From 1adedad81c0ddc68526d616ad31daf2af0135f47 Mon Sep 17 00:00:00 2001 From: Tiwei Bie Date: Thu, 10 Sep 2020 21:47:17 +0800 Subject: Fix proc.(*fdDir).IterDirents for VFS2 Currently the returned offset is an index, and we can't use it to find the next fd to serialize, because getdents should iterate correctly despite mutation of fds. Instead, we can return the next fd to serialize plus 2 (which accounts for "." and "..") as the offset. Fixes: #3894 Signed-off-by: Tiwei Bie --- test/syscalls/linux/proc.cc | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+) (limited to 'test/syscalls/linux') diff --git a/test/syscalls/linux/proc.cc b/test/syscalls/linux/proc.cc index b73189e55..f3f80a12a 100644 --- a/test/syscalls/linux/proc.cc +++ b/test/syscalls/linux/proc.cc @@ -694,6 +694,30 @@ TEST(ProcSelfFd, OpenFd) { ASSERT_THAT(close(pipe_fds[1]), SyscallSucceeds()); } +static void CheckFdDirGetdentsDuplicates(const std::string& path) { + const FileDescriptor fd = + ASSERT_NO_ERRNO_AND_VALUE(Open(path.c_str(), O_RDONLY | O_DIRECTORY)); + // Open a FD whose value is supposed to be much larger than + // the number of FDs opened by current process. + auto newfd = fcntl(fd.get(), F_DUPFD, 1024); + EXPECT_GE(newfd, 1024); + auto fd_closer = Cleanup([newfd]() { close(newfd); }); + auto fd_files = ASSERT_NO_ERRNO_AND_VALUE(ListDir(path.c_str(), false)); + std::unordered_set fd_files_dedup(fd_files.begin(), + fd_files.end()); + EXPECT_EQ(fd_files.size(), fd_files_dedup.size()); +} + +// This is a regression test for gvisor.dev/issues/3894 +TEST(ProcSelfFd, GetdentsDuplicates) { + CheckFdDirGetdentsDuplicates("/proc/self/fd"); +} + +// This is a regression test for gvisor.dev/issues/3894 +TEST(ProcSelfFdInfo, GetdentsDuplicates) { + CheckFdDirGetdentsDuplicates("/proc/self/fdinfo"); +} + TEST(ProcSelfFdInfo, CorrectFds) { // Make sure there is at least one open file. auto f = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateFile()); -- cgit v1.2.3