The 04/17/2020 11:05, Kyrylo Tkachov wrote: > Hi Szabolcs, > > > -----Original Message----- > > From: Szabolcs Nagy <szabolcs.n...@arm.com> > > Sent: 09 April 2020 15:20 > > To: gcc-patches@gcc.gnu.org > > Cc: Richard Earnshaw <richard.earns...@arm.com>; Richard Sandiford > > <richard.sandif...@arm.com>; Kyrylo Tkachov <kyrylo.tkac...@arm.com> > > Subject: [PATCH] aarch64, libgcc: Fix unwinding from pac-ret to normal > > frames [PR94514] > > > > With -mbranch-protection=pac-ret the debug info toggles the > > signedness state of the return address so the unwinder knows when > > the return address needs pointer authentication. > > > > The unwind context flags were not updated according to the dwarf > > frame info. > > > > This causes unwinding across frames that were built without pac-ret > > to incorrectly authenticate the return address wich corrupts the > > return address on a system where PAuth is enabled. > > > > Note: This even affects systems where all code use pac-ret because > > unwinding across a signal frame the return address is not signed. > > > > Ok, I'm guessing this needs backporting?
committed now, yes i think it has to go back to gcc-9 and gcc-8, i will do that later. thanks.
