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perf bpf: Add 'syscall_enter' probe helper for syscall enter tracepoints 

Allowing one to hook into the syscalls:sys_enter_NAME tracepoints,
an example is provided that hooks into the 'openat' syscall.

Using it with the probe:vfs_getname probe into getname_flags to get the
filename args as it is copied from userspace:

  # perf probe -l
  probe:vfs_getname    (on getname_flags:73@acme/git/linux/fs/namei.c with pathname)
  # perf trace -e probe:*getname,tools/perf/examples/bpf/sys_enter_openat.c cat /etc/passwd > /dev/null
     0.000 probe:vfs_getname:(ffffffffbd2a8983) pathname="/etc/ld.so.preload"
     0.022 syscalls:sys_enter_openat:dfd: CWD, filename: 0xafbe8da8, flags: CLOEXEC
     0.027 probe:vfs_getname:(ffffffffbd2a8983) pathname="/etc/ld.so.cache"
     0.054 syscalls:sys_enter_openat:dfd: CWD, filename: 0xafdf0ce0, flags: CLOEXEC
     0.057 probe:vfs_getname:(ffffffffbd2a8983) pathname="/lib64/libc.so.6"
     0.316 probe:vfs_getname:(ffffffffbd2a8983) pathname="/usr/lib/locale/locale-archive"
     0.375 syscalls:sys_enter_openat:dfd: CWD, filename: 0xe2b2b0b4
     0.379 probe:vfs_getname:(ffffffffbd2a8983) pathname="/etc/passwd"
  #

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: https://lkml.kernel.org/n/tip-2po9jcqv1qgj0koxlg8kkg30@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
hifive-unleashed-5.1
Arnaldo Carvalho de Melo 2018-08-03 16:28:35 -03:00
parent 3c8b818640
commit dda9ac966d
2 changed files with 36 additions and 0 deletions
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33
tools/perf/examples/bpf/sys_enter_openat.c 100644
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@ -0,0 +1,33 @@
// SPDX-License-Identifier: GPL-2.0
/*
* Hook into 'openat' syscall entry tracepoint
*
* Test it with:
*
* perf trace -e tools/perf/examples/bpf/sys_enter_openat.c cat /etc/passwd > /dev/null
*
* It'll catch some openat syscalls related to the dynamic linked and
* the last one should be the one for '/etc/passwd'.
*
* The syscall_enter_openat_args can be used to get the syscall fields
* and use them for filtering calls, i.e. use in expressions for
* the return value.
*/
#include <bpf.h>
struct syscall_enter_openat_args {
unsigned long long unused;
long syscall_nr;
long dfd;
char *filename_ptr;
long flags;
long mode;
};
int syscall_enter(openat)(struct syscall_enter_openat_args *args)
{
return 1;
}
license(GPL);

3
tools/perf/include/bpf/bpf.h
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@ -9,6 +9,9 @@
#define probe(function, vars) \
SEC(#function "=" #function " " #vars) function
#define syscall_enter(name) \
SEC("syscalls:sys_enter_" #name) syscall_enter_ ## name
#define license(name) \
char _license[] SEC("license") = #name; \
int _version SEC("version") = LINUX_VERSION_CODE;