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authorMartin Sebor <msebor@redhat.com>2020-05-04 11:21:50 -0600
committerMartin Sebor <msebor@redhat.com>2020-05-04 11:21:50 -0600
commit06febd8c6705c816b2f32ee7aa1f4c0184b05248 (patch)
tree71586b8485abc1c6b220cb6aba340e76286b3087 /misc
parent38c67888183db1b6ac21f2f9681b8a384987dfe8 (diff)
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improve out-of-bounds checking with GCC 10 attribute access [BZ #25219]
Adds the access attribute newly introduced in GCC 10 to the subset of
function declarations that are already covered by _FORTIFY_SOURCE and
that don't have corresponding GCC built-in equivalents.

Reviewed-by: DJ Delorie <dj@redhat.com>
Diffstat (limited to 'misc')
-rw-r--r--misc/sys/cdefs.h11
1 files changed, 11 insertions, 0 deletions
diff --git a/misc/sys/cdefs.h b/misc/sys/cdefs.h
index 9fa371ab86..19d9cc5cfe 100644
--- a/misc/sys/cdefs.h
+++ b/misc/sys/cdefs.h
@@ -548,4 +548,15 @@ _Static_assert (0, "IEEE 128-bits long double requires redirection on this platf
 # define __HAVE_GENERIC_SELECTION 0
 #endif
 
+#if __GNUC_PREREQ (10, 0)
+/* Designates a 1-based positional argument ref-index of pointer type
+   that can be used to access size-index elements of the pointed-to
+   array according to access mode, or at least one element when
+   size-index is not provided:
+     access (access-mode, <ref-index> [, <size-index>])  */
+#define __attr_access(x) __attribute__ ((__access__ x))
+#else
+#  define __attr_access(x)
+#endif
+
 #endif	 /* sys/cdefs.h */