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randstruct: Check member structs in is_pure_ops_struct() 

While no uses in the kernel triggered this case, it was possible to have
a false negative where a struct contains other structs which contain only
function pointers because of unreachable code in is_pure_ops_struct().

Signed-off-by: Joonwon Kang <kjw1627@gmail.com>
Link: https://lore.kernel.org/r/20190727155841.GA13586@host
Fixes: 313dd1b629 ("gcc-plugins: Add the randstruct plugin")
Cc: stable@vger.kernel.org
Signed-off-by: Kees Cook <keescook@chromium.org>
This commit is contained in:
Joonwon Kang 2019-07-28 00:58:41 +09:00 committed by Kees Cook
parent 609488bc97
commit 60f2c82ed2
1 changed files with 5 additions and 5 deletions
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10
scripts/gcc-plugins/randomize_layout_plugin.c
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@ -443,13 +443,13 @@ static int is_pure_ops_struct(const_tree node)
if (node == fieldtype)
continue;
if (!is_fptr(fieldtype))
return 0;
if (code != RECORD_TYPE && code != UNION_TYPE)
if (code == RECORD_TYPE || code == UNION_TYPE) {
if (!is_pure_ops_struct(fieldtype))
return 0;
continue;
}
if (!is_pure_ops_struct(fieldtype))
if (!is_fptr(fieldtype))
return 0;
}