Hello Valery, On 21 March 2010 at 09:41, Valery Reznic <valery_reznic@xxxxxxxxx> wrote: > Hi, somewhere between Fedora 8 and Fedora 12 (2.6.31.5-127.fc12) > execve system call was changed to accept script interpreter that interpreter itself. > But man execve still said: > ----------------------------------------------------- > Interpreter scripts > An interpreter script is a text file that has execute permission > enabled and whose first line is of the form: > > #! interpreter [optional-arg] > > The interpreter must be a valid pathname for an executable which is NOT > ITSELF A SCRIPT. > ----------------------------------------------------- > It's a bit out of date now. So, some much delayed checking confirmed what you say. I applied the patch below. Cheers, Michael --- a/man2/execve.2 +++ b/man2/execve.2 @@ -273,8 +273,7 @@ permission enabled and whose first line is of the form: The .I interpreter -must be a valid pathname for an -executable which is not itself a script. +must be a valid pathname for an executable file. If the .I filename argument of @@ -302,6 +301,13 @@ For portable use, .I optional-arg should either be absent, or be specified as a single word (i.e., it should not contain white space); see NOTES below. + +Since Linux 2.6.28, +.\" commit bf2a9a39639b8b51377905397a5005f444e9a892 +the kernel permits the interpreter of a script to itself be a script. +This permission is recursive, up to a limit of four recursions, +so that the interpreter may be a script which is interpreted by script, +and so on. .SS Limits on size of arguments and environment Most UNIX implementations impose some limit on the total size of the command-line argument @@ -426,6 +432,14 @@ Too many symbolic links were encountered in resolving .I filename or the name of a script or ELF interpreter. .TP +.B ELOOP +The maximum recursion limit was reached during recursive script +interpretation (see "Interpreter scripts", above). +Before Linux 3.8, +.\" commit d740269867021faf4ce38a449353d2b986c34a67 +the error produced for this case was +.BR ENOEXEC . +.TP .B EMFILE The per-process limit on the number of open file descriptors has been reached. .TP -- Michael Kerrisk Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/ Linux/UNIX System Programming Training: http://man7.org/training/ -- To unsubscribe from this list: send the line "unsubscribe linux-man" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
