+++ /dev/null
-// 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);
+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0
-/*
- * Augment the filename syscalls with the contents of the filename pointer argument
- * filtering only those that do not start with /etc/.
- *
- * 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 unmodified,
- * which will be done as that feature is implemented in the next csets, for now
- * it will appear in a dump done by the default tracepoint handler in 'perf trace',
- * that uses bpf_output__fprintf() to just dump those contents, as done with
- * the bpf-output event associated with the __bpf_output__ map declared in
- * tools/perf/include/bpf/stdio.h.
- */
-
-#include <stdio.h>
-
-/* bpf-output associated map */
-bpf_map(__augmented_syscalls__, PERF_EVENT_ARRAY, int, u32, __NR_CPUS__);
-
-struct augmented_filename {
- int size;
- int reserved;
- char value[64];
-};
-
-#define augmented_filename_syscall_enter(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) \
-{ \
- char etc[6] = "/etc/"; \
- struct augmented_enter_##syscall##_args augmented_args = { .filename.reserved = 0, }; \
- 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 (__builtin_memcmp(augmented_args.filename.value, etc, 4) != 0) \
- return 0; \
- /* 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.filename.value) + \
- augmented_args.filename.size)); \
-}
-
-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_enter(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_enter(open);
-
-license(GPL);
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