version 1.1.1.3, 2012/10/09 09:29:52
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version 1.1.1.4, 2013/07/22 10:46:13
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/* |
/* |
* Copyright (c) 2009-2012 Todd C. Miller <Todd.Miller@courtesan.com> | * Copyright (c) 2009-2013 Todd C. Miller <Todd.Miller@courtesan.com> |
* |
* |
* Permission to use, copy, modify, and distribute this software for any |
* Permission to use, copy, modify, and distribute this software for any |
* purpose with or without fee is hereby granted, provided that the above |
* purpose with or without fee is hereby granted, provided that the above |
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#include <config.h> |
#include <config.h> |
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#include <sys/types.h> |
#include <sys/types.h> |
#include <sys/param.h> |
|
#ifdef HAVE_SYS_SYSMACROS_H |
#ifdef HAVE_SYS_SYSMACROS_H |
# include <sys/sysmacros.h> |
# include <sys/sysmacros.h> |
#endif |
#endif |
Line 50
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Line 49
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#if TIME_WITH_SYS_TIME |
#if TIME_WITH_SYS_TIME |
# include <time.h> |
# include <time.h> |
#endif |
#endif |
#ifdef HAVE_SETLOCALE |
|
# include <locale.h> |
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#endif |
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#include <errno.h> |
#include <errno.h> |
#include <fcntl.h> |
#include <fcntl.h> |
#include <signal.h> |
#include <signal.h> |
Line 63
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Line 59
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#include "sudo_plugin.h" |
#include "sudo_plugin.h" |
#include "sudo_plugin_int.h" |
#include "sudo_plugin_int.h" |
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/* Shared with exec_pty.c for use with handler(). */ |
|
int signal_pipe[2]; |
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/* We keep a tailq of signals to forward to child. */ |
/* We keep a tailq of signals to forward to child. */ |
struct sigforward { |
struct sigforward { |
struct sigforward *prev, *next; |
struct sigforward *prev, *next; |
Line 77 static pid_t ppgrp = -1;
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Line 70 static pid_t ppgrp = -1;
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volatile pid_t cmnd_pid = -1; |
volatile pid_t cmnd_pid = -1; |
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static int handle_signals(int sv[2], pid_t child, int log_io, | static int dispatch_signals(int sv[2], pid_t child, int log_io, |
struct command_status *cstat); |
struct command_status *cstat); |
|
static int dispatch_pending_signals(struct command_status *cstat); |
static void forward_signals(int fd); |
static void forward_signals(int fd); |
static void schedule_signal(int signo); |
static void schedule_signal(int signo); |
#ifdef SA_SIGINFO |
#ifdef SA_SIGINFO |
Line 110 static int fork_cmnd(struct command_details *details,
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Line 104 static int fork_cmnd(struct command_details *details,
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* XXX - currently we send SIGCONT upon resume in some cases where |
* XXX - currently we send SIGCONT upon resume in some cases where |
* we don't need to (e.g. command pgrp == parent pgrp). |
* we don't need to (e.g. command pgrp == parent pgrp). |
*/ |
*/ |
zero_bytes(&sa, sizeof(sa)); | memset(&sa, 0, sizeof(sa)); |
sigemptyset(&sa.sa_mask); | sigfillset(&sa.sa_mask); |
sa.sa_flags = SA_INTERRUPT; /* do not restart syscalls */ |
sa.sa_flags = SA_INTERRUPT; /* do not restart syscalls */ |
#ifdef SA_SIGINFO |
#ifdef SA_SIGINFO |
sa.sa_flags |= SA_SIGINFO; |
sa.sa_flags |= SA_SIGINFO; |
Line 119 static int fork_cmnd(struct command_details *details,
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Line 113 static int fork_cmnd(struct command_details *details,
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#else |
#else |
sa.sa_handler = handler; |
sa.sa_handler = handler; |
#endif |
#endif |
sigaction(SIGCONT, &sa, NULL); | sudo_sigaction(SIGCONT, &sa, NULL); |
#ifdef SA_SIGINFO |
#ifdef SA_SIGINFO |
sa.sa_sigaction = handler_user_only; |
sa.sa_sigaction = handler_user_only; |
#endif |
#endif |
sigaction(SIGTSTP, &sa, NULL); | sudo_sigaction(SIGTSTP, &sa, NULL); |
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/* |
/* |
* The policy plugin's session init must be run before we fork |
* The policy plugin's session init must be run before we fork |
* or certain pam modules won't be able to track their state. |
* or certain pam modules won't be able to track their state. |
*/ |
*/ |
if (policy_init_session(details) != true) |
if (policy_init_session(details) != true) |
errorx(1, _("policy plugin failed session initialization")); | fatalx(_("policy plugin failed session initialization")); |
|
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cmnd_pid = sudo_debug_fork(); |
cmnd_pid = sudo_debug_fork(); |
switch (cmnd_pid) { |
switch (cmnd_pid) { |
case -1: |
case -1: |
error(1, _("unable to fork")); | fatal(_("unable to fork")); |
break; |
break; |
case 0: |
case 0: |
/* child */ |
/* child */ |
Line 143 static int fork_cmnd(struct command_details *details,
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Line 137 static int fork_cmnd(struct command_details *details,
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close(signal_pipe[0]); |
close(signal_pipe[0]); |
close(signal_pipe[1]); |
close(signal_pipe[1]); |
fcntl(sv[1], F_SETFD, FD_CLOEXEC); |
fcntl(sv[1], F_SETFD, FD_CLOEXEC); |
restore_signals(); | exec_cmnd(details, &cstat, &sv[1]); |
if (exec_setup(details, NULL, -1) == true) { | |
/* headed for execve() */ | |
sudo_debug_execve(SUDO_DEBUG_INFO, details->command, | |
details->argv, details->envp); | |
if (details->closefrom >= 0) { | |
int maxfd = details->closefrom; | |
dup2(sv[1], maxfd); | |
(void)fcntl(maxfd, F_SETFD, FD_CLOEXEC); | |
sv[1] = maxfd++; | |
if (sudo_debug_fd_set(maxfd) != -1) | |
maxfd++; | |
closefrom(maxfd); | |
} | |
#ifdef HAVE_SELINUX | |
if (ISSET(details->flags, CD_RBAC_ENABLED)) { | |
selinux_execve(details->command, details->argv, details->envp, | |
ISSET(details->flags, CD_NOEXEC)); | |
} else | |
#endif | |
{ | |
sudo_execve(details->command, details->argv, details->envp, | |
ISSET(details->flags, CD_NOEXEC)); | |
} | |
sudo_debug_printf(SUDO_DEBUG_ERROR, "unable to exec %s: %s", | |
details->command, strerror(errno)); | |
} | |
cstat.type = CMD_ERRNO; | |
cstat.val = errno; | |
send(sv[1], &cstat, sizeof(cstat), 0); |
send(sv[1], &cstat, sizeof(cstat), 0); |
sudo_debug_exit_int(__func__, __FILE__, __LINE__, sudo_debug_subsys, 1); |
sudo_debug_exit_int(__func__, __FILE__, __LINE__, sudo_debug_subsys, 1); |
_exit(1); |
_exit(1); |
Line 181 static int fork_cmnd(struct command_details *details,
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Line 147 static int fork_cmnd(struct command_details *details,
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debug_return_int(cmnd_pid); |
debug_return_int(cmnd_pid); |
} |
} |
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static struct signal_state { |
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int signo; |
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sigaction_t sa; |
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} saved_signals[] = { |
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{ SIGALRM }, |
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{ SIGCHLD }, |
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{ SIGCONT }, |
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{ SIGHUP }, |
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{ SIGINT }, |
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{ SIGPIPE }, |
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{ SIGQUIT }, |
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{ SIGTERM }, |
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{ SIGTSTP }, |
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{ SIGTTIN }, |
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{ SIGTTOU }, |
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{ SIGUSR1 }, |
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{ SIGUSR2 }, |
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{ -1 } |
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}; |
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/* |
/* |
* Save signal handler state so it can be restored before exec. | * Setup the execution environment and execute the command. |
| * If SELinux is enabled, run the command via sesh, otherwise |
| * execute it directly. |
| * If the exec fails, cstat is filled in with the value of errno. |
*/ |
*/ |
void |
void |
save_signals(void) | exec_cmnd(struct command_details *details, struct command_status *cstat, |
| int *errfd) |
{ |
{ |
struct signal_state *ss; | debug_decl(exec_cmnd, SUDO_DEBUG_EXEC) |
debug_decl(save_signals, SUDO_DEBUG_EXEC) | |
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for (ss = saved_signals; ss->signo != -1; ss++) | restore_signals(); |
sigaction(ss->signo, NULL, &ss->sa); | if (exec_setup(details, NULL, -1) == true) { |
| /* headed for execve() */ |
| sudo_debug_execve(SUDO_DEBUG_INFO, details->command, |
| details->argv, details->envp); |
| if (details->closefrom >= 0) { |
| int maxfd = details->closefrom; |
| /* Preserve back channel if present. */ |
| if (errfd != NULL) { |
| dup2(*errfd, maxfd); |
| (void)fcntl(maxfd, F_SETFD, FD_CLOEXEC); |
| *errfd = maxfd++; |
| } |
| if (sudo_debug_fd_set(maxfd) != -1) |
| maxfd++; |
| closefrom(maxfd); |
| } |
| #ifdef HAVE_SELINUX |
| if (ISSET(details->flags, CD_RBAC_ENABLED)) { |
| selinux_execve(details->command, details->argv, details->envp, |
| ISSET(details->flags, CD_NOEXEC)); |
| } else |
| #endif |
| { |
| sudo_execve(details->command, details->argv, details->envp, |
| ISSET(details->flags, CD_NOEXEC)); |
| } |
| cstat->type = CMD_ERRNO; |
| cstat->val = errno; |
| sudo_debug_printf(SUDO_DEBUG_ERROR, "unable to exec %s: %s", |
| details->command, strerror(errno)); |
| } |
debug_return; |
debug_return; |
} |
} |
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/* |
/* |
* Restore signal handlers to initial state. | * Execute a command, potentially in a pty with I/O loggging, and |
*/ | * wait for it to finish. |
void | |
restore_signals(void) | |
{ | |
struct signal_state *ss; | |
debug_decl(restore_signals, SUDO_DEBUG_EXEC) | |
| |
for (ss = saved_signals; ss->signo != -1; ss++) | |
sigaction(ss->signo, &ss->sa, NULL); | |
| |
debug_return; | |
} | |
| |
/* | |
* Execute a command, potentially in a pty with I/O loggging. | |
* This is a little bit tricky due to how POSIX job control works and |
* This is a little bit tricky due to how POSIX job control works and |
* we fact that we have two different controlling terminals to deal with. |
* we fact that we have two different controlling terminals to deal with. |
*/ |
*/ |
Line 248 sudo_execute(struct command_details *details, struct c
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Line 212 sudo_execute(struct command_details *details, struct c
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pid_t child; |
pid_t child; |
debug_decl(sudo_execute, SUDO_DEBUG_EXEC) |
debug_decl(sudo_execute, SUDO_DEBUG_EXEC) |
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dispatch_pending_signals(cstat); |
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/* If running in background mode, fork and exit. */ |
/* If running in background mode, fork and exit. */ |
if (ISSET(details->flags, CD_BACKGROUND)) { |
if (ISSET(details->flags, CD_BACKGROUND)) { |
switch (sudo_debug_fork()) { |
switch (sudo_debug_fork()) { |
Line 278 sudo_execute(struct command_details *details, struct c
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Line 244 sudo_execute(struct command_details *details, struct c
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utmp_user = details->utmp_user ? details->utmp_user : user_details.username; |
utmp_user = details->utmp_user ? details->utmp_user : user_details.username; |
sudo_debug_printf(SUDO_DEBUG_INFO, "allocate pty for I/O logging"); |
sudo_debug_printf(SUDO_DEBUG_INFO, "allocate pty for I/O logging"); |
pty_setup(details->euid, user_details.tty, utmp_user); |
pty_setup(details->euid, user_details.tty, utmp_user); |
|
} else if (!ISSET(details->flags, CD_SET_TIMEOUT) && |
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policy_plugin.u.policy->close == NULL) { |
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/* If no I/O logging, timeout or policy close we can exec directly. */ |
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exec_cmnd(details, cstat, NULL); |
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goto done; |
} |
} |
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/* |
/* |
Line 285 sudo_execute(struct command_details *details, struct c
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Line 256 sudo_execute(struct command_details *details, struct c
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* Parent sends signal info to child and child sends back wait status. |
* Parent sends signal info to child and child sends back wait status. |
*/ |
*/ |
if (socketpair(PF_UNIX, SOCK_DGRAM, 0, sv) == -1) |
if (socketpair(PF_UNIX, SOCK_DGRAM, 0, sv) == -1) |
error(1, _("unable to create sockets")); | fatal(_("unable to create sockets")); |
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/* |
/* |
* We use a pipe to atomically handle signal notification within |
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* the select() loop. |
|
*/ |
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if (pipe_nonblock(signal_pipe) != 0) |
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error(1, _("unable to create pipe")); |
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zero_bytes(&sa, sizeof(sa)); |
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sigemptyset(&sa.sa_mask); |
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/* |
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* Signals to forward to the child process (excluding SIGALRM and SIGCHLD). |
* Signals to forward to the child process (excluding SIGALRM and SIGCHLD). |
|
* We block all other signals while running the signal handler. |
* Note: HP-UX select() will not be interrupted if SA_RESTART set. |
* Note: HP-UX select() will not be interrupted if SA_RESTART set. |
*/ |
*/ |
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memset(&sa, 0, sizeof(sa)); |
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sigfillset(&sa.sa_mask); |
sa.sa_flags = SA_INTERRUPT; /* do not restart syscalls */ |
sa.sa_flags = SA_INTERRUPT; /* do not restart syscalls */ |
#ifdef SA_SIGINFO |
#ifdef SA_SIGINFO |
sa.sa_flags |= SA_SIGINFO; |
sa.sa_flags |= SA_SIGINFO; |
Line 308 sudo_execute(struct command_details *details, struct c
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Line 272 sudo_execute(struct command_details *details, struct c
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#else |
#else |
sa.sa_handler = handler; |
sa.sa_handler = handler; |
#endif |
#endif |
sigaction(SIGALRM, &sa, NULL); | sudo_sigaction(SIGTERM, &sa, NULL); |
sigaction(SIGCHLD, &sa, NULL); | sudo_sigaction(SIGALRM, &sa, NULL); /* XXX - only if there is a timeout */ |
sigaction(SIGPIPE, &sa, NULL); | sudo_sigaction(SIGCHLD, &sa, NULL); |
sigaction(SIGTERM, &sa, NULL); | sudo_sigaction(SIGPIPE, &sa, NULL); |
sigaction(SIGUSR1, &sa, NULL); | sudo_sigaction(SIGUSR1, &sa, NULL); |
sigaction(SIGUSR2, &sa, NULL); | sudo_sigaction(SIGUSR2, &sa, NULL); |
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/* |
/* |
* When not running the command in a pty, we do not want to |
* When not running the command in a pty, we do not want to |
Line 328 sudo_execute(struct command_details *details, struct c
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Line 292 sudo_execute(struct command_details *details, struct c
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sa.sa_sigaction = handler_user_only; |
sa.sa_sigaction = handler_user_only; |
} |
} |
#endif |
#endif |
sigaction(SIGHUP, &sa, NULL); | sudo_sigaction(SIGHUP, &sa, NULL); |
sigaction(SIGINT, &sa, NULL); | sudo_sigaction(SIGINT, &sa, NULL); |
sigaction(SIGQUIT, &sa, NULL); | sudo_sigaction(SIGQUIT, &sa, NULL); |
|
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/* Max fd we will be selecting on. */ |
/* Max fd we will be selecting on. */ |
maxfd = MAX(sv[0], signal_pipe[0]); |
maxfd = MAX(sv[0], signal_pipe[0]); |
Line 349 sudo_execute(struct command_details *details, struct c
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Line 313 sudo_execute(struct command_details *details, struct c
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if (ISSET(details->flags, CD_SET_TIMEOUT)) |
if (ISSET(details->flags, CD_SET_TIMEOUT)) |
alarm(details->timeout); |
alarm(details->timeout); |
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#ifdef HAVE_SETLOCALE |
|
/* |
/* |
* I/O logging must be in the C locale for floating point numbers |
* I/O logging must be in the C locale for floating point numbers |
* to be logged consistently. |
* to be logged consistently. |
*/ |
*/ |
setlocale(LC_ALL, "C"); |
setlocale(LC_ALL, "C"); |
#endif |
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/* |
/* |
* In the event loop we pass input from user tty to master |
* In the event loop we pass input from user tty to master |
Line 393 sudo_execute(struct command_details *details, struct c
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Line 355 sudo_execute(struct command_details *details, struct c
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forward_signals(sv[0]); |
forward_signals(sv[0]); |
} |
} |
if (FD_ISSET(signal_pipe[0], fdsr)) { |
if (FD_ISSET(signal_pipe[0], fdsr)) { |
n = handle_signals(sv, child, log_io, cstat); | n = dispatch_signals(sv, child, log_io, cstat); |
if (n == 0) { |
if (n == 0) { |
/* Child has exited, cstat is set, we are done. */ |
/* Child has exited, cstat is set, we are done. */ |
break; |
break; |
Line 495 do_tty_io:
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Line 457 do_tty_io:
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tq_remove(&sigfwd_list, sigfwd); |
tq_remove(&sigfwd_list, sigfwd); |
efree(sigfwd); |
efree(sigfwd); |
} |
} |
| done: |
debug_return_int(cstat->type == CMD_ERRNO ? -1 : 0); |
debug_return_int(cstat->type == CMD_ERRNO ? -1 : 0); |
} |
} |
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/* |
/* |
* Read signals on fd written to by handler(). | * Read signals on signal_pipe written by handler(). |
* Returns -1 on error, 0 on child exit, else 1. |
* Returns -1 on error, 0 on child exit, else 1. |
*/ |
*/ |
static int |
static int |
handle_signals(int sv[2], pid_t child, int log_io, struct command_status *cstat) | dispatch_signals(int sv[2], pid_t child, int log_io, struct command_status *cstat) |
{ |
{ |
char signame[SIG2STR_MAX]; |
char signame[SIG2STR_MAX]; |
unsigned char signo; |
unsigned char signo; |
ssize_t nread; |
ssize_t nread; |
int status; |
int status; |
pid_t pid; |
pid_t pid; |
debug_decl(handle_signals, SUDO_DEBUG_EXEC) | debug_decl(dispatch_signals, SUDO_DEBUG_EXEC) |
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for (;;) { |
for (;;) { |
/* read signal pipe */ |
/* read signal pipe */ |
Line 573 handle_signals(int sv[2], pid_t child, int log_io, str
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Line 535 handle_signals(int sv[2], pid_t child, int log_io, str
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saved_pgrp = -1; |
saved_pgrp = -1; |
} |
} |
if (signo == SIGTSTP) { |
if (signo == SIGTSTP) { |
zero_bytes(&sa, sizeof(sa)); | memset(&sa, 0, sizeof(sa)); |
sigemptyset(&sa.sa_mask); |
sigemptyset(&sa.sa_mask); |
|
sa.sa_flags = SA_RESTART; |
sa.sa_handler = SIG_DFL; |
sa.sa_handler = SIG_DFL; |
sigaction(SIGTSTP, &sa, &osa); | sudo_sigaction(SIGTSTP, &sa, &osa); |
} |
} |
if (kill(getpid(), signo) != 0) |
if (kill(getpid(), signo) != 0) |
warning("kill(%d, SIG%s)", (int)getpid(), signame); |
warning("kill(%d, SIG%s)", (int)getpid(), signame); |
if (signo == SIGTSTP) |
if (signo == SIGTSTP) |
sigaction(SIGTSTP, &osa, NULL); | sudo_sigaction(SIGTSTP, &osa, NULL); |
if (fd != -1) { |
if (fd != -1) { |
/* |
/* |
* Restore command's process group if different. |
* Restore command's process group if different. |
Line 616 handle_signals(int sv[2], pid_t child, int log_io, str
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Line 579 handle_signals(int sv[2], pid_t child, int log_io, str
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} |
} |
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/* |
/* |
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* Drain pending signals from signale_pipe written by sudo_handler(). |
|
* Handles the case where the signal was sent to us before |
|
* we have executed the command. |
|
* Returns 1 if we should terminate, else 0. |
|
*/ |
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static int |
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dispatch_pending_signals(struct command_status *cstat) |
|
{ |
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ssize_t nread; |
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struct sigaction sa; |
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unsigned char signo = 0; |
|
int rval = 0; |
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debug_decl(dispatch_pending_signals, SUDO_DEBUG_EXEC) |
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|
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for (;;) { |
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nread = read(signal_pipe[0], &signo, sizeof(signo)); |
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if (nread <= 0) { |
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/* It should not be possible to get EOF but just in case. */ |
|
if (nread == 0) |
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errno = ECONNRESET; |
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/* Restart if interrupted by signal so the pipe doesn't fill. */ |
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if (errno == EINTR) |
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continue; |
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/* If pipe is empty, we are done. */ |
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if (errno == EAGAIN) |
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break; |
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sudo_debug_printf(SUDO_DEBUG_ERROR, "error reading signal pipe %s", |
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strerror(errno)); |
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cstat->type = CMD_ERRNO; |
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cstat->val = errno; |
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rval = 1; |
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break; |
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} |
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/* Take the first terminal signal. */ |
|
if (signo == SIGINT || signo == SIGQUIT) { |
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cstat->type = CMD_WSTATUS; |
|
cstat->val = signo + 128; |
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rval = 1; |
|
break; |
|
} |
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} |
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/* Only stop if we haven't already been terminated. */ |
|
if (signo == SIGTSTP) |
|
{ |
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memset(&sa, 0, sizeof(sa)); |
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sigemptyset(&sa.sa_mask); |
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sa.sa_flags = SA_RESTART; |
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sa.sa_handler = SIG_DFL; |
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sudo_sigaction(SIGTSTP, &sa, NULL); |
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if (kill(getpid(), SIGTSTP) != 0) |
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warning("kill(%d, SIGTSTP)", (int)getpid()); |
|
/* No need to reinstall SIGTSTP handler. */ |
|
} |
|
debug_return_int(rval); |
|
} |
|
|
|
/* |
* Forward signals in sigfwd_list to child listening on fd. |
* Forward signals in sigfwd_list to child listening on fd. |
*/ |
*/ |
static void |
static void |
Line 629 forward_signals(int sock)
|
Line 649 forward_signals(int sock)
|
|
|
while (!tq_empty(&sigfwd_list)) { |
while (!tq_empty(&sigfwd_list)) { |
sigfwd = tq_first(&sigfwd_list); |
sigfwd = tq_first(&sigfwd_list); |
if (sig2str(sigfwd->signo, signame) == -1) | if (sigfwd->signo == SIGCONT_FG) |
| strlcpy(signame, "CONT_FG", sizeof(signame)); |
| else if (sigfwd->signo == SIGCONT_BG) |
| strlcpy(signame, "CONT_BG", sizeof(signame)); |
| else if (sig2str(sigfwd->signo, signame) == -1) |
snprintf(signame, sizeof(signame), "%d", sigfwd->signo); |
snprintf(signame, sizeof(signame), "%d", sigfwd->signo); |
sudo_debug_printf(SUDO_DEBUG_INFO, |
sudo_debug_printf(SUDO_DEBUG_INFO, |
"sending SIG%s to child over backchannel", signame); |
"sending SIG%s to child over backchannel", signame); |
Line 668 schedule_signal(int signo)
|
Line 692 schedule_signal(int signo)
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char signame[SIG2STR_MAX]; |
char signame[SIG2STR_MAX]; |
debug_decl(schedule_signal, SUDO_DEBUG_EXEC) |
debug_decl(schedule_signal, SUDO_DEBUG_EXEC) |
|
|
if (sig2str(signo, signame) == -1) | if (signo == SIGCONT_FG) |
| strlcpy(signame, "CONT_FG", sizeof(signame)); |
| else if (signo == SIGCONT_BG) |
| strlcpy(signame, "CONT_BG", sizeof(signame)); |
| else if (sig2str(signo, signame) == -1) |
snprintf(signame, sizeof(signame), "%d", signo); |
snprintf(signame, sizeof(signame), "%d", signo); |
sudo_debug_printf(SUDO_DEBUG_DIAG, "forwarding SIG%s to child", signame); | sudo_debug_printf(SUDO_DEBUG_DIAG, "scheduled SIG%s for child", signame); |
|
|
sigfwd = ecalloc(1, sizeof(*sigfwd)); |
sigfwd = ecalloc(1, sizeof(*sigfwd)); |
sigfwd->prev = sigfwd; |
sigfwd->prev = sigfwd; |