From c1046afc052fe61adf3ecd3aa57dd5a2a46eb287 Mon Sep 17 00:00:00 2001 From: Gilad Reti Date: Tue, 8 Mar 2022 22:06:30 +0800 Subject: [PATCH] selftests/bpf: Add verifier test for PTR_TO_MEM spill mainline inclusion from mainline-v5.11-rc5 commit 4237e9f4a96228ccc8a7abe5e4b30834323cd353 category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I4WT90 CVE: CVE-2021-4204 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=4237e9f4a96228ccc8a7abe5e4b30834323cd353 -------------------------------- Add a test to check that the verifier is able to recognize spilling of PTR_TO_MEM registers, by reserving a ringbuf buffer, forcing the spill of a pointer holding the buffer address to the stack, filling it back in from the stack and writing to the memory area pointed by it. The patch was partially contributed by CyberArk Software, Inc. Signed-off-by: Gilad Reti Signed-off-by: Alexei Starovoitov Acked-by: Yonghong Song Acked-by: KP Singh Link: https://lore.kernel.org/bpf/20210113053810.13518-2-gilad.reti@gmail.com Signed-off-by: Pu Lehui Reviewed-by: Kuohai Xu Signed-off-by: Zheng Zengkai --- tools/testing/selftests/bpf/test_verifier.c | 12 +++++++- .../selftests/bpf/verifier/spill_fill.c | 30 +++++++++++++++++++ 2 files changed, 41 insertions(+), 1 deletion(-) diff --git a/tools/testing/selftests/bpf/test_verifier.c b/tools/testing/selftests/bpf/test_verifier.c index a4c55fcb0e7b..0fc813235575 100644 --- a/tools/testing/selftests/bpf/test_verifier.c +++ b/tools/testing/selftests/bpf/test_verifier.c @@ -50,7 +50,7 @@ #define MAX_INSNS BPF_MAXINSNS #define MAX_TEST_INSNS 1000000 #define MAX_FIXUPS 8 -#define MAX_NR_MAPS 20 +#define MAX_NR_MAPS 21 #define MAX_TEST_RUNS 8 #define POINTER_VALUE 0xcafe4all #define TEST_DATA_LEN 64 @@ -87,6 +87,7 @@ struct bpf_test { int fixup_sk_storage_map[MAX_FIXUPS]; int fixup_map_event_output[MAX_FIXUPS]; int fixup_map_reuseport_array[MAX_FIXUPS]; + int fixup_map_ringbuf[MAX_FIXUPS]; const char *errstr; const char *errstr_unpriv; uint32_t insn_processed; @@ -640,6 +641,7 @@ static void do_test_fixup(struct bpf_test *test, enum bpf_prog_type prog_type, int *fixup_sk_storage_map = test->fixup_sk_storage_map; int *fixup_map_event_output = test->fixup_map_event_output; int *fixup_map_reuseport_array = test->fixup_map_reuseport_array; + int *fixup_map_ringbuf = test->fixup_map_ringbuf; if (test->fill_helper) { test->fill_insns = calloc(MAX_TEST_INSNS, sizeof(struct bpf_insn)); @@ -817,6 +819,14 @@ static void do_test_fixup(struct bpf_test *test, enum bpf_prog_type prog_type, fixup_map_reuseport_array++; } while (*fixup_map_reuseport_array); } + if (*fixup_map_ringbuf) { + map_fds[20] = create_map(BPF_MAP_TYPE_RINGBUF, 0, + 0, 4096); + do { + prog[*fixup_map_ringbuf].imm = map_fds[20]; + fixup_map_ringbuf++; + } while (*fixup_map_ringbuf); + } } struct libcap { diff --git a/tools/testing/selftests/bpf/verifier/spill_fill.c b/tools/testing/selftests/bpf/verifier/spill_fill.c index 45d43bf82f26..0b943897aaf6 100644 --- a/tools/testing/selftests/bpf/verifier/spill_fill.c +++ b/tools/testing/selftests/bpf/verifier/spill_fill.c @@ -28,6 +28,36 @@ .result = ACCEPT, .result_unpriv = ACCEPT, }, +{ + "check valid spill/fill, ptr to mem", + .insns = { + /* reserve 8 byte ringbuf memory */ + BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0), + BPF_LD_MAP_FD(BPF_REG_1, 0), + BPF_MOV64_IMM(BPF_REG_2, 8), + BPF_MOV64_IMM(BPF_REG_3, 0), + BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_ringbuf_reserve), + /* store a pointer to the reserved memory in R6 */ + BPF_MOV64_REG(BPF_REG_6, BPF_REG_0), + /* check whether the reservation was successful */ + BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 6), + /* spill R6(mem) into the stack */ + BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_6, -8), + /* fill it back in R7 */ + BPF_LDX_MEM(BPF_DW, BPF_REG_7, BPF_REG_10, -8), + /* should be able to access *(R7) = 0 */ + BPF_ST_MEM(BPF_DW, BPF_REG_7, 0, 0), + /* submit the reserved ringbuf memory */ + BPF_MOV64_REG(BPF_REG_1, BPF_REG_7), + BPF_MOV64_IMM(BPF_REG_2, 0), + BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_ringbuf_submit), + BPF_MOV64_IMM(BPF_REG_0, 0), + BPF_EXIT_INSN(), + }, + .fixup_map_ringbuf = { 1 }, + .result = ACCEPT, + .result_unpriv = ACCEPT, +}, { "check corrupted spill/fill", .insns = { -- GitLab