kernel.git/arch/s390/include/asm/fpu/api.h, branch linux-4.6.yHosts the 0x221E linux distro kernel.
https://git.0xinfinity.dev/distro/kernel.git/atom?h=linux-4.6.y2016-07-27T15:42:24Zs390: fix test_fp_ctl inline assembly contraints2016-07-27T15:42:24ZMartin Schwidefsky2016-06-27T15:06:45Zurn:sha1:08d3eff690dcbdc4f27a212eb2b9578b8b579b11
commit bcf4dd5f9ee096bd1510f838dd4750c35df4e38b upstream.
The test_fp_ctl function is used to test if a given value is a valid
floating-point control. The inline assembly in test_fp_ctl uses an
incorrect constraint for the 'orig_fpc' variable. If the compiler
chooses the same register for 'fpc' and 'orig_fpc' the test_fp_ctl()
function always returns true. This allows user space to trigger
kernel oopses with invalid floating-point control values on the
signal stack.
This problem has been introduced with git commit 4725c86055f5bbdcdf
"s390: fix save and restore of the floating-point-control register"
Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
s390/fpu: split fpu-internal.h into fpu internals, api, and type headers2015-10-16T07:41:12ZHendrik Brueckner2015-10-06T10:25:59Zurn:sha1:b0753902d42f5cb01c33f0dec47ba2aa7ecfbb3f
Split the API and FPU type definitions into separate header files
similar to "x86/fpu: Rename fpu-internal.h to fpu/internal.h" (78f7f1e54b).
The new header files and their meaning are:
asm/fpu/types.h:
FPU related data types, needed for 'struct thread_struct' and
'struct task_struct'.
asm/fpu/api.h:
FPU related 'public' functions for other subsystems and device
drivers.
asm/fpu/internal.h:
FPU internal functions mainly used to convert
FPU register contents in signal handling.
Signed-off-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>