cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

event_output.c (3308B)

      1/* instructions used to output a skb based software event, produced
      2 * from code snippet:
      3 * struct TMP {
      4 *  uint64_t tmp;
      5 * } tt;
      6 * tt.tmp = 5;
      7 * bpf_perf_event_output(skb, &connection_tracking_event_map, 0,
      8 *			 &tt, sizeof(tt));
      9 * return 1;
     10 *
     11 * the bpf assembly from llvm is:
     12 *        0:       b7 02 00 00 05 00 00 00         r2 = 5
     13 *        1:       7b 2a f8 ff 00 00 00 00         *(u64 *)(r10 - 8) = r2
     14 *        2:       bf a4 00 00 00 00 00 00         r4 = r10
     15 *        3:       07 04 00 00 f8 ff ff ff         r4 += -8
     16 *        4:       18 02 00 00 00 00 00 00 00 00 00 00 00 00 00 00    r2 = 0ll
     17 *        6:       b7 03 00 00 00 00 00 00         r3 = 0
     18 *        7:       b7 05 00 00 08 00 00 00         r5 = 8
     19 *        8:       85 00 00 00 19 00 00 00         call 25
     20 *        9:       b7 00 00 00 01 00 00 00         r0 = 1
     21 *       10:       95 00 00 00 00 00 00 00         exit
     22 *
     23 *     The reason I put the code here instead of fill_helpers is that map fixup
     24 *     is against the insns, instead of filled prog.
     25 */
     26
     27#define __PERF_EVENT_INSNS__					\
     28	BPF_MOV64_IMM(BPF_REG_2, 5),				\
     29	BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_2, -8),		\
     30	BPF_MOV64_REG(BPF_REG_4, BPF_REG_10),			\
     31	BPF_ALU64_IMM(BPF_ADD, BPF_REG_4, -8),			\
     32	BPF_LD_MAP_FD(BPF_REG_2, 0),				\
     33	BPF_MOV64_IMM(BPF_REG_3, 0),				\
     34	BPF_MOV64_IMM(BPF_REG_5, 8),				\
     35	BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0,		\
     36		     BPF_FUNC_perf_event_output),		\
     37	BPF_MOV64_IMM(BPF_REG_0, 1),				\
     38	BPF_EXIT_INSN(),
     39{
     40	"perfevent for sockops",
     41	.insns = { __PERF_EVENT_INSNS__ },
     42	.prog_type = BPF_PROG_TYPE_SOCK_OPS,
     43	.fixup_map_event_output = { 4 },
     44	.result = ACCEPT,
     45	.retval = 1,
     46},
     47{
     48	"perfevent for tc",
     49	.insns =  { __PERF_EVENT_INSNS__ },
     50	.prog_type = BPF_PROG_TYPE_SCHED_CLS,
     51	.fixup_map_event_output = { 4 },
     52	.result = ACCEPT,
     53	.retval = 1,
     54},
     55{
     56	"perfevent for lwt out",
     57	.insns =  { __PERF_EVENT_INSNS__ },
     58	.prog_type = BPF_PROG_TYPE_LWT_OUT,
     59	.fixup_map_event_output = { 4 },
     60	.result = ACCEPT,
     61	.retval = 1,
     62},
     63{
     64	"perfevent for xdp",
     65	.insns =  { __PERF_EVENT_INSNS__ },
     66	.prog_type = BPF_PROG_TYPE_XDP,
     67	.fixup_map_event_output = { 4 },
     68	.result = ACCEPT,
     69	.retval = 1,
     70},
     71{
     72	"perfevent for socket filter",
     73	.insns =  { __PERF_EVENT_INSNS__ },
     74	.prog_type = BPF_PROG_TYPE_SOCKET_FILTER,
     75	.fixup_map_event_output = { 4 },
     76	.result = ACCEPT,
     77	.retval = 1,
     78},
     79{
     80	"perfevent for sk_skb",
     81	.insns =  { __PERF_EVENT_INSNS__ },
     82	.prog_type = BPF_PROG_TYPE_SK_SKB,
     83	.fixup_map_event_output = { 4 },
     84	.result = ACCEPT,
     85	.retval = 1,
     86},
     87{
     88	"perfevent for cgroup skb",
     89	.insns =  { __PERF_EVENT_INSNS__ },
     90	.prog_type = BPF_PROG_TYPE_CGROUP_SKB,
     91	.fixup_map_event_output = { 4 },
     92	.result = ACCEPT,
     93	.retval = 1,
     94},
     95{
     96	"perfevent for cgroup dev",
     97	.insns =  { __PERF_EVENT_INSNS__ },
     98	.prog_type = BPF_PROG_TYPE_CGROUP_DEVICE,
     99	.fixup_map_event_output = { 4 },
    100	.result = ACCEPT,
    101	.retval = 1,
    102},
    103{
    104	"perfevent for cgroup sysctl",
    105	.insns =  { __PERF_EVENT_INSNS__ },
    106	.prog_type = BPF_PROG_TYPE_CGROUP_SYSCTL,
    107	.fixup_map_event_output = { 4 },
    108	.result = ACCEPT,
    109	.retval = 1,
    110},
    111{
    112	"perfevent for cgroup sockopt",
    113	.insns =  { __PERF_EVENT_INSNS__ },
    114	.prog_type = BPF_PROG_TYPE_CGROUP_SOCKOPT,
    115	.expected_attach_type = BPF_CGROUP_SETSOCKOPT,
    116	.fixup_map_event_output = { 4 },
    117	.result = ACCEPT,
    118	.retval = 1,
    119},