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authorAlexandre Oliva <aoliva@redhat.com>2017-02-03 20:35:16 -0500
committerCarlos O'Donell <carlos@systemhalted.org>2017-02-03 21:34:14 -0500
commitd675eaf7d99096a952c1d140abfed82c939fb259 (patch)
treeaa4d46c8e5d704b3a8dfa8b38765e2710adccff2 /nptl
parent33d7e138ca63b4091bba840c609a95cdcc56c10e (diff)
downloadglibc-d675eaf7d99096a952c1d140abfed82c939fb259.tar.gz
Bug 20915: Do not initialize DTV of other threads.
In _dl_nothread_init_static_tls() and init_one_static_tls() we must not touch the DTV of other threads since we do not have ownership of them. The DTV need not be initialized at this point anyway since only LD/GD accesses will use them. If LD/GD accesses occur they will take care to initialize their own thread's DTV. Concurrency comments were removed from the patch since they need to be reworked along with a full description of DTV ownership and when it is or is not safe to modify these structures. Alexandre Oliva's original patch and discussion: https://sourceware.org/ml/libc-alpha/2016-09/msg00512.html
Diffstat (limited to 'nptl')
-rw-r--r--nptl/allocatestack.c5
1 files changed, 0 insertions, 5 deletions
diff --git a/nptl/allocatestack.c b/nptl/allocatestack.c
index 6402ea43f2..8a228ab254 100644
--- a/nptl/allocatestack.c
+++ b/nptl/allocatestack.c
@@ -1191,11 +1191,6 @@ init_one_static_tls (struct pthread *curp, struct link_map *map)
# error "Either TLS_TCB_AT_TP or TLS_DTV_AT_TP must be defined"
# endif
- /* Fill in the DTV slot so that a later LD/GD access will find it. */
- dtv_t *dtv = GET_DTV (TLS_TPADJ (curp));
- dtv[map->l_tls_modid].pointer.to_free = NULL;
- dtv[map->l_tls_modid].pointer.val = dest;
-
/* Initialize the memory. */
memset (__mempcpy (dest, map->l_tls_initimage, map->l_tls_initimage_size),
'\0', map->l_tls_blocksize - map->l_tls_initimage_size);