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From 16e9cfa909a183d8e61142d80575189408a2a244 Mon Sep 17 00:00:00 2001
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From: Serhei Makarov <smakarov@redhat.com>
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Date: Wed, 24 Oct 2018 15:56:44 -0400
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Subject: [PATCH 01/32] testsuite/systemtap.bpf :: diagnose a bug in
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print_format("%s%s", ...)
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---
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testsuite/systemtap.bpf/asm_tests/string-basic.stp | 19 ++++++++++
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testsuite/systemtap.bpf/bpf_tests/string3.stp | 44 ++++++++++++++++++++++
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2 files changed, 63 insertions(+)
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create mode 100644 testsuite/systemtap.bpf/asm_tests/string-basic.stp
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create mode 100644 testsuite/systemtap.bpf/bpf_tests/string3.stp
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diff --git a/testsuite/systemtap.bpf/asm_tests/string-basic.stp b/testsuite/systemtap.bpf/asm_tests/string-basic.stp
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new file mode 100644
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index 000000000..7377e4399
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--- /dev/null
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+++ b/testsuite/systemtap.bpf/asm_tests/string-basic.stp
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@@ -0,0 +1,19 @@
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+/* narrowing down a bug that turned out unrelated to assembly */
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+function foo:string() %{ /* bpf */ /* pure */
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+ 0xbf, $$, "test", -, -;
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+%}
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+
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+probe begin {
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+ printf("U %s %s\n", foo(), "test"/*bar (5)*/)
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+}
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+
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+probe kernel.function("vfs_read") {
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+ printf("K 1 %s\n", foo()) // <- this worked
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+ printf("K 2 %s\n", "test") // <- this worked
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+ printf("K 3 %s %s\n", foo(), "test") // <- this didn't
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+ printf("K 4 %s %s\n", "test", "test") // <- this didn't
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+ printf("K 5 %s %s\n", foo(), foo()) // <- this didn't
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+ printf("K 6 %s", "test") printf(" %s\n", "test") // <- this did
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+ printf("K %d %s\n", 7, "test") // <- this did
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+ exit()
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+}
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diff --git a/testsuite/systemtap.bpf/bpf_tests/string3.stp b/testsuite/systemtap.bpf/bpf_tests/string3.stp
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new file mode 100644
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index 000000000..cf6ec071d
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--- /dev/null
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+++ b/testsuite/systemtap.bpf/bpf_tests/string3.stp
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@@ -0,0 +1,44 @@
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+// stapbpf string manipulation -- store string in global from kernel space
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+// XXX: the 'locking' scheme here is kind of dumb but it seems to work
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+
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+global counter = 0
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+global var
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+global tab1
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+global tab2
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+
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+@define test_print
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+%(
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+ /* Test multiple %s in one printf */
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+ printf("[")
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+ printf("%s%s%s", "str0", var, tab1[17])
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+ printf("%s]", tab2["key"])
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+%)
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+
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+probe begin {
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+ printf("BEGIN")
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+}
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+
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+probe kernel.function("vfs_read") {
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+ if (counter == 0) {
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+ var = "str1"
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+ tab1[17] = "str2"
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+ tab2["key"] = "str3"
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+ printf("probe0")
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+ @test_print
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+ counter = 1
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+ }
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+}
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+
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+probe kernel.function("vfs_read") {
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+ if (counter == 1) {
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+ printf("probe1")
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+ @test_print
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+ exit()
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+ }
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+}
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+
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+probe end {
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+ printf("end")
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+ @test_print
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+ printf("END\n")
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+}
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--
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2.14.5
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