mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-05 18:14:07 +08:00
76a06125dd
To make the code more compact, end result is the same: # perf trace -e /home/acme/git/perf/tools/perf/examples/bpf/augmented_syscalls.c sleep 1 0.000 ( 0.008 ms): sleep/9663 openat(dfd: CWD, filename: "/etc/ld.so.cache", flags: RDONLY|CLOEXEC) = 3 0.022 ( 0.005 ms): sleep/9663 openat(dfd: CWD, filename: "/lib64/libc.so.6", flags: RDONLY|CLOEXEC) = 3 0.226 ( 0.006 ms): sleep/9663 openat(dfd: CWD, filename: "/usr/lib/locale/locale-archive", flags: RDONLY|CLOEXEC) = 3 # Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Luis Cláudio Gonçalves <lclaudio@redhat.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Wang Nan <wangnan0@huawei.com> Link: https://lkml.kernel.org/n/tip-23z08bgizqnbc3qdsyl7jyyg@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
170 lines
5.1 KiB
C
170 lines
5.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* Augment syscalls with the contents of the pointer arguments.
|
|
*
|
|
* Test it with:
|
|
*
|
|
* perf trace -e tools/perf/examples/bpf/augmented_syscalls.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'.
|
|
*
|
|
* This matches what is marshalled into the raw_syscall:sys_enter payload
|
|
* expected by the 'perf trace' beautifiers, and can be used by them, that will
|
|
* check if perf_sample->raw_data is more than what is expected for each
|
|
* syscalls:sys_{enter,exit}_SYSCALL tracepoint, uing the extra data as the
|
|
* contents of pointer arguments.
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
#include <linux/socket.h>
|
|
|
|
/* bpf-output associated map */
|
|
bpf_map(__augmented_syscalls__, PERF_EVENT_ARRAY, int, u32, __NR_CPUS__);
|
|
|
|
struct syscall_exit_args {
|
|
unsigned long long common_tp_fields;
|
|
long syscall_nr;
|
|
long ret;
|
|
};
|
|
|
|
struct augmented_filename {
|
|
unsigned int size;
|
|
int reserved;
|
|
char value[256];
|
|
};
|
|
|
|
#define augmented_filename_syscall(syscall) \
|
|
struct augmented_enter_##syscall##_args { \
|
|
struct syscall_enter_##syscall##_args args; \
|
|
struct augmented_filename filename; \
|
|
}; \
|
|
int syscall_enter(syscall)(struct syscall_enter_##syscall##_args *args) \
|
|
{ \
|
|
struct augmented_enter_##syscall##_args augmented_args = { .filename.reserved = 0, }; \
|
|
unsigned int len = sizeof(augmented_args); \
|
|
probe_read(&augmented_args.args, sizeof(augmented_args.args), args); \
|
|
augmented_args.filename.size = probe_read_str(&augmented_args.filename.value, \
|
|
sizeof(augmented_args.filename.value), \
|
|
args->filename_ptr); \
|
|
if (augmented_args.filename.size < sizeof(augmented_args.filename.value)) { \
|
|
len -= sizeof(augmented_args.filename.value) - augmented_args.filename.size; \
|
|
len &= sizeof(augmented_args.filename.value) - 1; \
|
|
} \
|
|
/* If perf_event_output fails, return non-zero so that it gets recorded unaugmented */ \
|
|
return perf_event_output(args, &__augmented_syscalls__, BPF_F_CURRENT_CPU, \
|
|
&augmented_args, len); \
|
|
} \
|
|
int syscall_exit(syscall)(struct syscall_exit_args *args) \
|
|
{ \
|
|
return 1; /* 0 as soon as we start copying data returned by the kernel, e.g. 'read' */ \
|
|
}
|
|
|
|
struct syscall_enter_openat_args {
|
|
unsigned long long common_tp_fields;
|
|
long syscall_nr;
|
|
long dfd;
|
|
char *filename_ptr;
|
|
long flags;
|
|
long mode;
|
|
};
|
|
|
|
augmented_filename_syscall(openat);
|
|
|
|
struct syscall_enter_open_args {
|
|
unsigned long long common_tp_fields;
|
|
long syscall_nr;
|
|
char *filename_ptr;
|
|
long flags;
|
|
long mode;
|
|
};
|
|
|
|
augmented_filename_syscall(open);
|
|
|
|
struct syscall_enter_inotify_add_watch_args {
|
|
unsigned long long common_tp_fields;
|
|
long syscall_nr;
|
|
long fd;
|
|
char *filename_ptr;
|
|
long mask;
|
|
};
|
|
|
|
augmented_filename_syscall(inotify_add_watch);
|
|
|
|
struct statbuf;
|
|
|
|
struct syscall_enter_newstat_args {
|
|
unsigned long long common_tp_fields;
|
|
long syscall_nr;
|
|
char *filename_ptr;
|
|
struct stat *statbuf;
|
|
};
|
|
|
|
augmented_filename_syscall(newstat);
|
|
|
|
#ifndef _K_SS_MAXSIZE
|
|
#define _K_SS_MAXSIZE 128
|
|
#endif
|
|
|
|
#define augmented_sockaddr_syscall(syscall) \
|
|
struct augmented_enter_##syscall##_args { \
|
|
struct syscall_enter_##syscall##_args args; \
|
|
struct sockaddr_storage addr; \
|
|
}; \
|
|
int syscall_enter(syscall)(struct syscall_enter_##syscall##_args *args) \
|
|
{ \
|
|
struct augmented_enter_##syscall##_args augmented_args; \
|
|
unsigned long addrlen = sizeof(augmented_args.addr); \
|
|
probe_read(&augmented_args.args, sizeof(augmented_args.args), args); \
|
|
/* FIXME_CLANG_OPTIMIZATION_THAT_ACCESSES_USER_CONTROLLED_ADDRLEN_DESPITE_THIS_CHECK */ \
|
|
/* if (addrlen > augmented_args.args.addrlen) */ \
|
|
/* addrlen = augmented_args.args.addrlen; */ \
|
|
/* */ \
|
|
probe_read(&augmented_args.addr, addrlen, args->addr_ptr); \
|
|
/* If perf_event_output fails, return non-zero so that it gets recorded unaugmented */ \
|
|
return perf_event_output(args, &__augmented_syscalls__, BPF_F_CURRENT_CPU, \
|
|
&augmented_args, \
|
|
sizeof(augmented_args) - sizeof(augmented_args.addr) + addrlen);\
|
|
} \
|
|
int syscall_exit(syscall)(struct syscall_exit_args *args) \
|
|
{ \
|
|
return 1; /* 0 as soon as we start copying data returned by the kernel, e.g. 'read' */ \
|
|
}
|
|
|
|
struct sockaddr;
|
|
|
|
struct syscall_enter_bind_args {
|
|
unsigned long long common_tp_fields;
|
|
long syscall_nr;
|
|
long fd;
|
|
struct sockaddr *addr_ptr;
|
|
unsigned long addrlen;
|
|
};
|
|
|
|
augmented_sockaddr_syscall(bind);
|
|
|
|
struct syscall_enter_connect_args {
|
|
unsigned long long common_tp_fields;
|
|
long syscall_nr;
|
|
long fd;
|
|
struct sockaddr *addr_ptr;
|
|
unsigned long addrlen;
|
|
};
|
|
|
|
augmented_sockaddr_syscall(connect);
|
|
|
|
struct syscall_enter_sendto_args {
|
|
unsigned long long common_tp_fields;
|
|
long syscall_nr;
|
|
long fd;
|
|
void *buff;
|
|
long len;
|
|
unsigned long flags;
|
|
struct sockaddr *addr_ptr;
|
|
long addr_len;
|
|
};
|
|
|
|
augmented_sockaddr_syscall(sendto);
|
|
|
|
license(GPL);
|