DropPrivileges() is used in exception_port_tool, so that when it is
installed as a setuid executable, it only uses elevated privileges to
obtain a task port for its -p option, and then relinquishes those
privileges.
It is difficult to provide a test for this function, because it must be
running setuid or setgid in order to do anything interesting. However,
the function contains its own CHECKs to verify that it behaves properly.
R=rsesek@chromium.org
Review URL: https://codereview.chromium.org/727053002
This also transitions exception_port_tool to use TaskForPID(), so that
it can be safely used as a setuid executable without giving permission
to operate on any process on the system.
It is difficult to provide a test for this function, because it must be
running setuid root in order to do anything interesting.
R=rsesek@chromium.org
Review URL: https://codereview.chromium.org/728973002
This change was generated mechanically by running:
find . \( -name \*.cc -or -name \*.mm -or -name \*.h \) \
-and -not -path ./third_party/\* -and -not -path ./out/\* \
-exec sed -i '' -E -e 's/(^|[^_])NULL/\1nullptr/g' {} +
Further manual fix-ups were applied to remove casts of nullptr to other
pointer types where possible, to preserve the intentional use of NULL
(as a short form of MACH_PORT_NULL) in exception_port_tool, and to fix
80-column violations.
https://groups.google.com/a/chromium.org/d/topic/chromium-dev/4mijeJHzxLg/discussion
TEST=*_test
R=rsesek@chromium.org
Review URL: https://codereview.chromium.org/656703002
This uses THREAD_NULL, TASK_NULL, and HOST_NULL in preference to
MACH_PORT_NULL and kMachPortNull. These constants are correctly-typed
(thread_t, task_t, and host_t) and result in more readable source code,
especially where thread and task parameters appear together as they do
in exc_*_variants.
TEST=util_test
R=rsesek@chromium.org
Review URL: https://codereview.chromium.org/649713002
exception handler ports.
task_t, thread_t, and exception_handler_t are typedefs for mach_port_t.
They are more descriptive than mach_port_t, and are already in use in
exc_server_variants.
TEST=util_test
R=rsesek@chromium.org
Review URL: https://codereview.chromium.org/577293002
mach_exception_data_type_t is more generic and is used for any element
of a codes[] array. For individual elements, the typedefs
mach_exception_code_t and mach_exception_subcode_t are available. Using
mach_exception_code_t when possible gives slightly more descriptive
code.
No functional change.
TEST=util_test ExcServerVariants.*
R=rsesek@chromium.org
Review URL: https://codereview.chromium.org/585473003
catch_exception_tool catches Mach exceptions. Currenlty, it simply
prints a message with some information about each exception it handles.
In the future, it will be tied to the minidump generator as well.
R=rsesek@chromium.org
Review URL: https://codereview.chromium.org/579443005
