We need to manually unpoison rounded up allocation size for dname to avoid kasan's reports in __d_lookup_rcu. __d_lookup_rcu may validly read a little beyound allocated size.
Reported-by: Dmitry Vyukov <[email protected]> Signed-off-by: Andrey Ryabinin <[email protected]> --- fs/dcache.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/fs/dcache.c b/fs/dcache.c index b7e8b20..dff64f2 100644 --- a/fs/dcache.c +++ b/fs/dcache.c @@ -38,6 +38,7 @@ #include <linux/prefetch.h> #include <linux/ratelimit.h> #include <linux/list_lru.h> +#include <linux/kasan.h> #include "internal.h" #include "mount.h" @@ -1412,6 +1413,8 @@ struct dentry *__d_alloc(struct super_block *sb, const struct qstr *name) kmem_cache_free(dentry_cache, dentry); return NULL; } + unpoison_shadow(dname, + roundup(name->len + 1, sizeof(unsigned long))); } else { dname = dentry->d_iname; } -- 1.8.5.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
