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mac: Update test and comments with feedback from Apple bug

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Apple has responded to their bug 29079442 with a resolution stating that
these are not corpse ports but task ports that have changed after
execve(), as part of the large task port and execve() strategy rewrite
from 10.12.1. The comments being replaced were written before we had
10.12.1 source code. Now that we can see what’s going on, revise the
comments, and re-enable the task port check for the non-execve() test
variants.

https://openradar.appspot.com/29079442
https://googleprojectzero.blogspot.com/2016/10/taskt-considered-harmful.html

Bug: crashpad:137
Test: crashpad_snapshot_test MachOImageAnnotationsReader.CrashDyld
Change-Id: I463637816085f4165b92b85a5b98bfeddcdf4094
Reviewed-on: https://chromium-review.googlesource.com/451120
Reviewed-by: Robert Sesek <rsesek@chromium.org>
Commit-Queue: Mark Mentovai <mark@chromium.org>
This commit is contained in:
Mark Mentovai 2017-03-07 17:12:22 -05:00 committed by Commit Bot
parent 6a5695967f
commit 8e82f6fde0
1 changed files with 8 additions and 8 deletions
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16
snapshot/mac/mach_o_image_annotations_reader_test.cc
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@ -117,14 +117,14 @@ class TestMachOImageAnnotationsReader final
bool* destroy_complex_request) override {
*destroy_complex_request = true;
// In 10.12, dyld fatal errors as tested by test_type_ = kCrashDyld are via
// abort_with_payload(). In 10.12.1, the task port delivered in an exception
// message for this termination type is a corpse, even when the exception is
// EXC_CRASH and not EXC_CORPSE_NOTIFY. The corpse task port (here, |task|)
// is distinct from the process’ original task port (ChildTask()). This is
// filed as https://openradar.appspot.com/29079442.
//
// Instead of comparing task ports, compare PIDs.
if (test_type_ != kCrashDyld) {
// In 10.12.1 and later, the task port will not match ChildTask() in the
// kCrashDyld case, because kCrashDyld uses execl(), which results in a
// new task port being assigned.
EXPECT_EQ(ChildTask(), task);
}
// The process ID should always compare favorably.
pid_t task_pid;
kern_return_t kr = pid_for_task(task, &task_pid);
EXPECT_EQ(KERN_SUCCESS, kr) << MachErrorMessage(kr, "pid_for_task");