallInfo("move_pages", Hex, Hex, Hex, Hex, Hex, Hex),
280: makeSyscallInfo("utimensat", FD, Path, UTimeTimespec, Hex),
- 281: makeSyscallInfo("epoll_pwait", Hex, Hex, Hex, Hex, SigSet, Hex),
+ 281: makeSyscallInfo("epoll_pwait", FD, EpollEvents, Hex, Hex, SigSet, Hex),
282: makeSyscallInfo("signalfd", Hex, Hex, Hex),
283: makeSyscallInfo("timerfd_create", Hex, Hex),
284: makeSyscallInfo("eventfd", Hex),
diff --git a/pkg/sentry/strace/linux64_arm64.go b/pkg/sentry/strace/linux64_arm64.go
index 8bc38545f..bd7361a52 100644
--- a/pkg/sentry/strace/linux64_arm64.go
+++ b/pkg/sentry/strace/linux64_arm64.go
@@ -45,8 +45,8 @@ var linuxARM64 = SyscallMap{
18: makeSyscallInfo("lookup_dcookie", Hex, Hex, Hex),
19: makeSyscallInfo("eventfd2", Hex, Hex),
20: makeSyscallInfo("epoll_create1", Hex),
- 21: makeSyscallInfo("epoll_ctl", Hex, Hex, FD, Hex),
- 22: makeSyscallInfo("epoll_pwait", Hex, Hex, Hex, Hex, SigSet, Hex),
+ 21: makeSyscallInfo("epoll_ctl", FD, EpollCtlOp, FD, EpollEvent),
+ 22: makeSyscallInfo("epoll_pwait", FD, EpollEvents, Hex, Hex, SigSet, Hex),
23: makeSyscallInfo("dup", FD),
24: makeSyscallInfo("dup3", FD, FD, Hex),
25: makeSyscallInfo("fcntl", FD, Hex, Hex),
diff --git a/pkg/sentry/strace/strace.go b/pkg/sentry/strace/strace.go
index 46cb2a1cc..77655558e 100644
--- a/pkg/sentry/strace/strace.go
+++ b/pkg/sentry/strace/strace.go
@@ -481,6 +481,12 @@ func (i *SyscallInfo) pre(t *kernel.Task, args arch.SyscallArguments, maximumBlo
output = append(output, capData(t, args[arg-1].Pointer(), args[arg].Pointer()))
case PollFDs:
output = append(output, pollFDs(t, args[arg].Pointer(), uint(args[arg+1].Uint()), false))
+ case EpollCtlOp:
+ output = append(output, epollCtlOps.Parse(uint64(args[arg].Int())))
+ case EpollEvent:
+ output = append(output, epollEvent(t, args[arg].Pointer()))
+ case EpollEvents:
+ output = append(output, epollEvents(t, args[arg].Pointer(), 0 /* numEvents */, uint64(maximumBlobSize)))
case SelectFDSet:
output = append(output, fdSet(t, int(args[0].Int()), args[arg].Pointer()))
case Oct:
@@ -549,6 +555,8 @@ func (i *SyscallInfo) post(t *kernel.Task, args arch.SyscallArguments, rval uint
output[arg] = capData(t, args[arg-1].Pointer(), args[arg].Pointer())
case PollFDs:
output[arg] = pollFDs(t, args[arg].Pointer(), uint(args[arg+1].Uint()), true)
+ case EpollEvents:
+ output[arg] = epollEvents(t, args[arg].Pointer(), uint64(rval), uint64(maximumBlobSize))
case GetSockOptVal:
output[arg] = getSockOptVal(t, args[arg-2].Uint64() /* level */, args[arg-1].Uint64() /* optName */, args[arg].Pointer() /* optVal */, args[arg+1].Pointer() /* optLen */, maximumBlobSize, rval)
case SetSockOptVal:
diff --git a/pkg/sentry/strace/syscalls.go b/pkg/sentry/strace/syscalls.go
index 446d1e0f6..7e69b9279 100644
--- a/pkg/sentry/strace/syscalls.go
+++ b/pkg/sentry/strace/syscalls.go
@@ -228,6 +228,16 @@ const (
// SockOptLevel is the optname argument in getsockopt(2) and
// setsockopt(2).
SockOptName
+
+ // EpollCtlOp is the op argument to epoll_ctl(2).
+ EpollCtlOp
+
+ // EpollEvent is the event argument in epoll_ctl(2).
+ EpollEvent
+
+ // EpollEvents is an array of struct epoll_event. It is the events
+ // argument in epoll_wait(2)/epoll_pwait(2).
+ EpollEvents
)
// defaultFormat is the syscall argument format to use if the actual format is
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-25 21:57:49 +0000