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[RFC,v2,19/22] aarch64: Ignore GCS property of ld.so

Message ID 20241018100014.2955664-1-yury.khrustalev@arm.com
State New
Headers show
Series aarch64: Add support for Guarded Control Stack extension | expand

Commit Message

Yury Khrustalev Oct. 18, 2024, 10 a.m. UTC 
From: Szabolcs Nagy <szabolcs.nagy@arm.com>

check_gcs is called for each dependency of a DSO, but the GNU property
of the ld.so is not processed so ldso->l_mach.gcs may not be correct.
Just assume ld.so is GCS compatible independently of the ELF marking.
---
 sysdeps/aarch64/dl-gcs.c | 5 +++++
 1 file changed, 5 insertions(+)
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Patch

diff --git a/sysdeps/aarch64/dl-gcs.c b/sysdeps/aarch64/dl-gcs.c
index 764b8a56e9..b81aa30787 100644
--- a/sysdeps/aarch64/dl-gcs.c
+++ b/sysdeps/aarch64/dl-gcs.c
@@ -32,6 +32,11 @@  fail (struct link_map *l, const char *program)
 static void
 check_gcs (struct link_map *l, const char *program)
 {
+#ifdef SHARED
+  /* Ignore GCS marking on ld.so: its properties are not processed.  */
+  if (l->l_real == &GL(dl_rtld_map))
+    return;
+#endif
   if (!l->l_mach.gcs)
     {
       if (GLRO(dl_aarch64_gcs_policy) == 2 || !program)