diff mbox series

[bpf-next] selftests/bpf: verifier/prevent_map_lookup converted to inline assembly

Message ID 20230421204514.2450907-1-eddyz87@gmail.com (mailing list archive)
State Accepted
Commit 35150203e30b52d657165e325e3abc3b29c2086d
Delegated to: BPF
Headers show
Series [bpf-next] selftests/bpf: verifier/prevent_map_lookup converted to inline assembly | expand

Checks

Context Check Description
bpf/vmtest-bpf-next-PR success PR summary
netdev/series_format success Single patches do not need cover letters
netdev/tree_selection success Clearly marked for bpf-next, async
netdev/fixes_present success Fixes tag not required for -next series
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 18 this patch: 18
netdev/cc_maintainers warning 9 maintainers not CCed: mykolal@fb.com song@kernel.org shuah@kernel.org sdf@google.com haoluo@google.com john.fastabend@gmail.com kpsingh@kernel.org jolsa@kernel.org linux-kselftest@vger.kernel.org
netdev/build_clang success Errors and warnings before: 18 this patch: 18
netdev/verify_signedoff success Signed-off-by tag matches author and committer
netdev/deprecated_api success None detected
netdev/check_selftest success No net selftest shell script
netdev/verify_fixes success No Fixes tag
netdev/build_allmodconfig_warn success Errors and warnings before: 18 this patch: 18
netdev/checkpatch warning WARNING: 'becuase' may be misspelled - perhaps 'because'? WARNING: Avoid line continuations in quoted strings WARNING: added, moved or deleted file(s), does MAINTAINERS need updating? WARNING: line length of 83 exceeds 80 columns
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netdev/source_inline success Was 0 now: 0
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Commit Message

Eduard Zingerman April 21, 2023, 8:45 p.m. UTC 
Test verifier/prevent_map_lookup automatically converted to use inline assembly.

This was a part of a series [1] but could not be applied becuase
another patch from a series had to be witheld.

[1] https://lore.kernel.org/bpf/20230421174234.2391278-1-eddyz87@gmail.com/

Signed-off-by: Eduard Zingerman <eddyz87@gmail.com>
---
 .../selftests/bpf/prog_tests/verifier.c       |  2 +
 .../bpf/progs/verifier_prevent_map_lookup.c   | 61 +++++++++++++++++++
 .../bpf/verifier/prevent_map_lookup.c         | 29 ---------
 3 files changed, 63 insertions(+), 29 deletions(-)
 create mode 100644 tools/testing/selftests/bpf/progs/verifier_prevent_map_lookup.c
 delete mode 100644 tools/testing/selftests/bpf/verifier/prevent_map_lookup.c

Comments

patchwork-bot+netdevbpf@kernel.org April 22, 2023, 3:40 p.m. UTC | #1 
Hello:

This patch was applied to bpf/bpf-next.git (master)
by Alexei Starovoitov <ast@kernel.org>:

On Fri, 21 Apr 2023 23:45:14 +0300 you wrote:
> Test verifier/prevent_map_lookup automatically converted to use inline assembly.
> 
> This was a part of a series [1] but could not be applied becuase
> another patch from a series had to be witheld.
> 
> [1] https://lore.kernel.org/bpf/20230421174234.2391278-1-eddyz87@gmail.com/
> 
> [...]

Here is the summary with links:
  - [bpf-next] selftests/bpf: verifier/prevent_map_lookup converted to inline assembly
    https://git.kernel.org/bpf/bpf-next/c/35150203e30b

You are awesome, thank you!
diff mbox series

Patch

diff --git a/tools/testing/selftests/bpf/prog_tests/verifier.c b/tools/testing/selftests/bpf/prog_tests/verifier.c
index c8bab8b1a6a4..2497716ee379 100644
--- a/tools/testing/selftests/bpf/prog_tests/verifier.c
+++ b/tools/testing/selftests/bpf/prog_tests/verifier.c
@@ -42,6 +42,7 @@ 
 #include "verifier_meta_access.skel.h"
 #include "verifier_netfilter_ctx.skel.h"
 #include "verifier_netfilter_retcode.skel.h"
+#include "verifier_prevent_map_lookup.skel.h"
 #include "verifier_raw_stack.skel.h"
 #include "verifier_raw_tp_writable.skel.h"
 #include "verifier_reg_equal.skel.h"
@@ -140,6 +141,7 @@  void test_verifier_masking(void)              { RUN(verifier_masking); }
 void test_verifier_meta_access(void)          { RUN(verifier_meta_access); }
 void test_verifier_netfilter_ctx(void)        { RUN(verifier_netfilter_ctx); }
 void test_verifier_netfilter_retcode(void)    { RUN(verifier_netfilter_retcode); }
+void test_verifier_prevent_map_lookup(void)   { RUN(verifier_prevent_map_lookup); }
 void test_verifier_raw_stack(void)            { RUN(verifier_raw_stack); }
 void test_verifier_raw_tp_writable(void)      { RUN(verifier_raw_tp_writable); }
 void test_verifier_reg_equal(void)            { RUN(verifier_reg_equal); }
diff --git a/tools/testing/selftests/bpf/progs/verifier_prevent_map_lookup.c b/tools/testing/selftests/bpf/progs/verifier_prevent_map_lookup.c
new file mode 100644
index 000000000000..8d27c780996f
--- /dev/null
+++ b/tools/testing/selftests/bpf/progs/verifier_prevent_map_lookup.c
@@ -0,0 +1,61 @@ 
+// SPDX-License-Identifier: GPL-2.0
+/* Converted from tools/testing/selftests/bpf/verifier/prevent_map_lookup.c */
+
+#include <linux/bpf.h>
+#include <bpf/bpf_helpers.h>
+#include "bpf_misc.h"
+
+struct {
+	__uint(type, BPF_MAP_TYPE_STACK_TRACE);
+	__uint(max_entries, 1);
+	__type(key, __u32);
+	__type(value, __u64);
+} map_stacktrace SEC(".maps");
+
+struct {
+	__uint(type, BPF_MAP_TYPE_PROG_ARRAY);
+	__uint(max_entries, 8);
+	__uint(key_size, sizeof(int));
+	__array(values, void (void));
+} map_prog2_socket SEC(".maps");
+
+SEC("perf_event")
+__description("prevent map lookup in stack trace")
+__failure __msg("cannot pass map_type 7 into func bpf_map_lookup_elem")
+__naked void map_lookup_in_stack_trace(void)
+{
+	asm volatile ("					\
+	r1 = 0;						\
+	*(u64*)(r10 - 8) = r1;				\
+	r2 = r10;					\
+	r2 += -8;					\
+	r1 = %[map_stacktrace] ll;			\
+	call %[bpf_map_lookup_elem];			\
+	exit;						\
+"	:
+	: __imm(bpf_map_lookup_elem),
+	  __imm_addr(map_stacktrace)
+	: __clobber_all);
+}
+
+SEC("socket")
+__description("prevent map lookup in prog array")
+__failure __msg("cannot pass map_type 3 into func bpf_map_lookup_elem")
+__failure_unpriv
+__naked void map_lookup_in_prog_array(void)
+{
+	asm volatile ("					\
+	r1 = 0;						\
+	*(u64*)(r10 - 8) = r1;				\
+	r2 = r10;					\
+	r2 += -8;					\
+	r1 = %[map_prog2_socket] ll;			\
+	call %[bpf_map_lookup_elem];			\
+	exit;						\
+"	:
+	: __imm(bpf_map_lookup_elem),
+	  __imm_addr(map_prog2_socket)
+	: __clobber_all);
+}
+
+char _license[] SEC("license") = "GPL";
diff --git a/tools/testing/selftests/bpf/verifier/prevent_map_lookup.c b/tools/testing/selftests/bpf/verifier/prevent_map_lookup.c
deleted file mode 100644
index fc4e301260f6..000000000000
--- a/tools/testing/selftests/bpf/verifier/prevent_map_lookup.c
+++ /dev/null
@@ -1,29 +0,0 @@ 
-{
-	"prevent map lookup in stack trace",
-	.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_EXIT_INSN(),
-	},
-	.fixup_map_stacktrace = { 3 },
-	.result = REJECT,
-	.errstr = "cannot pass map_type 7 into func bpf_map_lookup_elem",
-	.prog_type = BPF_PROG_TYPE_PERF_EVENT,
-},
-{
-	"prevent map lookup in prog array",
-	.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_EXIT_INSN(),
-	},
-	.fixup_prog2 = { 3 },
-	.result = REJECT,
-	.errstr = "cannot pass map_type 3 into func bpf_map_lookup_elem",
-},