| execve.2 (207735) | execve.2 (208027) |
|---|---|
| 1.\" Copyright (c) 1980, 1991, 1993 2.\" The Regents of the University of California. All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. --- 12 unchanged lines hidden (view full) --- 21.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26.\" SUCH DAMAGE. 27.\" 28.\" @(#)execve.2 8.5 (Berkeley) 6/1/94 | 1.\" Copyright (c) 1980, 1991, 1993 2.\" The Regents of the University of California. All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. --- 12 unchanged lines hidden (view full) --- 21.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26.\" SUCH DAMAGE. 27.\" 28.\" @(#)execve.2 8.5 (Berkeley) 6/1/94 |
| 29.\" $FreeBSD: head/lib/libc/sys/execve.2 207735 2010-05-06 22:49:54Z jilles $ | 29.\" $FreeBSD: head/lib/libc/sys/execve.2 208027 2010-05-13 12:07:55Z uqs $ |
| 30.\" 31.Dd April 10, 2008 32.Dt EXECVE 2 33.Os 34.Sh NAME 35.Nm execve , 36.Nm fexecve 37.Nd execute a file --- 270 unchanged lines hidden (view full) --- 308.Fn fexecve 309will fail and return to the calling process if: 310.Bl -tag -width Er 311.It Bq Er EBADF 312The 313.Fa fd 314argument is not a valid file descriptor open for executing. 315.El | 30.\" 31.Dd April 10, 2008 32.Dt EXECVE 2 33.Os 34.Sh NAME 35.Nm execve , 36.Nm fexecve 37.Nd execute a file --- 270 unchanged lines hidden (view full) --- 308.Fn fexecve 309will fail and return to the calling process if: 310.Bl -tag -width Er 311.It Bq Er EBADF 312The 313.Fa fd 314argument is not a valid file descriptor open for executing. 315.El |
| 316.Sh CAVEATS 317If a program is 318.Em setuid 319to a non-super-user, but is executed when 320the real 321.Em uid 322is ``root'', then the program has some of the powers 323of a super-user as well. 324.Pp 325When executing an interpreted program through 326.Fn fexecve , 327kernel supplies 328.Pa /dev/fd/n 329as a second argument to the interpreter, 330where 331.Ar n 332is the file descriptor passed in the 333.Fa fd 334argument to 335.Fn fexecve . 336For this construction to work correctly, the 337.Xr fdescfs 5 338filesystem shall be mounted on 339.Pa /dev/fd . | |
| 340.Sh SEE ALSO 341.Xr ktrace 1 , 342.Xr _exit 2 , 343.Xr fork 2 , 344.Xr open 2 , 345.Xr execl 3 , 346.Xr exit 3 , 347.Xr sysctl 3 , --- 20 unchanged lines hidden (view full) --- 368The 369.Fn execve 370system call appeared in 371.Bx 4.2 . 372The 373.Fn fexecve 374system call appeared in 375.Fx 8.0 . | 316.Sh SEE ALSO 317.Xr ktrace 1 , 318.Xr _exit 2 , 319.Xr fork 2 , 320.Xr open 2 , 321.Xr execl 3 , 322.Xr exit 3 , 323.Xr sysctl 3 , --- 20 unchanged lines hidden (view full) --- 344The 345.Fn execve 346system call appeared in 347.Bx 4.2 . 348The 349.Fn fexecve 350system call appeared in 351.Fx 8.0 . |
| 352.Sh CAVEATS 353If a program is 354.Em setuid 355to a non-super-user, but is executed when 356the real 357.Em uid 358is ``root'', then the program has some of the powers 359of a super-user as well. 360.Pp 361When executing an interpreted program through 362.Fn fexecve , 363kernel supplies 364.Pa /dev/fd/n 365as a second argument to the interpreter, 366where 367.Ar n 368is the file descriptor passed in the 369.Fa fd 370argument to 371.Fn fexecve . 372For this construction to work correctly, the 373.Xr fdescfs 5 374filesystem shall be mounted on 375.Pa /dev/fd . |
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