support setting of default thread stack size via PT_GNU_STACK header

[musl] / ldso / dynlink.c

diff --git a/ldso/dynlink.c b/ldso/dynlink.c
index e4829c3..3ecbddf 100644 (file)
--- a/ldso/dynlink.c
+++ b/ldso/dynlink.c
@@ -609,6 +609,12 @@ static void *map_library(int fd, struct dso *dso)
                } else if (ph->p_type == PT_GNU_RELRO) {
                        dso->relro_start = ph->p_vaddr & -PAGE_SIZE;
                        dso->relro_end = (ph->p_vaddr + ph->p_memsz) & -PAGE_SIZE;
+               } else if (ph->p_type == PT_GNU_STACK) {
+                       if (!runtime && ph->p_memsz > __default_stacksize) {
+                               __default_stacksize =
+                                       ph->p_memsz < DEFAULT_STACK_MAX ?
+                                       ph->p_memsz : DEFAULT_STACK_MAX;
+                       }
                }
                if (ph->p_type != PT_LOAD) continue;
                nsegs++;
@@ -1238,6 +1244,12 @@ static void kernel_mapped_dso(struct dso *p)
                } else if (ph->p_type == PT_GNU_RELRO) {
                        p->relro_start = ph->p_vaddr & -PAGE_SIZE;
                        p->relro_end = (ph->p_vaddr + ph->p_memsz) & -PAGE_SIZE;
+               } else if (ph->p_type == PT_GNU_STACK) {
+                       if (!runtime && ph->p_memsz > __default_stacksize) {
+                               __default_stacksize =
+                                       ph->p_memsz < DEFAULT_STACK_MAX ?
+                                       ph->p_memsz : DEFAULT_STACK_MAX;
+                       }
                }
                if (ph->p_type != PT_LOAD) continue;
                if (ph->p_vaddr < min_addr)