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selftests: tls: add test for short splice due to full skmsg

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We don't have a test triggering a partial splice caused by a full
skmsg. Add one, based on a program by Jann Horn.

Use MAX_FRAGS=48 to make sure the skmsg will be full for any allowed
value of CONFIG_MAX_SKB_FRAGS (17..45).

Signed-off-by: Sabrina Dubroca <sd@queasysnail.net>
Link: https://patch.msgid.link/1d129a15f526ea3602f3a2b368aa0b6f7e0d35d5.1760432043.git.sd@queasysnail.net
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Sabrina Dubroca
2025-10-14 11:17:02 +02:00
committed by Jakub Kicinski
parent f95fce1e95
commit 3667e9b442
1 changed files with 31 additions and 0 deletions
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31
tools/testing/selftests/net/tls.c
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@@ -946,6 +946,37 @@ TEST_F(tls, peek_and_splice)
EXPECT_EQ(memcmp(mem_send, mem_recv, send_len), 0);
}
#define MAX_FRAGS 48
TEST_F(tls, splice_short)
{
struct iovec sendchar_iov;
char read_buf[0x10000];
char sendbuf[0x100];
char sendchar = 'S';
int pipefds[2];
int i;
sendchar_iov.iov_base = &sendchar;
sendchar_iov.iov_len = 1;
memset(sendbuf, 's', sizeof(sendbuf));
ASSERT_GE(pipe2(pipefds, O_NONBLOCK), 0);
ASSERT_GE(fcntl(pipefds[0], F_SETPIPE_SZ, (MAX_FRAGS + 1) * 0x1000), 0);
for (i = 0; i < MAX_FRAGS; i++)
ASSERT_GE(vmsplice(pipefds[1], &sendchar_iov, 1, 0), 0);
ASSERT_EQ(write(pipefds[1], sendbuf, sizeof(sendbuf)), sizeof(sendbuf));
EXPECT_EQ(splice(pipefds[0], NULL, self->fd, NULL, MAX_FRAGS + 0x1000, 0),
MAX_FRAGS + sizeof(sendbuf));
EXPECT_EQ(recv(self->cfd, read_buf, sizeof(read_buf), 0), MAX_FRAGS + sizeof(sendbuf));
EXPECT_EQ(recv(self->cfd, read_buf, sizeof(read_buf), MSG_DONTWAIT), -1);
EXPECT_EQ(errno, EAGAIN);
}
#undef MAX_FRAGS
TEST_F(tls, recvmsg_single)
{
char const *test_str = "test_recvmsg_single";