linux-toolchains.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: David Malcolm <dmalcolm@redhat.com>
To: gcc-patches@gcc.gnu.org, linux-toolchains@vger.kernel.org
Cc: David Malcolm <dmalcolm@redhat.com>
Subject: [PATCH 4a/6] analyzer: implement region::untrusted_p in terms of custom address spaces
Date: Sat, 13 Nov 2021 15:37:29 -0500	[thread overview]
Message-ID: <20211113203732.2098220-6-dmalcolm@redhat.com> (raw)
In-Reply-To: <20211113203732.2098220-1-dmalcolm@redhat.com>

gcc/analyzer/ChangeLog:
	(region::untrusted_p): New.

gcc/testsuite/ChangeLog:
	* gcc.dg/analyzer/test-uaccess.h: New header.

Signed-off-by: David Malcolm <dmalcolm@redhat.com>
---
 gcc/analyzer/region.cc                       | 13 +++++++++++++
 gcc/testsuite/gcc.dg/analyzer/test-uaccess.h | 19 +++++++++++++++++++
 2 files changed, 32 insertions(+)
 create mode 100644 gcc/testsuite/gcc.dg/analyzer/test-uaccess.h

diff --git a/gcc/analyzer/region.cc b/gcc/analyzer/region.cc
index bb4f53b8802..b84504dbe42 100644
--- a/gcc/analyzer/region.cc
+++ b/gcc/analyzer/region.cc
@@ -666,6 +666,19 @@ region::symbolic_for_unknown_ptr_p () const
   return false;
 }
 
+/* Return true if accessing this region crosses a trust boundary
+   e.g. user-space memory as seen by an OS kernel.  */
+
+bool
+region::untrusted_p () const
+{
+  addr_space_t as = get_addr_space ();
+  /* FIXME: treat all non-generic address spaces as untrusted for now.  */
+  if (!ADDR_SPACE_GENERIC_P (as))
+    return true;
+  return false;
+}
+
 /* region's ctor.  */
 
 region::region (complexity c, unsigned id, const region *parent, tree type)
diff --git a/gcc/testsuite/gcc.dg/analyzer/test-uaccess.h b/gcc/testsuite/gcc.dg/analyzer/test-uaccess.h
new file mode 100644
index 00000000000..0500e20b22b
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/analyzer/test-uaccess.h
@@ -0,0 +1,19 @@
+/* Shared header for testcases for copy_from_user/copy_to_user.  */
+
+/* Adapted from include/linux/compiler.h  */
+
+#pragma GCC custom_address_space(__user)
+
+/* Adapted from include/asm-generic/uaccess.h  */
+
+extern int copy_from_user(void *to, const void __user *from, long n)
+  __attribute__((access (write_only, 1, 3),
+		 access (read_only, 2, 3),
+		 returns_zero_on_success
+		 ));
+
+extern long copy_to_user(void __user *to, const void *from, unsigned long n)
+  __attribute__((access (write_only, 1, 3),
+		 access (read_only, 2, 3),
+		 returns_zero_on_success
+		 ));
-- 
2.26.3


  parent reply	other threads:[~2021-11-13 20:37 UTC|newest]

Thread overview: 39+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-11-13 20:37 [PATCH 0/6] RFC: adding support to GCC for detecting trust boundaries David Malcolm
2021-11-13 20:37 ` [PATCH 1a/6] RFC: Implement "#pragma GCC custom_address_space" David Malcolm
2021-11-13 20:37 ` [PATCH 1b/6] Add __attribute__((untrusted)) David Malcolm
2021-12-09 22:54   ` Martin Sebor
2022-01-06 15:10     ` David Malcolm
2022-01-06 18:59       ` Martin Sebor
2021-11-13 20:37 ` [PATCH 2/6] Add returns_zero_on_success/failure attributes David Malcolm
2021-11-15  7:03   ` Prathamesh Kulkarni
2021-11-15 14:45     ` Peter Zijlstra
2021-11-15 22:30       ` David Malcolm
2021-11-15 22:12     ` David Malcolm
2021-11-17  9:23       ` Prathamesh Kulkarni
2021-11-17 22:43         ` Joseph Myers
2021-11-18 20:08           ` Segher Boessenkool
2021-11-18 23:45             ` David Malcolm
2021-11-19 21:52               ` Segher Boessenkool
2021-11-18 23:34           ` David Malcolm
2021-12-06 18:34             ` Martin Sebor
2021-11-18 23:15         ` David Malcolm
2021-11-13 20:37 ` David Malcolm [this message]
2021-11-13 20:37 ` [PATCH 4b/6] analyzer: implement region::untrusted_p in terms of __attribute__((untrusted)) David Malcolm
2021-11-13 20:37 ` [PATCH 5/6] analyzer: use region::untrusted_p in taint detection David Malcolm
2021-11-13 20:37 ` [PATCH 6/6] Add __attribute__ ((tainted)) David Malcolm
2022-01-06 14:08   ` PING (C/C++): " David Malcolm
2022-01-10 21:36     ` PING^2 " David Malcolm
2022-01-12  4:36       ` Jason Merrill
2022-01-12 15:33         ` David Malcolm
2022-01-13 19:08           ` Jason Merrill
2022-01-14  1:25             ` [committed] Add __attribute__ ((tainted_args)) David Malcolm
2021-11-13 23:20 ` [PATCH 0/6] RFC: adding support to GCC for detecting trust boundaries Peter Zijlstra
2021-11-14  2:54   ` David Malcolm
2021-11-14 13:54 ` Miguel Ojeda
2021-12-06 18:12 ` Martin Sebor
2021-12-06 19:40   ` Segher Boessenkool
2021-12-09  0:06     ` David Malcolm
2021-12-09  0:41       ` Segher Boessenkool
2021-12-09 16:42     ` Martin Sebor
2021-12-09 23:40       ` Segher Boessenkool
2021-12-08 23:11   ` David Malcolm

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20211113203732.2098220-6-dmalcolm@redhat.com \
    --to=dmalcolm@redhat.com \
    --cc=gcc-patches@gcc.gnu.org \
    --cc=linux-toolchains@vger.kernel.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).