Segher Boessenkool <seg...@kernel.crashing.org> writes: > On Mon, Jan 23, 2017 at 07:10:00PM -0500, Jan Stancek wrote: >> I'm running into panics with stack protector enabled on ppc64le > >> I came across following gcc commit: >> >> https://gcc.gnu.org/git/?p=gcc.git;a=commit;h=0d55f4d0aeaeb16629a2c07c96a190695b83a7e6 >> which mentions offset above: >> "If TARGET_THREAD_SSP_OFFSET is defined, use -0x7010(13) resp. >> -0x7008(2) instead of reading __stack_chk_guard variable." >> >> It looks like it's not reading canary value from __stack_chk_guard variable. >> atm. I'm not sure where -28688(r13) falls in ppc kernel (somewhere near paca >> struct?). >> >> Is anyone else seeing these panics? > > Everyone is.
Are they? I'm not? > This is fixed in GCC 8 (and will be backported to GCC 7 and GCC 6 and > maybe even GCC 5). See <http://gcc.gnu.org/r244556> (and r244562 and > r244677). # cat /proc/version Linux version 4.10.0-rc5-compiler_gcc-6.3.0-00006-ge357eb97a6be (mich...@ka3.ozlabs.ibm.com) (gcc version 6.3.0 (Custom 4b5e15daff8b5444) ) #558 SMP Tue Jan 24 14:29:04 AEDT 2017 # zgrep STACKPROTECTOR /proc/config.gz CONFIG_HAVE_CC_STACKPROTECTOR=y CONFIG_CC_STACKPROTECTOR=y CONFIG_CC_STACKPROTECTOR_REGULAR=y I guess I'm just lucky? cheers