[Bug 51265] New: valgrind shows an uninitialized read in is_wow64_thread()
WineHQ Bugzilla
wine-bugs at winehq.org
Sat Jun 12 16:32:07 CDT 2021
https://bugs.winehq.org/show_bug.cgi?id=51265
Bug ID: 51265
Summary: valgrind shows an uninitialized read in
is_wow64_thread()
Product: Wine
Version: 6.9
Hardware: x86-64
OS: Linux
Status: NEW
Keywords: valgrind
Severity: normal
Priority: P2
Component: wineserver
Assignee: wine-bugs at winehq.org
Reporter: z.figura12 at gmail.com
Distribution: ---
==875840== Conditional jump or move depends on uninitialised value(s)
==875840== at 0x1493A6: is_wow64_thread (registry.c:2074)
==875840== by 0x1493A6: req_create_key (???:0)
==875840== by 0x14AAC2: call_req_handler (request.c:312)
==875840== by 0x14B9E7: read_request (request.c:367)
==875840== by 0x15350F: thread_poll_event (thread.c:383)
==875840== by 0x128D45: fd_poll_event (fd.c:525)
==875840== by 0x128D45: main_loop_epoll (???:0)
==875840== by 0x128FAD: main_loop (fd.c:985)
==875840== by 0x11AA61: main (main.c:149)
The problem is that a process that's starting up makes a couple of
create_key/open_key calls before it maps the main image.
This can be trivially fixed by initializing the "machine" field. None of the
keys we open are actually sensitive to architecture (well, one is, but we use
the WOW64_64KEY flag on it). Still, it strikes me as a little fragile. Can we
determine the architecture any earlier?
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