6.1-stable review patch. If anyone has any objections, please let me know.
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From: Josh Poimboeuf jpoimboe@kernel.org
[ Upstream commit e1a9dda74dbffbc3fa2069ff418a1876dc99fb14 ]
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@kernel.org Signed-off-by: Ingo Molnar mingo@kernel.org Cc: Linus Torvalds torvalds@linux-foundation.org Link: https://lore.kernel.org/r/0e95581c1d2107fb5f59418edf2b26bba38b0cbb.174285284... Signed-off-by: Sasha Levin sashal@kernel.org --- 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 828c91aaf55bd..bf75628c5389a 100644 --- a/tools/objtool/check.c +++ b/tools/objtool/check.c @@ -3083,7 +3083,7 @@ 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) { @@ -3535,6 +3535,9 @@ static int validate_branch(struct objtool_file *file, struct symbol *func, return 0;
case INSN_STAC: + if (!opts.uaccess) + break; + if (state.uaccess) { WARN_FUNC("recursive UACCESS enable", sec, insn->offset); return 1; @@ -3544,6 +3547,9 @@ static int validate_branch(struct objtool_file *file, struct symbol *func, break;
case INSN_CLAC: + if (!opts.uaccess) + break; + if (!state.uaccess && func) { WARN_FUNC("redundant UACCESS disable", sec, insn->offset); return 1; @@ -3956,7 +3962,8 @@ static int validate_symbol(struct objtool_file *file, struct section *sec, if (!insn || insn->ignore || insn->visited) return 0;
- state->uaccess = sym->uaccess_safe; + if (opts.uaccess) + state->uaccess = sym->uaccess_safe;
ret = validate_branch(file, insn->func, insn, *state); if (ret && opts.backtrace)