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commit f326d68d762edf4b0e9604daa446b6f8ca25725a
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Author: Mark Wielaard <mark@klomp.org>
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Date: Sun Jul 26 22:40:22 2020 +0200
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epoll_ctl warns for uninitialized padding on non-amd64 64bit arches
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struct vki_epoll_event is packed on x86_64, but not on other 64bit
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arches. This means that on 64bit arches there can be padding in the
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epoll_event struct. Seperately the data field is only used by user
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space (which might not set the data field if it doesn't need to).
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Only check the events field on epoll_ctl. But assume both events
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and data are both written to by epoll_[p]wait (exclude padding).
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https://bugs.kde.org/show_bug.cgi?id=422623
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diff --git a/coregrind/m_syswrap/syswrap-linux.c b/coregrind/m_syswrap/syswrap-linux.c
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index 5b5b7eee6..929a4d9af 100644
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--- a/coregrind/m_syswrap/syswrap-linux.c
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+++ b/coregrind/m_syswrap/syswrap-linux.c
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@@ -2099,8 +2099,29 @@ PRE(sys_epoll_ctl)
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SARG1, ( ARG2<3 ? epoll_ctl_s[ARG2] : "?" ), SARG3, ARG4);
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PRE_REG_READ4(long, "epoll_ctl",
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int, epfd, int, op, int, fd, struct vki_epoll_event *, event);
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- if (ARG2 != VKI_EPOLL_CTL_DEL)
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- PRE_MEM_READ( "epoll_ctl(event)", ARG4, sizeof(struct vki_epoll_event) );
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+ if (ARG2 != VKI_EPOLL_CTL_DEL) {
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+ /* Just check the events field, the data field is for user space and
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+ unused by the kernel. */
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+ struct vki_epoll_event *event = (struct vki_epoll_event *) ARG4;
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+ PRE_MEM_READ( "epoll_ctl(event)", (Addr) &event->events,
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+ sizeof(__vki_u32) );
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+ }
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+}
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+
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+/* RES event records have been written (exclude padding). */
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+static void epoll_post_helper ( ThreadId tid, SyscallArgs* arrghs,
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+ SyscallStatus* status )
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+{
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+ vg_assert(SUCCESS);
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+ if (RES > 0) {
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+ Int i;
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+ struct vki_epoll_event **events = (struct vki_epoll_event**)(Addr)ARG2;
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+ for (i = 0; i < RES; i++) {
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+ /* Assume both events and data are set (data is user space only). */
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+ POST_FIELD_WRITE(events[i]->events);
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+ POST_FIELD_WRITE(events[i]->data);
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+ }
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+ }
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}
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PRE(sys_epoll_wait)
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@@ -2111,13 +2132,12 @@ PRE(sys_epoll_wait)
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PRE_REG_READ4(long, "epoll_wait",
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int, epfd, struct vki_epoll_event *, events,
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int, maxevents, int, timeout);
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+ /* Assume all (maxevents) events records should be (fully) writable. */
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PRE_MEM_WRITE( "epoll_wait(events)", ARG2, sizeof(struct vki_epoll_event)*ARG3);
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}
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POST(sys_epoll_wait)
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{
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- vg_assert(SUCCESS);
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- if (RES > 0)
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- POST_MEM_WRITE( ARG2, sizeof(struct vki_epoll_event)*RES ) ;
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+ epoll_post_helper (tid, arrghs, status);
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}
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PRE(sys_epoll_pwait)
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@@ -2130,15 +2150,14 @@ PRE(sys_epoll_pwait)
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int, epfd, struct vki_epoll_event *, events,
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int, maxevents, int, timeout, vki_sigset_t *, sigmask,
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vki_size_t, sigsetsize);
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+ /* Assume all (maxevents) events records should be (fully) writable. */
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PRE_MEM_WRITE( "epoll_pwait(events)", ARG2, sizeof(struct vki_epoll_event)*ARG3);
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if (ARG5)
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PRE_MEM_READ( "epoll_pwait(sigmask)", ARG5, sizeof(vki_sigset_t) );
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}
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POST(sys_epoll_pwait)
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{
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- vg_assert(SUCCESS);
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- if (RES > 0)
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- POST_MEM_WRITE( ARG2, sizeof(struct vki_epoll_event)*RES ) ;
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+ epoll_post_helper (tid, arrghs, status);
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}
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PRE(sys_eventfd)
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commit b74f9f23c8758c77367f18368ea95baa858544cb
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Author: Mark Wielaard <mark@klomp.org>
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Date: Tue Aug 18 23:58:55 2020 +0200
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Fix epoll_ctl setting of array event and data fields.
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Fix for https://bugs.kde.org/show_bug.cgi?id=422623 in commit ecf5ba119
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epoll_ctl warns for uninitialized padding on non-amd64 64bit arches
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contained a bug. A pointer to an array is not a pointer to a pointer to
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an array. Found by a Fedora user:
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https://bugzilla.redhat.com/show_bug.cgi?id=1844778#c10
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diff --git a/coregrind/m_syswrap/syswrap-linux.c b/coregrind/m_syswrap/syswrap-linux.c
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index 0850487e9..3f488795a 100644
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--- a/coregrind/m_syswrap/syswrap-linux.c
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+++ b/coregrind/m_syswrap/syswrap-linux.c
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@@ -2115,11 +2115,11 @@ static void epoll_post_helper ( ThreadId tid, SyscallArgs* arrghs,
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vg_assert(SUCCESS);
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if (RES > 0) {
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Int i;
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- struct vki_epoll_event **events = (struct vki_epoll_event**)(Addr)ARG2;
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+ struct vki_epoll_event *events = (struct vki_epoll_event*)(Addr)ARG2;
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for (i = 0; i < RES; i++) {
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/* Assume both events and data are set (data is user space only). */
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- POST_FIELD_WRITE(events[i]->events);
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- POST_FIELD_WRITE(events[i]->data);
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+ POST_FIELD_WRITE(events[i].events);
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+ POST_FIELD_WRITE(events[i].data);
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}
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}
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}
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