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checkpatch: check for 0-length and 1-element arrays 

Fake flexible arrays have been deprecated since last millennium.  Proper
C99 flexible arrays must be used throughout the kernel so
CONFIG_FORTIFY_SOURCE and CONFIG_UBSAN_BOUNDS can provide proper array
bounds checking.

[joe@perches.com: various suggestions]
Link: https://lkml.kernel.org/r/20230601160746.up.948-kees@kernel.org
Link: https://lore.kernel.org/r/20230517204530.never.151-kees@kernel.org
Signed-off-by: Kees Cook <keescook@chromium.org>
Acked-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Acked-by: Joe Perches <joe@perches.com>
Cc: Andy Whitcroft <apw@canonical.com>
Cc: Dwaipayan Ray <dwaipayanray1@gmail.com>
Cc: Lukas Bulwahn <lukas.bulwahn@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Kees Cook 2023-06-01 09:07:46 -07:00 committed by Andrew Morton
parent 16c6006af4
commit f26799ffd6
1 changed files with 10 additions and 0 deletions
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10
scripts/checkpatch.pl
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@ -7418,6 +7418,16 @@ sub process {
}
}
# check for array definition/declarations that should use flexible arrays instead
if ($sline =~ /^[\+ ]\s*\}(?:\s*__packed)?\s*;\s*$/ &&
$prevline =~ /^\+\s*(?:\}(?:\s*__packed\s*)?|$Type)\s*$Ident\s*\[\s*(0|1)\s*\]\s*;\s*$/) {
if (ERROR("FLEXIBLE_ARRAY",
"Use C99 flexible arrays - see https://docs.kernel.org/process/deprecated.html#zero-length-and-one-element-arrays\n" . $hereprev) &&
$1 == '0' && $fix) {
$fixed[$fixlinenr - 1] =~ s/\[\s*0\s*\]/[]/;
}
}
# nested likely/unlikely calls
if ($line =~ /\b(?:(?:un)?likely)\s*\(\s*!?\s*(IS_ERR(?:_OR_NULL|_VALUE)?|WARN)/) {
WARN("LIKELY_MISUSE",