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The fixargs() function is invoked when ksh needs to run a script
without a #!/hashbang/path. Instead of letting the kernel invoke a
shell, ksh exfile()s the script itself from sh_main(). In the
forked child, it calls fixargs() to set the argument list in the
environment to the args of the new script, so that 'ps' and
/proc/PID/cmdline show the expected output.
But fixargs() is broken because, on systems other than HP-UX (on
which ksh uses pstat(2)), ksh simply inserts a terminating zero.
The arguments list is not a zero-terminated C string. Unix systems
expect the entire arguments buffer to be zeroed out, otherwise 'ps'
and /proc/*/cmdline will have fragments of previous command lines
in the output.
The Red Hat patch for this bug is:
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||
|---|---|---|
| .. | ||
| argnod.h | ||
| builtins.h | ||
| defs.h | ||
| edit.h | ||
| fault.h | ||
| fcin.h | ||
| history.h | ||
| io.h | ||
| jobs.h | ||
| lexstates.h | ||
| name.h | ||
| national.h | ||
| nval.h | ||
| path.h | ||
| regress.h | ||
| shell.h | ||
| shlex.h | ||
| shnodes.h | ||
| shtable.h | ||
| streval.h | ||
| terminal.h | ||
| test.h | ||
| timeout.h | ||
| ulimit.h | ||
| variables.h | ||
| version.h | ||