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hurd: Use the new file_exec_paths RPC

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From: Emilio Pozuelo Monfort <pochu27@gmail.com>
From: Svante Signell <svante.signell@gmail.com>

Pass the file paths of executable to the exec server, both relative and
absolute, which exec needs to properly execute and avertise #!-scripts.
Previously, the exec server tried to guess the name from argv[0] but argv[0]
only contains the executable name by convention.

	* hurd/hurdexec.c (_hurd_exec): Deprecate function.
	(_hurd_exec_paths): New function.
	* hurd/hurd.h (_hurd_exec): Deprecate function.
	(_hurd_exec_paths): Declare function.
	* hurd/Versions: Export _hurd_exec_paths.
	* sysdeps/mach/hurd/execve.c: Include <stdlib.h> and <stdio.h>
	(__execve): Use __getcwd to build absolute path, and use
	_hurd_exec_paths instead of _hurd_exec.
	* sysdeps/mach/hurd/spawni.c: Likewise.
	* sysdeps/mach/hurd/fexecve.c: Use _hurd_exec_paths instead of
	_hurd_exec.
This commit is contained in:
Samuel Thibault 2018-01-09 01:36:58 +01:00
parent d7ff3f11b6
commit 311ba8dc44
7 changed files with 167 additions and 32 deletions
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15
ChangeLog
View File

@ -1,3 +1,18 @@
2010-08-04 Emilio Pozuelo Monfort <pochu27@gmail.com>
2017-09-26 Svante Signell <svante.signell@gmail.com>
* hurd/hurdexec.c (_hurd_exec): Deprecate function.
(_hurd_exec_paths): New function.
* hurd/hurd.h (_hurd_exec): Deprecate function.
(_hurd_exec_paths): Declare function.
* hurd/Versions: Export _hurd_exec_paths.
* sysdeps/mach/hurd/execve.c: Include <stdlib.h> and <stdio.h>
(__execve): Use __getcwd to build absolute path, and use
_hurd_exec_paths instead of _hurd_exec.
* sysdeps/mach/hurd/spawni.c: Likewise.
* sysdeps/mach/hurd/fexecve.c: Use _hurd_exec_paths instead of
_hurd_exec.
2018-01-08 Dmitry V. Levin <ldv@altlinux.org>
* sysdeps/unix/sysv/linux/tst-ttyname.c (do_in_chroot_1): Skip the

4
hurd/Versions
View File

@ -129,6 +129,10 @@ libc {
# functions used in macros & inline functions
__errno_location;
}
GLIBC_2.27 {
# "quasi-internal" functions
_hurd_exec_paths;
}
HURD_CTHREADS_0.3 {
# weak refs to libthreads functions that libc calls iff libthreads in use

13
hurd/hurd.h
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@ -240,12 +240,21 @@ extern FILE *fopenport (io_t port, const char *mode);
extern FILE *__fopenport (io_t port, const char *mode);
/* Execute a file, replacing TASK's current program image. */
/* Deprecated: use _hurd_exec_paths instead. */
extern error_t _hurd_exec (task_t task,
file_t file,
char *const argv[],
char *const envp[]);
char *const envp[]) __attribute_deprecated__;
/* Execute a file, replacing TASK's current program image. */
extern error_t _hurd_exec_paths (task_t task,
file_t file,
const char *path,
const char *abspath,
char *const argv[],
char *const envp[]);
/* Inform the proc server we have exited with STATUS, and kill the

52
hurd/hurdexec.c
View File

@ -30,10 +30,29 @@
/* Overlay TASK, executing FILE with arguments ARGV and environment ENVP.
If TASK == mach_task_self (), some ports are dealloc'd by the exec server.
ARGV and ENVP are terminated by NULL pointers. */
ARGV and ENVP are terminated by NULL pointers.
Deprecated: use _hurd_exec_paths instead. */
error_t
_hurd_exec (task_t task, file_t file,
char *const argv[], char *const envp[])
{
return _hurd_exec_paths (task, file, NULL, NULL, argv, envp);
}
link_warning (_hurd_exec,
"_hurd_exec is deprecated, use _hurd_exec_paths instead");
/* Overlay TASK, executing FILE with arguments ARGV and environment ENVP.
If TASK == mach_task_self (), some ports are dealloc'd by the exec server.
ARGV and ENVP are terminated by NULL pointers. PATH is the relative path to
FILE and ABSPATH is the absolute path to FILE. Passing NULL, though possible,
should be avoided, since then the exec server may not know the path to
FILE if FILE is a script, and will then pass /dev/fd/N to the
interpreter. */
error_t
_hurd_exec_paths (task_t task, file_t file,
const char *path, const char *abspath,
char *const argv[], char *const envp[])
{
error_t err;
char *args, *env;
@ -216,7 +235,7 @@ _hurd_exec (task_t task, file_t file,
/* We have euid != svuid or egid != svgid. POSIX.1 says that exec
sets svuid = euid and svgid = egid. So we must get a new auth
port and reauthenticate everything with it. We'll pass the new
ports in file_exec instead of our own ports. */
ports in file_exec_paths instead of our own ports. */
auth_t newauth;
@ -360,13 +379,28 @@ _hurd_exec (task_t task, file_t file,
if (__sigismember (&_hurdsig_traced, SIGKILL))
flags |= EXEC_SIGTRAP;
#endif
err = __file_exec (file, task, flags,
args, argslen, env, envlen,
dtable, MACH_MSG_TYPE_COPY_SEND, dtablesize,
ports, MACH_MSG_TYPE_COPY_SEND, _hurd_nports,
ints, INIT_INT_MAX,
please_dealloc, pdp - please_dealloc,
&_hurd_msgport, task == __mach_task_self () ? 1 : 0);
err = __file_exec_paths (file, task, flags,
path ? path : "",
abspath ? abspath : "",
args, argslen, env, envlen,
dtable, MACH_MSG_TYPE_COPY_SEND, dtablesize,
ports, MACH_MSG_TYPE_COPY_SEND,
_hurd_nports,
ints, INIT_INT_MAX,
please_dealloc, pdp - please_dealloc,
&_hurd_msgport,
task == __mach_task_self () ? 1 : 0);
/* Fall back for backwards compatibility. This can just be removed
when __file_exec goes away. */
if (err == MIG_BAD_ID)
err = __file_exec (file, task, flags,
args, argslen, env, envlen,
dtable, MACH_MSG_TYPE_COPY_SEND, dtablesize,
ports, MACH_MSG_TYPE_COPY_SEND, _hurd_nports,
ints, INIT_INT_MAX,
please_dealloc, pdp - please_dealloc,
&_hurd_msgport,
task == __mach_task_self () ? 1 : 0);
}
/* Release references to the standard ports. */

36
sysdeps/mach/hurd/execve.c
View File

@ -18,6 +18,8 @@
#include <unistd.h>
#include <hurd.h>
#include <fcntl.h>
#include <stdlib.h>
#include <stdio.h>
/* Replace the current process, executing FILE_NAME with arguments ARGV and
environment ENVP. ARGV and ENVP are terminated by NULL pointers. */
@ -25,16 +27,46 @@ int
__execve (const char *file_name, char *const argv[], char *const envp[])
{
error_t err;
file_t file = __file_name_lookup (file_name, O_EXEC, 0);
char *concat_name = NULL;
const char *abs_path;
file_t file = __file_name_lookup (file_name, O_EXEC, 0);
if (file == MACH_PORT_NULL)
return -1;
if (file_name[0] == '/')
{
/* Already an absolute path */
abs_path = file_name;
}
else
{
/* Relative path */
char *cwd = __getcwd (NULL, 0);
if (cwd == NULL)
{
__mach_port_deallocate (__mach_task_self (), file);
return -1;
}
int res = __asprintf (&concat_name, "%s/%s", cwd, file_name);
free (cwd);
if (res == -1)
{
__mach_port_deallocate (__mach_task_self (), file);
return -1;
}
abs_path = concat_name;
}
/* Hopefully this will not return. */
err = _hurd_exec (__mach_task_self (), file, argv, envp);
err = _hurd_exec_paths (__mach_task_self (), file,
file_name, abs_path, argv, envp);
/* Oh well. Might as well be tidy. */
__mach_port_deallocate (__mach_task_self (), file);
free (concat_name);
return __hurd_fail (err);
}

5
sysdeps/mach/hurd/fexecve.c
View File

@ -25,8 +25,9 @@
int
fexecve (int fd, char *const argv[], char *const envp[])
{
error_t err = HURD_DPORT_USE (fd, _hurd_exec (__mach_task_self (), port,
argv, envp));
error_t err = HURD_DPORT_USE (fd, _hurd_exec_paths (__mach_task_self (),
port, NULL, NULL,
argv, envp));
if (! err)
err = EGRATUITOUS;
return __hurd_fail (err);

74
sysdeps/mach/hurd/spawni.c
View File

@ -22,6 +22,7 @@
#include <spawn.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <unistd.h>
#include <hurd.h>
#include <hurd/signal.h>
@ -44,6 +45,8 @@ __spawni (pid_t *pid, const char *file,
{
pid_t new_pid;
char *path, *p, *name;
char *concat_name = NULL, *relpath, *abspath;
int res;
size_t len;
size_t pathlen;
short int flags;
@ -59,14 +62,14 @@ __spawni (pid_t *pid, const char *file,
that remains visible after an exec is registration with the proc
server, and the inheritance of various values and ports. All those
inherited values and ports are what get collected up and passed in the
file_exec RPC by an exec call. So we do the proc server registration
here, following the model of fork (see fork.c). We then collect up
the inherited values and ports from this (parent) process following
the model of exec (see hurd/hurdexec.c), modify or replace each value
that fork would (plus the specific changes demanded by ATTRP and
FILE_ACTIONS), and make the file_exec RPC on the requested executable
file with the child process's task port rather than our own. This
should be indistinguishable from the fork + exec implementation,
file_exec_paths RPC by an exec call. So we do the proc server
registration here, following the model of fork (see fork.c). We then
collect up the inherited values and ports from this (parent) process
following the model of exec (see hurd/hurdexec.c), modify or replace each
value that fork would (plus the specific changes demanded by ATTRP and
FILE_ACTIONS), and make the file_exec_paths RPC on the requested
executable file with the child process's task port rather than our own.
This should be indistinguishable from the fork + exec implementation,
except that all errors will be detected here (in the parent process)
and return proper errno codes rather than the child dying with 127.
@ -547,7 +550,7 @@ __spawni (pid_t *pid, const char *file,
if ((xflags & SPAWN_XFLAGS_USE_PATH) == 0 || strchr (file, '/') != NULL)
/* The FILE parameter is actually a path. */
err = child_lookup (file, O_EXEC, 0, &execfile);
err = child_lookup (relpath = file, O_EXEC, 0, &execfile);
else
{
/* We have to search for FILE on the path. */
@ -608,6 +611,7 @@ __spawni (pid_t *pid, const char *file,
}
// We only get here when we are done looking for the file.
relpath = startp;
break;
}
while (*p++ != '\0');
@ -615,6 +619,26 @@ __spawni (pid_t *pid, const char *file,
if (err)
goto out;
if (relpath[0] == '/')
{
/* Already an absolute path */
abspath = relpath;
}
else
{
/* Relative path */
char *cwd = __getcwd (NULL, 0);
if (cwd == NULL)
goto out;
res = __asprintf (&concat_name, "%s/%s", cwd, relpath);
free (cwd);
if (res == -1)
goto out;
abspath = concat_name;
}
/* Almost there! */
{
mach_port_t ports[_hurd_nports];
@ -624,14 +648,28 @@ __spawni (pid_t *pid, const char *file,
inline error_t exec (file_t file)
{
return __file_exec (file, task,
(__sigismember (&_hurdsig_traced, SIGKILL)
? EXEC_SIGTRAP : 0),
args, argslen, env, envlen,
dtable, MACH_MSG_TYPE_COPY_SEND, dtablesize,
ports, MACH_MSG_TYPE_COPY_SEND, _hurd_nports,
ints, INIT_INT_MAX,
NULL, 0, NULL, 0);
error_t err = __file_exec_paths
(file, task,
__sigismember (&_hurdsig_traced, SIGKILL) ? EXEC_SIGTRAP : 0,
relpath, abspath, args, argslen, env, envlen,
dtable, MACH_MSG_TYPE_COPY_SEND, dtablesize,
ports, MACH_MSG_TYPE_COPY_SEND, _hurd_nports,
ints, INIT_INT_MAX,
NULL, 0, NULL, 0);
/* Fallback for backwards compatibility. This can just be removed
when __file_exec goes away. */
if (err == MIG_BAD_ID)
return __file_exec (file, task,
(__sigismember (&_hurdsig_traced, SIGKILL)
? EXEC_SIGTRAP : 0),
args, argslen, env, envlen,
dtable, MACH_MSG_TYPE_COPY_SEND, dtablesize,
ports, MACH_MSG_TYPE_COPY_SEND, _hurd_nports,
ints, INIT_INT_MAX,
NULL, 0, NULL, 0);
return err;
}
/* Now we are out of things that can fail before the file_exec RPC,
@ -750,6 +788,8 @@ __spawni (pid_t *pid, const char *file,
_hurd_port_free (dtable_cells[i], &ulink_dtable[i], dtable[i]);
}
free (concat_name);
if (err)
/* This hack canonicalizes the error code that we return. */
err = (__hurd_fail (err), errno);