86 lines
3 KiB
Diff
86 lines
3 KiB
Diff
From 61d7788b83b302207a67b82786f4fd79e3538f30 Mon Sep 17 00:00:00 2001
|
|
From: Andreas Gruenbacher <agruen@gnu.org>
|
|
Date: Thu, 27 Jun 2019 11:10:43 +0200
|
|
Subject: [PATCH] Don't crash when RLIMIT_NOFILE is set to RLIM_INFINITY
|
|
|
|
* src/safe.c (min_cached_fds): Define minimum number of cached dir file
|
|
descriptors.
|
|
(max_cached_fds): Change type to rlim_t to allow storing RLIM_INFINITY.
|
|
(init_dirfd_cache): Set max_cached_fds to RLIM_INFINITY when RLIMIT_NOFILE is
|
|
RLIM_INFINITY. Set the initial hash table size to min_cached_fds, independent
|
|
of RLIMIT_NOFILE: patches commonly only affect one or a few files, so a small
|
|
hash table will usually suffice; if needed, the hash table will grow.
|
|
(insert_cached_dirfd): Don't shrink the cache when max_cached_fds is
|
|
RLIM_INFINITY.
|
|
---
|
|
src/safe.c | 36 +++++++++++++++++++++++-------------
|
|
1 file changed, 23 insertions(+), 13 deletions(-)
|
|
|
|
diff --git a/src/safe.c b/src/safe.c
|
|
index 5a7202f..f147b0e 100644
|
|
--- a/src/safe.c
|
|
+++ b/src/safe.c
|
|
@@ -67,7 +67,8 @@ struct cached_dirfd {
|
|
};
|
|
|
|
static Hash_table *cached_dirfds = NULL;
|
|
-static size_t max_cached_fds;
|
|
+static rlim_t min_cached_fds = 8;
|
|
+static rlim_t max_cached_fds;
|
|
LIST_HEAD (lru_list);
|
|
|
|
static size_t hash_cached_dirfd (const void *entry, size_t table_size)
|
|
@@ -98,11 +99,17 @@ static void init_dirfd_cache (void)
|
|
{
|
|
struct rlimit nofile;
|
|
|
|
- max_cached_fds = 8;
|
|
if (getrlimit (RLIMIT_NOFILE, &nofile) == 0)
|
|
- max_cached_fds = MAX (nofile.rlim_cur / 4, max_cached_fds);
|
|
+ {
|
|
+ if (nofile.rlim_cur == RLIM_INFINITY)
|
|
+ max_cached_fds = RLIM_INFINITY;
|
|
+ else
|
|
+ max_cached_fds = MAX (nofile.rlim_cur / 4, min_cached_fds);
|
|
+ }
|
|
+ else
|
|
+ max_cached_fds = min_cached_fds;
|
|
|
|
- cached_dirfds = hash_initialize (max_cached_fds,
|
|
+ cached_dirfds = hash_initialize (min_cached_fds,
|
|
NULL,
|
|
hash_cached_dirfd,
|
|
compare_cached_dirfds,
|
|
@@ -148,20 +155,23 @@ static void insert_cached_dirfd (struct cached_dirfd *entry, int keepfd)
|
|
if (cached_dirfds == NULL)
|
|
init_dirfd_cache ();
|
|
|
|
- /* Trim off the least recently used entries */
|
|
- while (hash_get_n_entries (cached_dirfds) >= max_cached_fds)
|
|
+ if (max_cached_fds != RLIM_INFINITY)
|
|
{
|
|
- struct cached_dirfd *last =
|
|
- list_entry (lru_list.prev, struct cached_dirfd, lru_link);
|
|
- if (&last->lru_link == &lru_list)
|
|
- break;
|
|
- if (last->fd == keepfd)
|
|
+ /* Trim off the least recently used entries */
|
|
+ while (hash_get_n_entries (cached_dirfds) >= max_cached_fds)
|
|
{
|
|
- last = list_entry (last->lru_link.prev, struct cached_dirfd, lru_link);
|
|
+ struct cached_dirfd *last =
|
|
+ list_entry (lru_list.prev, struct cached_dirfd, lru_link);
|
|
if (&last->lru_link == &lru_list)
|
|
break;
|
|
+ if (last->fd == keepfd)
|
|
+ {
|
|
+ last = list_entry (last->lru_link.prev, struct cached_dirfd, lru_link);
|
|
+ if (&last->lru_link == &lru_list)
|
|
+ break;
|
|
+ }
|
|
+ remove_cached_dirfd (last);
|
|
}
|
|
- remove_cached_dirfd (last);
|
|
}
|
|
|
|
/* Only insert if the parent still exists. */
|