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objtool: Always fail on fatal errors

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Objtool writes several object annotations which are used to enable
critical kernel runtime functionalities like static calls and
retpoline/rethunk patching.

In the rare case where it fails to read or write an object, the
annotations don't get written, causing runtime code patching to fail and
code to become corrupted.

Due to the catastrophic nature of such warnings, convert them to errors
which fail the build regardless of CONFIG_OBJTOOL_WERROR.

Reported-by: Chaitanya Kumar Borah <chaitanya.kumar.borah@intel.com>
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/7d35684ca61eac56eb2424f300ca43c5d257b170.1743481539.git.jpoimboe@kernel.org
Closes: https://lore.kernel.org/SJ1PR11MB61295789E25C2F5197EFF2F6B9A72@SJ1PR11MB6129.namprd11.prod.outlook.com
This commit is contained in:
Josh Poimboeuf 2025-03-31 21:26:40 -07:00 • committed by Ingo Molnar
parent c5610071a6
commit 0b10177114
1 changed files with 4 additions and 11 deletions
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15
tools/objtool/check.c
View file

@ -4753,6 +4753,9 @@ out:
if (!ret && !warnings)
return 0;
if (opts.werror && warnings)
ret = 1;
if (opts.verbose) {
if (opts.werror && warnings)
WARN("%d warning(s) upgraded to errors", warnings);
@ -4760,15 +4763,5 @@ out:
disas_warned_funcs(file);
}
/*
* CONFIG_OBJTOOL_WERROR upgrades all warnings (and errors) to actual
* errors.
*
* Note that even fatal errors don't yet actually return an error
* without CONFIG_OBJTOOL_WERROR. That will be fixed soon-ish.
*/
if (opts.werror)
return 1;
return 0;
return ret;
}