diff options
Diffstat (limited to 'sysdeps')
| -rw-r--r-- | sysdeps/generic/ldsodefs.h | 14 | ||||
| -rw-r--r-- | sysdeps/x86_64/dl-tls.c | 5 |
2 files changed, 18 insertions, 1 deletions
diff --git a/sysdeps/generic/ldsodefs.h b/sysdeps/generic/ldsodefs.h index 50f58a60e3..656e8a3fa0 100644 --- a/sysdeps/generic/ldsodefs.h +++ b/sysdeps/generic/ldsodefs.h @@ -1256,6 +1256,20 @@ extern struct link_map *_dl_update_slotinfo (unsigned long int req_modid, size_t gen) attribute_hidden; +/* The last TLS module ID that is initially loaded, plus 1. TLS + addresses for modules with IDs lower than that can be obtained from + the DTV even if its generation is outdated. */ +extern size_t _dl_tls_initial_modid_limit attribute_hidden attribute_relro; + +/* Compute _dl_tls_initial_modid_limit. To be called after initial + relocation. */ +void _dl_tls_initial_modid_limit_setup (void) attribute_hidden; + +/* Number of threads currently in a TLS update. This is used to + detect reentrant __tls_get_addr calls without a per-thread + flag. */ +extern unsigned int _dl_tls_threads_in_update attribute_hidden; + /* Look up the module's TLS block as for __tls_get_addr, but never touch anything. Return null if it's not allocated yet. */ extern void *_dl_tls_get_addr_soft (struct link_map *l) attribute_hidden; diff --git a/sysdeps/x86_64/dl-tls.c b/sysdeps/x86_64/dl-tls.c index 869023bbba..b3c1e4fcd7 100644 --- a/sysdeps/x86_64/dl-tls.c +++ b/sysdeps/x86_64/dl-tls.c @@ -41,7 +41,10 @@ __tls_get_addr_slow (GET_ADDR_ARGS) dtv_t *dtv = THREAD_DTV (); size_t gen = atomic_load_acquire (&GL(dl_tls_generation)); - if (__glibc_unlikely (dtv[0].counter != gen)) + if (__glibc_unlikely (dtv[0].counter != gen) + /* See comment in __tls_get_addr in elf/dl-tls.c. */ + && !(_dl_tls_allocate_active () + && GET_ADDR_MODULE < _dl_tls_initial_modid_limit)) return update_get_addr (GET_ADDR_PARAM, gen); return tls_get_addr_tail (GET_ADDR_PARAM, dtv, NULL); |