Commit 193b7279 authored by Thorsten Blum's avatar Thorsten Blum Committed by Christian Brauner
Browse files

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: default avatarThorsten Blum <thorsten.blum@toblux.com>
Link: https://lore.kernel.org/r/20240808150023.72578-2-thorsten.blum@toblux.com


Reviewed-by: default avatarGustavo A. R. Silva <gustavoars@kernel.org>
Signed-off-by: default avatarChristian Brauner <brauner@kernel.org>
parent 0f93bb54

fs/select.c

+1 −1
Original line number Diff line number Diff line
@@ -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))