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authorArnd Bergmann <arnd@arndb.de>2019-11-05 11:39:51 +0300
committerArnd Bergmann <arnd@arndb.de>2019-12-18 20:07:31 +0300
commit853bc0ab341b0c99619f83f4060dedcccad77b2a (patch)
treece5ecd2529f48e2b4544b88bf06bc09debd0c4db /arch/um/os-Linux
parent37e86e0fd0403f51d6dd49abd1469361714f6ca4 (diff)
downloadlinux-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/os-Linux')
-rw-r--r--arch/um/os-Linux/file.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/um/os-Linux/file.c b/arch/um/os-Linux/file.c
index 5133e3afb96f..fbda10535dab 100644
--- a/arch/um/os-Linux/file.c
+++ b/arch/um/os-Linux/file.c
@@ -341,7 +341,7 @@ int os_file_size(const char *file, unsigned long long *size_out)
return 0;
}
-int os_file_modtime(const char *file, unsigned long *modtime)
+int os_file_modtime(const char *file, long long *modtime)
{
struct uml_stat buf;
int err;