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Fix a problem with select and high fds.

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* cipher/rndlinux.c (rndlinux_gather_random): Check fd before using
FD_SET.
--

If on systems where the maximum number of fds may be dynamically
configured to a value of FD_MAXSIZE or higher and the RNG is first
used after more than FD_SETSIZE-1 descriptors are in use, we disable
the progress messages from the RNG.  A better solution would be too
use poll but that requires more tests.

The same problem exists in rndunix.c - however this rng is only used
on old Unices and I assume that they don't feature dynamically
configured maximum fd sizes.

(from Libgcrypt commit 9487099071af4478d2882e633a0ade805801d6fa)

This may fix
GnuPG-bug-id: 1818
This commit is contained in:
Werner Koch 2015-01-19 16:46:05 +01:00
parent ed6287d2e1
commit 8adb5ff260
2 changed files with 22 additions and 15 deletions
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29
cipher/rndlinux.c
View File

@ -117,28 +117,33 @@ rndlinux_gather_random( void (*add)(const void*, size_t, int), int requester,
#endif
#endif
while( length ) {
#ifdef FD_SETSIZE
fd_set rfds;
struct timeval tv;
int rc;
int rc;
FD_ZERO(&rfds);
FD_SET(fd, &rfds);
tv.tv_sec = 3;
tv.tv_usec = 0;
if( !(rc=select(fd+1, &rfds, NULL, NULL, &tv)) ) {
if( !warn )
if (fd < FD_SETSIZE)
{
FD_SET(fd, &rfds);
if( !(rc=select(fd+1, &rfds, NULL, NULL, &tv)) ) {
if( !warn )
tty_printf(
_("\n"
"Not enough random bytes available. Please do some other work to give\n"
"the OS a chance to collect more entropy! (Need %d more bytes)\n"), (int)length );
warn = 1;
continue;
}
else if( rc == -1 ) {
tty_printf(
"select() error: %s\n", strerror(errno));
continue;
}
warn = 1;
continue;
}
else if( rc == -1 ) {
tty_printf(
"select() error: %s\n", strerror(errno));
continue;
}
}
#endif /*FD_SETSIZE*/
do {
int nbytes = length < sizeof(buffer)? length : sizeof(buffer);

2
cipher/rndunix.c
View File

@ -625,6 +625,8 @@ slow_poll(FILE *dbgfp, int dbgall, size_t *nbytes )
FD_ZERO(&fds);
for (i = 0; dataSources[i].path != NULL; i++) {
if (dataSources[i].pipe != NULL) {
/* FIXME: We need to make sure that PIPEFD is less
than FD_SETSIZE. */
FD_SET(dataSources[i].pipeFD, &fds);
moreSources = 1;
}