diff options
Diffstat (limited to 'lib/darwin/execmem.c')
| -rw-r--r-- | lib/darwin/execmem.c | 14 |
1 files changed, 11 insertions, 3 deletions
diff --git a/lib/darwin/execmem.c b/lib/darwin/execmem.c index 419d7b5..d99e947 100644 --- a/lib/darwin/execmem.c +++ b/lib/darwin/execmem.c @@ -16,6 +16,7 @@ #include <stdlib.h> #include <ucontext.h> #include <signal.h> +#include <pthread.h> #define port_hash(portp) (*(portp)) #define port_eq(port1p, port2p) (*(port1p) == *(port2p)) @@ -198,6 +199,12 @@ static void resume_other_threads() { static void segfault_handler(UNUSED int sig, UNUSED siginfo_t *info, void *uap_) { + if (pthread_main_np()) { + /* The patcher itself segfaulted. Oops. Reset the signal so the + * process exits rather than going into an infinite loop. */ + signal(sig, SIG_DFL); + return; + } /* We didn't catch it before it segfaulted so have to fix it up here. */ ucontext_t *uap = uap_; apply_one_pcp_with_state(&uap->uc_mcontext->__ss, g_pc_patch_callback, @@ -311,8 +318,9 @@ int execmem_foreign_write_with_pc_patch(struct execmem_foreign_write *writes, last = first; while (last + 1 < nwrites) { - uintptr_t this_start = (uintptr_t) first_write->dst & ~PAGE_MASK; - uintptr_t this_end = ((uintptr_t) first_write->dst + + const struct execmem_foreign_write *write = &writes[last + 1]; + uintptr_t this_start = (uintptr_t) write->dst & ~PAGE_MASK; + uintptr_t this_end = ((uintptr_t) write->dst + first_write->len - 1) & ~PAGE_MASK; if (page_start <= this_start && this_start <= page_end) { if (this_end > page_end) @@ -408,7 +416,7 @@ int execmem_foreign_write_with_pc_patch(struct execmem_foreign_write *writes, /* This is probably useless, since the original page is gone * forever (intentionally, see above). May as well arrange the * deck chairs, though. */ - munmap(new, PAGE_SIZE); + munmap(new, len); goto fail; } |