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objtool: Fix ORC vs alternatives

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Jann reported that (for instance) entry_64.o:general_protection has
very odd ORC data:

  0000000000000f40 <general_protection>:
  #######sp:sp+8 bp:(und) type:iret end:0
    f40:       90                      nop
  #######sp:(und) bp:(und) type:call end:0
    f41:       90                      nop
    f42:       90                      nop
  #######sp:sp+8 bp:(und) type:iret end:0
    f43:       e8 a8 01 00 00          callq  10f0 <error_entry>
  #######sp:sp+0 bp:(und) type:regs end:0
    f48:       f6 84 24 88 00 00 00    testb  $0x3,0x88(%rsp)
    f4f:       03
    f50:       74 00                   je     f52 <general_protection+0x12>
    f52:       48 89 e7                mov    %rsp,%rdi
    f55:       48 8b 74 24 78          mov    0x78(%rsp),%rsi
    f5a:       48 c7 44 24 78 ff ff    movq   $0xffffffffffffffff,0x78(%rsp)
    f61:       ff ff
    f63:       e8 00 00 00 00          callq  f68 <general_protection+0x28>
    f68:       e9 73 02 00 00          jmpq   11e0 <error_exit>
  #######sp:(und) bp:(und) type:call end:0
    f6d:       0f 1f 00                nopl   (%rax)

Note the entry at 0xf41. Josh found this was the result of commit:

  764eef4b10 ("objtool: Rewrite alt->skip_orig")

Due to the early return in validate_branch() we no longer set
insn->cfi of the original instruction stream (the NOPs at 0xf41 and
0xf42) and we'll end up with the above weirdness.

In other discussions we realized alternatives should be ORC invariant;
that is, due to there being only a single ORC table, it must be valid
for all alternatives. The easiest way to ensure this is to not allow
any stack modifications in alternatives.

When we enforce this latter observation, we get the property that the
whole alternative must have the same CFI, which we can employ to fix
the former report.

Fixes: 764eef4b10 ("objtool: Rewrite alt->skip_orig")
Reported-by: Jann Horn <jannh@google.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Miroslav Benes <mbenes@suse.cz>
Acked-by: Josh Poimboeuf <jpoimboe@redhat.com>
Link: https://lkml.kernel.org/r/20200428191659.499074346@infradead.org
This commit is contained in:
Peter Zijlstra 2020-04-28 19:37:01 +02:00
parent 13fab06d9a
commit 7117f16bf4
2 changed files with 40 additions and 1 deletions
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7
tools/objtool/Documentation/stack-validation.txt
View File

@ -315,6 +315,13 @@ they mean, and suggestions for how to fix them.
function tracing inserts additional calls, which is not obvious from the
sources).
10. file.o: warning: func()+0x5c: alternative modifies stack
This means that an alternative includes instructions that modify the
stack. The problem is that there is only one ORC unwind table, this means
that the ORC unwind entries must be valid for each of the alternatives.
The easiest way to enforce this is to ensure alternatives do not contain
any ORC entries, which in turn implies the above constraint.
If the error doesn't seem to make sense, it could be a bug in objtool.
Feel free to ask the objtool maintainer for help.

34
tools/objtool/check.c
View File

@ -1983,6 +1983,11 @@ static int handle_insn_ops(struct instruction *insn, struct insn_state *state)
list_for_each_entry(op, &insn->stack_ops, list) {
int res;
if (insn->alt_group) {
WARN_FUNC("alternative modifies stack", insn->sec, insn->offset);
return -1;
}
res = update_cfi_state(insn, &state->cfi, op);
if (res)
return res;
@ -2149,6 +2154,30 @@ static int validate_return(struct symbol *func, struct instruction *insn, struct
return 0;
}
/*
* Alternatives should not contain any ORC entries, this in turn means they
* should not contain any CFI ops, which implies all instructions should have
* the same same CFI state.
*
* It is possible to constuct alternatives that have unreachable holes that go
* unreported (because they're NOPs), such holes would result in CFI_UNDEFINED
* states which then results in ORC entries, which we just said we didn't want.
*
* Avoid them by copying the CFI entry of the first instruction into the whole
* alternative.
*/
static void fill_alternative_cfi(struct objtool_file *file, struct instruction *insn)
{
struct instruction *first_insn = insn;
int alt_group = insn->alt_group;
sec_for_each_insn_continue(file, insn) {
if (insn->alt_group != alt_group)
break;
insn->cfi = first_insn->cfi;
}
}
/*
* Follow the branch starting at the given instruction, and recursively follow
* any other branches (jumps). Meanwhile, track the frame pointer state at
@ -2200,7 +2229,7 @@ static int validate_branch(struct objtool_file *file, struct symbol *func,
insn->visited |= visited;
if (!insn->ignore_alts) {
if (!insn->ignore_alts && !list_empty(&insn->alts)) {
bool skip_orig = false;
list_for_each_entry(alt, &insn->alts, list) {
@ -2215,6 +2244,9 @@ static int validate_branch(struct objtool_file *file, struct symbol *func,
}
}
if (insn->alt_group)
fill_alternative_cfi(file, insn);
if (skip_orig)
return 0;
}