From 193b72792fdba54aa2af6c3ad72ce16c3f06b4f7 Mon Sep 17 00:00:00 2001 From: Thorsten Blum Date: Thu, 8 Aug 2024 17:00:24 +0200 Subject: [PATCH] fs/select: Annotate struct poll_list with __counted_by() Add the __counted_by compiler attribute to the flexible array member entries to improve access bounds-checking via CONFIG_UBSAN_BOUNDS and CONFIG_FORTIFY_SOURCE. Signed-off-by: Thorsten Blum Link: https://lore.kernel.org/r/20240808150023.72578-2-thorsten.blum@toblux.com Reviewed-by: Gustavo A. R. Silva Signed-off-by: Christian Brauner --- fs/select.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/fs/select.c b/fs/select.c index 9515c3fa1a03..1a4849e2afb9 100644 --- a/fs/select.c +++ b/fs/select.c @@ -840,7 +840,7 @@ SYSCALL_DEFINE1(old_select, struct sel_arg_struct __user *, arg) struct poll_list { struct poll_list *next; unsigned int len; - struct pollfd entries[]; + struct pollfd entries[] __counted_by(len); }; #define POLLFD_PER_PAGE ((PAGE_SIZE-sizeof(struct poll_list)) / sizeof(struct pollfd))