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Add valgrind-3.16.1-epoll.patch

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Mark Wielaard 2020-07-28 00:17:06 +02:00
parent 0d4d18b277
commit bf5c38fcec
2 changed files with 91 additions and 0 deletions
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86
valgrind-3.16.1-epoll.patch Normal file
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@ -0,0 +1,86 @@
commit f326d68d762edf4b0e9604daa446b6f8ca25725a
Author: Mark Wielaard <mark@klomp.org>
Date: Sun Jul 26 22:40:22 2020 +0200
epoll_ctl warns for uninitialized padding on non-amd64 64bit arches
struct vki_epoll_event is packed on x86_64, but not on other 64bit
arches. This means that on 64bit arches there can be padding in the
epoll_event struct. Seperately the data field is only used by user
space (which might not set the data field if it doesn't need to).
Only check the events field on epoll_ctl. But assume both events
and data are both written to by epoll_[p]wait (exclude padding).
https://bugs.kde.org/show_bug.cgi?id=422623
diff --git a/coregrind/m_syswrap/syswrap-linux.c b/coregrind/m_syswrap/syswrap-linux.c
index 5b5b7eee6..929a4d9af 100644
--- a/coregrind/m_syswrap/syswrap-linux.c
+++ b/coregrind/m_syswrap/syswrap-linux.c
@@ -2099,8 +2099,29 @@ PRE(sys_epoll_ctl)
SARG1, ( ARG2<3 ? epoll_ctl_s[ARG2] : "?" ), SARG3, ARG4);
PRE_REG_READ4(long, "epoll_ctl",
int, epfd, int, op, int, fd, struct vki_epoll_event *, event);
- if (ARG2 != VKI_EPOLL_CTL_DEL)
- PRE_MEM_READ( "epoll_ctl(event)", ARG4, sizeof(struct vki_epoll_event) );
+ if (ARG2 != VKI_EPOLL_CTL_DEL) {
+ /* Just check the events field, the data field is for user space and
+ unused by the kernel. */
+ struct vki_epoll_event *event = (struct vki_epoll_event *) ARG4;
+ PRE_MEM_READ( "epoll_ctl(event)", (Addr) &event->events,
+ sizeof(__vki_u32) );
+ }
+}
+
+/* RES event records have been written (exclude padding). */
+static void epoll_post_helper ( ThreadId tid, SyscallArgs* arrghs,
+ SyscallStatus* status )
+{
+ vg_assert(SUCCESS);
+ if (RES > 0) {
+ Int i;
+ struct vki_epoll_event **events = (struct vki_epoll_event**)(Addr)ARG2;
+ for (i = 0; i < RES; i++) {
+ /* Assume both events and data are set (data is user space only). */
+ POST_FIELD_WRITE(events[i]->events);
+ POST_FIELD_WRITE(events[i]->data);
+ }
+ }
}
PRE(sys_epoll_wait)
@@ -2111,13 +2132,12 @@ PRE(sys_epoll_wait)
PRE_REG_READ4(long, "epoll_wait",
int, epfd, struct vki_epoll_event *, events,
int, maxevents, int, timeout);
+ /* Assume all (maxevents) events records should be (fully) writable. */
PRE_MEM_WRITE( "epoll_wait(events)", ARG2, sizeof(struct vki_epoll_event)*ARG3);
}
POST(sys_epoll_wait)
{
- vg_assert(SUCCESS);
- if (RES > 0)
- POST_MEM_WRITE( ARG2, sizeof(struct vki_epoll_event)*RES ) ;
+ epoll_post_helper (tid, arrghs, status);
}
PRE(sys_epoll_pwait)
@@ -2130,15 +2150,14 @@ PRE(sys_epoll_pwait)
int, epfd, struct vki_epoll_event *, events,
int, maxevents, int, timeout, vki_sigset_t *, sigmask,
vki_size_t, sigsetsize);
+ /* Assume all (maxevents) events records should be (fully) writable. */
PRE_MEM_WRITE( "epoll_pwait(events)", ARG2, sizeof(struct vki_epoll_event)*ARG3);
if (ARG5)
PRE_MEM_READ( "epoll_pwait(sigmask)", ARG5, sizeof(vki_sigset_t) );
}
POST(sys_epoll_pwait)
{
- vg_assert(SUCCESS);
- if (RES > 0)
- POST_MEM_WRITE( ARG2, sizeof(struct vki_epoll_event)*RES ) ;
+ epoll_post_helper (tid, arrghs, status);
}
PRE(sys_eventfd)

5
valgrind.spec
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@ -96,6 +96,9 @@ Patch6: valgrind-3.16.0-some-Wl-z-now.patch
# KDE#422174 unhandled instruction bytes: 0x48 0xE9 (REX prefix JMP instr)
Patch7: valgrind-3.16.1-REX-prefix-JMP.patch
# KDE#422623 epoll_ctl warns for uninit padding on non-amd64 64bit arches
Patch8: valgrind-3.16.1-epoll.patch
BuildRequires: glibc-devel
%if %{build_openmpi}
@ -228,6 +231,7 @@ Valgrind User Manual for details.
%endif
%patch7 -p1
%patch8 -p1
%build
# LTO triggers undefined symbols in valgrind. Valgrind has a --enable-lto
@ -454,6 +458,7 @@ fi
%changelog
* Mon Jul 27 2020 Mark Wielaard <mjw@fedoraproject.org>
- Add valgrind-3.16.1-REX-prefix-JMP.patch
- Add valgrind-3.16.1-epoll.patch
* Tue Jul 14 2020 Tom Stellard <tstellar@redhat.com> - 3.16.1-3
- Use make macros