D7net
Home
Console
Upload
information
Create File
Create Folder
About
Tools
:
/
usr
/
share
/
systemtap
/
tapset
/
bpf
/
Filename :
context.stp
back
Copy
// context tapset // Copyright (C) 2016-2018 Red Hat Inc. // // This file is part of systemtap, and is free software. You can // redistribute it and/or modify it under the terms of the GNU General // Public License (GPL); either version 2, or (at your option) any // later version. /** * sfunction execname - Returns the execname of a target process (or group of processes) * * Description: Returns the execname of a target process (or group of processes). */ function execname:string () %{ /* bpf */ /* pure */ /* unprivileged */ /* stable */ /* buf = bpf_stk_alloc(BPF_MAXSTRINGLEN); buf[0] = 0x0; // guarantee NUL byte rc = get_current_comm(buf, BPF_MAXSTRINGLEN); */ alloc, $buf, BPF_MAXSTRINGLEN; 0x62, $buf, -, -, 0x0; /* stw [$buf+0], 0x0 -- guarantee NUL byte */ call, $rc, get_current_comm, $buf, BPF_MAXSTRINGLEN; /* if (rc < 0) return err_msg; return buf; */ 0xa5, $rc, 0, _err, -; /* jlt $rc, 0, _err */ 0xbf, $$, $buf, -, -; /* mov $$, $buf */ 0x05, -, -, _done, -; /* ja _done */ label, _err; 0xbf, $$, "<unknown>", -, -; /* mov $$, <unknown> */ label, _done; %} // TODO: pexecname () /** * sfunction pid - Returns the ID of a thread group * * Description: This function returns the userspace pid / kernel tgid * of a target process. */ function pid:long () %{ /* bpf */ /* pure */ /* unprivileged */ /* stable */ /* BPF_FUNC_get_current_pid_tgid returns tgid << 32 | pid */ 0x85, 0, 0, 0, 14; /* call BPF_FUNC_get_current_pid_tgid */ 0xbf, $$, 0, 0, 0; /* movx $$, r0 */ 0x77, $$, 0, 0, 32 /* rshk $$, 32 */ %} // TODO: ns_pid:long () /** * sfunction tid - Returns the thread ID of a target process * * Description: This function returns the userspace tid / kernel pid * of a target process. */ function tid:long () %{ /* bpf */ /* pure */ /* unprivileged */ /* stable */ /* BPF_FUNC_get_current_pid_tgid returns tgid << 32 | pid */ 0x85, 0, 0, 0, 14; /* call BPF_FUNC_get_current_pid_tgid */ 0xbc, $$, 0, 0, 0 /* movwx $$, r0 */ %} // TODO: ns_tid:long () // TODO: ppid:long () // TODO: ns_ppid:long () // TODO: pgrp:long () // TODO: ns_pgrp:long () // TODO: sid:long () // TODO: ns_sid:long () /** * sfunction gid - Returns the group ID of a target process * * Description: This function returns the group ID of a target process. */ function gid:long () %{ /* bpf */ /* pure */ /* unprivileged */ /* stable */ /* BPF_FUNC_get_current_uid_gid returns gid << 32 | uid */ 0x85, 0, 0, 0, 15; /* call BPF_FUNC_get_current_uid_gid */ 0xbf, $$, 0, 0, 0; /* movx $$, r0 */ 0x77, $$, 0, 0, 32 /* rshk $$, 32 */ %} // TODO: ns_gid:long () // TODO: egid:long () // TODO: ns_egid:long () /** * sfunction uid - Returns the user ID of a target process * * Description: This function returns the user ID of the target process. */ function uid:long () %{ /* bpf */ /* pure */ /* unprivileged */ /* stable */ /* BPF_FUNC_get_current_uid_gid returns gid << 32 | uid */ 0x85, 0, 0, 0, 15; /* call BPF_FUNC_get_current_uid_gid */ 0xbc, $$, 0, 0, 0 /* movwx $$, r0 */ %} // TODO: ns_uid:long () // TODO: euid:long () // TODO: ns_euid:long () // XXX: is_myproc () is only relevant for unprivileged use of eBPF (still theoretical). // TODO: Old systemtap-compat scripts should not be running on eBPF backend in the first place? /** * sfunction cpuid - Returns the current cpu number * * Description: This function returns the current cpu number. * Deprecated in SystemTap 1.4 and removed in SystemTap 1.5. */ %( systemtap_v <= "1.4" %? function cpuid:long () %{ /* bpf */ /* pure */ 0x85, 0, 0, 0, 8; /* call BPF_FUNC_get_smp_processor_id */ 0xbf, $$, 0, 0, 0 /* movx $$, r0 */ %} %) /** * sfunction cpu - Returns the current cpu number * * Description: This function returns the current cpu number. */ function cpu:long () %{ /* bpf */ /* pure */ /* unprivileged */ /* stable */ 0x85, 0, 0, 0, 8; /* call BPF_FUNC_get_smp_processor_id */ 0xbf, $$, 0, 0, 0 /* movx $$, r0 */ %} // TODO: registers_valid:long () // TODO: user_mode:long () // TODO: is_return:long () // TODO: target:long () // TODO: module_name:string () // XXX: module_size:string () -- not clear if this should refer to the entire .bo or to just the current eBPF routine. // TODO: stp_pid:long () // XXX: remote_id:long (), remote_uri:string() -- pending an evaluation of remote eBPF execution. // XXX: stack_size() -- not clear if this should be the eBPF stack size or the kernel stack size. // XXX: stack_used(),stack_unused() probably a fairly ill-defined idea with the eBPF stack. // TODO: Other context functions for info about things like eBPF maps. // TODO: addr:long () // TODO: uaddr:long () // XXX: cmdline_args:string(n:long, m:long, delim:string) -- requires string concatenation & loops. // TODO: cmdline_arg:string(n:long) // XXX: cmdline_string:string() -- requires string concatenation & loops.