sys_execve [arch/i386/kernel/process.c]
Executes a new program. Upon execution of a new program text, data, bss, and stack of the calling process are overwritten by that of the program loaded. The program invoked inherits the calling process's PID, and any open file descriptors that are not set to close-on-exec. Signals pending on the calling process are cleared. Any signals set to be caught by the calling process are reset to their default behavior. The SIGCHLD signal (when set to SIG_IGN) may or may not be reset to SIG_DFL. Arguments
eax | 11
ebx | A pointer to a null-terminated string that specifies the filename of the file to execute. It could be either a binary file or a script starting with a line of the form "#! interpreter [arg]". In the latter case, the interpreter must be a valid pathname for an executable which is not itself a script, which will be invoked as interpreter [arg] filename. (See Remarks for more information)
ecx | Pointer to a null terminated array of pointers to the argument strings that will be passed to the new program.
edx | Pointer to a null terminated array of pointers to the strings, conventionally of the form key=value, which are passed as environment to the new program.
Return values If the system call succeeds it does not return. If the system call fails the return value is one of the following errno values:
`-E2BIG` | `The total number of bytes in the environment and argument list is too large.`
`-EACCES` | `Search permission is denied on a component of the path prefix of filename pointed by ebx or the name of a script interpreter. -or- The file or a script interpreter is not a regular file. -or- Execute permission is denied for the file or a script or ELF interpreter. -or- The file system is mounted noexec.`
`-EFAULT` | `ebx or edx points outside your accessible address space.`
`-EINVAL` | `An ELF executable had more than one PT_INTERP segment (i.e., tried to name more than one interpreter).`
`-EIO` | `An I/O error occurred.`
`-EISDIR` | `An ELF interpreter was a directory.`
`-ELIBBAD` | `An ELF interpreter was not in a recognised format.`
`-ELOOP` | `Too many symbolic links were encountered in resolving filename pointed by ebx or the name of a script or ELF interpreter.`
`-EMFILE` | `The process has the maximum number of files open.`
`-ENAMETOOLONG` | `Filename pointed by ebx is too long.`
`-ENFILE` | `The system limit on the total number of open files has been reached.`
`-ENOENT` | `The file filename or a script or ELF interpreter does not exist, or a shared library needed for file or interpreter cannot be found.`
`-ENOEXEC` | `An executable is not in a recognised format, is for the wrong architecture, or has some other format error that means it cannot be executed.`
`-ENOMEM` | `Insufficient kernel memory was available.`
`-ENOTDIR` | `A component of the path prefix of filename or a script or ELF interpreter is not a directory.`
`-EPERM` | `The file system is mounted nosuid, the user is not the superuser, and the file has an SUID or SGID bit set. -or- The process is being traced, the user is not the superuser and the file has an SUID or SGID bit set.`
`-ETXTBSY` | `Executable was open for writing by one or more processes.`
Remarks If the current program is being ptraced, a SIGTRAP is sent to it after a successful sys_execve. If the set-user-ID bit is set on the program file pointed to by ebx, and the calling process is not being ptraced, then the effective user ID of the calling process is changed to that of the owner of the program file. i Similarly, when the set-group-ID bit of the program file is set the effective group ID of the calling process is set to the group of the program file. The effective user ID of the process is copied to the saved set-user-ID; similarly, the effective group ID is copied to the saved set-group-ID. This copying takes place after any effective ID changes that occur because of the set-user-ID and set-group-ID permission bits. If the executable is an a.out dynamically-linked binary executable containing shared-library stubs, the Linux dynamic linker ld.so is called at the start of execution to bring needed shared libraries into memory and link the executable with them. If the executable is a dynamically-linked ELF executable, the interpreter named in the PT_INTERP segment is used to load the needed shared libraries. This interpreter is typically /lib/ld-linux.so.1 for binaries linked with the Linux libc version 5, or /lib/ld-linux.so.2 for binaries linked with the GNU libc version 2. SUID and SGID processes can not be ptraced. SUID and SGID bits on scripts are ignored. The result of mounting a filesystem nosuid vary between Linux kernel versions: some will refuse execution of SUID/SGID executables when this would give the user powers she did not have already (and return -EPERM), some will just ignore the SUID/SGID bits and sys_execve successfully. A maximum line length of 127 characters is allowed for the first line in a #! executable shell script. Compatibility n/a