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