On Thu, Jun 18, 2015 at 10:50:32PM -0400, Rich Felker wrote: > This is kernel ABI breakage that should be fixed -- people running old > kernel versions with old musl binaries might suffer a regression when > upgrading, and perhaps more importantly the failure mode is just > really bad. But I think we can also work around it on the userspace > side in musl by pointing the stack pointer at some rodata (or even at > pc, e.g. copying $25 to $sp) before making the syscall. Just to be on the safe side, make sure it is something that's readable. Core might me mapped execute-only, that is not readable and that is a feature which the affected kernels do support on suitable hardware. Ralf
