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hurd: Add __rtld_execve
It trivially execs with the same dtable, portarray and intarray, and only has to take care of deallocating / destroying ports (file, notably).
This commit is contained in:
Samuel Thibault
parent
84a9d5835a
commit
54dda2cdba
19
sysdeps/mach/hurd/dl-execve.h
Normal file
19
sysdeps/mach/hurd/dl-execve.h
Normal file
@ -0,0 +1,19 @@
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/* execve for the dynamic linker. Hurd version.
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Copyright (C) 2021 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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extern int __rtld_execve (const char *path, char *const *argv, char *const *envp);
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@ -30,6 +30,7 @@
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#include <sys/wait.h>
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#include <assert.h>
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#include <sysdep.h>
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#include <argz.h>
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#include <mach/mig_support.h>
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#include <mach/machine/vm_param.h>
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#include "hurdstartup.h"
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@ -291,7 +292,8 @@ open_file (const char *file_name, int flags,
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return MACH_PORT_NULL;
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}
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assert (!(flags & ~(O_READ | O_CLOEXEC)));
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assert (!(flags & ~(O_READ | O_EXEC | O_CLOEXEC)));
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flags &= ~O_CLOEXEC;
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startdir = _dl_hurd_data->portarray[file_name[0] == '/'
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? INIT_PORT_CRDIR : INIT_PORT_CWDIR];
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@ -299,7 +301,7 @@ open_file (const char *file_name, int flags,
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while (file_name[0] == '/')
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file_name++;
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err = __dir_lookup (startdir, (char *)file_name, O_RDONLY, 0,
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err = __dir_lookup (startdir, (char *)file_name, flags, 0,
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&doretry, retryname, port);
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if (!err)
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@ -558,6 +560,109 @@ __access_noerrno (const char *file, int type)
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return -1;
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}
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int
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__rtld_execve (const char *file_name, char *const argv[],
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char *const envp[])
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{
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file_t file;
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error_t err;
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char *args, *env;
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size_t argslen, envlen;
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mach_port_t *ports = _dl_hurd_data->portarray;
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unsigned int portarraysize = _dl_hurd_data->portarraysize;
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file_t *dtable = _dl_hurd_data->dtable;
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unsigned int dtablesize = _dl_hurd_data->dtablesize;
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int *intarray = _dl_hurd_data->intarray;
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unsigned int i, j;
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mach_port_t *please_dealloc, *pdp;
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mach_port_t *portnames = NULL;
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mach_msg_type_number_t nportnames = 0;
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mach_port_type_t *porttypes = NULL;
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mach_msg_type_number_t nporttypes = 0;
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int flags;
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err = open_file (file_name, O_EXEC, &file, NULL);
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if (err)
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goto out;
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if (argv == NULL)
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args = NULL, argslen = 0;
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else if (err = __argz_create (argv, &args, &argslen))
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goto outfile;
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if (envp == NULL)
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env = NULL, envlen = 0;
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else if (err = __argz_create (envp, &env, &envlen))
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goto outargs;
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please_dealloc = __alloca ((portarraysize + dtablesize)
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* sizeof (mach_port_t));
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pdp = please_dealloc;
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/* Get all ports that we may not know about and we should thus destroy. */
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err = __mach_port_names (__mach_task_self (),
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&portnames, &nportnames,
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&porttypes, &nporttypes);
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if (err)
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goto outenv;
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if (nportnames != nporttypes)
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{
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err = EGRATUITOUS;
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goto outenv;
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}
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for (i = 0; i < portarraysize; ++i)
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{
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*pdp++ = ports[i];
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for (j = 0; j < nportnames; j++)
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if (portnames[j] == ports[i])
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portnames[j] = MACH_PORT_NULL;
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}
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for (i = 0; i < dtablesize; ++i)
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{
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*pdp++ = dtable[i];
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for (j = 0; j < nportnames; j++)
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if (portnames[j] == dtable[i])
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portnames[j] = MACH_PORT_NULL;
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}
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/* Pack ports to be destroyed together. */
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for (i = 0, j = 0; i < nportnames; i++)
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{
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if (portnames[i] == MACH_PORT_NULL)
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continue;
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if (j != i)
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portnames[j] = portnames[i];
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j++;
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}
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nportnames = j;
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flags = 0;
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#ifdef EXEC_SIGTRAP
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if (__sigismember (&intarray[INIT_TRACEMASK], SIGKILL))
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flags |= EXEC_SIGTRAP;
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#endif
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err = __file_exec_paths (file, __mach_task_self (), flags,
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file_name, file_name[0] == '/' ? file_name : "",
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args, argslen,
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env, envlen,
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dtable, MACH_MSG_TYPE_COPY_SEND, dtablesize,
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ports, MACH_MSG_TYPE_COPY_SEND, portarraysize,
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intarray, INIT_INT_MAX,
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please_dealloc, pdp - please_dealloc,
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portnames, nportnames);
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/* Oh well. Might as well be tidy. */
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outenv:
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free (env);
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outargs:
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free (args);
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outfile:
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__mach_port_deallocate (__mach_task_self (), file);
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out:
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return err;
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}
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check_no_hidden(__getpid);
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pid_t weak_function
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__getpid (void)
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