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Add security_task_prctl event #4583

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Add security_task_prctl event #4583

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235 changes: 235 additions & 0 deletions pkg/ebpf/c/tracee.bpf.c
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Original file line number Diff line number Diff line change
Expand Up @@ -5296,6 +5296,241 @@ int BPF_KPROBE(trace_chmod_common)
return events_perf_submit(&p, 0);
}

SEC("kprobe/security_task_prctl")
int BPF_KPROBE(trace_security_task_prctl)
{
program_data_t p = {};
if (!init_program_data(&p, ctx, SECURITY_TASK_PRCTL))
return 0;

if (!evaluate_scope_filters(&p))
return 0;

// Save raw args
int option = PT_REGS_PARM1(ctx);
unsigned long arg2 = PT_REGS_PARM2(ctx);
unsigned long arg3 = PT_REGS_PARM3(ctx);
unsigned long arg4 = PT_REGS_PARM4(ctx);
unsigned long arg5 = PT_REGS_PARM5(ctx);
save_to_submit_buf(&p.event->args_buf, &option, sizeof(option), 0);
save_to_submit_buf(&p.event->args_buf, &arg2, sizeof(arg2), 1);
save_to_submit_buf(&p.event->args_buf, &arg3, sizeof(arg3), 2);
save_to_submit_buf(&p.event->args_buf, &arg4, sizeof(arg4), 3);
save_to_submit_buf(&p.event->args_buf, &arg5, sizeof(arg5), 4);

// Save PR_SET_VMA arg
if (option == PR_SET_VMA && arg2 == PR_SET_VMA_ANON_NAME && arg5 != 0)
save_str_to_buf(&p.event->args_buf, (char *) arg5, 5);

// Save PR_SET_MM args
if (option == PR_SET_MM) {
// Save all old mm info regardless of operation
struct mm_struct *mm = get_mm_from_task(p.event->task);
save_to_submit_buf(&p.event->args_buf,
__builtin_preserve_access_index(&mm->start_code),
sizeof(mm->start_code),
6);
save_to_submit_buf(&p.event->args_buf,
__builtin_preserve_access_index(&mm->end_code),
sizeof(mm->end_code),
7);
save_to_submit_buf(&p.event->args_buf,
__builtin_preserve_access_index(&mm->start_data),
sizeof(mm->start_data),
8);
save_to_submit_buf(&p.event->args_buf,
__builtin_preserve_access_index(&mm->end_data),
sizeof(mm->end_data),
9);
save_to_submit_buf(&p.event->args_buf,
__builtin_preserve_access_index(&mm->start_brk),
sizeof(mm->start_brk),
10);
save_to_submit_buf(
&p.event->args_buf, __builtin_preserve_access_index(&mm->brk), sizeof(mm->brk), 11);
save_to_submit_buf(&p.event->args_buf,
__builtin_preserve_access_index(&mm->start_stack),
sizeof(mm->start_stack),
12);
save_to_submit_buf(&p.event->args_buf,
__builtin_preserve_access_index(&mm->arg_start),
sizeof(mm->arg_start),
13);
save_to_submit_buf(&p.event->args_buf,
__builtin_preserve_access_index(&mm->arg_end),
sizeof(mm->arg_end),
14);
save_to_submit_buf(&p.event->args_buf,
__builtin_preserve_access_index(&mm->env_start),
sizeof(mm->env_start),
15);
save_to_submit_buf(&p.event->args_buf,
__builtin_preserve_access_index(&mm->env_end),
sizeof(mm->env_end),
16);
void *saved_auxv;
u32 size;
if (bpf_core_field_exists(mm->saved_auxv)) {
saved_auxv = BPF_CORE_READ(mm, saved_auxv);
size = bpf_core_field_size(mm->saved_auxv);
}
// Red Hat version
else {
struct mm_struct___redhat *mm_redhat = (struct mm_struct___redhat *) mm;
saved_auxv = BPF_CORE_READ(mm_redhat, mm_rh, saved_auxv);
size = bpf_core_field_size(mm_redhat->mm_rh->saved_auxv);
}
save_bytes_to_buf(&p.event->args_buf, saved_auxv, size, 17);

struct file *exe = BPF_CORE_READ(mm, exe_file);
void *exe_path = get_path_str(__builtin_preserve_access_index(&exe->f_path));
dev_t exe_dev = get_dev_from_file(exe);
unsigned long exe_inode = get_inode_nr_from_file(exe);
u64 exe_ctime = get_ctime_nanosec_from_file(exe);
umode_t exe_inode_mode = get_inode_mode_from_file(exe);

save_str_to_buf(&p.event->args_buf, exe_path, 18);
save_to_submit_buf(&p.event->args_buf, &exe_dev, sizeof(exe_dev), 19);
save_to_submit_buf(&p.event->args_buf, &exe_inode, sizeof(exe_inode), 20);
save_to_submit_buf(&p.event->args_buf, &exe_ctime, sizeof(exe_ctime), 21);
save_to_submit_buf(&p.event->args_buf, &exe_inode_mode, sizeof(exe_inode_mode), 22);

struct prctl_mm_map *mm_map;

// Save new mm info according to operation
switch (arg2) {
case PR_SET_MM_START_CODE:
save_to_submit_buf(&p.event->args_buf, &arg3, sizeof(arg3), 23);
break;
case PR_SET_MM_END_CODE:
save_to_submit_buf(&p.event->args_buf, &arg3, sizeof(arg3), 24);
break;
case PR_SET_MM_START_DATA:
save_to_submit_buf(&p.event->args_buf, &arg3, sizeof(arg3), 25);
break;
case PR_SET_MM_END_DATA:
save_to_submit_buf(&p.event->args_buf, &arg3, sizeof(arg3), 26);
break;
case PR_SET_MM_START_BRK:
save_to_submit_buf(&p.event->args_buf, &arg3, sizeof(arg3), 27);
break;
case PR_SET_MM_BRK:
save_to_submit_buf(&p.event->args_buf, &arg3, sizeof(arg3), 28);
break;
case PR_SET_MM_START_STACK:
save_to_submit_buf(&p.event->args_buf, &arg3, sizeof(arg3), 29);
break;
case PR_SET_MM_ARG_START:
save_to_submit_buf(&p.event->args_buf, &arg3, sizeof(arg3), 30);
break;
case PR_SET_MM_ARG_END:
save_to_submit_buf(&p.event->args_buf, &arg3, sizeof(arg3), 31);
break;
case PR_SET_MM_ENV_START:
save_to_submit_buf(&p.event->args_buf, &arg3, sizeof(arg3), 32);
break;
case PR_SET_MM_ENV_END:
save_to_submit_buf(&p.event->args_buf, &arg3, sizeof(arg3), 33);
break;
case PR_SET_MM_AUXV:
save_bytes_to_buf(&p.event->args_buf, (void *) arg3, arg4, 34);
break;
case PR_SET_MM_EXE_FILE:
exe = get_struct_file_from_fd(arg3);
exe_path = get_path_str(__builtin_preserve_access_index(&exe->f_path));
exe_dev = get_dev_from_file(exe);
exe_inode = get_inode_nr_from_file(exe);
exe_ctime = get_ctime_nanosec_from_file(exe);
exe_inode_mode = get_inode_mode_from_file(exe);

save_str_to_buf(&p.event->args_buf, exe_path, 35);
save_to_submit_buf(&p.event->args_buf, &exe_dev, sizeof(exe_dev), 36);
save_to_submit_buf(&p.event->args_buf, &exe_inode, sizeof(exe_inode), 37);
save_to_submit_buf(&p.event->args_buf, &exe_ctime, sizeof(exe_ctime), 38);
save_to_submit_buf(&p.event->args_buf, &exe_inode_mode, sizeof(exe_inode_mode), 39);

break;
case PR_SET_MM_MAP:
mm_map = (struct prctl_mm_map *) arg3;
save_to_submit_buf(&p.event->args_buf,
__builtin_preserve_access_index(&mm_map->start_code),
sizeof(mm_map->start_code),
23);
save_to_submit_buf(&p.event->args_buf,
__builtin_preserve_access_index(&mm_map->end_code),
sizeof(mm_map->end_code),
24);
save_to_submit_buf(&p.event->args_buf,
__builtin_preserve_access_index(&mm_map->start_data),
sizeof(mm_map->start_data),
25);
save_to_submit_buf(&p.event->args_buf,
__builtin_preserve_access_index(&mm_map->end_data),
sizeof(mm_map->end_data),
26);
save_to_submit_buf(&p.event->args_buf,
__builtin_preserve_access_index(&mm_map->start_brk),
sizeof(mm_map->start_brk),
27);
save_to_submit_buf(&p.event->args_buf,
__builtin_preserve_access_index(&mm_map->brk),
sizeof(mm_map->brk),
28);
save_to_submit_buf(&p.event->args_buf,
__builtin_preserve_access_index(&mm_map->start_stack),
sizeof(mm_map->start_stack),
29);
save_to_submit_buf(&p.event->args_buf,
__builtin_preserve_access_index(&mm_map->arg_start),
sizeof(mm_map->arg_start),
30);
save_to_submit_buf(&p.event->args_buf,
__builtin_preserve_access_index(&mm_map->arg_end),
sizeof(mm_map->arg_end),
31);
save_to_submit_buf(&p.event->args_buf,
__builtin_preserve_access_index(&mm_map->env_start),
sizeof(mm_map->env_start),
32);
save_to_submit_buf(&p.event->args_buf,
__builtin_preserve_access_index(&mm_map->env_end),
sizeof(mm_map->env_end),
33);
save_bytes_to_buf(&p.event->args_buf,
BPF_CORE_READ_USER(mm_map, auxv),
BPF_CORE_READ_USER(mm_map, auxv_size),
34);

exe = get_struct_file_from_fd(BPF_CORE_READ_USER(mm_map, exe_fd));
exe_path = get_path_str(__builtin_preserve_access_index(&exe->f_path));
exe_dev = get_dev_from_file(exe);
exe_inode = get_inode_nr_from_file(exe);
exe_ctime = get_ctime_nanosec_from_file(exe);
exe_inode_mode = get_inode_mode_from_file(exe);

save_str_to_buf(&p.event->args_buf, exe_path, 35);
save_to_submit_buf(&p.event->args_buf, &exe_dev, sizeof(exe_dev), 36);
save_to_submit_buf(&p.event->args_buf, &exe_inode, sizeof(exe_inode), 37);
save_to_submit_buf(&p.event->args_buf, &exe_ctime, sizeof(exe_ctime), 38);
save_to_submit_buf(&p.event->args_buf, &exe_inode_mode, sizeof(exe_inode_mode), 39);

break;
default:
// unknown/invalid operation
return 0;
}
}

// Save old securebits for PR_SET_SECUREBITS
if (option == PR_SET_SECUREBITS) {
struct task_struct *task = p.event->task;
unsigned int old_securebits = BPF_CORE_READ(task, cred, securebits);
save_to_submit_buf(&p.event->args_buf, &old_securebits, sizeof(old_securebits), 40);
}

return events_perf_submit(&p, 0);
}

//
// Syscall checkers
//
Expand Down
1 change: 1 addition & 0 deletions pkg/ebpf/c/types.h
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Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -134,6 +134,7 @@ enum event_id_e
SECURITY_TASK_SETRLIMIT,
SECURITY_SETTIME64,
CHMOD_COMMON,
SECURITY_TASK_PRCTL,
MAX_EVENT_ID,
NO_EVENT_SUBMIT,

Expand Down
40 changes: 32 additions & 8 deletions pkg/ebpf/c/vmlinux.h
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Original file line number Diff line number Diff line change
Expand Up @@ -293,6 +293,7 @@ struct task_struct {
u64 start_boottime;
u64 real_start_time;
const struct cred *real_cred;
const struct cred *cred;
char comm[16];
struct files_struct *files;
struct nsproxy *nsproxy;
Expand Down Expand Up @@ -699,17 +700,40 @@ struct rb_root {
struct mm_struct {
struct {
struct rb_root mm_rb;
long unsigned int stack_vm;
long unsigned int start_brk;
long unsigned int brk;
long unsigned int start_stack;
long unsigned int arg_start;
long unsigned int arg_end;
long unsigned int env_start;
long unsigned int env_end;
unsigned long stack_vm;
unsigned long start_code;
unsigned long end_code;
unsigned long start_data;
unsigned long end_data;
unsigned long start_brk;
unsigned long brk;
unsigned long start_stack;
unsigned long arg_start;
unsigned long arg_end;
unsigned long env_start;
unsigned long env_end;
unsigned long saved_auxv[0]; // length can be obtained at runtime using bpf_core_file_size()
struct file *exe_file;
};
};

struct prctl_mm_map {
__u64 start_code;
__u64 end_code;
__u64 start_data;
__u64 end_data;
__u64 start_brk;
__u64 brk;
__u64 start_stack;
__u64 arg_start;
__u64 arg_end;
__u64 env_start;
__u64 env_end;
__u64 *auxv;
__u32 auxv_size;
__u32 exe_fd;
};

struct vfsmount {
struct dentry *mnt_root;
};
Expand Down
25 changes: 25 additions & 0 deletions pkg/ebpf/c/vmlinux_flavors.h
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Original file line number Diff line number Diff line change
Expand Up @@ -105,6 +105,31 @@ struct inode___older_v611 {
struct timespec64 __i_ctime;
};

// Red Hat mm_struct variation
struct mm_struct_rh {
unsigned long saved_auxv[0]; // length can be obtained at runtime using bpf_core_file_size()
};

struct mm_struct___redhat {
struct {
unsigned long start_code;
unsigned long end_code;
unsigned long start_data;
unsigned long end_data;
unsigned long start_brk;
unsigned long brk;
unsigned long start_stack;
unsigned long arg_start;
unsigned long arg_end;
unsigned long env_start;
unsigned long env_end;
struct file *exe_file;
};
union {
struct mm_struct_rh *mm_rh;
};
};

///////////////////

#pragma clang attribute pop
Expand Down
20 changes: 20 additions & 0 deletions pkg/ebpf/c/vmlinux_missing.h
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Original file line number Diff line number Diff line change
Expand Up @@ -266,4 +266,24 @@ static inline struct inet_sock *inet_sk(const struct sock *sk)
#define IPPROTO_DSTOPTS 60 // IPv6 destination options
#define IPPROTO_MH 135 // IPv6 mobility header

#define PR_SET_SECUREBITS 28
#define PR_SET_MM 35
#define PR_SET_MM_START_CODE 1
#define PR_SET_MM_END_CODE 2
#define PR_SET_MM_START_DATA 3
#define PR_SET_MM_END_DATA 4
#define PR_SET_MM_START_STACK 5
#define PR_SET_MM_START_BRK 6
#define PR_SET_MM_BRK 7
#define PR_SET_MM_ARG_START 8
#define PR_SET_MM_ARG_END 9
#define PR_SET_MM_ENV_START 10
#define PR_SET_MM_ENV_END 11
#define PR_SET_MM_AUXV 12
#define PR_SET_MM_EXE_FILE 13
#define PR_SET_MM_MAP 14
#define PR_SET_MM_MAP_SIZE 15
#define PR_SET_VMA 0x53564d41
#define PR_SET_VMA_ANON_NAME 0

#endif
1 change: 1 addition & 0 deletions pkg/ebpf/probes/probe_group.go
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Original file line number Diff line number Diff line change
Expand Up @@ -257,6 +257,7 @@ func NewDefaultProbeGroup(module *bpf.Module, netEnabled bool) (*ProbeGroup, err
Dup3: NewTraceProbe(SyscallEnter, "dup3", "trace_dup3"),
Dup3Ret: NewTraceProbe(SyscallExit, "dup3", "trace_ret_dup3"),
ChmodCommon: NewTraceProbe(KProbe, "chmod_common", "trace_chmod_common"),
SecurityTaskPrctl: NewTraceProbe(KProbe, "security_task_prctl", "trace_security_task_prctl"),

TestUnavailableHook: NewTraceProbe(KProbe, "non_existing_func", "empty_kprobe"),
ExecTest: NewTraceProbe(RawTracepoint, "raw_syscalls:sched_process_exec", "tracepoint__exec_test"),
Expand Down
1 change: 1 addition & 0 deletions pkg/ebpf/probes/probes.go
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Original file line number Diff line number Diff line change
Expand Up @@ -162,6 +162,7 @@ const (
Dup3
Dup3Ret
ChmodCommon
SecurityTaskPrctl
)

// Test probe handles
Expand Down
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