diff options
author | Alan Maguire <alan.maguire@oracle.com> | 2022-04-06 14:43:51 +0300 |
---|---|---|
committer | Andrii Nakryiko <andrii@kernel.org> | 2022-04-07 21:42:51 +0300 |
commit | 1717e248014c33a81d7a1cdc048c6b3bed7bb3f8 (patch) | |
tree | 19b8fcc5a57a399ac1b4510a1453a8e8ad29d7cd /tools/testing/selftests/bpf/progs/test_uprobe_autoattach.c | |
parent | 90db26e6be01cea519d380c59db3491e75b96b7f (diff) | |
download | linux-1717e248014c33a81d7a1cdc048c6b3bed7bb3f8.tar.xz |
selftests/bpf: Uprobe tests should verify param/return values
uprobe/uretprobe tests don't do any validation of arguments/return values,
and without this we can't be sure we are attached to the right function,
or that we are indeed attached to a uprobe or uretprobe. To fix this
record argument and return value for auto-attached functions and ensure
these match expectations. Also need to filter by pid to ensure we do
not pick up stray malloc()s since auto-attach traces libc system-wide.
Suggested-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Alan Maguire <alan.maguire@oracle.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/1649245431-29956-4-git-send-email-alan.maguire@oracle.com
Diffstat (limited to 'tools/testing/selftests/bpf/progs/test_uprobe_autoattach.c')
-rw-r--r-- | tools/testing/selftests/bpf/progs/test_uprobe_autoattach.c | 43 |
1 files changed, 32 insertions, 11 deletions
diff --git a/tools/testing/selftests/bpf/progs/test_uprobe_autoattach.c b/tools/testing/selftests/bpf/progs/test_uprobe_autoattach.c index b442fb5ef54b..ab75522e2eeb 100644 --- a/tools/testing/selftests/bpf/progs/test_uprobe_autoattach.c +++ b/tools/testing/selftests/bpf/progs/test_uprobe_autoattach.c @@ -1,15 +1,22 @@ // SPDX-License-Identifier: GPL-2.0 /* Copyright (c) 2022, Oracle and/or its affiliates. */ -#include <linux/ptrace.h> -#include <linux/bpf.h> +#include "vmlinux.h" + +#include <bpf/bpf_core_read.h> #include <bpf/bpf_helpers.h> #include <bpf/bpf_tracing.h> -int uprobe_byname_res = 0; -int uretprobe_byname_res = 0; -int uprobe_byname2_res = 0; -int uretprobe_byname2_res = 0; +int uprobe_byname_parm1 = 0; +int uprobe_byname_ran = 0; +int uretprobe_byname_rc = 0; +int uretprobe_byname_ran = 0; +size_t uprobe_byname2_parm1 = 0; +int uprobe_byname2_ran = 0; +char *uretprobe_byname2_rc = NULL; +int uretprobe_byname2_ran = 0; + +int test_pid; /* This program cannot auto-attach, but that should not stop other * programs from attaching. @@ -23,14 +30,16 @@ int handle_uprobe_noautoattach(struct pt_regs *ctx) SEC("uprobe//proc/self/exe:autoattach_trigger_func") int handle_uprobe_byname(struct pt_regs *ctx) { - uprobe_byname_res = 1; + uprobe_byname_parm1 = PT_REGS_PARM1_CORE(ctx); + uprobe_byname_ran = 1; return 0; } SEC("uretprobe//proc/self/exe:autoattach_trigger_func") int handle_uretprobe_byname(struct pt_regs *ctx) { - uretprobe_byname_res = 2; + uretprobe_byname_rc = PT_REGS_RC_CORE(ctx); + uretprobe_byname_ran = 2; return 0; } @@ -38,14 +47,26 @@ int handle_uretprobe_byname(struct pt_regs *ctx) SEC("uprobe/libc.so.6:malloc") int handle_uprobe_byname2(struct pt_regs *ctx) { - uprobe_byname2_res = 3; + int pid = bpf_get_current_pid_tgid() >> 32; + + /* ignore irrelevant invocations */ + if (test_pid != pid) + return 0; + uprobe_byname2_parm1 = PT_REGS_PARM1_CORE(ctx); + uprobe_byname2_ran = 3; return 0; } -SEC("uretprobe/libc.so.6:free") +SEC("uretprobe/libc.so.6:malloc") int handle_uretprobe_byname2(struct pt_regs *ctx) { - uretprobe_byname2_res = 4; + int pid = bpf_get_current_pid_tgid() >> 32; + + /* ignore irrelevant invocations */ + if (test_pid != pid) + return 0; + uretprobe_byname2_rc = (char *)PT_REGS_RC_CORE(ctx); + uretprobe_byname2_ran = 4; return 0; } |