[tip: objtool/urgent] objtool: Properly disable uaccess validation
From: tip-bot2 for Josh Poimboeuf
Date: Tue Mar 25 2025 - 04:37:32 EST
The following commit has been merged into the objtool/urgent branch of tip:
Commit-ID: e1a9dda74dbffbc3fa2069ff418a1876dc99fb14
Gitweb: https://git.kernel.org/tip/e1a9dda74dbffbc3fa2069ff418a1876dc99fb14
Author: Josh Poimboeuf <jpoimboe@xxxxxxxxxx>
AuthorDate: Mon, 24 Mar 2025 14:55:58 -07:00
Committer: Ingo Molnar <mingo@xxxxxxxxxx>
CommitterDate: Tue, 25 Mar 2025 09:20:26 +01:00
objtool: Properly disable uaccess validation
If opts.uaccess isn't set, the uaccess validation is disabled, but only
partially: it doesn't read the uaccess_safe_builtin list but still tries
to do the validation. Disable it completely to prevent false warnings.
Signed-off-by: Josh Poimboeuf <jpoimboe@xxxxxxxxxx>
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/0e95581c1d2107fb5f59418edf2b26bba38b0cbb.1742852846.git.jpoimboe@xxxxxxxxxx
---
tools/objtool/check.c | 11 +++++++++--
1 file changed, 9 insertions(+), 2 deletions(-)
diff --git a/tools/objtool/check.c b/tools/objtool/check.c
index cb66e6b..b0ef14a 100644
--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -3187,7 +3187,7 @@ static int handle_insn_ops(struct instruction *insn,
if (update_cfi_state(insn, next_insn, &state->cfi, op))
return 1;
- if (!insn->alt_group)
+ if (!opts.uaccess || !insn->alt_group)
continue;
if (op->dest.type == OP_DEST_PUSHF) {
@@ -3647,6 +3647,9 @@ static int validate_branch(struct objtool_file *file, struct symbol *func,
return 0;
case INSN_STAC:
+ if (!opts.uaccess)
+ break;
+
if (state.uaccess) {
WARN_INSN(insn, "recursive UACCESS enable");
return 1;
@@ -3656,6 +3659,9 @@ static int validate_branch(struct objtool_file *file, struct symbol *func,
break;
case INSN_CLAC:
+ if (!opts.uaccess)
+ break;
+
if (!state.uaccess && func) {
WARN_INSN(insn, "redundant UACCESS disable");
return 1;
@@ -4114,7 +4120,8 @@ static int validate_symbol(struct objtool_file *file, struct section *sec,
if (!insn || insn->visited)
return 0;
- state->uaccess = sym->uaccess_safe;
+ if (opts.uaccess)
+ state->uaccess = sym->uaccess_safe;
ret = validate_branch(file, insn_func(insn), insn, *state);
if (ret)