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[v3,20/23] aarch64: Process gnu properties in static exe

Message ID 20241023083920.466015-21-yury.khrustalev@arm.com
State New
Headers show
Series aarch64: Add support for Guarded Control Stack extension | expand

Commit Message

Yury Khrustalev Oct. 23, 2024, 8:39 a.m. UTC 
From: Szabolcs Nagy <szabolcs.nagy@arm.com>

Unlike for BTI, the kernel does not process GCS properties so update
GL(dl_aarch64_gcs) before the GCS status is set.
---
 sysdeps/unix/sysv/linux/aarch64/libc-start.h | 12 ++++++++++++
 1 file changed, 12 insertions(+)
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Patch

diff --git a/sysdeps/unix/sysv/linux/aarch64/libc-start.h b/sysdeps/unix/sysv/linux/aarch64/libc-start.h
index 0dd102c374..1cc4dab818 100644
--- a/sysdeps/unix/sysv/linux/aarch64/libc-start.h
+++ b/sysdeps/unix/sysv/linux/aarch64/libc-start.h
@@ -21,6 +21,8 @@ 
 
 #ifndef SHARED
 
+# include <dl-prop.h>
+
 # ifndef PR_SET_SHADOW_STACK_STATUS
 #  define PR_GET_SHADOW_STACK_STATUS	74
 #  define PR_SET_SHADOW_STACK_STATUS	75
@@ -36,6 +38,16 @@  aarch64_libc_setup_tls (void)
 {
   __libc_setup_tls ();
 
+  struct link_map *main_map = _dl_get_dl_main_map ();
+  const ElfW(Phdr) *phdr = GL(dl_phdr);
+  const ElfW(Phdr) *ph;
+  for (ph = phdr; ph < phdr + GL(dl_phnum); ph++)
+    if (ph->p_type == PT_GNU_PROPERTY)
+      {
+	_dl_process_pt_gnu_property (main_map, -1, ph);
+	_rtld_main_check (main_map, _dl_argv[0]);
+	break;
+      }
   uint64_t s = GL(dl_aarch64_gcs);
   if (s != 0)
     INLINE_SYSCALL_CALL (prctl, PR_SET_SHADOW_STACK_STATUS, s, 0, 0, 0);