diff options
Diffstat (limited to 'lib/darwin/execmem.c')
| -rw-r--r-- | lib/darwin/execmem.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/lib/darwin/execmem.c b/lib/darwin/execmem.c index 666fa8a..0155b1f 100644 --- a/lib/darwin/execmem.c +++ b/lib/darwin/execmem.c @@ -402,9 +402,10 @@ int execmem_foreign_write_with_pc_patch(struct execmem_foreign_write *writes, * hook one of them. (This includes the mmap, since there's an epilog * after the actual syscall instruction.) * This includes the signal handler! */ - if (manual_mmap((void *) page_start, len, PROT_NONE, - MAP_ANON | MAP_SHARED | MAP_FIXED, -1, 0) - == MAP_FAILED) { + void *mmret = manual_mmap((void *) page_start, len, PROT_NONE, + MAP_ANON | MAP_SHARED | MAP_FIXED, -1, 0); + /* MAP_FAILED is a userspace construct */ + if ((uintptr_t) mmret & 0xfff) { ret = SUBSTITUTE_ERR_VM; goto fail_unmap; } |