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commit 79865f0eed7cf0e0ad687ee0a59d59a1d505b514
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Author: mjw <mjw@a5019735-40e9-0310-863c-91ae7b9d1cf9>
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Date: Sat Jun 17 13:49:22 2017 +0000
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epoll_pwait can have a NULL sigmask.
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According to the epoll_pwait(2) man page:
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The sigmask argument may be specified as NULL, in which case
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epoll_pwait() is equivalent to epoll_wait().
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But doing that under valgrind gives:
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==13887== Syscall param epoll_pwait(sigmask) points to unaddressable byte(s)
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==13887== at 0x4F2B940: epoll_pwait (epoll_pwait.c:43)
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==13887== by 0x400ADE: main (syscalls-2007.c:89)
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==13887== Address 0x0 is not stack'd, malloc'd or (recently) free'd
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This is because the sys_epoll_pwait wrapper has:
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if (ARG4)
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PRE_MEM_READ( "epoll_pwait(sigmask)", ARG5, sizeof(vki_sigset_t) );
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Which looks like a typo (ARG4 is timeout and ARG5 is sigmask).
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This shows up with newer glibc which translates an epoll_wait call into
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an epoll_pwait call with NULL sigmask.
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Fix typo and add a testcase.
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https://bugs.kde.org/show_bug.cgi?id=381289
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git-svn-id: svn://svn.valgrind.org/valgrind/trunk@16451 a5019735-40e9-0310-863c-91ae7b9d1cf9
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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 26e02fd..4120c1d 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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@@ -1901,7 +1901,7 @@ PRE(sys_epoll_pwait)
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int, maxevents, int, timeout, vki_sigset_t *, sigmask,
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vki_size_t, sigsetsize);
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PRE_MEM_WRITE( "epoll_pwait(events)", ARG2, sizeof(struct vki_epoll_event)*ARG3);
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- if (ARG4)
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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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diff --git a/memcheck/tests/linux/syscalls-2007.c b/memcheck/tests/linux/syscalls-2007.c
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index b61c6d5..5494623 100644
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--- a/memcheck/tests/linux/syscalls-2007.c
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+++ b/memcheck/tests/linux/syscalls-2007.c
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@@ -79,5 +79,16 @@ int main (void)
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}
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#endif
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+#if defined(HAVE_EPOLL_CREATE) && defined(HAVE_EPOLL_PWAIT)
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+ {
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+ int fd3;
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+ struct epoll_event evs[10];
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+
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+ fd3 = epoll_create (10);
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+ /* epoll_pwait can take a NULL sigmask. */
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+ epoll_pwait (fd3, evs, 10, 1, NULL);
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+ }
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+#endif
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+
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return 0;
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}
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