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c3525940cc
Currently on powerpc we have our own #define for the highest (negative) errno value, called _LAST_ERRNO. This is defined to be 516, for reasons which are not clear. The generic code, and x86, use MAX_ERRNO, which is defined to be 4095. In particular seccomp uses MAX_ERRNO to restrict the value that a seccomp filter can return. Currently with the mismatch between _LAST_ERRNO and MAX_ERRNO, a seccomp tracer wanting to return 600, expecting it to be seen as an error, would instead find on powerpc that userspace sees a successful syscall with a return value of 600. To avoid this inconsistency, switch powerpc to use MAX_ERRNO. We are somewhat confident that generic syscalls that can return a non-error value above negative MAX_ERRNO have already been updated to use force_successful_syscall_return(). I have also checked all the powerpc specific syscalls, and believe that none of them expect to return a non-error value between -MAX_ERRNO and -516. So this change should be safe ... Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Reviewed-by: Kees Cook <keescook@chromium.org> |
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| .. | ||
| auxvec.h | ||
| bitsperlong.h | ||
| bootx.h | ||
| byteorder.h | ||
| cputable.h | ||
| eeh.h | ||
| elf.h | ||
| epapr_hcalls.h | ||
| errno.h | ||
| fcntl.h | ||
| ioctl.h | ||
| ioctls.h | ||
| ipcbuf.h | ||
| Kbuild | ||
| kvm_para.h | ||
| kvm.h | ||
| mman.h | ||
| msgbuf.h | ||
| nvram.h | ||
| opal-prd.h | ||
| param.h | ||
| perf_event.h | ||
| poll.h | ||
| posix_types.h | ||
| ps3fb.h | ||
| ptrace.h | ||
| resource.h | ||
| sembuf.h | ||
| setup.h | ||
| shmbuf.h | ||
| sigcontext.h | ||
| siginfo.h | ||
| signal.h | ||
| socket.h | ||
| sockios.h | ||
| spu_info.h | ||
| stat.h | ||
| statfs.h | ||
| swab.h | ||
| termbits.h | ||
| termios.h | ||
| tm.h | ||
| types.h | ||
| ucontext.h | ||
| unistd.h | ||