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* [glibc/arm/morello/main] TODO(relro): cheri: make __attribute_relro a nop
@ 2022-08-05 19:33 Szabolcs Nagy
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From: Szabolcs Nagy @ 2022-08-05 19:33 UTC (permalink / raw)
To: glibc-cvs
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=347f7e2ac1f34f92bc382afe9e5fe32ebe7cf16c
commit 347f7e2ac1f34f92bc382afe9e5fe32ebe7cf16c
Author: Szabolcs Nagy <szabolcs.nagy@arm.com>
Date: Thu Jun 10 16:10:15 2021 +0100
TODO(relro): cheri: make __attribute_relro a nop
relro does not work in the libc, because capabilities are readonly
even before the page protection is applied.
Diff:
---
include/libc-symbols.h | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/include/libc-symbols.h b/include/libc-symbols.h
index f4437ff6ad..1a7df359fd 100644
--- a/include/libc-symbols.h
+++ b/include/libc-symbols.h
@@ -426,8 +426,12 @@ for linking")
#define attribute_tls_model_ie __attribute__ ((tls_model ("initial-exec")))
+#if defined __CHERI_PURE_CAPABILITY__
+/* avoid readonly caps at startup when relro has to be writable */
+#define attribute_relro
+#else
#define attribute_relro __attribute__ ((section (".data.rel.ro")))
-
+#endif
/* Used to disable stack protection in sensitive places, like ifunc
resolvers and early static TLS init. */
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