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gcc-plugins: randstruct: Update code comment in relayout_struct()

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Update code comment to clarify that the only element whose layout is
not randomized is a proper C99 flexible-array member. This update is
complementary to commit 1ee60356c2 ("gcc-plugins: randstruct: Only
warn about true flexible arrays")

Signed-off-by: "Gustavo A. R. Silva" <gustavoars@kernel.org>
Link: https://lore.kernel.org/r/ZWJr2MWDjXLHE8ap@work
Fixes: 1ee60356c2 ("gcc-plugins: randstruct: Only warn about true flexible arrays")
Signed-off-by: Kees Cook <keescook@chromium.org>
This commit is contained in:
Gustavo A. R. Silva 2023-11-25 15:49:12 -06:00 committed by Kees Cook
parent 4e86f32a13
commit d71f22365a
1 changed files with 1 additions and 2 deletions
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scripts/gcc-plugins/randomize_layout_plugin.c
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@ -339,8 +339,7 @@ static int relayout_struct(tree type)
/*
* enforce that we don't randomize the layout of the last
* element of a struct if it's a 0 or 1-length array
* or a proper flexible array
* element of a struct if it's a proper flexible array
*/
if (is_flexible_array(newtree[num_fields - 1])) {
has_flexarray = true;