[PATCH] tree-inline: Remove .ASAN_MARK calls when inlining functions into no_sanitize callers [PR114956]

[Jakub Jelinek]

Hi!

In r9-5742 we've started allowing to inline always_inline functions into
functions which have disabled e.g. address sanitization even when the
always_inline function is implicitly from command line options sanitized.

This mostly works fine because most of the asan instrumentation is done only
late after ipa, but as the following testcase the .ASAN_MARK ifn calls
gimplifier adds can result in ICEs.

Fixed by dropping those during inlining, similarly to how we drop
.TSAN_FUNC_EXIT calls.

Bootstrapped/regtested on x86_64-linux and i686-linux, ok for trunk?

2024-05-07  Jakub Jelinek  

PR sanitizer/114956
* tree-inline.cc: Include asan.h.
(copy_bb): Remove also .ASAN_MARK calls if id->dst_fn has asan/hwasan
sanitization disabled.

* gcc.dg/asan/pr114956.c: New test.

--- gcc/tree-inline.cc.jj   2024-05-03 09:44:21.199055899 +0200
+++ gcc/tree-inline.cc  2024-05-06 10:45:37.231349328 +0200
@@ -65,6 +65,7 @@ along with GCC; see the file COPYING3.
 #include "symbol-summary.h"
 #include "symtab-thunks.h"
 #include "symtab-clones.h"
+#include "asan.h"
 
 /* I'm not real happy about this, but we need to handle gimple and
non-gimple trees.  */
@@ -2226,13 +2227,26 @@ copy_bb (copy_body_data *id, basic_block
}
  else if (call_stmt
   && id->call_stmt
-  && gimple_call_internal_p (stmt)
-  && gimple_call_internal_fn (stmt) == IFN_TSAN_FUNC_EXIT)
-   {
- /* Drop TSAN_FUNC_EXIT () internal calls during inlining.  */
- gsi_remove (©_gsi, false);
- continue;
-   }
+  && gimple_call_internal_p (stmt))
+   switch (gimple_call_internal_fn (stmt))
+ {
+ case IFN_TSAN_FUNC_EXIT:
+   /* Drop .TSAN_FUNC_EXIT () internal calls during inlining.  */
+   gsi_remove (©_gsi, false);
+   continue;
+ case IFN_ASAN_MARK:
+   /* Drop .ASAN_MARK internal calls during inlining into
+  no_sanitize functions.  */
+   if (!sanitize_flags_p (SANITIZE_ADDRESS, id->dst_fn)
+   && !sanitize_flags_p (SANITIZE_HWADDRESS, id->dst_fn))
+ {
+   gsi_remove (©_gsi, false);
+   continue;
+ }
+   break;
+ default:
+   break;
+ }
 
  /* Statements produced by inlining can be unfolded, especially
 when we constant propagated some operands.  We can't fold
--- gcc/testsuite/gcc.dg/asan/pr114956.c.jj 2024-05-06 10:54:52.601892840 
+0200
+++ gcc/testsuite/gcc.dg/asan/pr114956.c2024-05-06 10:54:33.920143734 
+0200
@@ -0,0 +1,26 @@
+/* PR sanitizer/114956 */
+/* { dg-do compile } */
+/* { dg-options "-O2 -fsanitize=address,null" } */
+
+int **a;
+void qux (int *);
+
+__attribute__((always_inline)) static inline int *
+foo (void)
+{
+  int b[1];
+  qux (b);
+  return a[1];
+}
+
+__attribute__((no_sanitize_address)) void
+bar (void)
+{
+  *a = foo ();
+}
+
+void
+baz (void)
+{
+  bar ();
+}

Jakub

Re: [PATCH] tree-inline: Remove .ASAN_MARK calls when inlining functions into no_sanitize callers [PR114956]

[Richard Biener]

> Am 07.05.2024 um 17:54 schrieb Jakub Jelinek :
> 
> Hi!
> 
> In r9-5742 we've started allowing to inline always_inline functions into
> functions which have disabled e.g. address sanitization even when the
> always_inline function is implicitly from command line options sanitized.
> 
> This mostly works fine because most of the asan instrumentation is done only
> late after ipa, but as the following testcase the .ASAN_MARK ifn calls
> gimplifier adds can result in ICEs.
> 
> Fixed by dropping those during inlining, similarly to how we drop
> .TSAN_FUNC_EXIT calls.
> 
> Bootstrapped/regtested on x86_64-linux and i686-linux, ok for trunk?

Ok

Richard 

> 2024-05-07  Jakub Jelinek  
> 
>PR sanitizer/114956
>* tree-inline.cc: Include asan.h.
>(copy_bb): Remove also .ASAN_MARK calls if id->dst_fn has asan/hwasan
>sanitization disabled.
> 
>* gcc.dg/asan/pr114956.c: New test.
> 
> --- gcc/tree-inline.cc.jj2024-05-03 09:44:21.199055899 +0200
> +++ gcc/tree-inline.cc2024-05-06 10:45:37.231349328 +0200
> @@ -65,6 +65,7 @@ along with GCC; see the file COPYING3.
> #include "symbol-summary.h"
> #include "symtab-thunks.h"
> #include "symtab-clones.h"
> +#include "asan.h"
> 
> /* I'm not real happy about this, but we need to handle gimple and
>non-gimple trees.  */
> @@ -2226,13 +2227,26 @@ copy_bb (copy_body_data *id, basic_block
>}
>  else if (call_stmt
>   && id->call_stmt
> -   && gimple_call_internal_p (stmt)
> -   && gimple_call_internal_fn (stmt) == IFN_TSAN_FUNC_EXIT)
> -{
> -  /* Drop TSAN_FUNC_EXIT () internal calls during inlining.  */
> -  gsi_remove (©_gsi, false);
> -  continue;
> -}
> +   && gimple_call_internal_p (stmt))
> +switch (gimple_call_internal_fn (stmt))
> +  {
> +  case IFN_TSAN_FUNC_EXIT:
> +/* Drop .TSAN_FUNC_EXIT () internal calls during inlining.  */
> +gsi_remove (©_gsi, false);
> +continue;
> +  case IFN_ASAN_MARK:
> +/* Drop .ASAN_MARK internal calls during inlining into
> +   no_sanitize functions.  */
> +if (!sanitize_flags_p (SANITIZE_ADDRESS, id->dst_fn)
> +&& !sanitize_flags_p (SANITIZE_HWADDRESS, id->dst_fn))
> +  {
> +gsi_remove (©_gsi, false);
> +continue;
> +  }
> +break;
> +  default:
> +break;
> +  }
> 
>  /* Statements produced by inlining can be unfolded, especially
> when we constant propagated some operands.  We can't fold
> --- gcc/testsuite/gcc.dg/asan/pr114956.c.jj2024-05-06 10:54:52.601892840 
> +0200
> +++ gcc/testsuite/gcc.dg/asan/pr114956.c2024-05-06 10:54:33.920143734 
> +0200
> @@ -0,0 +1,26 @@
> +/* PR sanitizer/114956 */
> +/* { dg-do compile } */
> +/* { dg-options "-O2 -fsanitize=address,null" } */
> +
> +int **a;
> +void qux (int *);
> +
> +__attribute__((always_inline)) static inline int *
> +foo (void)
> +{
> +  int b[1];
> +  qux (b);
> +  return a[1];
> +}
> +
> +__attribute__((no_sanitize_address)) void
> +bar (void)
> +{
> +  *a = foo ();
> +}
> +
> +void
> +baz (void)
> +{
> +  bar ();
> +}
> 
>Jakub
>