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-rw-r--r--test/syscalls/linux/proc_pid_uid_gid_map.cc17
1 files changed, 17 insertions, 0 deletions
diff --git a/test/syscalls/linux/proc_pid_uid_gid_map.cc b/test/syscalls/linux/proc_pid_uid_gid_map.cc
index bf0f8b2bb..e6a5265fa 100644
--- a/test/syscalls/linux/proc_pid_uid_gid_map.cc
+++ b/test/syscalls/linux/proc_pid_uid_gid_map.cc
@@ -129,6 +129,23 @@ TEST_P(ProcSelfUidGidMapTest, IdentityMapOwnID) {
IsPosixErrorOkAndHolds(0));
}
+TEST_P(ProcSelfUidGidMapTest, TrailingNewlineAndNULIgnored) {
+ // This is identical to IdentityMapOwnID, except that a trailing newline, NUL,
+ // and an invalid (incomplete) map entry are appended to the valid entry. The
+ // newline should be accepted, and everything after the NUL should be ignored.
+ SKIP_IF(!ASSERT_NO_ERRNO_AND_VALUE(CanCreateUserNamespace()));
+ uint32_t id = CurrentID();
+ std::string line = absl::StrCat(id, " ", id, " 1\n\0 4 3");
+ EXPECT_THAT(
+ InNewUserNamespaceWithMapFD([&](int fd) {
+ DenySelfSetgroups();
+ // The write should return the full size of the write, even though
+ // characters after the NUL were ignored.
+ TEST_PCHECK(write(fd, line.c_str(), line.size()) == line.size());
+ }),
+ IsPosixErrorOkAndHolds(0));
+}
+
TEST_P(ProcSelfUidGidMapTest, NonIdentityMapOwnID) {
SKIP_IF(!ASSERT_NO_ERRNO_AND_VALUE(CanCreateUserNamespace()));
SKIP_IF(ASSERT_NO_ERRNO_AND_VALUE(HaveSetIDCapability()));