Hi!
As seen in the issue, we try to instrument a global variable that contains a
string
constant. Following patch does not instrument in the size is variable (VLA).
Patch survives regression tests and bootstraps on x86_64-linux.
It's questionable whether the same situation can also happen in
asan_finish_file:
FOR_EACH_DEFINED_VARIABLE (vnode)
if (TREE_ASM_WRITTEN (vnode->decl)
&& asan_protect_global (vnode->decl))
asan_add_global (vnode->decl, TREE_TYPE (type), v);
?
Ready to be installed?
Thanks,
Martin
>From 341129d1277cacdee7bcd2129ad8282d9319b11d Mon Sep 17 00:00:00 2001
From: marxin <mli...@suse.cz>
Date: Fri, 3 Jun 2016 10:23:57 +0200
Subject: [PATCH] Do not instrument string cst w/ unknown decl size (PR
sanitizer/71378)
gcc/ChangeLog:
2016-06-03 Martin Liska <mli...@suse.cz>
* asan.c (add_string_csts): Instrument just string csts with a
known decl size.
gcc/testsuite/ChangeLog:
2016-06-03 Martin Liska <mli...@suse.cz>
* g++.dg/asan/pr71378.C: New test.
---
gcc/asan.c | 6 ++++--
gcc/testsuite/g++.dg/asan/pr71378.C | 11 +++++++++++
2 files changed, 15 insertions(+), 2 deletions(-)
create mode 100644 gcc/testsuite/g++.dg/asan/pr71378.C
diff --git a/gcc/asan.c b/gcc/asan.c
index 71095fb..0dae480 100644
--- a/gcc/asan.c
+++ b/gcc/asan.c
@@ -2474,8 +2474,10 @@ add_string_csts (constant_descriptor_tree **slot,
&& TREE_ASM_WRITTEN (desc->value)
&& asan_protect_global (desc->value))
{
- asan_add_global (SYMBOL_REF_DECL (XEXP (desc->rtl, 0)),
- aascd->type, aascd->v);
+ tree symbol = SYMBOL_REF_DECL (XEXP (desc->rtl, 0));
+
+ if (tree_fits_uhwi_p (DECL_SIZE_UNIT (symbol)))
+ asan_add_global (symbol, aascd->type, aascd->v);
}
return 1;
}
diff --git a/gcc/testsuite/g++.dg/asan/pr71378.C b/gcc/testsuite/g++.dg/asan/pr71378.C
new file mode 100644
index 0000000..166eae1
--- /dev/null
+++ b/gcc/testsuite/g++.dg/asan/pr71378.C
@@ -0,0 +1,11 @@
+/* { dg-do compile } */
+
+class A {
+public:
+ int GetLen();
+};
+class B {
+ A s_MDSPartIDStr;
+ void FillLoadPartitionInfo();
+};
+void B::FillLoadPartitionInfo() { char a[s_MDSPartIDStr.GetLen()] = "foo"; }
--
2.8.3
