Re: Fwd: Bug#249083: postgresql: Postgres SIGSEGV if wins in nsswitch.conf

Martin Pitt <martin(at)piware(dot)de> writes:
> 2004-05-14 14:50:14 [8725] LOG: authentication file token too long, skippi=
> ng: "=98.=ED=F1
> Segmentation fault

Looking at the only place this message is produced, in
src/backend/libpq/hba.c, it appears that we are printing a string buffer
that is not guaranteed null-terminated. The segfault might be due to
that. I would suggest adding more paranoia along these lines:

if (buf >= end_buf)
{
+ *buf = '\0';
ereport(LOG,
(errcode(ERRCODE_CONFIG_FILE_ERROR),
errmsg("authentication file token too long, skipping: \"%s\"",
buf)));
/* Discard remainder of line */
while ((c = getc(fp)) != EOF && c != '\n')
;
- buf[0] = '\0';
break;
}

This won't fix the underlying problem (where is the junk data coming
from?) but it might at least let you get further in your investigation.

regards, tom lane