Commit b8f3830c authored Aug 01, 2022 by Helge Deller Committed by Greg Kroah-Hartman Aug 25, 2022

parisc: io_pgetevents_time64() needs compat syscall in 32-bit compat mode



commit 6431e92fc827bdd2d28f79150d90415ba9ce0d21 upstream.

For all syscalls in 32-bit compat mode on 64-bit kernels the upper
32-bits of the 64-bit registers are zeroed out, so a negative 32-bit
signed value will show up as positive 64-bit signed value.

This behaviour breaks the io_pgetevents_time64() syscall which expects
signed 64-bit values for the "min_nr" and "nr" parameters.
Fix this by switching to the compat_sys_io_pgetevents_time64() syscall,
which uses "compat_long_t" types for those parameters.

Cc: <stable@vger.kernel.org> # v5.1+
Signed-off-by: Helge Deller <deller@gmx.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

parent d7ba24d3

arch/parisc/kernel/syscalls/syscall.tbl

+1 −1

Original line number	Diff line number	Diff line
		@@ -413,7 +413,7 @@
		412 32 utimensat_time64 sys_utimensat sys_utimensat
		413 32 pselect6_time64 sys_pselect6 compat_sys_pselect6_time64
		414 32 ppoll_time64 sys_ppoll compat_sys_ppoll_time64
		416 32 io_pgetevents_time64 sys_io_pgetevents sys_io_pgetevents
		416 32 io_pgetevents_time64 sys_io_pgetevents compat_sys_io_pgetevents_time64
		417 32 recvmmsg_time64 sys_recvmmsg compat_sys_recvmmsg_time64
		418 32 mq_timedsend_time64 sys_mq_timedsend sys_mq_timedsend
		419 32 mq_timedreceive_time64 sys_mq_timedreceive sys_mq_timedreceive