2 * Copyright (C) 2011 EfficiOS Inc.
3 * Copyright (C) 2011 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
4 * Copyright (C) 2019 Jérémie Galarneau <jeremie.galarneau@efficios.com>
6 * SPDX-License-Identifier: LGPL-2.1-only
22 #include <sys/types.h>
26 #include <common/bytecode/bytecode.h>
27 #include <common/lttng-kernel.h>
28 #include <common/common.h>
29 #include <common/utils.h>
30 #include <common/compat/errno.h>
31 #include <common/compat/getenv.h>
32 #include <common/compat/string.h>
33 #include <common/unix.h>
34 #include <common/defaults.h>
35 #include <common/lttng-elf.h>
36 #include <common/thread.h>
38 #include <lttng/constant.h>
40 #include <common/sessiond-comm/sessiond-comm.h>
41 #include <common/filter/filter-ast.h>
45 #define GETPW_BUFFER_FALLBACK_SIZE 4096
49 typedef int (*run_as_fct
)(struct run_as_data
*data
, struct run_as_ret
*ret_value
);
54 RUN_AS_MKDIR_RECURSIVE
,
55 RUN_AS_MKDIRAT_RECURSIVE
,
62 RUN_AS_RMDIR_RECURSIVE
,
63 RUN_AS_RMDIRAT_RECURSIVE
,
66 RUN_AS_EXTRACT_ELF_SYMBOL_OFFSET
,
67 RUN_AS_EXTRACT_SDT_PROBE_OFFSETS
,
68 RUN_AS_GENERATE_FILTER_BYTECODE
,
71 struct run_as_mkdir_data
{
73 char path
[LTTNG_PATH_MAX
];
77 struct run_as_open_data
{
79 char path
[LTTNG_PATH_MAX
];
84 struct run_as_unlink_data
{
86 char path
[LTTNG_PATH_MAX
];
89 struct run_as_rmdir_data
{
91 char path
[LTTNG_PATH_MAX
];
92 int flags
; /* enum lttng_directory_handle_rmdir_recursive_flags. */
95 struct run_as_extract_elf_symbol_offset_data
{
97 char function
[LTTNG_SYMBOL_NAME_LEN
];
100 struct run_as_extract_sdt_probe_offsets_data
{
102 char probe_name
[LTTNG_SYMBOL_NAME_LEN
];
103 char provider_name
[LTTNG_SYMBOL_NAME_LEN
];
106 struct run_as_generate_filter_bytecode_data
{
107 char filter_expression
[LTTNG_FILTER_MAX_LEN
];
110 struct run_as_rename_data
{
116 char old_path
[LTTNG_PATH_MAX
];
117 char new_path
[LTTNG_PATH_MAX
];
120 struct run_as_open_ret
{
124 struct run_as_extract_elf_symbol_offset_ret
{
128 struct run_as_extract_sdt_probe_offsets_ret
{
130 uint64_t offsets
[LTTNG_KERNEL_ABI_MAX_UPROBE_NUM
];
133 struct run_as_generate_filter_bytecode_ret
{
134 /* A lttng_bytecode_filter struct with 'dynamic' payload. */
135 char bytecode
[LTTNG_FILTER_MAX_LEN
];
141 struct run_as_mkdir_data mkdir
;
142 struct run_as_open_data open
;
143 struct run_as_unlink_data unlink
;
144 struct run_as_rmdir_data rmdir
;
145 struct run_as_rename_data rename
;
146 struct run_as_extract_elf_symbol_offset_data extract_elf_symbol_offset
;
147 struct run_as_extract_sdt_probe_offsets_data extract_sdt_probe_offsets
;
148 struct run_as_generate_filter_bytecode_data generate_filter_bytecode
;
155 * The run_as_ret structure holds the returned value and status of the command.
157 * The `u` union field holds the return value of the command; in most cases it
158 * represents the success or the failure of the command. In more complex
159 * commands, it holds a computed value.
161 * The _errno field is the errno recorded after the execution of the command.
163 * The _error fields is used the signify that return status of the command. For
164 * simple commands returning `int` the _error field will be the same as the
165 * ret_int field. In complex commands, it signify the success or failure of the
172 struct run_as_open_ret open
;
173 struct run_as_extract_elf_symbol_offset_ret extract_elf_symbol_offset
;
174 struct run_as_extract_sdt_probe_offsets_ret extract_sdt_probe_offsets
;
175 struct run_as_generate_filter_bytecode_ret generate_filter_bytecode
;
181 #define COMMAND_IN_FDS(data_ptr) ({ \
183 if (command_properties[data_ptr->cmd].in_fds_offset != -1) { \
184 fds = (int *) ((char *) data_ptr + command_properties[data_ptr->cmd].in_fds_offset); \
189 #define COMMAND_OUT_FDS(cmd, ret_ptr) ({ \
191 if (command_properties[cmd].out_fds_offset != -1) { \
192 fds = (int *) ((char *) ret_ptr + command_properties[cmd].out_fds_offset); \
197 #define COMMAND_IN_FD_COUNT(data_ptr) ({ \
198 command_properties[data_ptr->cmd].in_fd_count; \
201 #define COMMAND_OUT_FD_COUNT(cmd) ({ \
202 command_properties[cmd].out_fd_count; \
205 #define COMMAND_USE_CWD_FD(data_ptr) command_properties[data_ptr->cmd].use_cwd_fd
207 struct run_as_command_properties
{
208 /* Set to -1 when not applicable. */
209 ptrdiff_t in_fds_offset
, out_fds_offset
;
210 unsigned int in_fd_count
, out_fd_count
;
214 static const struct run_as_command_properties command_properties
[] = {
216 .in_fds_offset
= offsetof(struct run_as_data
, u
.mkdir
.dirfd
),
218 .out_fds_offset
= -1,
223 .in_fds_offset
= offsetof(struct run_as_data
, u
.mkdir
.dirfd
),
225 .out_fds_offset
= -1,
229 [RUN_AS_MKDIR_RECURSIVE
] = {
230 .in_fds_offset
= offsetof(struct run_as_data
, u
.mkdir
.dirfd
),
232 .out_fds_offset
= -1,
236 [RUN_AS_MKDIRAT_RECURSIVE
] = {
237 .in_fds_offset
= offsetof(struct run_as_data
, u
.mkdir
.dirfd
),
239 .out_fds_offset
= -1,
244 .in_fds_offset
= offsetof(struct run_as_data
, u
.open
.dirfd
),
246 .out_fds_offset
= offsetof(struct run_as_ret
, u
.open
.fd
),
251 .in_fds_offset
= offsetof(struct run_as_data
, u
.open
.dirfd
),
253 .out_fds_offset
= offsetof(struct run_as_ret
, u
.open
.fd
),
258 .in_fds_offset
= offsetof(struct run_as_data
, u
.unlink
.dirfd
),
260 .out_fds_offset
= -1,
264 [RUN_AS_UNLINKAT
] = {
265 .in_fds_offset
= offsetof(struct run_as_data
, u
.unlink
.dirfd
),
267 .out_fds_offset
= -1,
271 [RUN_AS_RMDIR_RECURSIVE
] = {
272 .in_fds_offset
= offsetof(struct run_as_data
, u
.rmdir
.dirfd
),
274 .out_fds_offset
= -1,
278 [RUN_AS_RMDIRAT_RECURSIVE
] = {
279 .in_fds_offset
= offsetof(struct run_as_data
, u
.rmdir
.dirfd
),
281 .out_fds_offset
= -1,
286 .in_fds_offset
= offsetof(struct run_as_data
, u
.rmdir
.dirfd
),
288 .out_fds_offset
= -1,
293 .in_fds_offset
= offsetof(struct run_as_data
, u
.rmdir
.dirfd
),
295 .out_fds_offset
= -1,
300 .in_fds_offset
= offsetof(struct run_as_data
, u
.rename
.dirfds
),
302 .out_fds_offset
= -1,
306 [RUN_AS_RENAMEAT
] = {
307 .in_fds_offset
= offsetof(struct run_as_data
, u
.rename
.dirfds
),
309 .out_fds_offset
= -1,
313 [RUN_AS_EXTRACT_ELF_SYMBOL_OFFSET
] = {
314 .in_fds_offset
= offsetof(struct run_as_data
,
315 u
.extract_elf_symbol_offset
.fd
),
317 .out_fds_offset
= -1,
321 [RUN_AS_EXTRACT_SDT_PROBE_OFFSETS
] = {
322 .in_fds_offset
= offsetof(struct run_as_data
,
323 u
.extract_sdt_probe_offsets
.fd
),
325 .out_fds_offset
= -1,
329 [RUN_AS_GENERATE_FILTER_BYTECODE
] = {
332 .out_fds_offset
= -1,
338 struct run_as_worker
{
339 pid_t pid
; /* Worker PID. */
344 /* Single global worker per process (for now). */
345 static struct run_as_worker
*global_worker
;
346 /* Lock protecting the worker. */
347 static pthread_mutex_t worker_lock
= PTHREAD_MUTEX_INITIALIZER
;
359 return !lttng_secure_getenv("LTTNG_DEBUG_NOCLONE");
364 * Create recursively directory using the FULL path.
367 int _mkdirat_recursive(struct run_as_data
*data
, struct run_as_ret
*ret_value
)
371 struct lttng_directory_handle
*handle
;
373 path
= data
->u
.mkdir
.path
;
374 mode
= data
->u
.mkdir
.mode
;
376 handle
= lttng_directory_handle_create_from_dirfd(data
->u
.mkdir
.dirfd
);
378 ret_value
->_errno
= errno
;
379 ret_value
->_error
= true;
380 ret_value
->u
.ret
= -1;
383 /* Ownership of dirfd is transferred to the handle. */
384 data
->u
.mkdir
.dirfd
= -1;
385 /* Safe to call as we have transitioned to the requested uid/gid. */
386 ret_value
->u
.ret
= lttng_directory_handle_create_subdirectory_recursive(
388 ret_value
->_errno
= errno
;
389 ret_value
->_error
= (ret_value
->u
.ret
) ? true : false;
390 lttng_directory_handle_put(handle
);
392 return ret_value
->u
.ret
;
396 int _mkdirat(struct run_as_data
*data
, struct run_as_ret
*ret_value
)
400 struct lttng_directory_handle
*handle
;
402 path
= data
->u
.mkdir
.path
;
403 mode
= data
->u
.mkdir
.mode
;
405 handle
= lttng_directory_handle_create_from_dirfd(data
->u
.mkdir
.dirfd
);
407 ret_value
->u
.ret
= -1;
408 ret_value
->_errno
= errno
;
409 ret_value
->_error
= true;
412 /* Ownership of dirfd is transferred to the handle. */
413 data
->u
.mkdir
.dirfd
= -1;
414 /* Safe to call as we have transitioned to the requested uid/gid. */
415 ret_value
->u
.ret
= lttng_directory_handle_create_subdirectory(
417 ret_value
->_errno
= errno
;
418 ret_value
->_error
= (ret_value
->u
.ret
) ? true : false;
419 lttng_directory_handle_put(handle
);
421 return ret_value
->u
.ret
;
425 int _open(struct run_as_data
*data
, struct run_as_ret
*ret_value
)
428 struct lttng_directory_handle
*handle
;
430 handle
= lttng_directory_handle_create_from_dirfd(data
->u
.open
.dirfd
);
432 ret_value
->_errno
= errno
;
433 ret_value
->_error
= true;
434 ret_value
->u
.ret
= -1;
437 /* Ownership of dirfd is transferred to the handle. */
438 data
->u
.open
.dirfd
= -1;
440 fd
= lttng_directory_handle_open_file(handle
,
441 data
->u
.open
.path
, data
->u
.open
.flags
,
444 ret_value
->u
.ret
= -1;
445 ret_value
->u
.open
.fd
= -1;
447 ret_value
->u
.ret
= 0;
448 ret_value
->u
.open
.fd
= fd
;
451 ret_value
->_errno
= errno
;
452 ret_value
->_error
= fd
< 0;
453 lttng_directory_handle_put(handle
);
455 return ret_value
->u
.ret
;
459 int _unlink(struct run_as_data
*data
, struct run_as_ret
*ret_value
)
461 struct lttng_directory_handle
*handle
;
463 handle
= lttng_directory_handle_create_from_dirfd(data
->u
.unlink
.dirfd
);
465 ret_value
->u
.ret
= -1;
466 ret_value
->_errno
= errno
;
467 ret_value
->_error
= true;
471 /* Ownership of dirfd is transferred to the handle. */
472 data
->u
.unlink
.dirfd
= -1;
474 ret_value
->u
.ret
= lttng_directory_handle_unlink_file(handle
,
475 data
->u
.unlink
.path
);
476 ret_value
->_errno
= errno
;
477 ret_value
->_error
= (ret_value
->u
.ret
) ? true : false;
478 lttng_directory_handle_put(handle
);
480 return ret_value
->u
.ret
;
484 int _rmdir(struct run_as_data
*data
, struct run_as_ret
*ret_value
)
486 struct lttng_directory_handle
*handle
;
488 handle
= lttng_directory_handle_create_from_dirfd(data
->u
.rmdir
.dirfd
);
490 ret_value
->u
.ret
= -1;
491 ret_value
->_errno
= errno
;
492 ret_value
->_error
= true;
496 /* Ownership of dirfd is transferred to the handle. */
497 data
->u
.rmdir
.dirfd
= -1;
499 ret_value
->u
.ret
= lttng_directory_handle_remove_subdirectory(
500 handle
, data
->u
.rmdir
.path
);
501 ret_value
->_errno
= errno
;
502 ret_value
->_error
= (ret_value
->u
.ret
) ? true : false;
503 lttng_directory_handle_put(handle
);
505 return ret_value
->u
.ret
;
509 int _rmdir_recursive(struct run_as_data
*data
, struct run_as_ret
*ret_value
)
511 struct lttng_directory_handle
*handle
;
513 handle
= lttng_directory_handle_create_from_dirfd(data
->u
.rmdir
.dirfd
);
515 ret_value
->u
.ret
= -1;
516 ret_value
->_errno
= errno
;
517 ret_value
->_error
= true;
521 /* Ownership of dirfd is transferred to the handle. */
522 data
->u
.rmdir
.dirfd
= -1;
524 ret_value
->u
.ret
= lttng_directory_handle_remove_subdirectory_recursive(
525 handle
, data
->u
.rmdir
.path
, data
->u
.rmdir
.flags
);
526 ret_value
->_errno
= errno
;
527 ret_value
->_error
= (ret_value
->u
.ret
) ? true : false;
528 lttng_directory_handle_put(handle
);
530 return ret_value
->u
.ret
;
534 int _rename(struct run_as_data
*data
, struct run_as_ret
*ret_value
)
536 const char *old_path
, *new_path
;
537 struct lttng_directory_handle
*old_handle
= NULL
, *new_handle
= NULL
;
539 old_path
= data
->u
.rename
.old_path
;
540 new_path
= data
->u
.rename
.new_path
;
542 old_handle
= lttng_directory_handle_create_from_dirfd(
543 data
->u
.rename
.dirfds
[0]);
545 ret_value
->u
.ret
= -1;
548 new_handle
= lttng_directory_handle_create_from_dirfd(
549 data
->u
.rename
.dirfds
[1]);
551 ret_value
->u
.ret
= -1;
555 /* Ownership of dirfds are transferred to the handles. */
556 data
->u
.rename
.dirfds
[0] = data
->u
.rename
.dirfds
[1] = -1;
558 /* Safe to call as we have transitioned to the requested uid/gid. */
559 ret_value
->u
.ret
= lttng_directory_handle_rename(
560 old_handle
, old_path
, new_handle
, new_path
);
562 lttng_directory_handle_put(old_handle
);
563 lttng_directory_handle_put(new_handle
);
564 ret_value
->_errno
= errno
;
565 ret_value
->_error
= (ret_value
->u
.ret
) ? true : false;
566 return ret_value
->u
.ret
;
571 int _extract_elf_symbol_offset(struct run_as_data
*data
,
572 struct run_as_ret
*ret_value
)
577 ret_value
->_error
= false;
578 ret
= lttng_elf_get_symbol_offset(data
->u
.extract_elf_symbol_offset
.fd
,
579 data
->u
.extract_elf_symbol_offset
.function
,
582 DBG("Failed to extract ELF function offset");
583 ret_value
->_error
= true;
585 ret_value
->u
.extract_elf_symbol_offset
.offset
= offset
;
591 int _extract_sdt_probe_offsets(struct run_as_data
*data
,
592 struct run_as_ret
*ret_value
)
595 uint64_t *offsets
= NULL
;
598 ret_value
->_error
= false;
600 /* On success, this call allocates the offsets paramater. */
601 ret
= lttng_elf_get_sdt_probe_offsets(
602 data
->u
.extract_sdt_probe_offsets
.fd
,
603 data
->u
.extract_sdt_probe_offsets
.provider_name
,
604 data
->u
.extract_sdt_probe_offsets
.probe_name
,
605 &offsets
, &num_offset
);
608 DBG("Failed to extract SDT probe offsets");
609 ret_value
->_error
= true;
613 if (num_offset
<= 0 || num_offset
> LTTNG_KERNEL_ABI_MAX_UPROBE_NUM
) {
614 DBG("Wrong number of probes.");
616 ret_value
->_error
= true;
620 /* Copy the content of the offsets array to the ret struct. */
621 memcpy(ret_value
->u
.extract_sdt_probe_offsets
.offsets
,
622 offsets
, num_offset
* sizeof(uint64_t));
624 ret_value
->u
.extract_sdt_probe_offsets
.num_offset
= num_offset
;
633 int _extract_elf_symbol_offset(struct run_as_data
*data
,
634 struct run_as_ret
*ret_value
)
636 ERR("Unimplemented runas command RUN_AS_EXTRACT_ELF_SYMBOL_OFFSET");
641 int _extract_sdt_probe_offsets(struct run_as_data
*data
,
642 struct run_as_ret
*ret_value
)
644 ERR("Unimplemented runas command RUN_AS_EXTRACT_SDT_PROBE_OFFSETS");
650 int _generate_filter_bytecode(struct run_as_data
*data
,
651 struct run_as_ret
*ret_value
) {
653 const char *filter_expression
= NULL
;
654 struct filter_parser_ctx
*ctx
= NULL
;
656 ret_value
->_error
= false;
658 filter_expression
= data
->u
.generate_filter_bytecode
.filter_expression
;
660 if (lttng_strnlen(filter_expression
, LTTNG_FILTER_MAX_LEN
- 1) == LTTNG_FILTER_MAX_LEN
- 1) {
661 ret_value
->_error
= true;
666 ret
= filter_parser_ctx_create_from_filter_expression(filter_expression
, &ctx
);
668 ret_value
->_error
= true;
673 DBG("Size of bytecode generated: %u bytes.",
674 bytecode_get_len(&ctx
->bytecode
->b
));
676 /* Copy the lttng_bytecode_filter object to the return structure. */
677 memcpy(ret_value
->u
.generate_filter_bytecode
.bytecode
,
679 sizeof(ctx
->bytecode
->b
) +
680 bytecode_get_len(&ctx
->bytecode
->b
));
684 filter_bytecode_free(ctx
);
686 filter_parser_ctx_free(ctx
);
692 run_as_fct
run_as_enum_to_fct(enum run_as_cmd cmd
)
698 case RUN_AS_MKDIR_RECURSIVE
:
699 case RUN_AS_MKDIRAT_RECURSIVE
:
700 return _mkdirat_recursive
;
705 case RUN_AS_UNLINKAT
:
710 case RUN_AS_RMDIR_RECURSIVE
:
711 case RUN_AS_RMDIRAT_RECURSIVE
:
712 return _rmdir_recursive
;
714 case RUN_AS_RENAMEAT
:
716 case RUN_AS_EXTRACT_ELF_SYMBOL_OFFSET
:
717 return _extract_elf_symbol_offset
;
718 case RUN_AS_EXTRACT_SDT_PROBE_OFFSETS
:
719 return _extract_sdt_probe_offsets
;
720 case RUN_AS_GENERATE_FILTER_BYTECODE
:
721 return _generate_filter_bytecode
;
723 ERR("Unknown command %d", (int) cmd
);
729 int do_send_fds(int sock
, const int *fds
, unsigned int fd_count
)
734 for (i
= 0; i
< fd_count
; i
++) {
736 DBG("Attempt to send invalid file descriptor (fd = %i)",
738 /* Return 0 as this is not a fatal error. */
743 len
= lttcomm_send_fds_unix_sock(sock
, fds
, fd_count
);
744 return len
< 0 ? -1 : 0;
748 int do_recv_fds(int sock
, int *fds
, unsigned int fd_count
)
754 len
= lttcomm_recv_fds_unix_sock(sock
, fds
, fd_count
);
758 } else if (len
< 0) {
759 PERROR("Failed to receive file descriptors from socket");
764 for (i
= 0; i
< fd_count
; i
++) {
766 ERR("Invalid file descriptor received from worker (fd = %i)", fds
[i
]);
767 /* Return 0 as this is not a fatal error. */
775 int send_fds_to_worker(const struct run_as_worker
*worker
,
776 const struct run_as_data
*data
)
781 if (COMMAND_USE_CWD_FD(data
) || COMMAND_IN_FD_COUNT(data
) == 0) {
785 for (i
= 0; i
< COMMAND_IN_FD_COUNT(data
); i
++) {
786 if (COMMAND_IN_FDS(data
)[i
] < 0) {
787 ERR("Refusing to send invalid fd to worker (fd = %i)",
788 COMMAND_IN_FDS(data
)[i
]);
794 ret
= do_send_fds(worker
->sockpair
[0], COMMAND_IN_FDS(data
),
795 COMMAND_IN_FD_COUNT(data
));
797 PERROR("Failed to send file descriptor to run-as worker");
806 int send_fds_to_master(struct run_as_worker
*worker
, enum run_as_cmd cmd
,
807 struct run_as_ret
*run_as_ret
)
812 if (COMMAND_OUT_FD_COUNT(cmd
) == 0) {
816 ret
= do_send_fds(worker
->sockpair
[1], COMMAND_OUT_FDS(cmd
, run_as_ret
),
817 COMMAND_OUT_FD_COUNT(cmd
));
819 PERROR("Failed to send file descriptor to master process");
823 for (i
= 0; i
< COMMAND_OUT_FD_COUNT(cmd
); i
++) {
824 int fd
= COMMAND_OUT_FDS(cmd
, run_as_ret
)[i
];
826 int ret_close
= close(fd
);
829 PERROR("Failed to close result file descriptor (fd = %i)",
839 int recv_fds_from_worker(const struct run_as_worker
*worker
, enum run_as_cmd cmd
,
840 struct run_as_ret
*run_as_ret
)
844 if (COMMAND_OUT_FD_COUNT(cmd
) == 0) {
848 ret
= do_recv_fds(worker
->sockpair
[0], COMMAND_OUT_FDS(cmd
, run_as_ret
),
849 COMMAND_OUT_FD_COUNT(cmd
));
851 PERROR("Failed to receive file descriptor from run-as worker");
859 int recv_fds_from_master(struct run_as_worker
*worker
, struct run_as_data
*data
)
863 if (COMMAND_USE_CWD_FD(data
)) {
866 for (i
= 0; i
< COMMAND_IN_FD_COUNT(data
); i
++) {
867 COMMAND_IN_FDS(data
)[i
] = AT_FDCWD
;
872 if (COMMAND_IN_FD_COUNT(data
) == 0) {
876 ret
= do_recv_fds(worker
->sockpair
[1], COMMAND_IN_FDS(data
),
877 COMMAND_IN_FD_COUNT(data
));
879 PERROR("Failed to receive file descriptors from master process");
887 int cleanup_received_fds(struct run_as_data
*data
)
891 for (i
= 0; i
< COMMAND_IN_FD_COUNT(data
); i
++) {
892 if (COMMAND_IN_FDS(data
)[i
] == -1) {
895 ret
= close(COMMAND_IN_FDS(data
)[i
]);
897 PERROR("Failed to close file descriptor received fd in run-as worker");
905 static int get_user_infos_from_uid(
906 uid_t uid
, char **username
, gid_t
*primary_gid
)
910 long raw_get_pw_buf_size
;
911 size_t get_pw_buf_size
;
913 struct passwd
*result
= NULL
;
915 /* Fetch the max size for the temporary buffer. */
917 raw_get_pw_buf_size
= sysconf(_SC_GETPW_R_SIZE_MAX
);
918 if (raw_get_pw_buf_size
< 0) {
920 PERROR("Failed to query _SC_GETPW_R_SIZE_MAX");
924 /* Limit is indeterminate. */
925 WARN("Failed to query _SC_GETPW_R_SIZE_MAX as it is "
926 "indeterminate; falling back to default buffer size");
927 raw_get_pw_buf_size
= GETPW_BUFFER_FALLBACK_SIZE
;
930 get_pw_buf_size
= (size_t) raw_get_pw_buf_size
;
932 buf
= zmalloc(get_pw_buf_size
);
934 PERROR("Failed to allocate buffer to get password file entries");
938 ret
= getpwuid_r(uid
, &pwd
, buf
, get_pw_buf_size
, &result
);
940 PERROR("Failed to get user information for user: uid = %d",
945 if (result
== NULL
) {
946 ERR("Failed to find user information in password entries: uid = %d",
952 *username
= strdup(result
->pw_name
);
953 if (*username
== NULL
) {
954 PERROR("Failed to copy user name");
958 *primary_gid
= result
->pw_gid
;
970 static int demote_creds(
971 uid_t prev_uid
, gid_t prev_gid
, uid_t new_uid
, gid_t new_gid
)
975 char *username
= NULL
;
977 /* Change the group id. */
978 if (prev_gid
!= new_gid
) {
979 ret
= setegid(new_gid
);
981 PERROR("Failed to set effective group id: new_gid = %d",
987 /* Change the user id. */
988 if (prev_uid
!= new_uid
) {
989 ret
= get_user_infos_from_uid(new_uid
, &username
, &primary_gid
);
995 * Initialize the supplementary group access list.
997 * This is needed to handle cases where the supplementary groups
998 * of the user the process is demoting-to would give it access
999 * to a given file/folder, but not it's primary group.
1003 * Primary Group: User1
1004 * Secondary group: Disk, Network
1006 * mkdir inside the following directory must work since User1
1007 * is part of the Network group.
1009 * drwxrwx--- 2 root Network 4096 Jul 23 17:17 /tmp/my_folder/
1012 * The order of the following initgroups and seteuid calls is
1014 * Only a root process or one with CAP_SETGID capability can
1015 * call the the initgroups() function. We must initialize the
1016 * supplementary groups before we change the effective
1017 * UID to a less-privileged user.
1019 ret
= initgroups(username
, primary_gid
);
1021 PERROR("Failed to init the supplementary group access list: "
1022 "username = `%s`, primary gid = %d", username
,
1027 ret
= seteuid(new_uid
);
1029 PERROR("Failed to set effective user id: new_uid = %d",
1039 static int promote_creds(
1040 uid_t prev_uid
, gid_t prev_gid
, uid_t new_uid
, gid_t new_gid
)
1044 char *username
= NULL
;
1046 /* Change the group id. */
1047 if (prev_gid
!= new_gid
) {
1048 ret
= setegid(new_gid
);
1050 PERROR("Failed to set effective group id: new_gid = %d",
1056 /* Change the user id. */
1057 if (prev_uid
!= new_uid
) {
1058 ret
= get_user_infos_from_uid(new_uid
, &username
, &primary_gid
);
1064 * seteuid call must be done before the initgroups call because
1065 * we need to be privileged (CAP_SETGID) to call initgroups().
1067 ret
= seteuid(new_uid
);
1069 PERROR("Failed to set effective user id: new_uid = %d",
1075 * Initialize the supplementary group access list.
1077 * There is a possibility the groups we set in the following
1078 * initgroups() call are not exactly the same as the ones we
1079 * had when we originally demoted. This can happen if the
1080 * /etc/group file is modified after the runas process is
1081 * forked. This is very unlikely.
1083 ret
= initgroups(username
, primary_gid
);
1085 PERROR("Failed to init the supplementary group access "
1086 "list: username = `%s`, primary gid = %d",
1087 username
, (int) primary_gid
)
1097 * Return < 0 on error, 0 if OK, 1 on hangup.
1100 int handle_one_cmd(struct run_as_worker
*worker
)
1102 int ret
= 0, promote_ret
;
1103 struct run_as_data data
= {};
1104 ssize_t readlen
, writelen
;
1105 struct run_as_ret sendret
= {};
1111 * Stage 1: Receive run_as_data struct from the master.
1112 * The structure contains the command type and all the parameters needed for
1115 readlen
= lttcomm_recv_unix_sock(worker
->sockpair
[1], &data
,
1122 if (readlen
< sizeof(data
)) {
1123 PERROR("lttcomm_recv_unix_sock error");
1128 cmd
= run_as_enum_to_fct(data
.cmd
);
1135 * Stage 2: Receive file descriptor from master.
1136 * Some commands need a file descriptor as input so if it's needed we
1137 * receive the fd using the Unix socket.
1139 ret
= recv_fds_from_master(worker
, &data
);
1141 PERROR("recv_fd_from_master error");
1146 prev_ruid
= getuid();
1147 prev_rgid
= getgid();
1149 ret
= demote_creds(prev_ruid
, prev_rgid
, data
.uid
, data
.gid
);
1155 * Also set umask to 0 for mkdir executable bit.
1160 * Stage 3: Execute the command
1162 ret
= (*cmd
)(&data
, &sendret
);
1164 DBG("Execution of command returned an error");
1168 ret
= cleanup_received_fds(&data
);
1170 ERR("Error cleaning up FD");
1175 * Stage 4: Send run_as_ret structure to the master.
1176 * This structure contain the return value of the command and the errno.
1178 writelen
= lttcomm_send_unix_sock(worker
->sockpair
[1], &sendret
,
1180 if (writelen
< sizeof(sendret
)) {
1181 PERROR("lttcomm_send_unix_sock error");
1187 * Stage 5: Send resulting file descriptors to the master.
1189 ret
= send_fds_to_master(worker
, data
.cmd
, &sendret
);
1191 DBG("Sending FD to master returned an error");
1197 /* Return to previous uid/gid. */
1198 promote_ret
= promote_creds(data
.uid
, data
.gid
, prev_ruid
, prev_rgid
);
1199 if (promote_ret
< 0) {
1200 ERR("Failed to promote back to the initial credentials");
1208 int run_as_worker(struct run_as_worker
*worker
)
1212 struct run_as_ret sendret
;
1213 size_t proc_orig_len
;
1216 * Initialize worker. Set a different process cmdline.
1218 proc_orig_len
= strlen(worker
->procname
);
1219 memset(worker
->procname
, 0, proc_orig_len
);
1220 strncpy(worker
->procname
, DEFAULT_RUN_AS_WORKER_NAME
, proc_orig_len
);
1222 ret
= lttng_thread_setname(DEFAULT_RUN_AS_WORKER_NAME
);
1223 if (ret
&& ret
!= -ENOSYS
) {
1224 /* Don't fail as this is not essential. */
1225 DBG("Failed to set pthread name attribute");
1228 memset(&sendret
, 0, sizeof(sendret
));
1230 writelen
= lttcomm_send_unix_sock(worker
->sockpair
[1], &sendret
,
1232 if (writelen
< sizeof(sendret
)) {
1233 PERROR("lttcomm_send_unix_sock error");
1239 ret
= handle_one_cmd(worker
);
1243 } else if (ret
> 0) {
1246 continue; /* Next command. */
1255 int run_as_cmd(struct run_as_worker
*worker
,
1256 enum run_as_cmd cmd
,
1257 struct run_as_data
*data
,
1258 struct run_as_ret
*ret_value
,
1259 uid_t uid
, gid_t gid
)
1262 ssize_t readlen
, writelen
;
1265 * If we are non-root, we can only deal with our own uid.
1267 if (geteuid() != 0) {
1268 if (uid
!= geteuid()) {
1270 ret_value
->_errno
= EPERM
;
1271 ERR("Client (%d)/Server (%d) UID mismatch (and sessiond is not root)",
1272 (int) uid
, (int) geteuid());
1282 * Stage 1: Send the run_as_data struct to the worker process
1284 writelen
= lttcomm_send_unix_sock(worker
->sockpair
[0], data
,
1286 if (writelen
< sizeof(*data
)) {
1287 PERROR("Error writing message to run_as");
1289 ret_value
->_errno
= EIO
;
1294 * Stage 2: Send file descriptor to the worker process if needed
1296 ret
= send_fds_to_worker(worker
, data
);
1298 PERROR("do_send_fd error");
1300 ret_value
->_errno
= EIO
;
1305 * Stage 3: Wait for the execution of the command
1309 * Stage 4: Receive the run_as_ret struct containing the return value and
1312 readlen
= lttcomm_recv_unix_sock(worker
->sockpair
[0], ret_value
,
1313 sizeof(*ret_value
));
1315 ERR("Run-as worker has hung-up during run_as_cmd");
1317 ret_value
->_errno
= EIO
;
1319 } else if (readlen
< sizeof(*ret_value
)) {
1320 PERROR("Error reading response from run_as");
1322 ret_value
->_errno
= errno
;
1326 if (ret_value
->_error
) {
1327 /* Skip stage 5 on error as there will be no fd to receive. */
1332 * Stage 5: Receive file descriptor if needed
1334 ret
= recv_fds_from_worker(worker
, cmd
, ret_value
);
1336 ERR("Error receiving fd");
1338 ret_value
->_errno
= EIO
;
1346 * This is for debugging ONLY and should not be considered secure.
1349 int run_as_noworker(enum run_as_cmd cmd
,
1350 struct run_as_data
*data
, struct run_as_ret
*ret_value
,
1351 uid_t uid
, gid_t gid
)
1353 int ret
, saved_errno
;
1357 fct
= run_as_enum_to_fct(cmd
);
1363 old_mask
= umask(0);
1364 ret
= fct(data
, ret_value
);
1365 saved_errno
= ret_value
->_errno
;
1367 errno
= saved_errno
;
1373 int reset_sighandler(void)
1377 DBG("Resetting run_as worker signal handlers to default");
1378 for (sig
= 1; sig
<= 31; sig
++) {
1379 (void) signal(sig
, SIG_DFL
);
1385 void worker_sighandler(int sig
)
1387 const char *signame
;
1390 * The worker will inherit its parent's signals since they are part of
1391 * the same process group. However, in the case of SIGINT and SIGTERM,
1392 * we want to give the worker a chance to teardown gracefully when its
1393 * parent closes the command socket.
1400 signame
= "SIGTERM";
1407 DBG("run_as worker received signal %s", signame
);
1409 DBG("run_as_worker received signal %d", sig
);
1414 int set_worker_sighandlers(void)
1418 struct sigaction sa
;
1420 if ((ret
= sigemptyset(&sigset
)) < 0) {
1421 PERROR("sigemptyset");
1425 sa
.sa_handler
= worker_sighandler
;
1426 sa
.sa_mask
= sigset
;
1428 if ((ret
= sigaction(SIGINT
, &sa
, NULL
)) < 0) {
1429 PERROR("sigaction SIGINT");
1433 if ((ret
= sigaction(SIGTERM
, &sa
, NULL
)) < 0) {
1434 PERROR("sigaction SIGTERM");
1438 DBG("run_as signal handler set for SIGTERM and SIGINT");
1444 int run_as_create_worker_no_lock(const char *procname
,
1445 post_fork_cleanup_cb clean_up_func
,
1446 void *clean_up_user_data
)
1451 struct run_as_ret recvret
;
1452 struct run_as_worker
*worker
;
1454 assert(!global_worker
);
1457 * Don't initialize a worker, all run_as tasks will be performed
1458 * in the current process.
1463 worker
= zmalloc(sizeof(*worker
));
1468 worker
->procname
= strdup(procname
);
1469 if (!worker
->procname
) {
1471 goto error_procname_alloc
;
1473 /* Create unix socket. */
1474 if (lttcomm_create_anon_unix_socketpair(worker
->sockpair
) < 0) {
1485 } else if (pid
== 0) {
1490 set_worker_sighandlers();
1492 logger_set_thread_name("Run-as worker", true);
1494 if (clean_up_func
) {
1495 if (clean_up_func(clean_up_user_data
) < 0) {
1496 ERR("Run-as post-fork clean-up failed, exiting.");
1501 /* Just close, no shutdown. */
1502 if (close(worker
->sockpair
[0])) {
1508 * Close all FDs aside from STDIN, STDOUT, STDERR and sockpair[1]
1509 * Sockpair[1] is used as a control channel with the master
1511 for (i
= 3; i
< sysconf(_SC_OPEN_MAX
); i
++) {
1512 if (i
!= worker
->sockpair
[1]) {
1517 worker
->sockpair
[0] = -1;
1518 ret
= run_as_worker(worker
);
1519 if (lttcomm_close_unix_sock(worker
->sockpair
[1])) {
1523 worker
->sockpair
[1] = -1;
1524 free(worker
->procname
);
1526 LOG(ret
? PRINT_ERR
: PRINT_DBG
, "run_as worker exiting (ret = %d)", ret
);
1527 exit(ret
? EXIT_FAILURE
: EXIT_SUCCESS
);
1531 /* Just close, no shutdown. */
1532 if (close(worker
->sockpair
[1])) {
1537 worker
->sockpair
[1] = -1;
1539 /* Wait for worker to become ready. */
1540 readlen
= lttcomm_recv_unix_sock(worker
->sockpair
[0],
1541 &recvret
, sizeof(recvret
));
1542 if (readlen
< sizeof(recvret
)) {
1543 ERR("readlen: %zd", readlen
);
1544 PERROR("Error reading response from run_as at creation");
1548 global_worker
= worker
;
1553 /* Error handling. */
1555 for (i
= 0; i
< 2; i
++) {
1556 if (worker
->sockpair
[i
] < 0) {
1559 if (lttcomm_close_unix_sock(worker
->sockpair
[i
])) {
1562 worker
->sockpair
[i
] = -1;
1565 free(worker
->procname
);
1566 error_procname_alloc
:
1572 void run_as_destroy_worker_no_lock(void)
1574 struct run_as_worker
*worker
= global_worker
;
1576 DBG("Destroying run_as worker");
1580 /* Close unix socket */
1581 DBG("Closing run_as worker socket");
1582 if (lttcomm_close_unix_sock(worker
->sockpair
[0])) {
1585 worker
->sockpair
[0] = -1;
1586 /* Wait for worker. */
1591 wait_ret
= waitpid(worker
->pid
, &status
, 0);
1593 if (errno
== EINTR
) {
1600 if (WIFEXITED(status
)) {
1601 LOG(WEXITSTATUS(status
) == 0 ? PRINT_DBG
: PRINT_ERR
,
1602 DEFAULT_RUN_AS_WORKER_NAME
" terminated with status code %d",
1603 WEXITSTATUS(status
));
1605 } else if (WIFSIGNALED(status
)) {
1606 ERR(DEFAULT_RUN_AS_WORKER_NAME
" was killed by signal %d",
1611 free(worker
->procname
);
1613 global_worker
= NULL
;
1617 int run_as_restart_worker(struct run_as_worker
*worker
)
1620 char *procname
= NULL
;
1622 procname
= worker
->procname
;
1624 /* Close socket to run_as worker process and clean up the zombie process */
1625 run_as_destroy_worker_no_lock();
1627 /* Create a new run_as worker process*/
1628 ret
= run_as_create_worker_no_lock(procname
, NULL
, NULL
);
1630 ERR("Restarting the worker process failed");
1639 int run_as(enum run_as_cmd cmd
, struct run_as_data
*data
,
1640 struct run_as_ret
*ret_value
, uid_t uid
, gid_t gid
)
1642 int ret
, saved_errno
;
1644 pthread_mutex_lock(&worker_lock
);
1646 DBG("Using run_as worker");
1648 assert(global_worker
);
1650 ret
= run_as_cmd(global_worker
, cmd
, data
, ret_value
, uid
, gid
);
1651 saved_errno
= ret_value
->_errno
;
1654 * If the worker thread crashed the errno is set to EIO. we log
1655 * the error and start a new worker process.
1657 if (ret
== -1 && saved_errno
== EIO
) {
1658 DBG("Socket closed unexpectedly... "
1659 "Restarting the worker process");
1660 ret
= run_as_restart_worker(global_worker
);
1662 ERR("Failed to restart worker process.");
1667 DBG("Using run_as without worker");
1668 ret
= run_as_noworker(cmd
, data
, ret_value
, uid
, gid
);
1671 pthread_mutex_unlock(&worker_lock
);
1676 int run_as_mkdir_recursive(const char *path
, mode_t mode
, uid_t uid
, gid_t gid
)
1678 return run_as_mkdirat_recursive(AT_FDCWD
, path
, mode
, uid
, gid
);
1682 int run_as_mkdirat_recursive(int dirfd
, const char *path
, mode_t mode
,
1683 uid_t uid
, gid_t gid
)
1686 struct run_as_data data
= {};
1687 struct run_as_ret run_as_ret
= {};
1689 DBG3("mkdirat() recursive fd = %d%s, path = %s, mode = %d, uid = %d, gid = %d",
1690 dirfd
, dirfd
== AT_FDCWD
? " (AT_FDCWD)" : "",
1691 path
, (int) mode
, (int) uid
, (int) gid
);
1692 ret
= lttng_strncpy(data
.u
.mkdir
.path
, path
,
1693 sizeof(data
.u
.mkdir
.path
));
1695 ERR("Failed to copy path argument of mkdirat recursive command");
1698 data
.u
.mkdir
.path
[sizeof(data
.u
.mkdir
.path
) - 1] = '\0';
1699 data
.u
.mkdir
.mode
= mode
;
1700 data
.u
.mkdir
.dirfd
= dirfd
;
1701 run_as(dirfd
== AT_FDCWD
? RUN_AS_MKDIR_RECURSIVE
: RUN_AS_MKDIRAT_RECURSIVE
,
1702 &data
, &run_as_ret
, uid
, gid
);
1703 errno
= run_as_ret
._errno
;
1704 ret
= run_as_ret
.u
.ret
;
1710 int run_as_mkdir(const char *path
, mode_t mode
, uid_t uid
, gid_t gid
)
1712 return run_as_mkdirat(AT_FDCWD
, path
, mode
, uid
, gid
);
1716 int run_as_mkdirat(int dirfd
, const char *path
, mode_t mode
,
1717 uid_t uid
, gid_t gid
)
1720 struct run_as_data data
= {};
1721 struct run_as_ret run_as_ret
= {};
1723 DBG3("mkdirat() recursive fd = %d%s, path = %s, mode = %d, uid = %d, gid = %d",
1724 dirfd
, dirfd
== AT_FDCWD
? " (AT_FDCWD)" : "",
1725 path
, (int) mode
, (int) uid
, (int) gid
);
1726 ret
= lttng_strncpy(data
.u
.mkdir
.path
, path
,
1727 sizeof(data
.u
.mkdir
.path
));
1729 ERR("Failed to copy path argument of mkdirat command");
1732 data
.u
.mkdir
.path
[sizeof(data
.u
.mkdir
.path
) - 1] = '\0';
1733 data
.u
.mkdir
.mode
= mode
;
1734 data
.u
.mkdir
.dirfd
= dirfd
;
1735 run_as(dirfd
== AT_FDCWD
? RUN_AS_MKDIR
: RUN_AS_MKDIRAT
,
1736 &data
, &run_as_ret
, uid
, gid
);
1737 errno
= run_as_ret
._errno
;
1738 ret
= run_as_ret
.u
.ret
;
1744 int run_as_open(const char *path
, int flags
, mode_t mode
, uid_t uid
,
1747 return run_as_openat(AT_FDCWD
, path
, flags
, mode
, uid
, gid
);
1751 int run_as_openat(int dirfd
, const char *path
, int flags
, mode_t mode
,
1752 uid_t uid
, gid_t gid
)
1755 struct run_as_data data
= {};
1756 struct run_as_ret run_as_ret
= {};
1758 DBG3("openat() fd = %d%s, path = %s, flags = %X, mode = %d, uid %d, gid %d",
1759 dirfd
, dirfd
== AT_FDCWD
? " (AT_FDCWD)" : "",
1760 path
, flags
, (int) mode
, (int) uid
, (int) gid
);
1761 ret
= lttng_strncpy(data
.u
.open
.path
, path
, sizeof(data
.u
.open
.path
));
1763 ERR("Failed to copy path argument of open command");
1766 data
.u
.open
.flags
= flags
;
1767 data
.u
.open
.mode
= mode
;
1768 data
.u
.open
.dirfd
= dirfd
;
1769 run_as(dirfd
== AT_FDCWD
? RUN_AS_OPEN
: RUN_AS_OPENAT
,
1770 &data
, &run_as_ret
, uid
, gid
);
1771 errno
= run_as_ret
._errno
;
1772 ret
= run_as_ret
.u
.ret
< 0 ? run_as_ret
.u
.ret
:
1773 run_as_ret
.u
.open
.fd
;
1779 int run_as_unlink(const char *path
, uid_t uid
, gid_t gid
)
1781 return run_as_unlinkat(AT_FDCWD
, path
, uid
, gid
);
1785 int run_as_unlinkat(int dirfd
, const char *path
, uid_t uid
, gid_t gid
)
1788 struct run_as_data data
= {};
1789 struct run_as_ret run_as_ret
= {};
1791 DBG3("unlinkat() fd = %d%s, path = %s, uid = %d, gid = %d",
1792 dirfd
, dirfd
== AT_FDCWD
? " (AT_FDCWD)" : "",
1793 path
, (int) uid
, (int) gid
);
1794 ret
= lttng_strncpy(data
.u
.unlink
.path
, path
,
1795 sizeof(data
.u
.unlink
.path
));
1799 data
.u
.unlink
.dirfd
= dirfd
;
1800 run_as(dirfd
== AT_FDCWD
? RUN_AS_UNLINK
: RUN_AS_UNLINKAT
, &data
,
1801 &run_as_ret
, uid
, gid
);
1802 errno
= run_as_ret
._errno
;
1803 ret
= run_as_ret
.u
.ret
;
1809 int run_as_rmdir(const char *path
, uid_t uid
, gid_t gid
)
1811 return run_as_rmdirat(AT_FDCWD
, path
, uid
, gid
);
1815 int run_as_rmdirat(int dirfd
, const char *path
, uid_t uid
, gid_t gid
)
1818 struct run_as_data data
= {};
1819 struct run_as_ret run_as_ret
= {};
1821 DBG3("rmdirat() fd = %d%s, path = %s, uid = %d, gid = %d",
1822 dirfd
, dirfd
== AT_FDCWD
? " (AT_FDCWD)" : "",
1823 path
, (int) uid
, (int) gid
);
1824 ret
= lttng_strncpy(data
.u
.rmdir
.path
, path
,
1825 sizeof(data
.u
.rmdir
.path
));
1829 data
.u
.rmdir
.dirfd
= dirfd
;
1830 run_as(dirfd
== AT_FDCWD
? RUN_AS_RMDIR
: RUN_AS_RMDIRAT
, &data
,
1831 &run_as_ret
, uid
, gid
);
1832 errno
= run_as_ret
._errno
;
1833 ret
= run_as_ret
.u
.ret
;
1839 int run_as_rmdir_recursive(const char *path
, uid_t uid
, gid_t gid
, int flags
)
1841 return run_as_rmdirat_recursive(AT_FDCWD
, path
, uid
, gid
, flags
);
1845 int run_as_rmdirat_recursive(int dirfd
, const char *path
, uid_t uid
, gid_t gid
, int flags
)
1848 struct run_as_data data
= {};
1849 struct run_as_ret run_as_ret
= {};
1851 DBG3("rmdirat() recursive fd = %d%s, path = %s, uid = %d, gid = %d",
1852 dirfd
, dirfd
== AT_FDCWD
? " (AT_FDCWD)" : "",
1853 path
, (int) uid
, (int) gid
);
1854 ret
= lttng_strncpy(data
.u
.rmdir
.path
, path
,
1855 sizeof(data
.u
.rmdir
.path
));
1859 data
.u
.rmdir
.dirfd
= dirfd
;
1860 data
.u
.rmdir
.flags
= flags
;
1861 run_as(dirfd
== AT_FDCWD
? RUN_AS_RMDIR_RECURSIVE
: RUN_AS_RMDIRAT_RECURSIVE
,
1862 &data
, &run_as_ret
, uid
, gid
);
1863 errno
= run_as_ret
._errno
;
1864 ret
= run_as_ret
.u
.ret
;
1870 int run_as_rename(const char *old
, const char *new, uid_t uid
, gid_t gid
)
1872 return run_as_renameat(AT_FDCWD
, old
, AT_FDCWD
, new, uid
, gid
);
1876 int run_as_renameat(int old_dirfd
, const char *old_name
,
1877 int new_dirfd
, const char *new_name
, uid_t uid
, gid_t gid
)
1880 struct run_as_data data
= {};
1881 struct run_as_ret run_as_ret
= {};
1883 DBG3("renameat() old_dirfd = %d%s, old_name = %s, new_dirfd = %d%s, new_name = %s, uid = %d, gid = %d",
1884 old_dirfd
, old_dirfd
== AT_FDCWD
? " (AT_FDCWD)" : "",
1886 new_dirfd
, new_dirfd
== AT_FDCWD
? " (AT_FDCWD)" : "",
1887 new_name
, (int) uid
, (int) gid
);
1888 ret
= lttng_strncpy(data
.u
.rename
.old_path
, old_name
,
1889 sizeof(data
.u
.rename
.old_path
));
1893 ret
= lttng_strncpy(data
.u
.rename
.new_path
, new_name
,
1894 sizeof(data
.u
.rename
.new_path
));
1899 data
.u
.rename
.dirfds
[0] = old_dirfd
;
1900 data
.u
.rename
.dirfds
[1] = new_dirfd
;
1901 run_as(old_dirfd
== AT_FDCWD
&& new_dirfd
== AT_FDCWD
?
1902 RUN_AS_RENAME
: RUN_AS_RENAMEAT
,
1903 &data
, &run_as_ret
, uid
, gid
);
1904 errno
= run_as_ret
._errno
;
1905 ret
= run_as_ret
.u
.ret
;
1911 int run_as_extract_elf_symbol_offset(int fd
, const char* function
,
1912 uid_t uid
, gid_t gid
, uint64_t *offset
)
1915 struct run_as_data data
= {};
1916 struct run_as_ret run_as_ret
= {};
1918 DBG3("extract_elf_symbol_offset() on fd=%d and function=%s "
1919 "with for uid %d and gid %d", fd
, function
,
1920 (int) uid
, (int) gid
);
1922 data
.u
.extract_elf_symbol_offset
.fd
= fd
;
1924 strncpy(data
.u
.extract_elf_symbol_offset
.function
, function
, LTTNG_SYMBOL_NAME_LEN
- 1);
1925 data
.u
.extract_elf_symbol_offset
.function
[LTTNG_SYMBOL_NAME_LEN
- 1] = '\0';
1926 ret
= lttng_strncpy(data
.u
.extract_elf_symbol_offset
.function
,
1928 sizeof(data
.u
.extract_elf_symbol_offset
.function
));
1933 run_as(RUN_AS_EXTRACT_ELF_SYMBOL_OFFSET
, &data
, &run_as_ret
, uid
, gid
);
1934 errno
= run_as_ret
._errno
;
1935 if (run_as_ret
._error
) {
1940 *offset
= run_as_ret
.u
.extract_elf_symbol_offset
.offset
;
1946 int run_as_extract_sdt_probe_offsets(int fd
, const char* provider_name
,
1947 const char* probe_name
, uid_t uid
, gid_t gid
,
1948 uint64_t **offsets
, uint32_t *num_offset
)
1951 struct run_as_data data
= {};
1952 struct run_as_ret run_as_ret
= {};
1954 DBG3("extract_sdt_probe_offsets() on fd=%d, probe_name=%s and "
1955 "provider_name=%s with for uid %d and gid %d", fd
,
1956 probe_name
, provider_name
, (int) uid
, (int) gid
);
1958 data
.u
.extract_sdt_probe_offsets
.fd
= fd
;
1960 ret
= lttng_strncpy(data
.u
.extract_sdt_probe_offsets
.probe_name
, probe_name
,
1961 sizeof(data
.u
.extract_sdt_probe_offsets
.probe_name
));
1965 ret
= lttng_strncpy(data
.u
.extract_sdt_probe_offsets
.provider_name
,
1967 sizeof(data
.u
.extract_sdt_probe_offsets
.provider_name
));
1972 run_as(RUN_AS_EXTRACT_SDT_PROBE_OFFSETS
, &data
, &run_as_ret
, uid
, gid
);
1973 errno
= run_as_ret
._errno
;
1974 if (run_as_ret
._error
) {
1979 *num_offset
= run_as_ret
.u
.extract_sdt_probe_offsets
.num_offset
;
1980 *offsets
= zmalloc(*num_offset
* sizeof(uint64_t));
1986 memcpy(*offsets
, run_as_ret
.u
.extract_sdt_probe_offsets
.offsets
,
1987 *num_offset
* sizeof(uint64_t));
1993 int run_as_generate_filter_bytecode(const char *filter_expression
,
1994 const struct lttng_credentials
*creds
,
1995 struct lttng_bytecode
**bytecode
)
1998 struct run_as_data data
= {};
1999 struct run_as_ret run_as_ret
= {};
2000 const struct lttng_bytecode
*view_bytecode
= NULL
;
2001 struct lttng_bytecode
*local_bytecode
= NULL
;
2002 const uid_t uid
= lttng_credentials_get_uid(creds
);
2003 const gid_t gid
= lttng_credentials_get_gid(creds
);
2005 DBG3("generate_filter_bytecode() from expression=\"%s\" for uid %d and gid %d",
2006 filter_expression
, (int) uid
, (int) gid
);
2008 ret
= lttng_strncpy(data
.u
.generate_filter_bytecode
.filter_expression
, filter_expression
,
2009 sizeof(data
.u
.generate_filter_bytecode
.filter_expression
));
2014 run_as(RUN_AS_GENERATE_FILTER_BYTECODE
, &data
, &run_as_ret
, uid
, gid
);
2015 errno
= run_as_ret
._errno
;
2016 if (run_as_ret
._error
) {
2021 view_bytecode
= (const struct lttng_bytecode
*) run_as_ret
.u
.generate_filter_bytecode
.bytecode
;
2023 local_bytecode
= zmalloc(sizeof(*local_bytecode
) + view_bytecode
->len
);
2024 if (!local_bytecode
) {
2029 memcpy(local_bytecode
, run_as_ret
.u
.generate_filter_bytecode
.bytecode
,
2030 sizeof(*local_bytecode
) + view_bytecode
->len
);
2031 *bytecode
= local_bytecode
;
2037 int run_as_create_worker(const char *procname
,
2038 post_fork_cleanup_cb clean_up_func
,
2039 void *clean_up_user_data
)
2043 pthread_mutex_lock(&worker_lock
);
2044 ret
= run_as_create_worker_no_lock(procname
, clean_up_func
,
2045 clean_up_user_data
);
2046 pthread_mutex_unlock(&worker_lock
);
2051 void run_as_destroy_worker(void)
2053 pthread_mutex_lock(&worker_lock
);
2054 run_as_destroy_worker_no_lock();
2055 pthread_mutex_unlock(&worker_lock
);