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| author | Arnd Bergmann <arnd@arndb.de> | 2019-11-05 11:39:51 +0300 |
|---|---|---|
| committer | Arnd Bergmann <arnd@arndb.de> | 2019-12-18 20:07:31 +0300 |
| commit | 853bc0ab341b0c99619f83f4060dedcccad77b2a (patch) | |
| tree | ce5ecd2529f48e2b4544b88bf06bc09debd0c4db /arch/um/drivers/cow.h | |
| parent | 37e86e0fd0403f51d6dd49abd1469361714f6ca4 (diff) | |
| download | linux-853bc0ab341b0c99619f83f4060dedcccad77b2a.tar.xz | |
um: ubd: use 64-bit time_t where possible
The ubd code suffers from a possible y2038 overflow on 32-bit
architectures, both for the cow header and the os_file_modtime()
function.
Replace time_t with time64_t to extend the ubd_kern side as much
as possible.
Whether this makes a difference for the user side depends on
the host libc implementation that may use either 32-bit or 64-bit
time_t.
For the cow file format, the header contains an unsigned 32-bit
timestamp, which is good until y2106, passing this through a
'long long' gives us a consistent interpretation between 32-bit
and 64-bit um kernels.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Diffstat (limited to 'arch/um/drivers/cow.h')
| -rw-r--r-- | arch/um/drivers/cow.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/um/drivers/cow.h b/arch/um/drivers/cow.h index 760c507dd5b6..103adac691ed 100644 --- a/arch/um/drivers/cow.h +++ b/arch/um/drivers/cow.h @@ -11,7 +11,7 @@ extern int init_cow_file(int fd, char *cow_file, char *backing_file, extern int file_reader(__u64 offset, char *buf, int len, void *arg); extern int read_cow_header(int (*reader)(__u64, char *, int, void *), void *arg, __u32 *version_out, - char **backing_file_out, time_t *mtime_out, + char **backing_file_out, long long *mtime_out, unsigned long long *size_out, int *sectorsize_out, __u32 *align_out, int *bitmap_offset_out); |