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Fix Python backtraces for 32-bit inferiors (Tom Tromey, RH BZ 1411094).

This commit is contained in:
Jan Kratochvil 2017-01-08 13:00:47 +01:00
parent b6aa878929
commit a06a12e15b
2 changed files with 140 additions and 1 deletions
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136
gdb-upstream.patch
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@ -458,3 +458,139 @@ index 378eea0..7d9b198 100644
--IS0zKkzwUGydFO0o--
https://bugzilla.redhat.com/show_bug.cgi?id=1411094
http://sourceware.org/ml/gdb-patches/2016-11/msg00076.html
Subject: Re: [RFA 1/2] Fix some error-handling bugs in python frame filters
>>>>> "Tom" == Tom Tromey <tom@tromey.com> writes:
Tom> I've included a test case for the first issue.
I did a -m32 build here and have fixed up the test case.
Here's the new patch. This is ready to review now.
Tom
commit 981628a4af5f82a12351b9764437927d3a8c8169
Author: Tom Tromey <tom@tromey.com>
Date: Mon Oct 31 11:10:35 2016 -0600
Fix some error-handling bugs in python frame filters
While writing a Python frame filter, I found a few bugs in the current
frame filter code. In particular:
* One spot converts a Python long to a CORE_ADDR using PyLong_AsLong.
However, this can fail on overflow. I changed this to use
get_addr_from_python.
* Another spot is doing the same but with PyLong_AsUnsignedLongLong; I
changed this as well just for consistency.
* Converting line numbers can print "-1" if conversion from long
fails. This isn't fatal but just a bit ugly.
I've included a test case for the first issue. The line number one
didn't seem important enough to bother with.
2016-10-31 Tom Tromey <tom@tromey.com>
* python/py-framefilter.c (py_print_frame): Use
get_addr_from_python. Check for errors when getting line number.
2016-10-31 Tom Tromey <tom@tromey.com>
* gdb.python/py-framefilter.py (ElidingFrameDecorator.address):
New method.
diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 1fd85ce..98fcd21 100644
### a/gdb/ChangeLog
### b/gdb/ChangeLog
## -1,3 +1,8 @@
+2016-10-31 Tom Tromey <tom@tromey.com>
+
+ * python/py-framefilter.c (py_print_frame): Use
+ get_addr_from_python. Check for errors when getting line number.
+
2016-11-03 Yao Qi <yao.qi@linaro.org>
* Makefile.in (.y.c): Replace YY_NULL with YY_NULLPTR.
diff --git a/gdb/python/py-framefilter.c b/gdb/python/py-framefilter.c
index 6692ac5..4c7757c 100644
--- a/gdb/python/py-framefilter.c
+++ b/gdb/python/py-framefilter.c
@@ -1116,7 +1116,13 @@ py_print_frame (PyObject *filter, int flags,
if (paddr != Py_None)
{
- address = PyLong_AsLong (paddr);
+ if (get_addr_from_python (paddr, &address) < 0)
+ {
+ Py_DECREF (paddr);
+ do_cleanups (cleanup_stack);
+ return EXT_LANG_BT_ERROR;
+ }
+
has_addr = 1;
}
Py_DECREF (paddr);
@@ -1213,10 +1219,10 @@ py_print_frame (PyObject *filter, int flags,
}
else if (PyLong_Check (py_func))
{
- CORE_ADDR addr = PyLong_AsUnsignedLongLong (py_func);
+ CORE_ADDR addr;
struct bound_minimal_symbol msymbol;
- if (PyErr_Occurred ())
+ if (get_addr_from_python (py_func, &addr) < 0)
{
do_cleanups (cleanup_stack);
return EXT_LANG_BT_ERROR;
@@ -1340,6 +1346,12 @@ py_print_frame (PyObject *filter, int flags,
if (py_line != Py_None)
{
line = PyLong_AsLong (py_line);
+ if (PyErr_Occurred ())
+ {
+ do_cleanups (cleanup_stack);
+ return EXT_LANG_BT_ERROR;
+ }
+
TRY
{
ui_out_text (out, ":");
diff --git a/gdb/testsuite/ChangeLog b/gdb/testsuite/ChangeLog
index 52038e3..d8466f1 100644
### a/gdb/testsuite/ChangeLog
### b/gdb/testsuite/ChangeLog
## -1,3 +1,8 @@
+2016-10-31 Tom Tromey <tom@tromey.com>
+
+ * gdb.python/py-framefilter.py (ElidingFrameDecorator.address):
+ New method.
+
2016-10-28 Pedro Alves <palves@redhat.com>
* gdb.base/maint.exp <maint info line-table w/o a file name>: Use
diff --git a/gdb/testsuite/gdb.python/py-framefilter.py b/gdb/testsuite/gdb.python/py-framefilter.py
index 8fdff84..2580911 100644
--- a/gdb/testsuite/gdb.python/py-framefilter.py
+++ b/gdb/testsuite/gdb.python/py-framefilter.py
@@ -92,6 +92,12 @@ class ElidingFrameDecorator(FrameDecorator):
def elided(self):
return iter(self.elided_frames)
+ def address (self):
+ # Regression test for an overflow in the python layer.
+ bitsize = 8 * gdb.lookup_type('void').pointer().sizeof
+ mask = (1 << bitsize) - 1
+ return 0xffffffffffffffff & mask
+
class ElidingIterator:
def __init__(self, ii):
self.input_iterator = ii

5
gdb.spec
View File

@ -26,7 +26,7 @@ Version: 7.12
# The release always contains a leading reserved number, start it at 1.
# `upstream' is not a part of `name' to stay fully rpm dependencies compatible for the testing.
Release: 34%{?dist}
Release: 35%{?dist}
License: GPLv3+ and GPLv3+ with exceptions and GPLv2+ and GPLv2+ with exceptions and GPL+ and LGPLv2+ and BSD and Public Domain and GFDL
Group: Development/Debuggers
@ -1583,6 +1583,9 @@ then
fi
%changelog
* Sun Jan 8 2017 Jan Kratochvil <jan.kratochvil@redhat.com> - 7.12-35.fc25
- Fix Python backtraces for 32-bit inferiors (Tom Tromey, RH BZ 1411094).
* Fri Jan 6 2017 Jan Kratochvil <jan.kratochvil@redhat.com> - 7.12-34.fc25
- Fix gdb-add-index for 444 *.debug files.