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Fix miscellaneous update-game-score bugs.

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* configure.ac (difftime): Remove.
* lib/update-game-score.c (difftime) [!HAVE_DIFFTIME]: Remove.
(read_score) [HAVE_GETDELIM]: Don't access uninitialized storage.
(read_scores, write_scores): Check for fclose failure.
(write_scores): Use fchmod, not chmod, to avoid a race.
(lock_file): Fix test for out-of-date lock file; it was reversed.
Use ordinary subtraction rather than difftime; since we're already
assuming POSIX we don't need to worry about the possibility of
time_t being a magic cookie.
This commit is contained in:
Paul Eggert 2014-01-22 11:02:41 -08:00
parent edace89f26
commit dc217d0180
4 changed files with 25 additions and 13 deletions
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5
ChangeLog
View file

@ -1,3 +1,8 @@
2014-01-22 Paul Eggert <eggert@cs.ucla.edu>
Fix miscellaneous update-game-score bugs.
* configure.ac (difftime): Remove.
2014-01-20 Paul Eggert <eggert@cs.ucla.edu>
Merge from gnulib, incorporating:

1
configure.ac
View file

@ -3468,7 +3468,6 @@ getrlimit setrlimit shutdown getaddrinfo \
strsignal setitimer \
sendto recvfrom getsockname getpeername getifaddrs freeifaddrs \
gai_strerror getline getdelim sync \
difftime \
getpwent endpwent getgrent endgrent \
touchlock \
cfmakeraw cfsetspeed copysign __executable_start log2)

12
lib-src/ChangeLog
View file

@ -1,3 +1,15 @@
2014-01-22 Paul Eggert <eggert@cs.ucla.edu>
Fix miscellaneous update-game-score bugs.
* update-game-score.c (difftime) [!HAVE_DIFFTIME]: Remove.
(read_score) [HAVE_GETDELIM]: Don't access uninitialized storage.
(read_scores, write_scores): Check for fclose failure.
(write_scores): Use fchmod, not chmod, to avoid a race.
(lock_file): Fix test for out-of-date lock file; it was reversed.
Use ordinary subtraction rather than difftime; since we're already
assuming POSIX we don't need to worry about the possibility of
time_t being a magic cookie.
2014-01-19 Paul Eggert <eggert@cs.ucla.edu>
update-game-score fixes for -m and integer overflow (Bug#16428)

20
lib-src/update-game-score.c
View file

@ -59,11 +59,6 @@ along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. */
#define MAX_ATTEMPTS 5
#define MAX_DATA_LEN 1024
#ifndef HAVE_DIFFTIME
/* OK on POSIX (time_t is arithmetic type) modulo overflow in subtraction. */
#define difftime(t1, t0) (double)((t1) - (t0))
#endif
static _Noreturn void
usage (int err)
{
@ -275,6 +270,7 @@ read_score (FILE *f, struct score_entry *score)
#ifdef HAVE_GETDELIM
{
size_t count = 0;
score->username = 0;
if (getdelim (&score->username, &count, ' ', f) < 1
|| score->username == NULL)
return -1;
@ -371,14 +367,13 @@ read_scores (const char *filename, struct score_entry **scores,
while ((readval = read_score (f, &entry)) == 0)
if (push_score (&ret, &scorecount, &cursize, &entry) < 0)
return -1;
if (readval > 0)
if (readval > 0 && fclose (f) == 0)
{
*count = scorecount;
*alloc = cursize;
*scores = ret;
retval = 0;
}
fclose (f);
return retval;
}
@ -448,6 +443,8 @@ write_scores (const char *filename, const struct score_entry *scores,
fd = mkostemp (tempfile, 0);
if (fd < 0)
return -1;
if (fchmod (fd, 0644) != 0)
return -1;
f = fdopen (fd, "w");
if (! f)
return -1;
@ -456,10 +453,9 @@ write_scores (const char *filename, const struct score_entry *scores,
scores[i].score, scores[i].username, scores[i].data)
< 0)
return -1;
fclose (f);
if (rename (tempfile, filename) < 0)
if (fclose (f) != 0)
return -1;
if (chmod (filename, 0644) < 0)
if (rename (tempfile, filename) != 0)
return -1;
return 0;
}
@ -479,9 +475,9 @@ lock_file (const char *filename, void **state)
*state = lockpath;
trylock:
attempts++;
/* If the lock is over an hour old, delete it. */
/* If the lock is over an hour old, delete it. */
if (stat (lockpath, &buf) == 0
&& (difftime (buf.st_ctime, time (NULL) > 60*60)))
&& 60 * 60 < time (0) - buf.st_ctime)
unlink (lockpath);
fd = open (lockpath, O_CREAT | O_EXCL, 0600);
if (fd < 0)