diff options
Diffstat (limited to 'nptl')
| -rw-r--r-- | nptl/allocatestack.c | 2 | ||||
| -rw-r--r-- | nptl/descr.h | 3 | ||||
| -rw-r--r-- | nptl/pthread_create.c | 5 |
3 files changed, 10 insertions, 0 deletions
diff --git a/nptl/allocatestack.c b/nptl/allocatestack.c index 2cb562f8ea..d9adb5856c 100644 --- a/nptl/allocatestack.c +++ b/nptl/allocatestack.c @@ -132,6 +132,8 @@ get_cached_stack (size_t *sizep, void **memp) __libc_lock_init (result->exit_lock); memset (&result->tls_state, 0, sizeof result->tls_state); + result->getrandom_buf = NULL; + /* Clear the DTV. */ dtv_t *dtv = GET_DTV (TLS_TPADJ (result)); for (size_t cnt = 0; cnt < dtv[-1].counter; ++cnt) diff --git a/nptl/descr.h b/nptl/descr.h index 65d3baaee3..989995262b 100644 --- a/nptl/descr.h +++ b/nptl/descr.h @@ -404,6 +404,9 @@ struct pthread /* Used on strsignal. */ struct tls_internal_t tls_state; + /* getrandom vDSO per-thread opaque state. */ + void *getrandom_buf; + /* rseq area registered with the kernel. Use a custom definition here to isolate from kernel struct rseq changes. The implementation of sched_getcpu needs acccess to the cpu_id field; diff --git a/nptl/pthread_create.c b/nptl/pthread_create.c index 1d3665d5ed..ef3ec33290 100644 --- a/nptl/pthread_create.c +++ b/nptl/pthread_create.c @@ -38,6 +38,7 @@ #include <version.h> #include <clone_internal.h> #include <futex-internal.h> +#include <getrandom-internal.h> #include <shlib-compat.h> @@ -549,6 +550,10 @@ start_thread (void *arg) } #endif + /* Release the vDSO getrandom per-thread buffer with all signal blocked, + to avoid creating a new free-state block during thread release. */ + __getrandom_vdso_release (pd); + if (!pd->user_stack) advise_stack_range (pd->stackblock, pd->stackblock_size, (uintptr_t) pd, pd->guardsize); |