Various fixes within, e.g. mutexes deadlocking sometimes. https://sourceware.org/git/?p=glibc.git;a=blob;f=NEWS;h=f7057710f14d6cwip/yesman
Vladimír Čunát
7 years ago
parent
0cdbd2d662
commit
51cf42ad0d
Binary file not shown.
@ -1,209 +0,0 @@ |
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From ba67ba3275d47e0080f0e5f09d9f5102c000c97e Mon Sep 17 00:00:00 2001
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Message-Id: <ba67ba3275d47e0080f0e5f09d9f5102c000c97e.1495998948.git.fweimer@redhat.com>
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In-Reply-To: <cover.1495998948.git.fweimer@redhat.com>
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References: <cover.1495998948.git.fweimer@redhat.com>
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From: Florian Weimer <fweimer@redhat.com>
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Date: Sun, 28 May 2017 20:44:52 +0200
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Subject: [PATCH 3/3] rtld: Reject overly long LD_AUDIT path elements
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To: libc-alpha@sourceware.org
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Also only process the last LD_AUDIT entry.
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---
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elf/rtld.c | 110 ++++++++++++++++++++++++++++++++++++++++++++++++++++---------
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1 file changed, 95 insertions(+), 15 deletions(-)
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diff --git a/elf/rtld.c b/elf/rtld.c
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index 30f0cae..89d8573 100644
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--- a/elf/rtld.c
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+++ b/elf/rtld.c
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@@ -116,13 +116,95 @@ dso_name_valid_for_suid (const char *p)
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return *p != '\0';
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}
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-/* List of auditing DSOs. */
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+/* LD_AUDIT variable contents. Must be processed before the
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+ audit_list below. */
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+const char *audit_list_string;
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+
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+/* Cyclic list of auditing DSOs. audit_list->next is the first
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+ element. */
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static struct audit_list
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{
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const char *name;
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struct audit_list *next;
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} *audit_list;
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+/* Iterator for audit_list_string followed by audit_list. */
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+struct audit_list_iter
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+{
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+ /* Tail of audit_list_string still needing processing, or NULL. */
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+ const char *audit_list_tail;
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+
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+ /* The list element returned in the previous iteration. NULL before
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+ the first element. */
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+ struct audit_list *previous;
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+
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+ /* Scratch buffer for returning a name which is part of
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+ audit_list_string. */
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+#ifdef PATH_MAX
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+ char fname[PATH_MAX];
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+#else
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+ char fname[4096];
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+#endif
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+};
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+
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+/* Initialize an audit list iterator. */
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+static void
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+audit_list_iter_init (struct audit_list_iter *iter)
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+{
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+ iter->audit_list_tail = audit_list_string;
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+ iter->previous = NULL;
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+}
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+
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+/* Iterate through both audit_list_string and audit_list. */
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+static const char *
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+audit_list_iter_next (struct audit_list_iter *iter)
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+{
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+ if (iter->audit_list_tail != NULL)
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+ {
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+ /* First iterate over audit_list_string. */
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+ while (*iter->audit_list_tail != '\0')
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+ {
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+ /* Split audit list at colon. */
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+ size_t len = strcspn (iter->audit_list_tail, ":");
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+ if (len > 0 && len < sizeof(iter->fname))
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+ {
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+ memcpy (iter->fname, iter->audit_list_tail, len);
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+ iter->fname[len] = '\0';
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+ }
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+ else
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+ /* Do not return this name to the caller. */
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+ iter->fname[0] = '\0';
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+
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+ /* Skip over the substring and the following delimiter. */
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+ iter->audit_list_tail += len;
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+ if (*iter->audit_list_tail == ':')
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+ ++iter->audit_list_tail;
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+
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+ /* If the name is valid, return it. */
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+ if (dso_name_valid_for_suid (iter->fname))
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+ return iter->fname;
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+ /* Otherwise, wrap around and try the next name. */
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+ }
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+ /* Fall through to the procesing of audit_list. */
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+ }
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+
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+ if (iter->previous == NULL)
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+ {
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+ if (audit_list == NULL)
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+ /* No pre-parsed audit list. */
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+ return NULL;
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+ /* Start of audit list. The first list element is at
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+ audit_list->next (cyclic list). */
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+ iter->previous = audit_list->next;
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+ return iter->previous->name;
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+ }
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+ if (iter->previous == audit_list)
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+ /* Cyclic list wrap-around. */
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+ return NULL;
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+ iter->previous = iter->previous->next;
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+ return iter->previous->name;
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+}
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+
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#ifndef HAVE_INLINED_SYSCALLS
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/* Set nonzero during loading and initialization of executable and
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libraries, cleared before the executable's entry point runs. This
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@@ -1290,11 +1368,13 @@ of this helper program; chances are you did not intend to run this program.\n\
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GL(dl_rtld_map).l_tls_modid = _dl_next_tls_modid ();
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/* If we have auditing DSOs to load, do it now. */
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- if (__glibc_unlikely (audit_list != NULL))
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+ bool need_security_init = true;
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+ if (__glibc_unlikely (audit_list != NULL)
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+ || __glibc_unlikely (audit_list_string != NULL))
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{
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- /* Iterate over all entries in the list. The order is important. */
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struct audit_ifaces *last_audit = NULL;
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- struct audit_list *al = audit_list->next;
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+ struct audit_list_iter al_iter;
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+ audit_list_iter_init (&al_iter);
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/* Since we start using the auditing DSOs right away we need to
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initialize the data structures now. */
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@@ -1305,9 +1385,14 @@ of this helper program; chances are you did not intend to run this program.\n\
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use different values (especially the pointer guard) and will
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fail later on. */
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security_init ();
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+ need_security_init = false;
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- do
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+ while (true)
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{
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+ const char *name = audit_list_iter_next (&al_iter);
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+ if (name == NULL)
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+ break;
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+
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int tls_idx = GL(dl_tls_max_dtv_idx);
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/* Now it is time to determine the layout of the static TLS
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@@ -1316,7 +1401,7 @@ of this helper program; chances are you did not intend to run this program.\n\
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no DF_STATIC_TLS bit is set. The reason is that we know
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glibc will use the static model. */
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struct dlmopen_args dlmargs;
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- dlmargs.fname = al->name;
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+ dlmargs.fname = name;
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dlmargs.map = NULL;
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const char *objname;
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@@ -1329,7 +1414,7 @@ of this helper program; chances are you did not intend to run this program.\n\
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not_loaded:
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_dl_error_printf ("\
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ERROR: ld.so: object '%s' cannot be loaded as audit interface: %s; ignored.\n",
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- al->name, err_str);
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+ name, err_str);
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if (malloced)
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free ((char *) err_str);
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}
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@@ -1433,10 +1518,7 @@ ERROR: ld.so: object '%s' cannot be loaded as audit interface: %s; ignored.\n",
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goto not_loaded;
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}
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}
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-
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- al = al->next;
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}
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- while (al != audit_list->next);
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/* If we have any auditing modules, announce that we already
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have two objects loaded. */
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@@ -1700,7 +1782,7 @@ ERROR: ld.so: object '%s' cannot be loaded as audit interface: %s; ignored.\n",
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if (tcbp == NULL)
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tcbp = init_tls ();
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- if (__glibc_likely (audit_list == NULL))
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+ if (__glibc_likely (need_security_init))
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/* Initialize security features. But only if we have not done it
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earlier. */
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security_init ();
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@@ -2331,9 +2413,7 @@ process_dl_audit (char *str)
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char *p;
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while ((p = (strsep) (&str, ":")) != NULL)
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- if (p[0] != '\0'
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- && (__builtin_expect (! __libc_enable_secure, 1)
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- || strchr (p, '/') == NULL))
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+ if (dso_name_valid_for_suid (p))
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{
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/* This is using the local malloc, not the system malloc. The
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memory can never be freed. */
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@@ -2397,7 +2477,7 @@ process_envvars (enum mode *modep)
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break;
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}
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if (memcmp (envline, "AUDIT", 5) == 0)
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- process_dl_audit (&envline[6]);
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+ audit_list_string = &envline[6];
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break;
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case 7:
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--
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2.9.4
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@ -1,33 +0,0 @@ |
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From 4d009d39ac9ede0369e268554a181b428f177a80 Mon Sep 17 00:00:00 2001
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Message-Id: <4d009d39ac9ede0369e268554a181b428f177a80.1495998948.git.fweimer@redhat.com>
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In-Reply-To: <cover.1495998948.git.fweimer@redhat.com>
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References: <cover.1495998948.git.fweimer@redhat.com>
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From: Florian Weimer <fweimer@redhat.com>
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Date: Sun, 28 May 2017 20:37:40 +0200
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Subject: [PATCH 1/3] rtld: Completely ignore LD_LIBRARY_PATH for AT_SECURE=1
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programs
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To: libc-alpha@sourceware.org
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LD_LIBRARY_PATH can only be used to reorder system search paths, which
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is not useful functionality.
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---
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elf/rtld.c | 3 ++-
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1 file changed, 2 insertions(+), 1 deletion(-)
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diff --git a/elf/rtld.c b/elf/rtld.c
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index 319ef06..824b6cf 100644
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--- a/elf/rtld.c
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+++ b/elf/rtld.c
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@@ -2419,7 +2419,8 @@ process_envvars (enum mode *modep)
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case 12:
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/* The library search path. */
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- if (memcmp (envline, "LIBRARY_PATH", 12) == 0)
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+ if (!__libc_enable_secure
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+ && memcmp (envline, "LIBRARY_PATH", 12) == 0)
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{
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library_path = &envline[13];
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break;
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--
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2.9.4
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@ -1,115 +0,0 @@ |
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From 65ff0b7a085b85271ec8fde99f542281b495e3bc Mon Sep 17 00:00:00 2001
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Message-Id: <65ff0b7a085b85271ec8fde99f542281b495e3bc.1495998948.git.fweimer@redhat.com>
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In-Reply-To: <cover.1495998948.git.fweimer@redhat.com>
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References: <cover.1495998948.git.fweimer@redhat.com>
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From: Florian Weimer <fweimer@redhat.com>
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Date: Sun, 28 May 2017 20:57:40 +0200
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Subject: [PATCH 2/3] rtld: Reject overly long LD_PRELOAD path elements
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To: libc-alpha@sourceware.org
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---
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elf/rtld.c | 69 +++++++++++++++++++++++++++++++++++++++++++++++---------------
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1 file changed, 53 insertions(+), 16 deletions(-)
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diff --git a/elf/rtld.c b/elf/rtld.c
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index 824b6cf..30f0cae 100644
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--- a/elf/rtld.c
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+++ b/elf/rtld.c
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@@ -99,6 +99,22 @@ uintptr_t __pointer_chk_guard_local
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strong_alias (__pointer_chk_guard_local, __pointer_chk_guard)
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#endif
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+/* Check that AT_SECURE=0, or that the passed name does not contain
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+ directories and is not overly long. Reject empty names
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+ unconditionally. */
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+static bool
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+dso_name_valid_for_suid (const char *p)
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+{
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+ if (__glibc_unlikely (__libc_enable_secure))
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+ {
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+ /* Ignore pathnames with directories for AT_SECURE=1
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+ programs, and also skip overlong names. */
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+ size_t len = strlen (p);
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+ if (len >= NAME_MAX || memchr (p, '/', len) != NULL)
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+ return false;
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+ }
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+ return *p != '\0';
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+}
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/* List of auditing DSOs. */
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static struct audit_list
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@@ -716,6 +732,46 @@ static const char *preloadlist attribute_relro;
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/* Nonzero if information about versions has to be printed. */
|
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static int version_info attribute_relro;
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|
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+/* The LD_PRELOAD environment variable gives list of libraries
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+ separated by white space or colons that are loaded before the
|
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+ executable's dependencies and prepended to the global scope list.
|
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+ (If the binary is running setuid all elements containing a '/' are
|
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+ ignored since it is insecure.) Return the number of preloads
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+ performed. */
|
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+unsigned int
|
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+handle_ld_preload (const char *preloadlist, struct link_map *main_map)
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+{
|
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+ unsigned int npreloads = 0;
|
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+ const char *p = preloadlist;
|
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+#ifdef PATH_MAX
|
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+ char fname[PATH_MAX];
|
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+#else
|
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+ char fname[4096];
|
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+#endif
|
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+
|
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+ while (*p != '\0')
|
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+ {
|
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+ /* Split preload list at space/colon. */
|
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+ size_t len = strcspn (p, " :");
|
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+ if (len > 0 && len < sizeof(fname))
|
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+ {
|
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+ memcpy (fname, p, len);
|
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+ fname[len] = '\0';
|
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+ }
|
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+ else
|
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+ fname[0] = '\0';
|
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+
|
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+ /* Skip over the substring and the following delimiter. */
|
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+ p += len;
|
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+ if (*p == ' ' || *p == ':')
|
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+ ++p;
|
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+
|
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+ if (dso_name_valid_for_suid (fname))
|
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+ npreloads += do_preload (fname, main_map, "LD_PRELOAD");
|
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+ }
|
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+ return npreloads;
|
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+}
|
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+
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static void
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dl_main (const ElfW(Phdr) *phdr,
|
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ElfW(Word) phnum,
|
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@@ -1462,23 +1514,8 @@ ERROR: ld.so: object '%s' cannot be loaded as audit interface: %s; ignored.\n",
|
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|
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if (__glibc_unlikely (preloadlist != NULL))
|
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{
|
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- /* The LD_PRELOAD environment variable gives list of libraries
|
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- separated by white space or colons that are loaded before the
|
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- executable's dependencies and prepended to the global scope
|
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- list. If the binary is running setuid all elements
|
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- containing a '/' are ignored since it is insecure. */
|
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- char *list = strdupa (preloadlist);
|
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- char *p;
|
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-
|
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HP_TIMING_NOW (start);
|
||||
-
|
||||
- /* Prevent optimizing strsep. Speed is not important here. */
|
||||
- while ((p = (strsep) (&list, " :")) != NULL)
|
||||
- if (p[0] != '\0'
|
||||
- && (__builtin_expect (! __libc_enable_secure, 1)
|
||||
- || strchr (p, '/') == NULL))
|
||||
- npreloads += do_preload (p, main_map, "LD_PRELOAD");
|
||||
-
|
||||
+ npreloads += handle_ld_preload (preloadlist, main_map);
|
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HP_TIMING_NOW (stop);
|
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HP_TIMING_DIFF (diff, start, stop);
|
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HP_TIMING_ACCUM_NT (load_time, diff);
|
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--
|
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2.9.4
|
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|
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@ -1,23 +0,0 @@ |
||||
Fix i686 memchr overflow calculation (BZ#21182)
|
||||
|
||||
https://sourceware.org/git/?p=glibc.git;a=commit;h=3abeeec5f46ff03
|
||||
diff --git a/sysdeps/i386/i686/multiarch/memchr-sse2.S b/sysdeps/i386/i686/multiarch/memchr-sse2.S
|
||||
index 910679c..e41f324 100644
|
||||
--- a/sysdeps/i386/i686/multiarch/memchr-sse2.S
|
||||
+++ b/sysdeps/i386/i686/multiarch/memchr-sse2.S
|
||||
@@ -117,7 +117,6 @@ L(crosscache):
|
||||
|
||||
# ifndef USE_AS_RAWMEMCHR
|
||||
jnz L(match_case2_prolog1)
|
||||
- lea -16(%edx), %edx
|
||||
/* Calculate the last acceptable address and check for possible
|
||||
addition overflow by using satured math:
|
||||
edx = ecx + edx
|
||||
@@ -125,6 +124,7 @@ L(crosscache):
|
||||
add %ecx, %edx
|
||||
sbb %eax, %eax
|
||||
or %eax, %edx
|
||||
+ sub $16, %edx
|
||||
jbe L(return_null)
|
||||
lea 16(%edi), %edi
|
||||
# else
|
||||
@ -1,42 +0,0 @@ |
||||
From adc7e06fb412a2a1ee52f8cb788caf436335b9f3 Mon Sep 17 00:00:00 2001
|
||||
From: Florian Weimer <fweimer@redhat.com>
|
||||
Date: Wed, 14 Jun 2017 08:11:22 +0200
|
||||
Subject: [PATCH] i686: Add missing IS_IN (libc) guards to vectorized strcspn
|
||||
|
||||
Since commit d957c4d3fa48d685ff2726c605c988127ef99395 (i386: Compile
|
||||
rtld-*.os with -mno-sse -mno-mmx -mfpmath=387), vector intrinsics can
|
||||
no longer be used in ld.so, even if the compiled code never makes it
|
||||
into the final ld.so link. This commit adds the missing IS_IN (libc)
|
||||
guard to the SSE 4.2 strcspn implementation, so that it can be used from
|
||||
ld.so in the future.
|
||||
|
||||
(cherry picked from commit 69052a3a95da37169a08f9e59b2cc1808312753c)
|
||||
---
|
||||
ChangeLog | 5 +++++
|
||||
sysdeps/i386/i686/multiarch/strcspn-c.c | 6 ++++--
|
||||
sysdeps/i386/i686/multiarch/varshift.c | 4 +++-
|
||||
3 files changed, 12 insertions(+), 3 deletions(-)
|
||||
|
||||
diff --git a/sysdeps/i386/i686/multiarch/strcspn-c.c b/sysdeps/i386/i686/multiarch/strcspn-c.c
|
||||
index 6d61e19..ec230fb 100644
|
||||
--- a/sysdeps/i386/i686/multiarch/strcspn-c.c
|
||||
+++ b/sysdeps/i386/i686/multiarch/strcspn-c.c
|
||||
@@ -1,2 +1,4 @@
|
||||
-#define __strcspn_sse2 __strcspn_ia32
|
||||
-#include <sysdeps/x86_64/multiarch/strcspn-c.c>
|
||||
+#if IS_IN (libc)
|
||||
+# define __strcspn_sse2 __strcspn_ia32
|
||||
+# include <sysdeps/x86_64/multiarch/strcspn-c.c>
|
||||
+#endif
|
||||
diff --git a/sysdeps/i386/i686/multiarch/varshift.c b/sysdeps/i386/i686/multiarch/varshift.c
|
||||
index 7760b96..6742a35 100644
|
||||
--- a/sysdeps/i386/i686/multiarch/varshift.c
|
||||
+++ b/sysdeps/i386/i686/multiarch/varshift.c
|
||||
@@ -1 +1,3 @@
|
||||
-#include <sysdeps/x86_64/multiarch/varshift.c>
|
||||
+#if IS_IN (libc)
|
||||
+# include <sysdeps/x86_64/multiarch/varshift.c>
|
||||
+#endif
|
||||
--
|
||||
2.9.3
|
||||
|
||||
Loading…
Reference in new issue