path: root/arch/arm64/boot
diff options
authorBoris Ostrovsky <>2014-05-09 11:11:27 -0400
committerH. Peter Anvin <>2014-05-09 08:45:52 -0700
commit28b92e09e25bdc0ae864b22eacf195a74f861389 (patch)
tree2483505e3c98fd83565a1576af11daf629f8efdf /arch/arm64/boot
parentc45f77364ba060395b7eff1bf45e6c537f913380 (diff)
x86, vdso, time: Cast tv_nsec to u64 for proper shifting in update_vsyscall()
With tk->wall_to_monotonic.tv_nsec being a 32-bit value on 32-bit systems, (tk->wall_to_monotonic.tv_nsec << tk->shift) in update_vsyscall() may lose upper bits or, worse, add them since compiler will do this: (u64)(tk->wall_to_monotonic.tv_nsec << tk->shift) instead of ((u64)tk->wall_to_monotonic.tv_nsec << tk->shift) So if, for example, tv_nsec is 0x800000 and shift is 8 we will end up with 0xffffffff80000000 instead of 0x80000000. And then we are stuck in the subsequent 'while' loop. We need an explicit cast. Signed-off-by: Boris Ostrovsky <> Link: Acked-by: Konrad Rzeszutek Wilk <> Cc: <> # v3.14 Signed-off-by: H. Peter Anvin <>
Diffstat (limited to 'arch/arm64/boot')
0 files changed, 0 insertions, 0 deletions