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-rw-r--r--samples/bpf/Makefile10
-rw-r--r--samples/bpf/bpf_helpers.h18
-rw-r--r--samples/bpf/fds_example.c183
-rw-r--r--samples/bpf/libbpf.c19
-rw-r--r--samples/bpf/libbpf.h11
-rw-r--r--samples/bpf/tcbpf1_kern.c24
-rw-r--r--samples/bpf/test_verifier.c357
-rw-r--r--samples/bpf/trace_output_kern.c31
-rw-r--r--samples/bpf/trace_output_user.c196
-rw-r--r--samples/kprobes/jprobe_example.c14
-rw-r--r--samples/kprobes/kprobe_example.c6
-rw-r--r--samples/kprobes/kretprobe_example.c4
-rw-r--r--samples/trace_events/trace-events-sample.h6
13 files changed, 853 insertions, 26 deletions
diff --git a/samples/bpf/Makefile b/samples/bpf/Makefile
index 63e7d50e6a4f..79b4596b5f9a 100644
--- a/samples/bpf/Makefile
+++ b/samples/bpf/Makefile
@@ -4,6 +4,7 @@ obj- := dummy.o
# List of programs to build
hostprogs-y := test_verifier test_maps
hostprogs-y += sock_example
+hostprogs-y += fds_example
hostprogs-y += sockex1
hostprogs-y += sockex2
hostprogs-y += sockex3
@@ -13,11 +14,13 @@ hostprogs-y += tracex3
hostprogs-y += tracex4
hostprogs-y += tracex5
hostprogs-y += tracex6
+hostprogs-y += trace_output
hostprogs-y += lathist
test_verifier-objs := test_verifier.o libbpf.o
test_maps-objs := test_maps.o libbpf.o
sock_example-objs := sock_example.o libbpf.o
+fds_example-objs := bpf_load.o libbpf.o fds_example.o
sockex1-objs := bpf_load.o libbpf.o sockex1_user.o
sockex2-objs := bpf_load.o libbpf.o sockex2_user.o
sockex3-objs := bpf_load.o libbpf.o sockex3_user.o
@@ -27,6 +30,7 @@ tracex3-objs := bpf_load.o libbpf.o tracex3_user.o
tracex4-objs := bpf_load.o libbpf.o tracex4_user.o
tracex5-objs := bpf_load.o libbpf.o tracex5_user.o
tracex6-objs := bpf_load.o libbpf.o tracex6_user.o
+trace_output-objs := bpf_load.o libbpf.o trace_output_user.o
lathist-objs := bpf_load.o libbpf.o lathist_user.o
# Tell kbuild to always build the programs
@@ -40,12 +44,14 @@ always += tracex3_kern.o
always += tracex4_kern.o
always += tracex5_kern.o
always += tracex6_kern.o
+always += trace_output_kern.o
always += tcbpf1_kern.o
always += lathist_kern.o
HOSTCFLAGS += -I$(objtree)/usr/include
HOSTCFLAGS_bpf_load.o += -I$(objtree)/usr/include -Wno-unused-variable
+HOSTLOADLIBES_fds_example += -lelf
HOSTLOADLIBES_sockex1 += -lelf
HOSTLOADLIBES_sockex2 += -lelf
HOSTLOADLIBES_sockex3 += -lelf
@@ -55,6 +61,7 @@ HOSTLOADLIBES_tracex3 += -lelf
HOSTLOADLIBES_tracex4 += -lelf -lrt
HOSTLOADLIBES_tracex5 += -lelf
HOSTLOADLIBES_tracex6 += -lelf
+HOSTLOADLIBES_trace_output += -lelf -lrt
HOSTLOADLIBES_lathist += -lelf
# point this to your LLVM backend with bpf support
@@ -64,3 +71,6 @@ $(obj)/%.o: $(src)/%.c
clang $(NOSTDINC_FLAGS) $(LINUXINCLUDE) $(EXTRA_CFLAGS) \
-D__KERNEL__ -Wno-unused-value -Wno-pointer-sign \
-O2 -emit-llvm -c $< -o -| $(LLC) -march=bpf -filetype=obj -o $@
+ clang $(NOSTDINC_FLAGS) $(LINUXINCLUDE) $(EXTRA_CFLAGS) \
+ -D__KERNEL__ -Wno-unused-value -Wno-pointer-sign \
+ -O2 -emit-llvm -c $< -o -| $(LLC) -march=bpf -filetype=asm -o $@.s
diff --git a/samples/bpf/bpf_helpers.h b/samples/bpf/bpf_helpers.h
index 3a44d3a272af..7ad19e1dbaf4 100644
--- a/samples/bpf/bpf_helpers.h
+++ b/samples/bpf/bpf_helpers.h
@@ -33,6 +33,12 @@ static int (*bpf_get_current_comm)(void *buf, int buf_size) =
(void *) BPF_FUNC_get_current_comm;
static int (*bpf_perf_event_read)(void *map, int index) =
(void *) BPF_FUNC_perf_event_read;
+static int (*bpf_clone_redirect)(void *ctx, int ifindex, int flags) =
+ (void *) BPF_FUNC_clone_redirect;
+static int (*bpf_redirect)(int ifindex, int flags) =
+ (void *) BPF_FUNC_redirect;
+static int (*bpf_perf_event_output)(void *ctx, void *map, int index, void *data, int size) =
+ (void *) BPF_FUNC_perf_event_output;
/* llvm builtin functions that eBPF C program may use to
* emit BPF_LD_ABS and BPF_LD_IND instructions
@@ -86,5 +92,17 @@ static int (*bpf_l4_csum_replace)(void *ctx, int off, int from, int to, int flag
#define PT_REGS_RC(x) ((x)->gprs[2])
#define PT_REGS_SP(x) ((x)->gprs[15])
+#elif defined(__aarch64__)
+
+#define PT_REGS_PARM1(x) ((x)->regs[0])
+#define PT_REGS_PARM2(x) ((x)->regs[1])
+#define PT_REGS_PARM3(x) ((x)->regs[2])
+#define PT_REGS_PARM4(x) ((x)->regs[3])
+#define PT_REGS_PARM5(x) ((x)->regs[4])
+#define PT_REGS_RET(x) ((x)->regs[30])
+#define PT_REGS_FP(x) ((x)->regs[29]) /* Works only with CONFIG_FRAME_POINTER */
+#define PT_REGS_RC(x) ((x)->regs[0])
+#define PT_REGS_SP(x) ((x)->sp)
+
#endif
#endif
diff --git a/samples/bpf/fds_example.c b/samples/bpf/fds_example.c
new file mode 100644
index 000000000000..e2fd16c3d0f0
--- /dev/null
+++ b/samples/bpf/fds_example.c
@@ -0,0 +1,183 @@
+#include <linux/unistd.h>
+#include <linux/bpf.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <unistd.h>
+#include <string.h>
+#include <assert.h>
+#include <errno.h>
+
+#include <sys/types.h>
+#include <sys/socket.h>
+
+#include "bpf_load.h"
+#include "libbpf.h"
+
+#define BPF_F_PIN (1 << 0)
+#define BPF_F_GET (1 << 1)
+#define BPF_F_PIN_GET (BPF_F_PIN | BPF_F_GET)
+
+#define BPF_F_KEY (1 << 2)
+#define BPF_F_VAL (1 << 3)
+#define BPF_F_KEY_VAL (BPF_F_KEY | BPF_F_VAL)
+
+#define BPF_M_UNSPEC 0
+#define BPF_M_MAP 1
+#define BPF_M_PROG 2
+
+static void usage(void)
+{
+ printf("Usage: fds_example [...]\n");
+ printf(" -F <file> File to pin/get object\n");
+ printf(" -P |- pin object\n");
+ printf(" -G `- get object\n");
+ printf(" -m eBPF map mode\n");
+ printf(" -k <key> |- map key\n");
+ printf(" -v <value> `- map value\n");
+ printf(" -p eBPF prog mode\n");
+ printf(" -o <object> `- object file\n");
+ printf(" -h Display this help.\n");
+}
+
+static int bpf_map_create(void)
+{
+ return bpf_create_map(BPF_MAP_TYPE_ARRAY, sizeof(uint32_t),
+ sizeof(uint32_t), 1024);
+}
+
+static int bpf_prog_create(const char *object)
+{
+ static const struct bpf_insn insns[] = {
+ BPF_MOV64_IMM(BPF_REG_0, 1),
+ BPF_EXIT_INSN(),
+ };
+
+ if (object) {
+ assert(!load_bpf_file((char *)object));
+ return prog_fd[0];
+ } else {
+ return bpf_prog_load(BPF_PROG_TYPE_SOCKET_FILTER,
+ insns, sizeof(insns), "GPL", 0);
+ }
+}
+
+static int bpf_do_map(const char *file, uint32_t flags, uint32_t key,
+ uint32_t value)
+{
+ int fd, ret;
+
+ if (flags & BPF_F_PIN) {
+ fd = bpf_map_create();
+ printf("bpf: map fd:%d (%s)\n", fd, strerror(errno));
+ assert(fd > 0);
+
+ ret = bpf_obj_pin(fd, file);
+ printf("bpf: pin ret:(%d,%s)\n", ret, strerror(errno));
+ assert(ret == 0);
+ } else {
+ fd = bpf_obj_get(file);
+ printf("bpf: get fd:%d (%s)\n", fd, strerror(errno));
+ assert(fd > 0);
+ }
+
+ if ((flags & BPF_F_KEY_VAL) == BPF_F_KEY_VAL) {
+ ret = bpf_update_elem(fd, &key, &value, 0);
+ printf("bpf: fd:%d u->(%u:%u) ret:(%d,%s)\n", fd, key, value,
+ ret, strerror(errno));
+ assert(ret == 0);
+ } else if (flags & BPF_F_KEY) {
+ ret = bpf_lookup_elem(fd, &key, &value);
+ printf("bpf: fd:%d l->(%u):%u ret:(%d,%s)\n", fd, key, value,
+ ret, strerror(errno));
+ assert(ret == 0);
+ }
+
+ return 0;
+}
+
+static int bpf_do_prog(const char *file, uint32_t flags, const char *object)
+{
+ int fd, sock, ret;
+
+ if (flags & BPF_F_PIN) {
+ fd = bpf_prog_create(object);
+ printf("bpf: prog fd:%d (%s)\n", fd, strerror(errno));
+ assert(fd > 0);
+
+ ret = bpf_obj_pin(fd, file);
+ printf("bpf: pin ret:(%d,%s)\n", ret, strerror(errno));
+ assert(ret == 0);
+ } else {
+ fd = bpf_obj_get(file);
+ printf("bpf: get fd:%d (%s)\n", fd, strerror(errno));
+ assert(fd > 0);
+ }
+
+ sock = open_raw_sock("lo");
+ assert(sock > 0);
+
+ ret = setsockopt(sock, SOL_SOCKET, SO_ATTACH_BPF, &fd, sizeof(fd));
+ printf("bpf: sock:%d <- fd:%d attached ret:(%d,%s)\n", sock, fd,
+ ret, strerror(errno));
+ assert(ret == 0);
+
+ return 0;
+}
+
+int main(int argc, char **argv)
+{
+ const char *file = NULL, *object = NULL;
+ uint32_t key = 0, value = 0, flags = 0;
+ int opt, mode = BPF_M_UNSPEC;
+
+ while ((opt = getopt(argc, argv, "F:PGmk:v:po:")) != -1) {
+ switch (opt) {
+ /* General args */
+ case 'F':
+ file = optarg;
+ break;
+ case 'P':
+ flags |= BPF_F_PIN;
+ break;
+ case 'G':
+ flags |= BPF_F_GET;
+ break;
+ /* Map-related args */
+ case 'm':
+ mode = BPF_M_MAP;
+ break;
+ case 'k':
+ key = strtoul(optarg, NULL, 0);
+ flags |= BPF_F_KEY;
+ break;
+ case 'v':
+ value = strtoul(optarg, NULL, 0);
+ flags |= BPF_F_VAL;
+ break;
+ /* Prog-related args */
+ case 'p':
+ mode = BPF_M_PROG;
+ break;
+ case 'o':
+ object = optarg;
+ break;
+ default:
+ goto out;
+ }
+ }
+
+ if (!(flags & BPF_F_PIN_GET) || !file)
+ goto out;
+
+ switch (mode) {
+ case BPF_M_MAP:
+ return bpf_do_map(file, flags, key, value);
+ case BPF_M_PROG:
+ return bpf_do_prog(file, flags, object);
+ }
+out:
+ usage();
+ return -1;
+}
diff --git a/samples/bpf/libbpf.c b/samples/bpf/libbpf.c
index 7e1efa7e2ed7..65a8d48d2799 100644
--- a/samples/bpf/libbpf.c
+++ b/samples/bpf/libbpf.c
@@ -103,6 +103,25 @@ int bpf_prog_load(enum bpf_prog_type prog_type,
return syscall(__NR_bpf, BPF_PROG_LOAD, &attr, sizeof(attr));
}
+int bpf_obj_pin(int fd, const char *pathname)
+{
+ union bpf_attr attr = {
+ .pathname = ptr_to_u64((void *)pathname),
+ .bpf_fd = fd,
+ };
+
+ return syscall(__NR_bpf, BPF_OBJ_PIN, &attr, sizeof(attr));
+}
+
+int bpf_obj_get(const char *pathname)
+{
+ union bpf_attr attr = {
+ .pathname = ptr_to_u64((void *)pathname),
+ };
+
+ return syscall(__NR_bpf, BPF_OBJ_GET, &attr, sizeof(attr));
+}
+
int open_raw_sock(const char *name)
{
struct sockaddr_ll sll;
diff --git a/samples/bpf/libbpf.h b/samples/bpf/libbpf.h
index 7235e292a03b..014aacf916e4 100644
--- a/samples/bpf/libbpf.h
+++ b/samples/bpf/libbpf.h
@@ -15,6 +15,9 @@ int bpf_prog_load(enum bpf_prog_type prog_type,
const struct bpf_insn *insns, int insn_len,
const char *license, int kern_version);
+int bpf_obj_pin(int fd, const char *pathname);
+int bpf_obj_get(const char *pathname);
+
#define LOG_BUF_SIZE 65536
extern char bpf_log_buf[LOG_BUF_SIZE];
@@ -64,6 +67,14 @@ extern char bpf_log_buf[LOG_BUF_SIZE];
.off = 0, \
.imm = 0 })
+#define BPF_MOV32_REG(DST, SRC) \
+ ((struct bpf_insn) { \
+ .code = BPF_ALU | BPF_MOV | BPF_X, \
+ .dst_reg = DST, \
+ .src_reg = SRC, \
+ .off = 0, \
+ .imm = 0 })
+
/* Short form of mov, dst_reg = imm32 */
#define BPF_MOV64_IMM(DST, IMM) \
diff --git a/samples/bpf/tcbpf1_kern.c b/samples/bpf/tcbpf1_kern.c
index 9bfb2eb34563..fa051b3d53ee 100644
--- a/samples/bpf/tcbpf1_kern.c
+++ b/samples/bpf/tcbpf1_kern.c
@@ -5,7 +5,7 @@
#include <uapi/linux/in.h>
#include <uapi/linux/tcp.h>
#include <uapi/linux/filter.h>
-
+#include <uapi/linux/pkt_cls.h>
#include "bpf_helpers.h"
/* compiler workaround */
@@ -64,4 +64,26 @@ int bpf_prog1(struct __sk_buff *skb)
return 0;
}
+SEC("redirect_xmit")
+int _redirect_xmit(struct __sk_buff *skb)
+{
+ return bpf_redirect(skb->ifindex + 1, 0);
+}
+SEC("redirect_recv")
+int _redirect_recv(struct __sk_buff *skb)
+{
+ return bpf_redirect(skb->ifindex + 1, 1);
+}
+SEC("clone_redirect_xmit")
+int _clone_redirect_xmit(struct __sk_buff *skb)
+{
+ bpf_clone_redirect(skb, skb->ifindex + 1, 0);
+ return TC_ACT_SHOT;
+}
+SEC("clone_redirect_recv")
+int _clone_redirect_recv(struct __sk_buff *skb)
+{
+ bpf_clone_redirect(skb, skb->ifindex + 1, 1);
+ return TC_ACT_SHOT;
+}
char _license[] SEC("license") = "GPL";
diff --git a/samples/bpf/test_verifier.c b/samples/bpf/test_verifier.c
index ee0f110c9c54..563c507c0a09 100644
--- a/samples/bpf/test_verifier.c
+++ b/samples/bpf/test_verifier.c
@@ -15,20 +15,27 @@
#include <string.h>
#include <linux/filter.h>
#include <stddef.h>
+#include <stdbool.h>
+#include <sys/resource.h>
#include "libbpf.h"
#define MAX_INSNS 512
#define ARRAY_SIZE(x) (sizeof(x) / sizeof(*(x)))
+#define MAX_FIXUPS 8
+
struct bpf_test {
const char *descr;
struct bpf_insn insns[MAX_INSNS];
- int fixup[32];
+ int fixup[MAX_FIXUPS];
+ int prog_array_fixup[MAX_FIXUPS];
const char *errstr;
+ const char *errstr_unpriv;
enum {
+ UNDEF,
ACCEPT,
REJECT
- } result;
+ } result, result_unpriv;
enum bpf_prog_type prog_type;
};
@@ -96,6 +103,7 @@ static struct bpf_test tests[] = {
BPF_EXIT_INSN(),
},
.errstr = "invalid BPF_LD_IMM insn",
+ .errstr_unpriv = "R1 pointer comparison",
.result = REJECT,
},
{
@@ -109,6 +117,7 @@ static struct bpf_test tests[] = {
BPF_EXIT_INSN(),
},
.errstr = "invalid BPF_LD_IMM insn",
+ .errstr_unpriv = "R1 pointer comparison",
.result = REJECT,
},
{
@@ -219,6 +228,7 @@ static struct bpf_test tests[] = {
BPF_EXIT_INSN(),
},
.errstr = "R0 !read_ok",
+ .errstr_unpriv = "R1 pointer comparison",
.result = REJECT,
},
{
@@ -294,7 +304,9 @@ static struct bpf_test tests[] = {
BPF_MOV64_REG(BPF_REG_0, BPF_REG_2),
BPF_EXIT_INSN(),
},
+ .errstr_unpriv = "R0 leaks addr",
.result = ACCEPT,
+ .result_unpriv = REJECT,
},
{
"check corrupted spill/fill",
@@ -310,6 +322,7 @@ static struct bpf_test tests[] = {
BPF_EXIT_INSN(),
},
+ .errstr_unpriv = "attempt to corrupt spilled",
.errstr = "corrupted spill",
.result = REJECT,
},
@@ -473,6 +486,7 @@ static struct bpf_test tests[] = {
},
.fixup = {3},
.errstr = "R0 invalid mem access",
+ .errstr_unpriv = "R0 leaks addr",
.result = REJECT,
},
{
@@ -495,6 +509,8 @@ static struct bpf_test tests[] = {
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
},
+ .errstr_unpriv = "R1 pointer comparison",
+ .result_unpriv = REJECT,
.result = ACCEPT,
},
{
@@ -521,6 +537,8 @@ static struct bpf_test tests[] = {
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
},
+ .errstr_unpriv = "R1 pointer comparison",
+ .result_unpriv = REJECT,
.result = ACCEPT,
},
{
@@ -555,6 +573,8 @@ static struct bpf_test tests[] = {
BPF_EXIT_INSN(),
},
.fixup = {24},
+ .errstr_unpriv = "R1 pointer comparison",
+ .result_unpriv = REJECT,
.result = ACCEPT,
},
{
@@ -603,6 +623,8 @@ static struct bpf_test tests[] = {
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
},
+ .errstr_unpriv = "R1 pointer comparison",
+ .result_unpriv = REJECT,
.result = ACCEPT,
},
{
@@ -642,6 +664,8 @@ static struct bpf_test tests[] = {
BPF_MOV64_IMM(BPF_REG_0, 0),
BPF_EXIT_INSN(),
},
+ .errstr_unpriv = "R1 pointer comparison",
+ .result_unpriv = REJECT,
.result = ACCEPT,
},
{
@@ -699,6 +723,7 @@ static struct bpf_test tests[] = {
},
.fixup = {4},
.errstr = "different pointers",
+ .errstr_unpriv = "R1 pointer comparison",
.result = REJECT,
},
{
@@ -720,6 +745,7 @@ static struct bpf_test tests[] = {
},
.fixup = {6},
.errstr = "different pointers",
+ .errstr_unpriv = "R1 pointer comparison",
.result = REJECT,
},
{
@@ -742,6 +768,7 @@ static struct bpf_test tests[] = {
},
.fixup = {7},
.errstr = "different pointers",
+ .errstr_unpriv = "R1 pointer comparison",
.result = REJECT,
},
{
@@ -752,6 +779,7 @@ static struct bpf_test tests[] = {
BPF_EXIT_INSN(),
},
.errstr = "invalid bpf_context access",
+ .errstr_unpriv = "R1 leaks addr",
.result = REJECT,
},
{
@@ -762,6 +790,7 @@ static struct bpf_test tests[] = {
BPF_EXIT_INSN(),
},
.errstr = "invalid bpf_context access",
+ .errstr_unpriv = "R1 leaks addr",
.result = REJECT,
},
{
@@ -772,16 +801,18 @@ static struct bpf_test tests[] = {
BPF_EXIT_INSN(),
},
.errstr = "invalid bpf_context access",
+ .errstr_unpriv = "R1 leaks addr",
.result = REJECT,
},
{
"check out of range skb->cb access",
.insns = {
BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_1,
- offsetof(struct __sk_buff, cb[60])),
+ offsetof(struct __sk_buff, cb[0]) + 256),
BPF_EXIT_INSN(),
},
.errstr = "invalid bpf_context access",
+ .errstr_unpriv = "",
.result = REJECT,
.prog_type = BPF_PROG_TYPE_SCHED_ACT,
},
@@ -803,6 +834,8 @@ static struct bpf_test tests[] = {
BPF_EXIT_INSN(),
},
.result = ACCEPT,
+ .errstr_unpriv = "R1 leaks addr",
+ .result_unpriv = REJECT,
},
{
"write skb fields from tc_cls_act prog",
@@ -819,6 +852,8 @@ static struct bpf_test tests[] = {
offsetof(struct __sk_buff, cb[3])),
BPF_EXIT_INSN(),
},
+ .errstr_unpriv = "",
+ .result_unpriv = REJECT,
.result = ACCEPT,
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
},
@@ -881,6 +916,270 @@ static struct bpf_test tests[] = {
.result = REJECT,
.errstr = "invalid stack off=0 size=8",
},
+ {
+ "unpriv: return pointer",
+ .insns = {
+ BPF_MOV64_REG(BPF_REG_0, BPF_REG_10),
+ BPF_EXIT_INSN(),
+ },
+ .result = ACCEPT,
+ .result_unpriv = REJECT,
+ .errstr_unpriv = "R0 leaks addr",
+ },
+ {
+ "unpriv: add const to pointer",
+ .insns = {
+ BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 8),
+ BPF_MOV64_IMM(BPF_REG_0, 0),
+ BPF_EXIT_INSN(),
+ },
+ .result = ACCEPT,
+ .result_unpriv = REJECT,
+ .errstr_unpriv = "R1 pointer arithmetic",
+ },
+ {
+ "unpriv: add pointer to pointer",
+ .insns = {
+ BPF_ALU64_REG(BPF_ADD, BPF_REG_1, BPF_REG_10),
+ BPF_MOV64_IMM(BPF_REG_0, 0),
+ BPF_EXIT_INSN(),
+ },
+ .result = ACCEPT,
+ .result_unpriv = REJECT,
+ .errstr_unpriv = "R1 pointer arithmetic",
+ },
+ {
+ "unpriv: neg pointer",
+ .insns = {
+ BPF_ALU64_IMM(BPF_NEG, BPF_REG_1, 0),
+ BPF_MOV64_IMM(BPF_REG_0, 0),
+ BPF_EXIT_INSN(),
+ },
+ .result = ACCEPT,
+ .result_unpriv = REJECT,
+ .errstr_unpriv = "R1 pointer arithmetic",
+ },
+ {
+ "unpriv: cmp pointer with const",
+ .insns = {
+ BPF_JMP_IMM(BPF_JEQ, BPF_REG_1, 0, 0),
+ BPF_MOV64_IMM(BPF_REG_0, 0),
+ BPF_EXIT_INSN(),
+ },
+ .result = ACCEPT,
+ .result_unpriv = REJECT,
+ .errstr_unpriv = "R1 pointer comparison",
+ },
+ {
+ "unpriv: cmp pointer with pointer",
+ .insns = {
+ BPF_JMP_REG(BPF_JEQ, BPF_REG_1, BPF_REG_10, 0),
+ BPF_MOV64_IMM(BPF_REG_0, 0),
+ BPF_EXIT_INSN(),
+ },
+ .result = ACCEPT,
+ .result_unpriv = REJECT,
+ .errstr_unpriv = "R10 pointer comparison",
+ },
+ {
+ "unpriv: check that printk is disallowed",
+ .insns = {
+ BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0),
+ BPF_MOV64_REG(BPF_REG_1, BPF_REG_10),
+ BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, -8),
+ BPF_MOV64_IMM(BPF_REG_2, 8),
+ BPF_MOV64_REG(BPF_REG_3, BPF_REG_1),
+ BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_trace_printk),
+ BPF_MOV64_IMM(BPF_REG_0, 0),
+ BPF_EXIT_INSN(),
+ },
+ .errstr_unpriv = "unknown func 6",
+ .result_unpriv = REJECT,
+ .result = ACCEPT,
+ },
+ {
+ "unpriv: pass pointer to helper function",
+ .insns = {
+ BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0),
+ BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
+ BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8),
+ BPF_LD_MAP_FD(BPF_REG_1, 0),
+ BPF_MOV64_REG(BPF_REG_3, BPF_REG_2),
+ BPF_MOV64_REG(BPF_REG_4, BPF_REG_2),
+ BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_update_elem),
+ BPF_MOV64_IMM(BPF_REG_0, 0),
+ BPF_EXIT_INSN(),
+ },
+ .fixup = {3},
+ .errstr_unpriv = "R4 leaks addr",
+ .result_unpriv = REJECT,
+ .result = ACCEPT,
+ },
+ {
+ "unpriv: indirectly pass pointer on stack to helper function",
+ .insns = {
+ BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_10, -8),
+ BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
+ BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8),
+ BPF_LD_MAP_FD(BPF_REG_1, 0),
+ BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_lookup_elem),
+ BPF_MOV64_IMM(BPF_REG_0, 0),
+ BPF_EXIT_INSN(),
+ },
+ .fixup = {3},
+ .errstr = "invalid indirect read from stack off -8+0 size 8",
+ .result = REJECT,
+ },
+ {
+ "unpriv: mangle pointer on stack 1",
+ .insns = {
+ BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_10, -8),
+ BPF_ST_MEM(BPF_W, BPF_REG_10, -8, 0),
+ BPF_MOV64_IMM(BPF_REG_0, 0),
+ BPF_EXIT_INSN(),
+ },
+ .errstr_unpriv = "attempt to corrupt spilled",
+ .result_unpriv = REJECT,
+ .result = ACCEPT,
+ },
+ {
+ "unpriv: mangle pointer on stack 2",
+ .insns = {
+ BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_10, -8),
+ BPF_ST_MEM(BPF_B, BPF_REG_10, -1, 0),
+ BPF_MOV64_IMM(BPF_REG_0, 0),
+ BPF_EXIT_INSN(),
+ },
+ .errstr_unpriv = "attempt to corrupt spilled",
+ .result_unpriv = REJECT,
+ .result = ACCEPT,
+ },
+ {
+ "unpriv: read pointer from stack in small chunks",
+ .insns = {
+ BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_10, -8),
+ BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_10, -8),
+ BPF_MOV64_IMM(BPF_REG_0, 0),
+ BPF_EXIT_INSN(),
+ },
+ .errstr = "invalid size",
+ .result = REJECT,
+ },
+ {
+ "unpriv: write pointer into ctx",
+ .insns = {
+ BPF_STX_MEM(BPF_DW, BPF_REG_1, BPF_REG_1, 0),
+ BPF_MOV64_IMM(BPF_REG_0, 0),
+ BPF_EXIT_INSN(),
+ },
+ .errstr_unpriv = "R1 leaks addr",
+ .result_unpriv = REJECT,
+ .errstr = "invalid bpf_context access",
+ .result = REJECT,
+ },
+ {
+ "unpriv: write pointer into map elem value",
+ .insns = {
+ BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0),
+ BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
+ BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8),
+ BPF_LD_MAP_FD(BPF_REG_1, 0),
+ BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_lookup_elem),
+ BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 1),
+ BPF_STX_MEM(BPF_DW, BPF_REG_0, BPF_REG_0, 0),
+ BPF_EXIT_INSN(),
+ },
+ .fixup = {3},
+ .errstr_unpriv = "R0 leaks addr",
+ .result_unpriv = REJECT,
+ .result = ACCEPT,
+ },
+ {
+ "unpriv: partial copy of pointer",
+ .insns = {
+ BPF_MOV32_REG(BPF_REG_1, BPF_REG_10),
+ BPF_MOV64_IMM(BPF_REG_0, 0),
+ BPF_EXIT_INSN(),
+ },
+ .errstr_unpriv = "R10 partial copy",
+ .result_unpriv = REJECT,
+ .result = ACCEPT,
+ },
+ {
+ "unpriv: pass pointer to tail_call",
+ .insns = {
+ BPF_MOV64_REG(BPF_REG_3, BPF_REG_1),
+ BPF_LD_MAP_FD(BPF_REG_2, 0),
+ BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_tail_call),
+ BPF_MOV64_IMM(BPF_REG_0, 0),
+ BPF_EXIT_INSN(),
+ },
+ .prog_array_fixup = {1},
+ .errstr_unpriv = "R3 leaks addr into helper",
+ .result_unpriv = REJECT,
+ .result = ACCEPT,
+ },
+ {
+ "unpriv: cmp map pointer with zero",
+ .insns = {
+ BPF_MOV64_IMM(BPF_REG_1, 0),
+ BPF_LD_MAP_FD(BPF_REG_1, 0),
+ BPF_JMP_IMM(BPF_JEQ, BPF_REG_1, 0, 0),
+ BPF_MOV64_IMM(BPF_REG_0, 0),
+ BPF_EXIT_INSN(),
+ },
+ .fixup = {1},
+ .errstr_unpriv = "R1 pointer comparison",
+ .result_unpriv = REJECT,
+ .result = ACCEPT,
+ },
+ {
+ "unpriv: write into frame pointer",
+ .insns = {
+ BPF_MOV64_REG(BPF_REG_10, BPF_REG_1),
+ BPF_MOV64_IMM(BPF_REG_0, 0),
+ BPF_EXIT_INSN(),
+ },
+ .errstr = "frame pointer is read only",
+ .result = REJECT,
+ },
+ {
+ "unpriv: cmp of frame pointer",
+ .insns = {
+ BPF_JMP_IMM(BPF_JEQ, BPF_REG_10, 0, 0),
+ BPF_MOV64_IMM(BPF_REG_0, 0),
+ BPF_EXIT_INSN(),
+ },
+ .errstr_unpriv = "R10 pointer comparison",
+ .result_unpriv = REJECT,
+ .result = ACCEPT,
+ },
+ {
+ "unpriv: cmp of stack pointer",
+ .insns = {
+ BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
+ BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8),
+ BPF_JMP_IMM(BPF_JEQ, BPF_REG_2, 0, 0),
+ BPF_MOV64_IMM(BPF_REG_0, 0),
+ BPF_EXIT_INSN(),
+ },
+ .errstr_unpriv = "R2 pointer comparison",
+ .result_unpriv = REJECT,
+ .result = ACCEPT,
+ },
+ {
+ "unpriv: obfuscate stack pointer",
+ .insns = {
+ BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
+ BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8),
+ BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8),
+ BPF_MOV64_IMM(BPF_REG_0, 0),
+ BPF_EXIT_INSN(),
+ },
+ .errstr_unpriv = "R2 pointer arithmetic",
+ .result_unpriv = REJECT,
+ .result = ACCEPT,
+ },
};
static int probe_filter_length(struct bpf_insn *fp)
@@ -896,13 +1195,24 @@ static int probe_filter_length(struct bpf_insn *fp)
static int create_map(void)
{
- long long key, value = 0;
int map_fd;
- map_fd = bpf_create_map(BPF_MAP_TYPE_HASH, sizeof(key), sizeof(value), 1024);
- if (map_fd < 0) {
+ map_fd = bpf_create_map(BPF_MAP_TYPE_HASH,
+ sizeof(long long), sizeof(long long), 1024);
+ if (map_fd < 0)
printf("failed to create map '%s'\n", strerror(errno));
- }
+
+ return map_fd;
+}
+
+static int create_prog_array(void)
+{
+ int map_fd;
+
+ map_fd = bpf_create_map(BPF_MAP_TYPE_PROG_ARRAY,
+ sizeof(int), sizeof(int), 4);
+ if (map_fd < 0)
+ printf("failed to create prog_array '%s'\n", strerror(errno));
return map_fd;
}
@@ -910,13 +1220,17 @@ static int create_map(void)
static int test(void)
{
int prog_fd, i, pass_cnt = 0, err_cnt = 0;
+ bool unpriv = geteuid() != 0;
for (i = 0; i < ARRAY_SIZE(tests); i++) {
struct bpf_insn *prog = tests[i].insns;
int prog_type = tests[i].prog_type;
int prog_len = probe_filter_length(prog);
int *fixup = tests[i].fixup;
- int map_fd = -1;
+ int *prog_array_fixup = tests[i].prog_array_fixup;
+ int expected_result;
+ const char *expected_errstr;
+ int map_fd = -1, prog_array_fd = -1;
if (*fixup) {
map_fd = create_map();
@@ -926,13 +1240,31 @@ static int test(void)
fixup++;
} while (*fixup);
}
+ if (*prog_array_fixup) {
+ prog_array_fd = create_prog_array();
+
+ do {
+ prog[*prog_array_fixup].imm = prog_array_fd;
+ prog_array_fixup++;
+ } while (*prog_array_fixup);
+ }
printf("#%d %s ", i, tests[i].descr);
prog_fd = bpf_prog_load(prog_type ?: BPF_PROG_TYPE_SOCKET_FILTER,
prog, prog_len * sizeof(struct bpf_insn),
"GPL", 0);
- if (tests[i].result == ACCEPT) {
+ if (unpriv && tests[i].result_unpriv != UNDEF)
+ expected_result = tests[i].result_unpriv;
+ else
+ expected_result = tests[i].result;
+
+ if (unpriv && tests[i].errstr_unpriv)
+ expected_errstr = tests[i].errstr_unpriv;
+ else
+ expected_errstr = tests[i].errstr;
+
+ if (expected_result == ACCEPT) {
if (prog_fd < 0) {
printf("FAIL\nfailed to load prog '%s'\n",
strerror(errno));
@@ -947,7 +1279,7 @@ static int test(void)
err_cnt++;
goto fail;
}
- if (strstr(bpf_log_buf, tests[i].errstr) == 0) {
+ if (strstr(bpf_log_buf, expected_errstr) == 0) {
printf("FAIL\nunexpected error message: %s",
bpf_log_buf);
err_cnt++;
@@ -960,6 +1292,8 @@ static int test(void)
fail:
if (map_fd >= 0)
close(map_fd);
+ if (prog_array_fd >= 0)
+ close(prog_array_fd);
close(prog_fd);
}
@@ -970,5 +1304,8 @@ fail:
int main(void)
{
+ struct rlimit r = {1 << 20, 1 << 20};
+
+ setrlimit(RLIMIT_MEMLOCK, &r);
return test();
}
diff --git a/samples/bpf/trace_output_kern.c b/samples/bpf/trace_output_kern.c
new file mode 100644
index 000000000000..8d8d1ec429eb
--- /dev/null
+++ b/samples/bpf/trace_output_kern.c
@@ -0,0 +1,31 @@
+#include <linux/ptrace.h>
+#include <linux/version.h>
+#include <uapi/linux/bpf.h>
+#include "bpf_helpers.h"
+
+struct bpf_map_def SEC("maps") my_map = {
+ .type = BPF_MAP_TYPE_PERF_EVENT_ARRAY,
+ .key_size = sizeof(int),
+ .value_size = sizeof(u32),
+ .max_entries = 2,
+};
+
+SEC("kprobe/sys_write")
+int bpf_prog1(struct pt_regs *ctx)
+{
+ struct S {
+ u64 pid;
+ u64 cookie;
+ } data;
+
+ memset(&data, 0, sizeof(data));
+ data.pid = bpf_get_current_pid_tgid();
+ data.cookie = 0x12345678;
+
+ bpf_perf_event_output(ctx, &my_map, 0, &data, sizeof(data));
+
+ return 0;
+}
+
+char _license[] SEC("license") = "GPL";
+u32 _version SEC("version") = LINUX_VERSION_CODE;
diff --git a/samples/bpf/trace_output_user.c b/samples/bpf/trace_output_user.c
new file mode 100644
index 000000000000..661a7d052f2c
--- /dev/null
+++ b/samples/bpf/trace_output_user.c
@@ -0,0 +1,196 @@
+/* This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ */
+#include <stdio.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <stdbool.h>
+#include <string.h>
+#include <fcntl.h>
+#include <poll.h>
+#include <sys/ioctl.h>
+#include <linux/perf_event.h>
+#include <linux/bpf.h>
+#include <errno.h>
+#include <assert.h>
+#include <sys/syscall.h>
+#include <sys/ioctl.h>
+#include <sys/mman.h>
+#include <time.h>
+#include <signal.h>
+#include "libbpf.h"
+#include "bpf_load.h"
+
+static int pmu_fd;
+
+int page_size;
+int page_cnt = 8;
+volatile struct perf_event_mmap_page *header;
+
+typedef void (*print_fn)(void *data, int size);
+
+static int perf_event_mmap(int fd)
+{
+ void *base;
+ int mmap_size;
+
+ page_size = getpagesize();
+ mmap_size = page_size * (page_cnt + 1);
+
+ base = mmap(NULL, mmap_size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
+ if (base == MAP_FAILED) {
+ printf("mmap err\n");
+ return -1;
+ }
+
+ header = base;
+ return 0;
+}
+
+static int perf_event_poll(int fd)
+{
+ struct pollfd pfd = { .fd = fd, .events = POLLIN };
+
+ return poll(&pfd, 1, 1000);
+}
+
+struct perf_event_sample {
+ struct perf_event_header header;
+ __u32 size;
+ char data[];
+};
+
+void perf_event_read(print_fn fn)
+{
+ __u64 data_tail = header->data_tail;
+ __u64 data_head = header->data_head;
+ __u64 buffer_size = page_cnt * page_size;
+ void *base, *begin, *end;
+ char buf[256];
+
+ asm volatile("" ::: "memory"); /* in real code it should be smp_rmb() */
+ if (data_head == data_tail)
+ return;
+
+ base = ((char *)header) + page_size;
+
+ begin = base + data_tail % buffer_size;
+ end = base + data_head % buffer_size;
+
+ while (begin != end) {
+ struct perf_event_sample *e;
+
+ e = begin;
+ if (begin + e->header.size > base + buffer_size) {
+ long len = base + buffer_size - begin;
+
+ assert(len < e->header.size);
+ memcpy(buf, begin, len);
+ memcpy(buf + len, base, e->header.size - len);
+ e = (void *) buf;
+ begin = base + e->header.size - len;
+ } else if (begin + e->header.size == base + buffer_size) {
+ begin = base;
+ } else {
+ begin += e->header.size;
+ }
+
+ if (e->header.type == PERF_RECORD_SAMPLE) {
+ fn(e->data, e->size);
+ } else if (e->header.type == PERF_RECORD_LOST) {
+ struct {
+ struct perf_event_header header;
+ __u64 id;
+ __u64 lost;
+ } *lost = (void *) e;
+ printf("lost %lld events\n", lost->lost);
+ } else {
+ printf("unknown event type=%d size=%d\n",
+ e->header.type, e->header.size);
+ }
+ }
+
+ __sync_synchronize(); /* smp_mb() */
+ header->data_tail = data_head;
+}
+
+static __u64 time_get_ns(void)
+{
+ struct timespec ts;
+
+ clock_gettime(CLOCK_MONOTONIC, &ts);
+ return ts.tv_sec * 1000000000ull + ts.tv_nsec;
+}
+
+static __u64 start_time;
+
+#define MAX_CNT 100000ll
+
+static void print_bpf_output(void *data, int size)
+{
+ static __u64 cnt;
+ struct {
+ __u64 pid;
+ __u64 cookie;
+ } *e = data;
+
+ if (e->cookie != 0x12345678) {
+ printf("BUG pid %llx cookie %llx sized %d\n",
+ e->pid, e->cookie, size);
+ kill(0, SIGINT);
+ }
+
+ cnt++;
+
+ if (cnt == MAX_CNT) {
+ printf("recv %lld events per sec\n",
+ MAX_CNT * 1000000000ll / (time_get_ns() - start_time));
+ kill(0, SIGINT);
+ }
+}
+
+static void test_bpf_perf_event(void)
+{
+ struct perf_event_attr attr = {
+ .sample_type = PERF_SAMPLE_RAW,
+ .type = PERF_TYPE_SOFTWARE,
+ .config = PERF_COUNT_SW_BPF_OUTPUT,
+ };
+ int key = 0;
+
+ pmu_fd = perf_event_open(&attr, -1/*pid*/, 0/*cpu*/, -1/*group_fd*/, 0);
+
+ assert(pmu_fd >= 0);
+ assert(bpf_update_elem(map_fd[0], &key, &pmu_fd, BPF_ANY) == 0);
+ ioctl(pmu_fd, PERF_EVENT_IOC_ENABLE, 0);
+}
+
+int main(int argc, char **argv)
+{
+ char filename[256];
+ FILE *f;
+
+ snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
+
+ if (load_bpf_file(filename)) {
+ printf("%s", bpf_log_buf);
+ return 1;
+ }
+
+ test_bpf_perf_event();
+
+ if (perf_event_mmap(pmu_fd) < 0)
+ return 1;
+
+ f = popen("taskset 1 dd if=/dev/zero of=/dev/null", "r");
+ (void) f;
+
+ start_time = time_get_ns();
+ for (;;) {
+ perf_event_poll(pmu_fd);
+ perf_event_read(print_bpf_output);
+ }
+
+ return 0;
+}
diff --git a/samples/kprobes/jprobe_example.c b/samples/kprobes/jprobe_example.c
index 9119ac6a8270..c285a3b8a9f1 100644
--- a/samples/kprobes/jprobe_example.c
+++ b/samples/kprobes/jprobe_example.c
@@ -1,13 +1,13 @@
/*
* Here's a sample kernel module showing the use of jprobes to dump
- * the arguments of do_fork().
+ * the arguments of _do_fork().
*
* For more information on theory of operation of jprobes, see
* Documentation/kprobes.txt
*
* Build and insert the kernel module as done in the kprobe example.
* You will see the trace data in /var/log/messages and on the
- * console whenever do_fork() is invoked to create a new process.
+ * console whenever _do_fork() is invoked to create a new process.
* (Some messages may be suppressed if syslogd is configured to
* eliminate duplicate messages.)
*/
@@ -17,13 +17,13 @@
#include <linux/kprobes.h>
/*
- * Jumper probe for do_fork.
+ * Jumper probe for _do_fork.
* Mirror principle enables access to arguments of the probed routine
* from the probe handler.
*/
-/* Proxy routine having the same arguments as actual do_fork() routine */
-static long jdo_fork(unsigned long clone_flags, unsigned long stack_start,
+/* Proxy routine having the same arguments as actual _do_fork() routine */
+static long j_do_fork(unsigned long clone_flags, unsigned long stack_start,
unsigned long stack_size, int __user *parent_tidptr,
int __user *child_tidptr)
{
@@ -36,9 +36,9 @@ static long jdo_fork(unsigned long clone_flags, unsigned long stack_start,
}
static struct jprobe my_jprobe = {
- .entry = jdo_fork,
+ .entry = j_do_fork,
.kp = {
- .symbol_name = "do_fork",
+ .symbol_name = "_do_fork",
},
};
diff --git a/samples/kprobes/kprobe_example.c b/samples/kprobes/kprobe_example.c
index 366db1a9fb65..727eb21c9c56 100644
--- a/samples/kprobes/kprobe_example.c
+++ b/samples/kprobes/kprobe_example.c
@@ -1,13 +1,13 @@
/*
* NOTE: This example is works on x86 and powerpc.
* Here's a sample kernel module showing the use of kprobes to dump a
- * stack trace and selected registers when do_fork() is called.
+ * stack trace and selected registers when _do_fork() is called.
*
* For more information on theory of operation of kprobes, see
* Documentation/kprobes.txt
*
* You will see the trace data in /var/log/messages and on the console
- * whenever do_fork() is invoked to create a new process.
+ * whenever _do_fork() is invoked to create a new process.
*/
#include <linux/kernel.h>
@@ -16,7 +16,7 @@
/* For each probe you need to allocate a kprobe structure */
static struct kprobe kp = {
- .symbol_name = "do_fork",
+ .symbol_name = "_do_fork",
};
/* kprobe pre_handler: called just before the probed instruction is executed */
diff --git a/samples/kprobes/kretprobe_example.c b/samples/kprobes/kretprobe_example.c
index 1041b6731598..ebb1d1aed547 100644
--- a/samples/kprobes/kretprobe_example.c
+++ b/samples/kprobes/kretprobe_example.c
@@ -7,7 +7,7 @@
*
* usage: insmod kretprobe_example.ko func=<func_name>
*
- * If no func_name is specified, do_fork is instrumented
+ * If no func_name is specified, _do_fork is instrumented
*
* For more information on theory of operation of kretprobes, see
* Documentation/kprobes.txt
@@ -25,7 +25,7 @@
#include <linux/limits.h>
#include <linux/sched.h>
-static char func_name[NAME_MAX] = "do_fork";
+static char func_name[NAME_MAX] = "_do_fork";
module_param_string(func, func_name, NAME_MAX, S_IRUGO);
MODULE_PARM_DESC(func, "Function to kretprobe; this module will report the"
" function's execution time");
diff --git a/samples/trace_events/trace-events-sample.h b/samples/trace_events/trace-events-sample.h
index 125d6402f64f..d6b75bb495b3 100644
--- a/samples/trace_events/trace-events-sample.h
+++ b/samples/trace_events/trace-events-sample.h
@@ -4,14 +4,14 @@
*
* The define_trace.h below will also look for a file name of
* TRACE_SYSTEM.h where TRACE_SYSTEM is what is defined here.
- * In this case, it would look for sample.h
+ * In this case, it would look for sample-trace.h
*
* If the header name will be different than the system name
* (as in this case), then you can override the header name that
* define_trace.h will look up by defining TRACE_INCLUDE_FILE
*
* This file is called trace-events-sample.h but we want the system
- * to be called "sample". Therefore we must define the name of this
+ * to be called "sample-trace". Therefore we must define the name of this
* file:
*
* #define TRACE_INCLUDE_FILE trace-events-sample
@@ -106,7 +106,7 @@
*
* memcpy(__entry->foo, bar, 10);
*
- * __dynamic_array: This is similar to array, but can vary is size from
+ * __dynamic_array: This is similar to array, but can vary its size from
* instance to instance of the tracepoint being called.
* Like __array, this too has three elements (type, name, size);
* type is the type of the element, name is the name of the array.
generated by cgit v1.2.3 (git 2.25.1) at 2024-05-21 14:49:19 +0000