Add execv(3) support to sudo_intercept.so.

This allows intercept to work with csh which uses execv(3) not execve(2).

doc/sudo.conf.man.in

@@ -769,10 +769,10 @@ front end configuration
 # Sudo command interception:
 #   Path intercept /path/to/sudo_intercept.so
 #
-# Path to a shared library containing replacements for the execv(),
-# execve() and fexecve() library functions that perform a policy check
-# to verify the command is allowed and simply return an error if not.
-# This is used to implement the "intercept" functionality on systems that
+# Path to a shared library containing replacements for the execv()
+# and execve() library functions that perform a policy check to verify
+# the command is allowed and simply return an error if not.  This is
+# used to implement the "intercept" functionality on systems that
 # support LD_PRELOAD or its equivalent.
 #
 # The compiled-in value is usually sufficient and should only be changed
@@ -784,10 +784,10 @@ front end configuration
 # Sudo noexec:
 #   Path noexec /path/to/sudo_noexec.so
 #
-# Path to a shared library containing replacements for the execv(),
-# execve() and fexecve() library functions that just return an error.
-# This is used to implement the "noexec" functionality on systems that
-# support LD_PRELOAD or its equivalent.
+# Path to a shared library containing replacements for the execv()
+# family of library functions that just return an error.  This is
+# used to implement the "noexec" functionality on systems that support
+# LD_PRELOAD or its equivalent.
 #
 # The compiled-in value is usually sufficient and should only be changed
 # if you rename or move the sudo_noexec.so file.

doc/sudo.conf.mdoc.in

@@ -699,10 +699,10 @@ front end configuration
 # Sudo command interception:
 #   Path intercept /path/to/sudo_intercept.so
 #
-# Path to a shared library containing replacements for the execv(),
-# execve() and fexecve() library functions that perform a policy check
-# to verify the command is allowed and simply return an error if not.
-# This is used to implement the "intercept" functionality on systems that
+# Path to a shared library containing replacements for the execv()
+# and execve() library functions that perform a policy check to verify
+# the command is allowed and simply return an error if not.  This is
+# used to implement the "intercept" functionality on systems that
 # support LD_PRELOAD or its equivalent.
 #
 # The compiled-in value is usually sufficient and should only be changed
@@ -714,10 +714,10 @@ front end configuration
 # Sudo noexec:
 #   Path noexec /path/to/sudo_noexec.so
 #
-# Path to a shared library containing replacements for the execv(),
-# execve() and fexecve() library functions that just return an error.
-# This is used to implement the "noexec" functionality on systems that
-# support LD_PRELOAD or its equivalent.
+# Path to a shared library containing replacements for the execv()
+# family of library functions that just return an error.  This is
+# used to implement the "noexec" functionality on systems that support
+# LD_PRELOAD or its equivalent.
 #
 # The compiled-in value is usually sufficient and should only be changed
 # if you rename or move the sudo_noexec.so file.

doc/sudoers.man.in

@@ -2763,8 +2763,10 @@ If set,
 \fBsudoers\fR
 will log when a command spawns a child process and executes a program
 using the
+\fBexecv\fR()
+or
 \fBexecve\fR()
-system call.
+library functions.
 For example, if a shell is run by
 \fBsudo\fR,
 the individual commands run via the shell will be logged.

doc/sudoers.mdoc.in

@@ -2603,8 +2603,10 @@ If set,
 .Nm
 will log when a command spawns a child process and executes a program
 using the
+.Fn execv
+or
 .Fn execve
-system call.
+library functions.
 For example, if a shell is run by
 .Nm sudo ,
 the individual commands run via the shell will be logged.

src/intercept.exp

@@ -1 +1,2 @@
+execv
 execve

src/sudo_intercept.c

@@ -48,6 +48,7 @@
 #include "sudo_util.h"
 #include "pathnames.h"
 
+extern char **environ;
 extern bool command_allowed(const char *cmnd, char * const argv[], char * const envp[], char **ncmnd, char ***nargv, char ***nenvp);
 
 #ifdef HAVE___INTERPOSE
@@ -81,10 +82,17 @@ my_execve(const char *cmnd, char * const argv[], char * const envp[])
     return -1;
 }
 
+static int
+my_execv(const char *cmnd, char * const argv[])
+{
+    return my_execve(cmnd, argv, environ);
+}
+
 /* Magic to tell dyld to do symbol interposition. */
 __attribute__((__used__)) static const interpose_t interposers[]
 __attribute__((__section__("__DATA,__interpose"))) = {
     { (void *)my_execve, (void *)execve }
+    { (void *)my_execv, (void *)execv }
 };
 
 #else /* HAVE___INTERPOSE */
@@ -148,4 +156,10 @@ execve(const char *cmnd, char * const argv[], char * const envp[])
 
     return -1;
 }
+
+sudo_dso_public int
+execv(const char *cmnd, char * const argv[])
+{
+    return execve(cmnd, argv, environ);
+}
 #endif /* HAVE___INTERPOSE) */