https://bugs.kde.org/show_bug.cgi?id=397265
Bug ID: 397265
Summary: [PATCH] Add (partial) support for userfaultfd syscall
and related ioctl
Product: valgrind
Version: unspecified
Platform: Other
OS: Linux
Status: UNCONFIRMED
Severity: normal
Priority: NOR
Component: general
Assignee: jsew...@acm.org
Reporter: even.roua...@spatialys.com
Target Milestone: ---
Created attachment 114371
--> https://bugs.kde.org/attachment.cgi?id=114371&action=edit
Implements userfaultfd syscall and related ioctl
The attached patch adds partial support for userfaultfd syscall and related
ioctl
This is just a start, since unfortunately full support for the userfaultfd
mechanism would require deeper changes in Valgrind internals, which I don't
master.
When trying on the demo program at the end of
http://man7.org/linux/man-pages/man2/userfaultfd.2.html,
Attaching gdb, it looks like Valgrind is stuck on the "char c = addr[l];"
instruction that accesses a unmapped page. Apparently the fault-handling thread
is not waken up
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