From: Josh Poimboeuf <jpoimboe@redhat.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: torvalds@linux-foundation.org, tglx@linutronix.de, hpa@zytor.com,
julien.thierry@arm.com, will.deacon@arm.com, luto@amacapital.net,
mingo@kernel.org, catalin.marinas@arm.com, james.morse@arm.com,
valentin.schneider@arm.com, brgerst@gmail.com, luto@kernel.org,
bp@alien8.de, dvlasenk@redhat.com, linux-kernel@vger.kernel.org,
dvyukov@google.com, rostedt@goodmis.org
Subject: Re: [PATCH 18/20] objtool: Add UACCESS validation
Date: Mon, 11 Mar 2019 13:01:39 -0500 [thread overview]
Message-ID: <20190311180139.7mq4hkg6letzzono@treble> (raw)
In-Reply-To: <20190310131046.GI2482@worktop.programming.kicks-ass.net>
On Sun, Mar 10, 2019 at 02:10:46PM +0100, Peter Zijlstra wrote:
> On Fri, Mar 08, 2019 at 03:02:09PM -0600, Josh Poimboeuf wrote:
>
> > These gotos make my head spin. Again I would much prefer a small amount
> > of code duplication over this.
>
> something like so then?
Yeah, that looks a lot nicer to me. Thanks.
>
> --- a/tools/objtool/check.c
> +++ b/tools/objtool/check.c
> @@ -1888,6 +1888,23 @@ static inline const char *insn_dest_name
> return "{dynamic}";
> }
>
> +static int validate_call(struct instruction *insn, struct insn_state *state)
> +{
> + if (state->uaccess && !func_uaccess_safe(insn->call_dest)) {
> + WARN_FUNC("call to %s() with UACCESS enabled",
> + insn->sec, insn->offset, insn_dest_name(insn));
> + return 1;
> + }
> +
> + if (state->df) {
> + WARN_FUNC("call to %s() with DF set",
> + insn->sec, insn->offset, insn_dest_name(insn));
> + return 1;
> + }
> +
> + return 0;
> +}
> +
> /*
> * Follow the branch starting at the given instruction, and recursively follow
> * any other branches (jumps). Meanwhile, track the frame pointer state at
> @@ -2036,25 +2053,9 @@ static int validate_branch(struct objtoo
>
> case INSN_CALL:
> case INSN_CALL_DYNAMIC:
> -do_call:
> - if (state.uaccess && !func_uaccess_safe(insn->call_dest)) {
> - WARN_FUNC("call to %s() with UACCESS enabled",
> - sec, insn->offset, insn_dest_name(insn));
> - return 1;
> - }
> -
> - if (state.df) {
> - WARN_FUNC("call to %s() with DF set",
> - sec, insn->offset, insn_dest_name(insn));
> - return 1;
> - }
> -
> - if (insn->type == INSN_JUMP_UNCONDITIONAL ||
> - insn->type == INSN_JUMP_DYNAMIC)
> - return 0;
> -
> - if (insn->type == INSN_JUMP_CONDITIONAL)
> - break;
> + ret = validate_call(insn, &state);
> + if (ret)
> + return ret;
>
> if (insn->type == INSN_CALL) {
> if (is_fentry_call(insn))
> @@ -2077,13 +2078,15 @@ static int validate_branch(struct objtoo
> case INSN_JUMP_CONDITIONAL:
> case INSN_JUMP_UNCONDITIONAL:
> if (func && !insn->jump_dest) {
> -do_sibling_call:
> + /* sibling call */
> if (has_modified_stack_frame(&state)) {
> WARN_FUNC("sibling call from callable instruction with modified stack frame",
> sec, insn->offset);
> return 1;
> }
> - goto do_call;
> + ret = validate_call(insn, &state);
> + if (ret)
> + return ret;
>
> } else if (insn->jump_dest &&
> (!func || !insn->jump_dest->func ||
> @@ -2104,8 +2107,17 @@ static int validate_branch(struct objtoo
> break;
>
> case INSN_JUMP_DYNAMIC:
> - if (func && list_empty(&insn->alts))
> - goto do_sibling_call;
> + if (func && list_empty(&insn->alts)) {
> + /* sibling call */
> + if (has_modified_stack_frame(&state)) {
> + WARN_FUNC("sibling call from callable instruction with modified stack frame",
> + sec, insn->offset);
> + return 1;
> + }
> + ret = validate_call(insn, &state);
> + if (ret)
> + return ret;
> + }
>
> return 0;
>
>
--
Josh
next prev parent reply other threads:[~2019-03-11 18:01 UTC|newest]
Thread overview: 100+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-03-07 11:45 [PATCH 00/20] objtool: UACCESS validation v3 Peter Zijlstra
2019-03-07 11:45 ` [PATCH 01/20] x86/ia32: Fix ia32_restore_sigcontext AC leak Peter Zijlstra
2019-03-07 11:45 ` [PATCH 02/20] i915,uaccess: Fix redundant CLAC Peter Zijlstra
2019-03-07 11:45 ` [PATCH 03/20] x86/uaccess: Move copy_user_handle_tail into asm Peter Zijlstra
2019-03-08 18:53 ` Josh Poimboeuf
2019-03-08 19:48 ` Peter Zijlstra
2019-03-08 19:53 ` Josh Poimboeuf
2019-03-10 13:22 ` Peter Zijlstra
2019-03-07 11:45 ` [PATCH 04/20] x86/uaccess: Fix up the fixup Peter Zijlstra
2019-03-07 11:45 ` [PATCH 05/20] x86/uaccess/xen: Suppress SMAP warnings Peter Zijlstra
2019-03-07 12:22 ` Juergen Gross
2019-03-07 12:32 ` Peter Zijlstra
2019-03-07 12:36 ` Juergen Gross
2019-03-08 19:00 ` Josh Poimboeuf
2019-03-08 19:03 ` Josh Poimboeuf
2019-03-10 13:19 ` Peter Zijlstra
2019-03-11 17:59 ` Josh Poimboeuf
2019-03-08 19:50 ` Peter Zijlstra
2019-03-07 11:45 ` [PATCH 06/20] x86/uaccess: Always inline user_access_begin() Peter Zijlstra
2019-03-07 11:45 ` [PATCH 07/20] x86/uaccess: Always inline force_valid_ss() Peter Zijlstra
2019-03-07 13:50 ` Peter Zijlstra
2019-03-07 18:05 ` Andy Lutomirski
2019-03-07 18:59 ` Peter Zijlstra
2019-03-07 19:06 ` Andy Lutomirski
2019-03-07 11:45 ` [PATCH 08/20] x86/uaccess: Introduce user_access_{save,restore}() Peter Zijlstra
2019-03-07 11:45 ` [PATCH 09/20] x86/uaccess,kasan: Fix KASAN vs SMAP Peter Zijlstra
2019-03-07 11:45 ` [PATCH 10/20] x86/uaccess,ubsan: Fix UBSAN " Peter Zijlstra
2019-03-07 11:45 ` [PATCH 11/20] x86/uaccess,ftrace: Fix ftrace_likely_update() " Peter Zijlstra
2019-03-07 11:45 ` [PATCH 12/20] objtool: Set insn->func for alternatives Peter Zijlstra
2019-03-08 19:16 ` Josh Poimboeuf
2019-03-08 19:51 ` Peter Zijlstra
2019-03-07 11:45 ` [PATCH 13/20] objtool: Hande function aliases Peter Zijlstra
2019-03-08 19:23 ` Josh Poimboeuf
2019-03-08 19:52 ` Peter Zijlstra
2019-03-08 20:00 ` Josh Poimboeuf
2019-03-07 11:45 ` [PATCH 14/20] objtool: Rewrite add_ignores() Peter Zijlstra
2019-03-08 19:29 ` Josh Poimboeuf
2019-03-07 11:45 ` [PATCH 15/20] objtool: Add --backtrace support Peter Zijlstra
2019-03-08 19:33 ` Josh Poimboeuf
2019-03-07 11:45 ` [PATCH 16/20] objtool: Rewrite alt->skip_orig Peter Zijlstra
2019-03-08 20:15 ` Josh Poimboeuf
2019-03-08 21:34 ` Peter Zijlstra
2019-03-08 22:27 ` Josh Poimboeuf
2019-03-07 11:45 ` [PATCH 17/20] objtool: Fix sibling call detection Peter Zijlstra
2019-03-08 20:22 ` Josh Poimboeuf
2019-03-07 11:45 ` [PATCH 18/20] objtool: Add UACCESS validation Peter Zijlstra
2019-03-07 16:33 ` Linus Torvalds
2019-03-07 17:10 ` hpa
2019-03-07 17:41 ` Peter Zijlstra
2019-03-07 17:54 ` Linus Torvalds
2019-03-07 18:48 ` Peter Zijlstra
2019-03-07 18:51 ` hpa
2019-03-07 19:03 ` Peter Zijlstra
2019-03-08 15:01 ` Josh Poimboeuf
2019-03-08 15:07 ` Peter Zijlstra
2019-03-07 20:23 ` Peter Zijlstra
2019-03-07 20:40 ` Peter Zijlstra
2019-03-08 15:07 ` Josh Poimboeuf
2019-03-08 15:23 ` Peter Zijlstra
2019-03-07 20:15 ` Andrey Ryabinin
2019-03-07 20:33 ` Peter Zijlstra
2019-03-07 20:40 ` Andrey Ryabinin
2019-03-07 20:42 ` Peter Zijlstra
2019-03-08 21:02 ` Josh Poimboeuf
2019-03-08 21:31 ` Peter Zijlstra
2019-03-08 21:54 ` Josh Poimboeuf
2019-03-10 13:10 ` Peter Zijlstra
2019-03-11 18:01 ` Josh Poimboeuf [this message]
2019-03-07 11:45 ` [PATCH 19/20] objtool: uaccess PUSHF/POPF support Peter Zijlstra
2019-03-08 21:11 ` Josh Poimboeuf
2019-03-10 13:12 ` Peter Zijlstra
2019-03-07 11:45 ` [PATCH 20/20] objtool: Add Direction Flag validation Peter Zijlstra
2019-03-08 21:16 ` Josh Poimboeuf
2019-03-08 21:33 ` Peter Zijlstra
2019-03-08 21:56 ` Josh Poimboeuf
2019-03-10 13:13 ` Peter Zijlstra
2019-03-11 18:00 ` Josh Poimboeuf
2019-03-07 12:03 ` [PATCH 00/20] objtool: UACCESS validation v3 Peter Zijlstra
2019-03-07 12:55 ` Peter Zijlstra
2019-03-07 13:13 ` Peter Zijlstra
2019-03-07 16:47 ` Josh Poimboeuf
2019-03-07 16:50 ` Josh Poimboeuf
2019-03-07 17:00 ` Linus Torvalds
2019-03-07 17:17 ` Josh Poimboeuf
2019-03-07 17:38 ` Peter Zijlstra
2019-03-07 17:45 ` Linus Torvalds
2019-03-07 18:18 ` Steven Rostedt
2019-03-10 13:16 ` Peter Zijlstra
2019-04-19 10:08 ` [PATCH] compiler.h, tracing: Remove CONFIG_PROFILE_ALL_BRANCHES Ingo Molnar
2019-04-19 13:04 ` Steven Rostedt
2019-03-07 17:04 ` [PATCH 00/20] objtool: UACCESS validation v3 hpa
2019-03-07 17:18 ` Josh Poimboeuf
2019-03-07 17:29 ` hpa
2019-03-07 17:45 ` Josh Poimboeuf
2019-03-07 17:48 ` Linus Torvalds
2019-03-07 17:43 ` Peter Zijlstra
2019-03-07 17:48 ` Josh Poimboeuf
2019-04-03 8:21 ` [tip:core/objtool] tracing: Improve "if" macro code generation tip-bot for Josh Poimboeuf
2019-03-07 16:31 ` [PATCH 00/20] objtool: UACCESS validation v3 Linus Torvalds
2019-03-07 17:14 ` hpa
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