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X-Proofpoint-GUID: aXBMVhmGkmgWbJGCFNDFQ2TVi1IR0QqD From: Eugene Loh The char array prvname[] is set for each provider. It is used in the file that implements the provider. It might also be passed to dt_sdt_populate() via a function argument. However, dt_provider_tp.h also defines the macro GROUP_DATA in terms of prvname. In turn, GROUP_DATA is used not only in dt_prov_dtrace.c but then again in dt_prov_fbt.c to define FBT_GROUP_DATA. In commit 0b7c5a632 ("fbt, rawfbt: consolidate code to avoid duplication"), the fbt and rawfbt providers are combined into a single file. Thus, two uses of prvname collide. The in-file collisions get resolved, but the cascade of macro definitions does not: FBT_GROUP_DATA ends up using "fbt" for both fbt and rawfbt providers. As a result, it is possible for rawfbt probes not to be seen. Notice that GROUP_DATA is always paired with prp->desc->prb. Therefore, simply replace: -#define GROUP_DATA getpid(), prvname +#define PROBE_DATA getpid(), prp->desc->prv, prp->desc->prb This makes the code more compact and relieves the macro definitions from needing prvname. It also makes the FBT_GROUP_DATA macro unnecessary. The format (FMT) macro is similarly renamed and redefined to include the probe info. Add a test to check that a rawfbt probe can be found behind an fbt probe when the probe description has a wildcard provider. Orabug: 38842114 Signed-off-by: Eugene Loh --- libdtrace/dt_prov_dtrace.c | 14 ++++----- libdtrace/dt_prov_fbt.c | 13 ++++---- libdtrace/dt_prov_rawtp.c | 4 +-- libdtrace/dt_prov_sdt.c | 4 +-- libdtrace/dt_provider_tp.h | 12 +++---- .../providers/rawfbt/tst.wildcard-provider.d | 31 +++++++++++++++++++ .../providers/rawfbt/tst.wildcard-provider.r | 6 ++++ 7 files changed, 60 insertions(+), 24 deletions(-) create mode 100644 test/unittest/providers/rawfbt/tst.wildcard-provider.d create mode 100644 test/unittest/providers/rawfbt/tst.wildcard-provider.r diff --git a/libdtrace/dt_prov_dtrace.c b/libdtrace/dt_prov_dtrace.c index 9f1d3e104..1bd405b81 100644 --- a/libdtrace/dt_prov_dtrace.c +++ b/libdtrace/dt_prov_dtrace.c @@ -239,8 +239,8 @@ static int attach(dtrace_hdl_t *dtp, const dt_probe_t *prp, int bpf_fd) /* add a uprobe */ fd = open(UPROBE_EVENTS, O_WRONLY | O_APPEND); if (fd != -1) { - rc = dprintf(fd, "p:" GROUP_FMT "/%s %s\n", - GROUP_DATA, prp->desc->prb, spec); + rc = dprintf(fd, "p:" PROBE_FMT " %s\n", + PROBE_DATA, spec); close(fd); } free(spec); @@ -248,14 +248,14 @@ static int attach(dtrace_hdl_t *dtp, const dt_probe_t *prp, int bpf_fd) return -ENOENT; /* open format file */ - len = snprintf(NULL, 0, "%s" GROUP_FMT "/%s/format", - EVENTSFS, GROUP_DATA, prp->desc->prb) + 1; + len = snprintf(NULL, 0, "%s" PROBE_FMT "/format", + EVENTSFS, PROBE_DATA) + 1; fn = dt_alloc(dtp, len); if (fn == NULL) return -ENOENT; - snprintf(fn, len, "%s" GROUP_FMT "/%s/format", - EVENTSFS, GROUP_DATA, prp->desc->prb); + snprintf(fn, len, "%s" PROBE_FMT "/format", + EVENTSFS, PROBE_DATA); f = fopen(fn, "r"); dt_free(dtp, fn); if (f == NULL) @@ -296,7 +296,7 @@ static void detach(dtrace_hdl_t *dtp, const dt_probe_t *prp) if (fd == -1) return; - dprintf(fd, "-:" GROUP_FMT "/%s\n", GROUP_DATA, prp->desc->prb); + dprintf(fd, "-:" PROBE_FMT "\n", PROBE_DATA); close(fd); } diff --git a/libdtrace/dt_prov_fbt.c b/libdtrace/dt_prov_fbt.c index 76134ce1d..ed1bd93d9 100644 --- a/libdtrace/dt_prov_fbt.c +++ b/libdtrace/dt_prov_fbt.c @@ -53,8 +53,7 @@ static const char prvname[] = "fbt"; #define KPROBE_EVENTS TRACEFS "kprobe_events" -#define FBT_GROUP_FMT GROUP_FMT "_%s" -#define FBT_GROUP_DATA GROUP_DATA, prp->desc->prb +#define FBT_PROBE_FMT "dt_%d_%s_%s" static const dtrace_pattr_t pattr = { { DTRACE_STABILITY_EVOLVING, DTRACE_STABILITY_EVOLVING, DTRACE_CLASS_COMMON }, @@ -508,16 +507,16 @@ static int kprobe_attach(dtrace_hdl_t *dtp, const dt_probe_t *prp, int bpf_fd) if (fd == -1) goto out; - rc = dprintf(fd, "%c:" FBT_GROUP_FMT "/%s %s\n", + rc = dprintf(fd, "%c:" FBT_PROBE_FMT "/%s %s\n", prp->desc->prb[0] == 'e' ? 'p' : 'r', - FBT_GROUP_DATA, tpn, fun); + PROBE_DATA, tpn, fun); close(fd); if (rc == -1) goto out; /* create format file name */ - if (asprintf(&fn, "%s" FBT_GROUP_FMT "/%s/format", EVENTSFS, - FBT_GROUP_DATA, tpn) == -1) + if (asprintf(&fn, "%s" FBT_PROBE_FMT "/%s/format", EVENTSFS, + PROBE_DATA, tpn) == -1) goto out; /* open format file */ @@ -583,7 +582,7 @@ static void kprobe_detach(dtrace_hdl_t *dtp, const dt_probe_t *prp) } } - dprintf(fd, "-:" FBT_GROUP_FMT "/%s\n", FBT_GROUP_DATA, tpn); + dprintf(fd, "-:" FBT_PROBE_FMT "/%s\n", PROBE_DATA, tpn); close(fd); if (tpn != prp->desc->fun) diff --git a/libdtrace/dt_prov_rawtp.c b/libdtrace/dt_prov_rawtp.c index 897415459..193795974 100644 --- a/libdtrace/dt_prov_rawtp.c +++ b/libdtrace/dt_prov_rawtp.c @@ -56,7 +56,7 @@ static const dtrace_pattr_t pattr = { /* * The PROBE_LIST file lists all tracepoints in a : format. * We need to ignore these groups: - * - GROUP_FMT (created by DTrace processes) + * - PROBE_SFMT * - kprobes and uprobes * - syscalls (handled by a different provider) * - pid and usdt probes (ditto) @@ -89,7 +89,7 @@ static int populate(dtrace_hdl_t *dtp) *p++ = '\0'; - if (sscanf(buf, GROUP_SFMT, &dummy, &str) == 2) { + if (sscanf(buf, PROBE_SFMT, &dummy, &str) == 2) { free(str); continue; } diff --git a/libdtrace/dt_prov_sdt.c b/libdtrace/dt_prov_sdt.c index fb024b078..f9de2cf85 100644 --- a/libdtrace/dt_prov_sdt.c +++ b/libdtrace/dt_prov_sdt.c @@ -54,7 +54,7 @@ static const dtrace_pattr_t pattr = { /* * The PROBE_LIST file lists all tracepoints in a : format. * We need to ignore these groups: - * - GROUP_FMT (created by DTrace processes) + * - PROBE_SFMT * - kprobes and uprobes * - syscalls (handled by a different provider) * - pid and usdt probes (ditto) @@ -87,7 +87,7 @@ static int populate(dtrace_hdl_t *dtp) *p++ = '\0'; - if (sscanf(buf, GROUP_SFMT, &dummy, &str) == 2) { + if (sscanf(buf, PROBE_SFMT, &dummy, &str) == 2) { free(str); continue; } diff --git a/libdtrace/dt_provider_tp.h b/libdtrace/dt_provider_tp.h index f131b1e02..406609d1b 100644 --- a/libdtrace/dt_provider_tp.h +++ b/libdtrace/dt_provider_tp.h @@ -18,13 +18,13 @@ extern "C" { * Tracepoint group naming format for DTrace providers. Providers may append * to this format string as needed. * - * GROUP_DATA provides the necessary data items to populate the format string - * (PID of the dtrace process and the provider name). GROUP_SFMT is like - * GROUP_FMT, but for sscanf(). + * PROBE_DATA provides the necessary data items to populate the format string. + * PROBE_FMT formats that data. + * PROBE_SFMT is a format string for recognizing PROBE_FMT data in sscanf(). */ -#define GROUP_FMT "dt_%d_%s" -#define GROUP_SFMT "dt_%d_%ms" -#define GROUP_DATA getpid(), prvname +#define PROBE_DATA getpid(), prp->desc->prv, prp->desc->prb +#define PROBE_FMT "dt_%d_%s/%s" +#define PROBE_SFMT "dt_%d_%ms" typedef struct tp_probe tp_probe_t; diff --git a/test/unittest/providers/rawfbt/tst.wildcard-provider.d b/test/unittest/providers/rawfbt/tst.wildcard-provider.d new file mode 100644 index 000000000..f73b33f24 --- /dev/null +++ b/test/unittest/providers/rawfbt/tst.wildcard-provider.d @@ -0,0 +1,31 @@ +/* + * Oracle Linux DTrace. + * Copyright (c) 2026, Oracle and/or its affiliates. All rights reserved. + * Licensed under the Universal Permissive License v 1.0 as shown at + * http://oss.oracle.com/licenses/upl. + */ + +/* + * ASSERTION: rawfbt probes can be found even when a wildcard provider + * description also allows fbt probes. + */ + +/* + * We expect to find 5 probes: + * BEGIN + * fbt vmlinux do_sys_openat2 entry + * fbt vmlinux do_sys_open entry + * rawfbt vmlinux do_sys_openat2 entry + * rawfbt vmlinux do_sys_open entry + * + * We want to validate: + * - the FBT and rawfbt probes are all found + * - the script executes (dtrace could attach to the probes) + */ + +BEGIN, +*fbt:vmlinux:do_sys_open*:entry +{ + printf("success\n"); + exit(0); +} diff --git a/test/unittest/providers/rawfbt/tst.wildcard-provider.r b/test/unittest/providers/rawfbt/tst.wildcard-provider.r new file mode 100644 index 000000000..f7b429211 --- /dev/null +++ b/test/unittest/providers/rawfbt/tst.wildcard-provider.r @@ -0,0 +1,6 @@ + FUNCTION:NAME + :BEGIN success + + +-- @@stderr -- +dtrace: script 'test/unittest/providers/rawfbt/tst.wildcard-provider.d' matched 5 probes -- 2.47.3