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perf trace augmented_syscalls: Augment connect's 'sockaddr' arg

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As the first example of augmenting something other than a 'filename',
augment the 'struct sockaddr' argument for the 'connect' syscall:

  # perf trace -e tools/perf/examples/bpf/augmented_syscalls.c ssh -6 fedorapeople.org
     0.000 ssh/29669 connect(fd: 3, uservaddr: { .family: LOCAL, path: /var/run/nscd/socket }, addrlen: 110)
     0.042 ssh/29669 connect(fd: 3, uservaddr: { .family: LOCAL, path: /var/run/nscd/socket }, addrlen: 110)
     1.329 ssh/29669 connect(fd: 3, uservaddr: { .family: LOCAL, path: /var/run/nscd/socket }, addrlen: 110)
     1.362 ssh/29669 connect(fd: 3, uservaddr: { .family: LOCAL, path: /var/run/nscd/socket }, addrlen: 110)
     1.458 ssh/29669 connect(fd: 3, uservaddr: { .family: LOCAL, path: /var/run/nscd/socket }, addrlen: 110)
     1.478 ssh/29669 connect(fd: 3, uservaddr: { .family: LOCAL, path: /var/run/nscd/socket }, addrlen: 110)
     1.683 ssh/29669 connect(fd: 3<socket:[125942]>, uservaddr: { .family: INET, port: 53, addr: 192.168.43.1 }, addrlen: 16)
     4.710 ssh/29669 connect(fd: 3<socket:[125942]>, uservaddr: { .family: INET6, port: 22, addr: 2610:28:3090:3001:5054:ff:fea7:9474 }, addrlen: 28)
  root@fedorapeople.org: Permission denied (publickey).
  #

This is still just augmenting the syscalls:sys_enter_connect part, later
we'll wire this up to augment the enter+exit combo, like in the
tradicional 'perf trace' and 'strace' outputs.

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-s7l541cbiqb22ifio6z7dpf6@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Arnaldo Carvalho de Melo 2018-08-28 16:24:44 -03:00
parent 403f833d15
commit d5a7e6613b
5 changed files with 99 additions and 11 deletions
Download patch file Download diff file Expand all files Collapse all files

34
tools/perf/examples/bpf/augmented_syscalls.c
View file

@ -19,6 +19,7 @@
*/
#include <stdio.h>
#include <linux/socket.h>
struct bpf_map SEC("maps") __augmented_syscalls__ = {
.type = BPF_MAP_TYPE_PERF_EVENT_ARRAY,
@ -33,7 +34,7 @@ struct augmented_filename {
char value[256];
};
#define augmented_filename_syscall_enter(syscall) \
#define augmented_filename_syscall_enter(syscall) \
struct augmented_enter_##syscall##_args { \
struct syscall_enter_##syscall##_args args; \
struct augmented_filename filename; \
@ -94,4 +95,35 @@ struct syscall_enter_newstat_args {
augmented_filename_syscall_enter(newstat);
struct sockaddr;
struct syscall_enter_connect_args {
unsigned long long common_tp_fields;
long syscall_nr;
long fd;
struct sockaddr *addr_ptr;
unsigned long addrlen;
};
struct augmented_enter_connect_args {
struct syscall_enter_connect_args args;
struct sockaddr_storage addr;
};
int syscall_enter(connect)(struct syscall_enter_connect_args *args)
{
struct augmented_enter_connect_args augmented_args;
unsigned long addrlen = sizeof(augmented_args.addr);
probe_read(&augmented_args.args, sizeof(augmented_args.args), args);
#ifdef FIXME_CLANG_OPTIMIZATION_THAT_ACCESSES_USER_CONTROLLED_ADDRLEN_DESPITE_THIS_CHECK
if (addrlen > augmented_args.args.addrlen)
addrlen = augmented_args.args.addrlen;
#endif
probe_read(&augmented_args.addr, addrlen, args->addr_ptr);
perf_event_output(args, &__augmented_syscalls__, BPF_F_CURRENT_CPU, &augmented_args,
sizeof(augmented_args) - sizeof(augmented_args.addr) + addrlen);
return 0;
}
license(GPL);