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| author | Fabricio Voznika <fvoznika@google.com> | 2021-05-03 13:47:45 -0700 |
|---|---|---|
| committer | gVisor bot <gvisor-bot@google.com> | 2021-05-03 13:50:37 -0700 |
| commit | 1947c873423cabcaf5e67b667542421ade7414ff (patch) | |
| tree | b54dd4f68aa20b95367594b8941fcca4cb766636 /test/syscalls/linux | |
| parent | 7cafac9f42a8355e7192b57fcc8d41e31d836c53 (diff) | |
Fix deadlock in /proc/[pid]/fd/[num]
In order to resolve path names, fsSymlink.Readlink() may need to reenter
kernfs. Change the code so that kernfs.Inode.Readlink() is called without
locks and document the new contract.
PiperOrigin-RevId: 371770222
Diffstat (limited to 'test/syscalls/linux')
| -rw-r--r-- | test/syscalls/linux/proc.cc | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/test/syscalls/linux/proc.cc b/test/syscalls/linux/proc.cc index e95174291..143075e2d 100644 --- a/test/syscalls/linux/proc.cc +++ b/test/syscalls/linux/proc.cc @@ -2698,6 +2698,14 @@ TEST(Proc, Statfs) { EXPECT_EQ(st.f_namelen, NAME_MAX); } +// Tests that /proc/[pid]/fd/[num] can resolve to a path inside /proc. +TEST(Proc, ResolveSymlinkToProc) { + const auto proc = ASSERT_NO_ERRNO_AND_VALUE(Open("/proc/self/cmdline", 0)); + const auto path = JoinPath("/proc/self/fd/", absl::StrCat(proc.get())); + const auto target = ASSERT_NO_ERRNO_AND_VALUE(ReadLink(path)); + EXPECT_EQ(target, JoinPath("/proc/", absl::StrCat(getpid()), "/cmdline")); +} + } // namespace } // namespace testing } // namespace gvisor |