From cab496e16cb384de03010d9dea7399cbbfb3c3f9 Mon Sep 17 00:00:00 2001 From: Andrew Turner Date: Tue, 15 Mar 2022 17:42:30 +0000 Subject: [PATCH] Make SHMMAXPGS an unsigned long This is used to calculate sizes that are then stored in unsigned long fields. Make this unsigned long so the calculations use this type and not an int that can lead to an integer overflow with a large PAGE_SIZE. This allows building this on arm64 with PAGE_SIZE of 16k. Further work will be needed if a 32-bit architecture tries to use a similar sized page. Sponsored by: The FreeBSD Foundation --- sys/kern/sysv_shm.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/sys/kern/sysv_shm.c b/sys/kern/sysv_shm.c index 7ba6c1187bc..658b48e2e2e 100644 --- a/sys/kern/sysv_shm.c +++ b/sys/kern/sysv_shm.c @@ -155,7 +155,7 @@ static void shm_prison_cleanup(struct prison *); * Tuneable values. */ #ifndef SHMMAXPGS -#define SHMMAXPGS 131072 /* Note: sysv shared memory is swap backed. */ +#define SHMMAXPGS 131072ul /* Note: sysv shared memory is swap backed. */ #endif #ifndef SHMMAX #define SHMMAX (SHMMAXPGS*PAGE_SIZE)