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Subject[PATCH 01/17] uml: make 64-bit COW files compatible with 32-bit ones.
From: Paolo 'Blaisorblade' Giarrusso <>

This is the minimal fix to make 64-bit UML binaries create 32-bit
compatible COW files and read them.
I've indeed tested that current code doesn't do this - the code gets SIGFPE for
a division by a value read at the wrong place, where 0 is found.

Signed-off-by: Paolo 'Blaisorblade' Giarrusso <>

arch/um/drivers/cow_user.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/arch/um/drivers/cow_user.c b/arch/um/drivers/cow_user.c
index 61951b7..afdf1ea 100644
--- a/arch/um/drivers/cow_user.c
+++ b/arch/um/drivers/cow_user.c
@@ -75,7 +75,7 @@ struct cow_header_v3 {
__u32 alignment;
__u32 cow_format;
char backing_file[PATH_LEN_V3];
+} __attribute__((packed));

/* COW format definitions - for now, we have only the usual COW bitmap */
#define COW_BITMAP 0
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