File 65263472-libfsimage-xfs-amend-mask32lo.patch of Package xen.31421

# Commit ddc45e4eea946bb373a4b4a60c84bf9339cf413b
# Date 2023-10-11 06:36:49 +0100
# Author Alejandro Vallejo <alejandro.vallejo@cloud.com>
# Committer Andrew Cooper <andrew.cooper3@citrix.com>
libfsimage/xfs: Amend mask32lo() to allow the value 32

agblklog could plausibly be 32, but that would overflow this shift.
Perform the shift as ULL and cast to u32 at the end instead.

This is part of XSA-443 / CVE-2023-34325

Signed-off-by: Alejandro Vallejo <alejandro.vallejo@cloud.com>
Acked-by: Jan Beulich <jbeulich@suse.com>

--- a/tools/libfsimage/xfs/fsys_xfs.c
+++ b/tools/libfsimage/xfs/fsys_xfs.c
@@ -60,7 +60,7 @@ static struct xfs_info xfs;
 #define inode		((xfs_dinode_t *)((char *)FSYS_BUF + 8192))
 #define icore		(inode->di_core)
 
-#define	mask32lo(n)	(((xfs_uint32_t)1 << (n)) - 1)
+#define	mask32lo(n)	((xfs_uint32_t)((1ull << (n)) - 1))
 
 #define	XFS_INO_MASK(k)		((xfs_uint32_t)((1ULL << (k)) - 1))
 #define	XFS_INO_OFFSET_BITS	xfs.inopblog