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* gpg.c (reopen_std): New function to reopen fd 0, 1, or 2 if we are

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called with them closed.  This is to protect our keyring/trustdb files
from corruption if they get attached to one of the standard fds.  Print a
warning if possible that this has happened, and fail completely if we
cannot reopen (should never happen). (main): Call it here.
This commit is contained in:
David Shaw 2006-05-23 22:04:09 +00:00
parent 8fa55e28fe
commit 782a70e522
2 changed files with 72 additions and 0 deletions
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10
g10/ChangeLog
View File

@ -1,3 +1,13 @@
2006-05-23 David Shaw <dshaw@jabberwocky.com>
* gpg.c (reopen_std): New function to reopen fd 0, 1, or 2 if we
are called with them closed. This is to protect our
keyring/trustdb files from corruption if they get attached to one
of the standard fds. Print a warning if possible that this has
happened, and fail completely if we cannot reopen (should never
happen).
(main): Call it here.
2006-05-22 David Shaw <dshaw@jabberwocky.com>
* parse-packet.c (dump_sig_subpkt, parse_signature),

62
g10/gpg.c
View File

@ -1625,6 +1625,67 @@ parse_trust_model(const char *model)
log_error("unknown trust model `%s'\n",model);
}
/* Must be called before we open any files. */
static void
reopen_std(void)
{
#ifdef HAVE_STAT
struct stat statbuf;
int did_stdin=0,did_stdout=0,did_stderr=0;
FILE *complain;
if(fstat(STDIN_FILENO,&statbuf)==-1 && errno==EBADF)
{
if(open("/dev/null",O_RDONLY)==STDIN_FILENO)
did_stdin=1;
else
did_stdin=2;
}
if(fstat(STDOUT_FILENO,&statbuf)==-1 && errno==EBADF)
{
if(open("/dev/null",O_WRONLY)==STDOUT_FILENO)
did_stdout=1;
else
did_stdout=2;
}
if(fstat(STDERR_FILENO,&statbuf)==-1 && errno==EBADF)
{
if(open("/dev/null",O_WRONLY)==STDERR_FILENO)
did_stderr=1;
else
did_stderr=2;
}
/* It's hard to log this sort of thing since the filehandle we would
complain to may be closed... */
if(did_stderr==0)
complain=stderr;
else if(did_stdout==0)
complain=stdout;
else
complain=NULL;
if(complain)
{
if(did_stdin==1)
fprintf(complain,"gpg: WARNING: standard input reopened\n");
if(did_stdout==1)
fprintf(complain,"gpg: WARNING: standard output reopened\n");
if(did_stderr==1)
fprintf(complain,"gpg: WARNING: standard error reopened\n");
if(did_stdin==2 || did_stdout==2 || did_stderr==2)
fprintf(complain,"gpg: fatal: unable to reopen standard input,"
" output, or error\n");
}
if(did_stdin==2 || did_stdout==2 || did_stderr==2)
exit(3);
#endif
}
int
main (int argc, char **argv )
{
@ -1675,6 +1736,7 @@ main (int argc, char **argv )
opt.lock_once = 1;
#endif /* __riscos__ */
reopen_std();
trap_unaligned();
secmem_set_flags( secmem_get_flags() | 2 ); /* suspend warnings */
/* Please note that we may running SUID(ROOT), so be very CAREFUL