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authorAndreas Schwab <schwab@suse.de>2012-12-04 16:14:13 +0100
committerAndreas Schwab <schwab@suse.de>2013-04-15 10:33:52 +0200
commit306dfba9e1daac21ab5a45256b367aea9cf9c3ee (patch)
tree733e50d1d866af426cab811c4527733bc1eb4eeb /nscd/pwdcache.c
parent206a6699116215c591c8562c67106f7e17146608 (diff)
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Properly check for short writes when sending the response in nscd
Diffstat (limited to 'nscd/pwdcache.c')
-rw-r--r--nscd/pwdcache.c40
1 files changed, 24 insertions, 16 deletions
diff --git a/nscd/pwdcache.c b/nscd/pwdcache.c
index ef492b5..4f3fb41 100644
--- a/nscd/pwdcache.c
+++ b/nscd/pwdcache.c
@@ -81,8 +81,8 @@ cache_addpw (struct database_dyn *db, int fd, request_header *req,
const void *key, struct passwd *pwd, uid_t owner,
struct hashentry *const he, struct datahead *dh, int errval)
{
+ bool all_written = true;
ssize_t total;
- ssize_t written;
time_t t = time (NULL);
/* We allocate all data in one memory block: the iov vector,
@@ -111,17 +111,18 @@ cache_addpw (struct database_dyn *db, int fd, request_header *req,
/* Reload with the same time-to-live value. */
timeout = dh->timeout = t + db->postimeout;
- written = total = 0;
+ total = 0;
}
else
{
/* We have no data. This means we send the standard reply for this
case. */
- written = total = sizeof (notfound);
+ total = sizeof (notfound);
- if (fd != -1)
- written = TEMP_FAILURE_RETRY (send (fd, &notfound, total,
- MSG_NOSIGNAL));
+ if (fd != -1
+ && TEMP_FAILURE_RETRY (send (fd, &notfound, total,
+ MSG_NOSIGNAL)) != total)
+ all_written = false;
/* If we have a transient error or cannot permanently store
the result, so be it. */
@@ -189,9 +190,9 @@ cache_addpw (struct database_dyn *db, int fd, request_header *req,
n = snprintf (buf, buf_len, "%d%c%n%s", pwd->pw_uid, '\0',
&key_offset, (char *) key) + 1;
- written = total = (offsetof (struct dataset, strdata)
- + pw_name_len + pw_passwd_len
- + pw_gecos_len + pw_dir_len + pw_shell_len);
+ total = (offsetof (struct dataset, strdata)
+ + pw_name_len + pw_passwd_len
+ + pw_gecos_len + pw_dir_len + pw_shell_len);
/* If we refill the cache, first assume the reconrd did not
change. Allocate memory on the cache since it is likely
@@ -304,20 +305,27 @@ cache_addpw (struct database_dyn *db, int fd, request_header *req,
<= (sizeof (struct database_pers_head)
+ db->head->module * sizeof (ref_t)
+ db->head->data_size));
- written = sendfileall (fd, db->wr_fd,
- (char *) &dataset->resp
- - (char *) db->head, dataset->head.recsize );
+ ssize_t written = sendfileall (fd, db->wr_fd,
+ (char *) &dataset->resp
+ - (char *) db->head,
+ dataset->head.recsize);
+ if (written != dataset->head.recsize)
+ {
# ifndef __ASSUME_SENDFILE
- if (written == -1 && errno == ENOSYS)
- goto use_write;
+ if (written == -1 && errno == ENOSYS)
+ goto use_write;
# endif
+ all_written = false;
+ }
}
else
# ifndef __ASSUME_SENDFILE
use_write:
# endif
#endif
- written = writeall (fd, &dataset->resp, dataset->head.recsize);
+ if (writeall (fd, &dataset->resp, dataset->head.recsize)
+ != dataset->head.recsize)
+ all_written = false;
}
@@ -377,7 +385,7 @@ cache_addpw (struct database_dyn *db, int fd, request_header *req,
}
}
- if (__builtin_expect (written != total, 0) && debug_level > 0)
+ if (__builtin_expect (!all_written, 0) && debug_level > 0)
{
char buf[256];
dbg_log (_("short write in %s: %s"), __FUNCTION__,