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authorIlya Leoshkevich <iii@linux.ibm.com>2020-07-20 13:48:06 +0200
committerAlexei Starovoitov <ast@kernel.org>2020-07-21 13:26:26 -0700
commite4d9c2320716ea0e9ef59f503ddd8f253a642ddd (patch)
tree6f0b5d742197e5600edb95fb3a7fc16f1b4c4335 /samples
parent6bd557275ad5a1adaff5082f4e24218ba344e0c0 (diff)
downloadlinux-e4d9c2320716ea0e9ef59f503ddd8f253a642ddd.tar.bz2
samples/bpf, selftests/bpf: Use bpf_probe_read_kernel
A handful of samples and selftests fail to build on s390, because after commit 0ebeea8ca8a4 ("bpf: Restrict bpf_probe_read{, str}() only to archs where they work") bpf_probe_read is not available anymore. Fix by using bpf_probe_read_kernel. Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Link: https://lore.kernel.org/bpf/20200720114806.88823-1-iii@linux.ibm.com
Diffstat (limited to 'samples')
-rw-r--r--samples/bpf/offwaketime_kern.c7
-rw-r--r--samples/bpf/test_overhead_kprobe_kern.c12
-rw-r--r--samples/bpf/tracex1_kern.c9
-rw-r--r--samples/bpf/tracex5_kern.c4
4 files changed, 24 insertions, 8 deletions
diff --git a/samples/bpf/offwaketime_kern.c b/samples/bpf/offwaketime_kern.c
index d459f73412a4..e74ee1cd4b9c 100644
--- a/samples/bpf/offwaketime_kern.c
+++ b/samples/bpf/offwaketime_kern.c
@@ -12,7 +12,12 @@
#include <bpf/bpf_helpers.h>
#include <bpf/bpf_tracing.h>
-#define _(P) ({typeof(P) val; bpf_probe_read(&val, sizeof(val), &P); val;})
+#define _(P) \
+ ({ \
+ typeof(P) val; \
+ bpf_probe_read_kernel(&val, sizeof(val), &(P)); \
+ val; \
+ })
#define MINBLOCK_US 1
diff --git a/samples/bpf/test_overhead_kprobe_kern.c b/samples/bpf/test_overhead_kprobe_kern.c
index 8b811c29dc79..f6d593e47037 100644
--- a/samples/bpf/test_overhead_kprobe_kern.c
+++ b/samples/bpf/test_overhead_kprobe_kern.c
@@ -10,7 +10,12 @@
#include <bpf/bpf_helpers.h>
#include <bpf/bpf_tracing.h>
-#define _(P) ({typeof(P) val = 0; bpf_probe_read(&val, sizeof(val), &P); val;})
+#define _(P) \
+ ({ \
+ typeof(P) val = 0; \
+ bpf_probe_read_kernel(&val, sizeof(val), &(P)); \
+ val; \
+ })
SEC("kprobe/__set_task_comm")
int prog(struct pt_regs *ctx)
@@ -25,8 +30,9 @@ int prog(struct pt_regs *ctx)
tsk = (void *)PT_REGS_PARM1(ctx);
pid = _(tsk->pid);
- bpf_probe_read(oldcomm, sizeof(oldcomm), &tsk->comm);
- bpf_probe_read(newcomm, sizeof(newcomm), (void *)PT_REGS_PARM2(ctx));
+ bpf_probe_read_kernel(oldcomm, sizeof(oldcomm), &tsk->comm);
+ bpf_probe_read_kernel(newcomm, sizeof(newcomm),
+ (void *)PT_REGS_PARM2(ctx));
signal = _(tsk->signal);
oom_score_adj = _(signal->oom_score_adj);
return 0;
diff --git a/samples/bpf/tracex1_kern.c b/samples/bpf/tracex1_kern.c
index 8e2610e14475..3f4599c9a202 100644
--- a/samples/bpf/tracex1_kern.c
+++ b/samples/bpf/tracex1_kern.c
@@ -11,7 +11,12 @@
#include <bpf/bpf_helpers.h>
#include <bpf/bpf_tracing.h>
-#define _(P) ({typeof(P) val = 0; bpf_probe_read(&val, sizeof(val), &P); val;})
+#define _(P) \
+ ({ \
+ typeof(P) val = 0; \
+ bpf_probe_read_kernel(&val, sizeof(val), &(P)); \
+ val; \
+ })
/* kprobe is NOT a stable ABI
* kernel functions can be removed, renamed or completely change semantics.
@@ -34,7 +39,7 @@ int bpf_prog1(struct pt_regs *ctx)
dev = _(skb->dev);
len = _(skb->len);
- bpf_probe_read(devname, sizeof(devname), dev->name);
+ bpf_probe_read_kernel(devname, sizeof(devname), dev->name);
if (devname[0] == 'l' && devname[1] == 'o') {
char fmt[] = "skb %p len %d\n";
diff --git a/samples/bpf/tracex5_kern.c b/samples/bpf/tracex5_kern.c
index 32b49e8ab6bd..64a1f7550d7e 100644
--- a/samples/bpf/tracex5_kern.c
+++ b/samples/bpf/tracex5_kern.c
@@ -47,7 +47,7 @@ PROG(SYS__NR_write)(struct pt_regs *ctx)
{
struct seccomp_data sd;
- bpf_probe_read(&sd, sizeof(sd), (void *)PT_REGS_PARM2(ctx));
+ bpf_probe_read_kernel(&sd, sizeof(sd), (void *)PT_REGS_PARM2(ctx));
if (sd.args[2] == 512) {
char fmt[] = "write(fd=%d, buf=%p, size=%d)\n";
bpf_trace_printk(fmt, sizeof(fmt),
@@ -60,7 +60,7 @@ PROG(SYS__NR_read)(struct pt_regs *ctx)
{
struct seccomp_data sd;
- bpf_probe_read(&sd, sizeof(sd), (void *)PT_REGS_PARM2(ctx));
+ bpf_probe_read_kernel(&sd, sizeof(sd), (void *)PT_REGS_PARM2(ctx));
if (sd.args[2] > 128 && sd.args[2] <= 1024) {
char fmt[] = "read(fd=%d, buf=%p, size=%d)\n";
bpf_trace_printk(fmt, sizeof(fmt),