From: Stanislav Fomichev <sdf@google.com>
Date: Thu, 11 May 2023 10:04:55 -0700
Subject: selftests/bpf: Correctly handle optlen > 4096
Patch-mainline: v6.5-rc1
Git-commit: e01b4a72f132c1ca63e3ed851bef9b3c62ae6149
References: jsc#PED-6811
Even though it's not relevant in selftests, the people
might still copy-paste from them. So let's take care
of optlen > 4096 cases explicitly.
Signed-off-by: Stanislav Fomichev <sdf@google.com>
Link: https://lore.kernel.org/r/20230511170456.1759459-4-sdf@google.com
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
Acked-by: Shung-Hsi Yu <shung-hsi.yu@suse.com>
---
tools/testing/selftests/bpf/prog_tests/cgroup_getset_retval.c | 20 +
tools/testing/selftests/bpf/prog_tests/sockopt_inherit.c | 59 +----
tools/testing/selftests/bpf/prog_tests/sockopt_multi.c | 108 ++--------
tools/testing/selftests/bpf/prog_tests/sockopt_qos_to_cc.c | 2
tools/testing/selftests/bpf/progs/cgroup_getset_retval_getsockopt.c | 13 +
tools/testing/selftests/bpf/progs/cgroup_getset_retval_setsockopt.c | 17 +
tools/testing/selftests/bpf/progs/sockopt_inherit.c | 18 +
tools/testing/selftests/bpf/progs/sockopt_multi.c | 26 ++
tools/testing/selftests/bpf/progs/sockopt_qos_to_cc.c | 10
tools/testing/selftests/bpf/progs/sockopt_sk.c | 25 +-
10 files changed, 166 insertions(+), 132 deletions(-)
--- a/tools/testing/selftests/bpf/prog_tests/cgroup_getset_retval.c
+++ b/tools/testing/selftests/bpf/prog_tests/cgroup_getset_retval.c
@@ -25,6 +25,8 @@ static void test_setsockopt_set(int cgro
if (!ASSERT_OK_PTR(obj, "skel-load"))
return;
+ obj->bss->page_size = sysconf(_SC_PAGESIZE);
+
/* Attach setsockopt that sets EUNATCH, assert that
* we actually get that error when we run setsockopt()
*/
@@ -59,6 +61,8 @@ static void test_setsockopt_set_and_get(
if (!ASSERT_OK_PTR(obj, "skel-load"))
return;
+ obj->bss->page_size = sysconf(_SC_PAGESIZE);
+
/* Attach setsockopt that sets EUNATCH, and one that gets the
* previously set errno. Assert that we get the same errno back.
*/
@@ -100,6 +104,8 @@ static void test_setsockopt_default_zero
if (!ASSERT_OK_PTR(obj, "skel-load"))
return;
+ obj->bss->page_size = sysconf(_SC_PAGESIZE);
+
/* Attach setsockopt that gets the previously set errno.
* Assert that, without anything setting one, we get 0.
*/
@@ -134,6 +140,8 @@ static void test_setsockopt_default_zero
if (!ASSERT_OK_PTR(obj, "skel-load"))
return;
+ obj->bss->page_size = sysconf(_SC_PAGESIZE);
+
/* Attach setsockopt that gets the previously set errno, and then
* one that sets the errno to EUNATCH. Assert that the get does not
* see EUNATCH set later, and does not prevent EUNATCH from being set.
@@ -177,6 +185,8 @@ static void test_setsockopt_override(int
if (!ASSERT_OK_PTR(obj, "skel-load"))
return;
+ obj->bss->page_size = sysconf(_SC_PAGESIZE);
+
/* Attach setsockopt that sets EUNATCH, then one that sets EISCONN,
* and then one that gets the exported errno. Assert both the syscall
* and the helper sees the last set errno.
@@ -224,6 +234,8 @@ static void test_setsockopt_legacy_eperm
if (!ASSERT_OK_PTR(obj, "skel-load"))
return;
+ obj->bss->page_size = sysconf(_SC_PAGESIZE);
+
/* Attach setsockopt that return a reject without setting errno
* (legacy reject), and one that gets the errno. Assert that for
* backward compatibility the syscall result in EPERM, and this
@@ -268,6 +280,8 @@ static void test_setsockopt_legacy_no_ov
if (!ASSERT_OK_PTR(obj, "skel-load"))
return;
+ obj->bss->page_size = sysconf(_SC_PAGESIZE);
+
/* Attach setsockopt that sets EUNATCH, then one that return a reject
* without setting errno, and then one that gets the exported errno.
* Assert both the syscall and the helper's errno are unaffected by
@@ -319,6 +333,8 @@ static void test_getsockopt_get(int cgro
if (!ASSERT_OK_PTR(obj, "skel-load"))
return;
+ obj->bss->page_size = sysconf(_SC_PAGESIZE);
+
/* Attach getsockopt that gets previously set errno. Assert that the
* error from kernel is in both ctx_retval_value and retval_value.
*/
@@ -359,6 +375,8 @@ static void test_getsockopt_override(int
if (!ASSERT_OK_PTR(obj, "skel-load"))
return;
+ obj->bss->page_size = sysconf(_SC_PAGESIZE);
+
/* Attach getsockopt that sets retval to -EISCONN. Assert that this
* overrides the value from kernel.
*/
@@ -396,6 +414,8 @@ static void test_getsockopt_retval_sync(
if (!ASSERT_OK_PTR(obj, "skel-load"))
return;
+ obj->bss->page_size = sysconf(_SC_PAGESIZE);
+
/* Attach getsockopt that sets retval to -EISCONN, and one that clears
* ctx retval. Assert that the clearing ctx retval is synced to helper
* and clears any errors both from kernel and BPF..
--- a/tools/testing/selftests/bpf/prog_tests/sockopt_inherit.c
+++ b/tools/testing/selftests/bpf/prog_tests/sockopt_inherit.c
@@ -2,6 +2,8 @@
#include <test_progs.h>
#include "cgroup_helpers.h"
+#include "sockopt_inherit.skel.h"
+
#define SOL_CUSTOM 0xdeadbeef
#define CUSTOM_INHERIT1 0
#define CUSTOM_INHERIT2 1
@@ -132,58 +134,30 @@ static int start_server(void)
return fd;
}
-static int prog_attach(struct bpf_object *obj, int cgroup_fd, const char *title,
- const char *prog_name)
-{
- enum bpf_attach_type attach_type;
- enum bpf_prog_type prog_type;
- struct bpf_program *prog;
- int err;
-
- err = libbpf_prog_type_by_name(title, &prog_type, &attach_type);
- if (err) {
- log_err("Failed to deduct types for %s BPF program", prog_name);
- return -1;
- }
-
- prog = bpf_object__find_program_by_name(obj, prog_name);
- if (!prog) {
- log_err("Failed to find %s BPF program", prog_name);
- return -1;
- }
-
- err = bpf_prog_attach(bpf_program__fd(prog), cgroup_fd,
- attach_type, 0);
- if (err) {
- log_err("Failed to attach %s BPF program", prog_name);
- return -1;
- }
-
- return 0;
-}
-
static void run_test(int cgroup_fd)
{
+ struct bpf_link *link_getsockopt = NULL;
+ struct bpf_link *link_setsockopt = NULL;
int server_fd = -1, client_fd;
- struct bpf_object *obj;
+ struct sockopt_inherit *obj;
void *server_err;
pthread_t tid;
int err;
- obj = bpf_object__open_file("sockopt_inherit.bpf.o", NULL);
- if (!ASSERT_OK_PTR(obj, "obj_open"))
+ obj = sockopt_inherit__open_and_load();
+ if (!ASSERT_OK_PTR(obj, "skel-load"))
return;
- err = bpf_object__load(obj);
- if (!ASSERT_OK(err, "obj_load"))
- goto close_bpf_object;
+ obj->bss->page_size = sysconf(_SC_PAGESIZE);
- err = prog_attach(obj, cgroup_fd, "cgroup/getsockopt", "_getsockopt");
- if (!ASSERT_OK(err, "prog_attach _getsockopt"))
+ link_getsockopt = bpf_program__attach_cgroup(obj->progs._getsockopt,
+ cgroup_fd);
+ if (!ASSERT_OK_PTR(link_getsockopt, "cg-attach-getsockopt"))
goto close_bpf_object;
- err = prog_attach(obj, cgroup_fd, "cgroup/setsockopt", "_setsockopt");
- if (!ASSERT_OK(err, "prog_attach _setsockopt"))
+ link_setsockopt = bpf_program__attach_cgroup(obj->progs._setsockopt,
+ cgroup_fd);
+ if (!ASSERT_OK_PTR(link_setsockopt, "cg-attach-setsockopt"))
goto close_bpf_object;
server_fd = start_server();
@@ -217,7 +191,10 @@ static void run_test(int cgroup_fd)
close_server_fd:
close(server_fd);
close_bpf_object:
- bpf_object__close(obj);
+ bpf_link__destroy(link_getsockopt);
+ bpf_link__destroy(link_setsockopt);
+
+ sockopt_inherit__destroy(obj);
}
void test_sockopt_inherit(void)
--- a/tools/testing/selftests/bpf/prog_tests/sockopt_multi.c
+++ b/tools/testing/selftests/bpf/prog_tests/sockopt_multi.c
@@ -2,61 +2,13 @@
#include <test_progs.h>
#include "cgroup_helpers.h"
-static int prog_attach(struct bpf_object *obj, int cgroup_fd, const char *title, const char *name)
-{
- enum bpf_attach_type attach_type;
- enum bpf_prog_type prog_type;
- struct bpf_program *prog;
- int err;
-
- err = libbpf_prog_type_by_name(title, &prog_type, &attach_type);
- if (err) {
- log_err("Failed to deduct types for %s BPF program", title);
- return -1;
- }
-
- prog = bpf_object__find_program_by_name(obj, name);
- if (!prog) {
- log_err("Failed to find %s BPF program", name);
- return -1;
- }
-
- err = bpf_prog_attach(bpf_program__fd(prog), cgroup_fd,
- attach_type, BPF_F_ALLOW_MULTI);
- if (err) {
- log_err("Failed to attach %s BPF program", name);
- return -1;
- }
-
- return 0;
-}
-
-static int prog_detach(struct bpf_object *obj, int cgroup_fd, const char *title, const char *name)
-{
- enum bpf_attach_type attach_type;
- enum bpf_prog_type prog_type;
- struct bpf_program *prog;
- int err;
-
- err = libbpf_prog_type_by_name(title, &prog_type, &attach_type);
- if (err)
- return -1;
-
- prog = bpf_object__find_program_by_name(obj, name);
- if (!prog)
- return -1;
-
- err = bpf_prog_detach2(bpf_program__fd(prog), cgroup_fd,
- attach_type);
- if (err)
- return -1;
+#include "sockopt_multi.skel.h"
- return 0;
-}
-
-static int run_getsockopt_test(struct bpf_object *obj, int cg_parent,
+static int run_getsockopt_test(struct sockopt_multi *obj, int cg_parent,
int cg_child, int sock_fd)
{
+ struct bpf_link *link_parent = NULL;
+ struct bpf_link *link_child = NULL;
socklen_t optlen;
__u8 buf;
int err;
@@ -89,8 +41,9 @@ static int run_getsockopt_test(struct bp
* - child: 0x80 -> 0x90
*/
- err = prog_attach(obj, cg_child, "cgroup/getsockopt", "_getsockopt_child");
- if (err)
+ link_child = bpf_program__attach_cgroup(obj->progs._getsockopt_child,
+ cg_child);
+ if (!ASSERT_OK_PTR(link_child, "cg-attach-getsockopt_child"))
goto detach;
buf = 0x00;
@@ -113,8 +66,9 @@ static int run_getsockopt_test(struct bp
* - parent: 0x90 -> 0xA0
*/
- err = prog_attach(obj, cg_parent, "cgroup/getsockopt", "_getsockopt_parent");
- if (err)
+ link_parent = bpf_program__attach_cgroup(obj->progs._getsockopt_parent,
+ cg_parent);
+ if (!ASSERT_OK_PTR(link_parent, "cg-attach-getsockopt_parent"))
goto detach;
buf = 0x00;
@@ -157,11 +111,8 @@ static int run_getsockopt_test(struct bp
* - parent: unexpected 0x40, EPERM
*/
- err = prog_detach(obj, cg_child, "cgroup/getsockopt", "_getsockopt_child");
- if (err) {
- log_err("Failed to detach child program");
- goto detach;
- }
+ bpf_link__destroy(link_child);
+ link_child = NULL;
buf = 0x00;
optlen = 1;
@@ -198,15 +149,17 @@ static int run_getsockopt_test(struct bp
}
detach:
- prog_detach(obj, cg_child, "cgroup/getsockopt", "_getsockopt_child");
- prog_detach(obj, cg_parent, "cgroup/getsockopt", "_getsockopt_parent");
+ bpf_link__destroy(link_child);
+ bpf_link__destroy(link_parent);
return err;
}
-static int run_setsockopt_test(struct bpf_object *obj, int cg_parent,
+static int run_setsockopt_test(struct sockopt_multi *obj, int cg_parent,
int cg_child, int sock_fd)
{
+ struct bpf_link *link_parent = NULL;
+ struct bpf_link *link_child = NULL;
socklen_t optlen;
__u8 buf;
int err;
@@ -236,8 +189,9 @@ static int run_setsockopt_test(struct bp
/* Attach child program and make sure it adds 0x10. */
- err = prog_attach(obj, cg_child, "cgroup/setsockopt", "_setsockopt");
- if (err)
+ link_child = bpf_program__attach_cgroup(obj->progs._setsockopt,
+ cg_child);
+ if (!ASSERT_OK_PTR(link_child, "cg-attach-setsockopt_child"))
goto detach;
buf = 0x80;
@@ -263,8 +217,9 @@ static int run_setsockopt_test(struct bp
/* Attach parent program and make sure it adds another 0x10. */
- err = prog_attach(obj, cg_parent, "cgroup/setsockopt", "_setsockopt");
- if (err)
+ link_parent = bpf_program__attach_cgroup(obj->progs._setsockopt,
+ cg_parent);
+ if (!ASSERT_OK_PTR(link_parent, "cg-attach-setsockopt_parent"))
goto detach;
buf = 0x80;
@@ -289,8 +244,8 @@ static int run_setsockopt_test(struct bp
}
detach:
- prog_detach(obj, cg_child, "cgroup/setsockopt", "_setsockopt");
- prog_detach(obj, cg_parent, "cgroup/setsockopt", "_setsockopt");
+ bpf_link__destroy(link_child);
+ bpf_link__destroy(link_parent);
return err;
}
@@ -298,9 +253,8 @@ detach:
void test_sockopt_multi(void)
{
int cg_parent = -1, cg_child = -1;
- struct bpf_object *obj = NULL;
+ struct sockopt_multi *obj = NULL;
int sock_fd = -1;
- int err = -1;
cg_parent = test__join_cgroup("/parent");
if (!ASSERT_GE(cg_parent, 0, "join_cgroup /parent"))
@@ -310,13 +264,11 @@ void test_sockopt_multi(void)
if (!ASSERT_GE(cg_child, 0, "join_cgroup /parent/child"))
goto out;
- obj = bpf_object__open_file("sockopt_multi.bpf.o", NULL);
- if (!ASSERT_OK_PTR(obj, "obj_load"))
+ obj = sockopt_multi__open_and_load();
+ if (!ASSERT_OK_PTR(obj, "skel-load"))
goto out;
- err = bpf_object__load(obj);
- if (!ASSERT_OK(err, "obj_load"))
- goto out;
+ obj->bss->page_size = sysconf(_SC_PAGESIZE);
sock_fd = socket(AF_INET, SOCK_STREAM, 0);
if (!ASSERT_GE(sock_fd, 0, "socket"))
@@ -327,7 +279,7 @@ void test_sockopt_multi(void)
out:
close(sock_fd);
- bpf_object__close(obj);
+ sockopt_multi__destroy(obj);
close(cg_child);
close(cg_parent);
}
--- a/tools/testing/selftests/bpf/prog_tests/sockopt_qos_to_cc.c
+++ b/tools/testing/selftests/bpf/prog_tests/sockopt_qos_to_cc.c
@@ -42,6 +42,8 @@ void test_sockopt_qos_to_cc(void)
if (!ASSERT_OK_PTR(skel, "skel"))
goto done;
+ skel->bss->page_size = sysconf(_SC_PAGESIZE);
+
sock_fd = socket(AF_INET6, SOCK_STREAM, 0);
if (!ASSERT_GE(sock_fd, 0, "v6 socket open"))
goto done;
--- a/tools/testing/selftests/bpf/progs/cgroup_getset_retval_getsockopt.c
+++ b/tools/testing/selftests/bpf/progs/cgroup_getset_retval_getsockopt.c
@@ -12,6 +12,7 @@ __u32 invocations = 0;
__u32 assertion_error = 0;
__u32 retval_value = 0;
__u32 ctx_retval_value = 0;
+__u32 page_size = 0;
SEC("cgroup/getsockopt")
int get_retval(struct bpf_sockopt *ctx)
@@ -20,6 +21,10 @@ int get_retval(struct bpf_sockopt *ctx)
ctx_retval_value = ctx->retval;
__sync_fetch_and_add(&invocations, 1);
+ /* optval larger than PAGE_SIZE use kernel's buffer. */
+ if (ctx->optlen > page_size)
+ ctx->optlen = 0;
+
return 1;
}
@@ -31,6 +36,10 @@ int set_eisconn(struct bpf_sockopt *ctx)
if (bpf_set_retval(-EISCONN))
assertion_error = 1;
+ /* optval larger than PAGE_SIZE use kernel's buffer. */
+ if (ctx->optlen > page_size)
+ ctx->optlen = 0;
+
return 1;
}
@@ -41,5 +50,9 @@ int clear_retval(struct bpf_sockopt *ctx
ctx->retval = 0;
+ /* optval larger than PAGE_SIZE use kernel's buffer. */
+ if (ctx->optlen > page_size)
+ ctx->optlen = 0;
+
return 1;
}
--- a/tools/testing/selftests/bpf/progs/cgroup_getset_retval_setsockopt.c
+++ b/tools/testing/selftests/bpf/progs/cgroup_getset_retval_setsockopt.c
@@ -11,6 +11,7 @@
__u32 invocations = 0;
__u32 assertion_error = 0;
__u32 retval_value = 0;
+__u32 page_size = 0;
SEC("cgroup/setsockopt")
int get_retval(struct bpf_sockopt *ctx)
@@ -18,6 +19,10 @@ int get_retval(struct bpf_sockopt *ctx)
retval_value = bpf_get_retval();
__sync_fetch_and_add(&invocations, 1);
+ /* optval larger than PAGE_SIZE use kernel's buffer. */
+ if (ctx->optlen > page_size)
+ ctx->optlen = 0;
+
return 1;
}
@@ -29,6 +34,10 @@ int set_eunatch(struct bpf_sockopt *ctx)
if (bpf_set_retval(-EUNATCH))
assertion_error = 1;
+ /* optval larger than PAGE_SIZE use kernel's buffer. */
+ if (ctx->optlen > page_size)
+ ctx->optlen = 0;
+
return 0;
}
@@ -40,6 +49,10 @@ int set_eisconn(struct bpf_sockopt *ctx)
if (bpf_set_retval(-EISCONN))
assertion_error = 1;
+ /* optval larger than PAGE_SIZE use kernel's buffer. */
+ if (ctx->optlen > page_size)
+ ctx->optlen = 0;
+
return 0;
}
@@ -48,5 +61,9 @@ int legacy_eperm(struct bpf_sockopt *ctx
{
__sync_fetch_and_add(&invocations, 1);
+ /* optval larger than PAGE_SIZE use kernel's buffer. */
+ if (ctx->optlen > page_size)
+ ctx->optlen = 0;
+
return 0;
}
--- a/tools/testing/selftests/bpf/progs/sockopt_inherit.c
+++ b/tools/testing/selftests/bpf/progs/sockopt_inherit.c
@@ -9,6 +9,8 @@ char _license[] SEC("license") = "GPL";
#define CUSTOM_INHERIT2 1
#define CUSTOM_LISTENER 2
+__u32 page_size = 0;
+
struct sockopt_inherit {
__u8 val;
};
@@ -55,7 +57,7 @@ int _getsockopt(struct bpf_sockopt *ctx)
__u8 *optval = ctx->optval;
if (ctx->level != SOL_CUSTOM)
- return 1; /* only interested in SOL_CUSTOM */
+ goto out; /* only interested in SOL_CUSTOM */
if (optval + 1 > optval_end)
return 0; /* EPERM, bounds check */
@@ -70,6 +72,12 @@ int _getsockopt(struct bpf_sockopt *ctx)
ctx->optlen = 1;
return 1;
+
+out:
+ /* optval larger than PAGE_SIZE use kernel's buffer. */
+ if (ctx->optlen > page_size)
+ ctx->optlen = 0;
+ return 1;
}
SEC("cgroup/setsockopt")
@@ -80,7 +88,7 @@ int _setsockopt(struct bpf_sockopt *ctx)
__u8 *optval = ctx->optval;
if (ctx->level != SOL_CUSTOM)
- return 1; /* only interested in SOL_CUSTOM */
+ goto out; /* only interested in SOL_CUSTOM */
if (optval + 1 > optval_end)
return 0; /* EPERM, bounds check */
@@ -93,4 +101,10 @@ int _setsockopt(struct bpf_sockopt *ctx)
ctx->optlen = -1;
return 1;
+
+out:
+ /* optval larger than PAGE_SIZE use kernel's buffer. */
+ if (ctx->optlen > page_size)
+ ctx->optlen = 0;
+ return 1;
}
--- a/tools/testing/selftests/bpf/progs/sockopt_multi.c
+++ b/tools/testing/selftests/bpf/progs/sockopt_multi.c
@@ -5,6 +5,8 @@
char _license[] SEC("license") = "GPL";
+__u32 page_size = 0;
+
SEC("cgroup/getsockopt")
int _getsockopt_child(struct bpf_sockopt *ctx)
{
@@ -12,7 +14,7 @@ int _getsockopt_child(struct bpf_sockopt
__u8 *optval = ctx->optval;
if (ctx->level != SOL_IP || ctx->optname != IP_TOS)
- return 1;
+ goto out;
if (optval + 1 > optval_end)
return 0; /* EPERM, bounds check */
@@ -26,6 +28,12 @@ int _getsockopt_child(struct bpf_sockopt
ctx->optlen = 1;
return 1;
+
+out:
+ /* optval larger than PAGE_SIZE use kernel's buffer. */
+ if (ctx->optlen > page_size)
+ ctx->optlen = 0;
+ return 1;
}
SEC("cgroup/getsockopt")
@@ -35,7 +43,7 @@ int _getsockopt_parent(struct bpf_sockop
__u8 *optval = ctx->optval;
if (ctx->level != SOL_IP || ctx->optname != IP_TOS)
- return 1;
+ goto out;
if (optval + 1 > optval_end)
return 0; /* EPERM, bounds check */
@@ -49,6 +57,12 @@ int _getsockopt_parent(struct bpf_sockop
ctx->optlen = 1;
return 1;
+
+out:
+ /* optval larger than PAGE_SIZE use kernel's buffer. */
+ if (ctx->optlen > page_size)
+ ctx->optlen = 0;
+ return 1;
}
SEC("cgroup/setsockopt")
@@ -58,7 +72,7 @@ int _setsockopt(struct bpf_sockopt *ctx)
__u8 *optval = ctx->optval;
if (ctx->level != SOL_IP || ctx->optname != IP_TOS)
- return 1;
+ goto out;
if (optval + 1 > optval_end)
return 0; /* EPERM, bounds check */
@@ -67,4 +81,10 @@ int _setsockopt(struct bpf_sockopt *ctx)
ctx->optlen = 1;
return 1;
+
+out:
+ /* optval larger than PAGE_SIZE use kernel's buffer. */
+ if (ctx->optlen > page_size)
+ ctx->optlen = 0;
+ return 1;
}
--- a/tools/testing/selftests/bpf/progs/sockopt_qos_to_cc.c
+++ b/tools/testing/selftests/bpf/progs/sockopt_qos_to_cc.c
@@ -9,6 +9,8 @@
char _license[] SEC("license") = "GPL";
+__u32 page_size = 0;
+
SEC("cgroup/setsockopt")
int sockopt_qos_to_cc(struct bpf_sockopt *ctx)
{
@@ -19,7 +21,7 @@ int sockopt_qos_to_cc(struct bpf_sockopt
char cc_cubic[TCP_CA_NAME_MAX] = "cubic";
if (ctx->level != SOL_IPV6 || ctx->optname != IPV6_TCLASS)
- return 1;
+ goto out;
if (optval + 1 > optval_end)
return 0; /* EPERM, bounds check */
@@ -36,4 +38,10 @@ int sockopt_qos_to_cc(struct bpf_sockopt
return 0;
}
return 1;
+
+out:
+ /* optval larger than PAGE_SIZE use kernel's buffer. */
+ if (ctx->optlen > page_size)
+ ctx->optlen = 0;
+ return 1;
}
--- a/tools/testing/selftests/bpf/progs/sockopt_sk.c
+++ b/tools/testing/selftests/bpf/progs/sockopt_sk.c
@@ -37,7 +37,7 @@ int _getsockopt(struct bpf_sockopt *ctx)
/* Bypass AF_NETLINK. */
sk = ctx->sk;
if (sk && sk->family == AF_NETLINK)
- return 1;
+ goto out;
/* Make sure bpf_get_netns_cookie is callable.
*/
@@ -52,8 +52,7 @@ int _getsockopt(struct bpf_sockopt *ctx)
* let next BPF program in the cgroup chain or kernel
* handle it.
*/
- ctx->optlen = 0; /* bypass optval>PAGE_SIZE */
- return 1;
+ goto out;
}
if (ctx->level == SOL_SOCKET && ctx->optname == SO_SNDBUF) {
@@ -61,7 +60,7 @@ int _getsockopt(struct bpf_sockopt *ctx)
* let next BPF program in the cgroup chain or kernel
* handle it.
*/
- return 1;
+ goto out;
}
if (ctx->level == SOL_TCP && ctx->optname == TCP_CONGESTION) {
@@ -69,7 +68,7 @@ int _getsockopt(struct bpf_sockopt *ctx)
* let next BPF program in the cgroup chain or kernel
* handle it.
*/
- return 1;
+ goto out;
}
if (ctx->level == SOL_TCP && ctx->optname == TCP_ZEROCOPY_RECEIVE) {
@@ -85,7 +84,7 @@ int _getsockopt(struct bpf_sockopt *ctx)
if (((struct tcp_zerocopy_receive *)optval)->address != 0)
return 0; /* unexpected data */
- return 1;
+ goto out;
}
if (ctx->level == SOL_IP && ctx->optname == IP_FREEBIND) {
@@ -129,6 +128,12 @@ int _getsockopt(struct bpf_sockopt *ctx)
ctx->optlen = 1;
return 1;
+
+out:
+ /* optval larger than PAGE_SIZE use kernel's buffer. */
+ if (ctx->optlen > page_size)
+ ctx->optlen = 0;
+ return 1;
}
SEC("cgroup/setsockopt")
@@ -142,7 +147,7 @@ int _setsockopt(struct bpf_sockopt *ctx)
/* Bypass AF_NETLINK. */
sk = ctx->sk;
if (sk && sk->family == AF_NETLINK)
- return 1;
+ goto out;
/* Make sure bpf_get_netns_cookie is callable.
*/
@@ -224,4 +229,10 @@ int _setsockopt(struct bpf_sockopt *ctx)
*/
return 1;
+
+out:
+ /* optval larger than PAGE_SIZE use kernel's buffer. */
+ if (ctx->optlen > page_size)
+ ctx->optlen = 0;
+ return 1;
}