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gh-154240: Skip cmsg truncation socket tests on OpenBSD and DragonFly #154244

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Merged
serhiy-storchaka merged 2 commits into from
Jul 20, 2026
Merged

gh-154240: Skip cmsg truncation socket tests on OpenBSD and DragonFly #154244

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f8c8241
gh-154240: Skip cmsg truncation socket tests on OpenBSD and DragonFly
serhiy-storchaka Jul 20, 2026
d75a0f6
Merge remote-tracking branch 'upstream/main' into socket-cmsg-trunc-bsd
serhiy-storchaka Jul 20, 2026
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18 changes: 18 additions & 0 deletions Lib/test/test_socket.py
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Original file line number Diff line number Diff line change
Expand Up @@ -59,6 +59,9 @@
# SCM_RIGHTS control message when several are sent in a single sendmsg().
BSD_COMBINES_SCM_RIGHTS = sys.platform.startswith(
("netbsd", "openbsd", "dragonfly"))
# OpenBSD and DragonFly fail recvmsg() with EMSGSIZE, instead of setting
# MSG_CTRUNC, when the ancillary data buffer is too small for a cmsghdr.
CMSG_TRUNC_RAISES_EMSGSIZE = sys.platform.startswith(("openbsd", "dragonfly"))
WSL = "microsoft-standard-WSL" in platform.release()

try:
Expand Down Expand Up @@ -4351,6 +4354,7 @@ def _testCmsgTrunc0(self):
# (but still too small) buffer sizes.

@skipForRefleakHuntinIf(sys.platform == "darwin", "#80931")
@unittest.skipIf(CMSG_TRUNC_RAISES_EMSGSIZE, "skipping, see gh-154240")
def testCmsgTrunc1(self):
self.checkTruncatedHeader(self.doRecvmsg(self.serv_sock, len(MSG), 1))

Expand All @@ -4359,6 +4363,7 @@ def _testCmsgTrunc1(self):
self.createAndSendFDs(1)

@skipForRefleakHuntinIf(sys.platform == "darwin", "#80931")
@unittest.skipIf(CMSG_TRUNC_RAISES_EMSGSIZE, "skipping, see gh-154240")
def testCmsgTrunc2Int(self):
# The cmsghdr structure has at least three members, two of
# which are ints, so we still shouldn't see any ancillary
Expand All @@ -4371,6 +4376,7 @@ def _testCmsgTrunc2Int(self):
self.createAndSendFDs(1)

@skipForRefleakHuntinIf(sys.platform == "darwin", "#80931")
@unittest.skipIf(CMSG_TRUNC_RAISES_EMSGSIZE, "skipping, see gh-154240")
def testCmsgTruncLen0Minus1(self):
self.checkTruncatedHeader(self.doRecvmsg(self.serv_sock, len(MSG),
socket.CMSG_LEN(0) - 1))
Expand Down Expand Up @@ -4408,6 +4414,7 @@ def checkTruncatedArray(self, ancbuf, maxdata, mindata=0):
self.checkFDs(fds)

@skipForRefleakHuntinIf(sys.platform == "darwin", "#80931")
@unittest.skipIf(CMSG_TRUNC_RAISES_EMSGSIZE, "skipping, see gh-154240")
def testCmsgTruncLen0(self):
self.checkTruncatedArray(ancbuf=socket.CMSG_LEN(0), maxdata=0)

Expand All @@ -4416,6 +4423,7 @@ def _testCmsgTruncLen0(self):
self.createAndSendFDs(1)

@skipForRefleakHuntinIf(sys.platform == "darwin", "#80931")
@unittest.skipIf(CMSG_TRUNC_RAISES_EMSGSIZE, "skipping, see gh-154240")
def testCmsgTruncLen0Plus1(self):
self.checkTruncatedArray(ancbuf=socket.CMSG_LEN(0) + 1, maxdata=1)

Expand All @@ -4424,6 +4432,7 @@ def _testCmsgTruncLen0Plus1(self):
self.createAndSendFDs(2)

@skipForRefleakHuntinIf(sys.platform == "darwin", "#80931")
@unittest.skipIf(CMSG_TRUNC_RAISES_EMSGSIZE, "skipping, see gh-154240")
def testCmsgTruncLen1(self):
self.checkTruncatedArray(ancbuf=socket.CMSG_LEN(SIZEOF_INT),
maxdata=SIZEOF_INT)
Expand All @@ -4434,6 +4443,7 @@ def _testCmsgTruncLen1(self):


@skipForRefleakHuntinIf(sys.platform == "darwin", "#80931")
@unittest.skipIf(CMSG_TRUNC_RAISES_EMSGSIZE, "skipping, see gh-154240")
def testCmsgTruncLen2Minus1(self):
self.checkTruncatedArray(ancbuf=socket.CMSG_LEN(2 * SIZEOF_INT) - 1,
maxdata=(2 * SIZEOF_INT) - 1)
Expand Down Expand Up @@ -4706,6 +4716,7 @@ def _testSingleCmsgTrunc0(self):
# (but still too small) buffer sizes.

@requireAttrs(socket, "IPV6_RECVHOPLIMIT", "IPV6_HOPLIMIT")
@unittest.skipIf(CMSG_TRUNC_RAISES_EMSGSIZE, "skipping, see gh-154240")
def testSingleCmsgTrunc1(self):
self.checkHopLimitTruncatedHeader(ancbufsize=1)

Expand All @@ -4715,6 +4726,7 @@ def _testSingleCmsgTrunc1(self):
self.sendToServer(MSG)

@requireAttrs(socket, "IPV6_RECVHOPLIMIT", "IPV6_HOPLIMIT")
@unittest.skipIf(CMSG_TRUNC_RAISES_EMSGSIZE, "skipping, see gh-154240")
def testSingleCmsgTrunc2Int(self):
self.checkHopLimitTruncatedHeader(ancbufsize=2 * SIZEOF_INT)

Expand All @@ -4724,6 +4736,7 @@ def _testSingleCmsgTrunc2Int(self):
self.sendToServer(MSG)

@requireAttrs(socket, "IPV6_RECVHOPLIMIT", "IPV6_HOPLIMIT")
@unittest.skipIf(CMSG_TRUNC_RAISES_EMSGSIZE, "skipping, see gh-154240")
def testSingleCmsgTruncLen0Minus1(self):
self.checkHopLimitTruncatedHeader(ancbufsize=socket.CMSG_LEN(0) - 1)

Expand All @@ -4733,6 +4746,7 @@ def _testSingleCmsgTruncLen0Minus1(self):
self.sendToServer(MSG)

@requireAttrs(socket, "IPV6_RECVHOPLIMIT", "IPV6_HOPLIMIT")
@unittest.skipIf(CMSG_TRUNC_RAISES_EMSGSIZE, "skipping, see gh-154240")
def testSingleCmsgTruncInData(self):
# Test truncation of a control message inside its associated
# data. The message may be returned with its data truncated,
Expand Down Expand Up @@ -4805,6 +4819,7 @@ def _testSecondCmsgTrunc0(self):

@requireAttrs(socket, "CMSG_SPACE", "IPV6_RECVHOPLIMIT", "IPV6_HOPLIMIT",
"IPV6_RECVTCLASS", "IPV6_TCLASS")
@unittest.skipIf(CMSG_TRUNC_RAISES_EMSGSIZE, "skipping, see gh-154240")
def testSecondCmsgTrunc1(self):
self.checkTruncatedSecondHeader(socket.CMSG_SPACE(SIZEOF_INT) + 1)

Expand All @@ -4815,6 +4830,7 @@ def _testSecondCmsgTrunc1(self):

@requireAttrs(socket, "CMSG_SPACE", "IPV6_RECVHOPLIMIT", "IPV6_HOPLIMIT",
"IPV6_RECVTCLASS", "IPV6_TCLASS")
@unittest.skipIf(CMSG_TRUNC_RAISES_EMSGSIZE, "skipping, see gh-154240")
def testSecondCmsgTrunc2Int(self):
self.checkTruncatedSecondHeader(socket.CMSG_SPACE(SIZEOF_INT) +
2 * SIZEOF_INT)
Expand All @@ -4826,6 +4842,7 @@ def _testSecondCmsgTrunc2Int(self):

@requireAttrs(socket, "CMSG_SPACE", "IPV6_RECVHOPLIMIT", "IPV6_HOPLIMIT",
"IPV6_RECVTCLASS", "IPV6_TCLASS")
@unittest.skipIf(CMSG_TRUNC_RAISES_EMSGSIZE, "skipping, see gh-154240")
def testSecondCmsgTruncLen0Minus1(self):
self.checkTruncatedSecondHeader(socket.CMSG_SPACE(SIZEOF_INT) +
socket.CMSG_LEN(0) - 1)
Expand All @@ -4837,6 +4854,7 @@ def _testSecondCmsgTruncLen0Minus1(self):

@requireAttrs(socket, "CMSG_SPACE", "IPV6_RECVHOPLIMIT", "IPV6_HOPLIMIT",
"IPV6_RECVTCLASS", "IPV6_TCLASS")
@unittest.skipIf(CMSG_TRUNC_RAISES_EMSGSIZE, "skipping, see gh-154240")
def testSecondCmsgTruncInData(self):
# Test truncation of the second of two control messages inside
# its associated data.
Expand Down
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