openbsd-src/lib/libc/arch/amd64/sys/ at jcs · jcs.org/openbsd-src

jcs.org / openbsd-src

jcs's openbsd hax

openbsd

openbsd-src / lib / libc / arch / amd64 / sys /

at jcs 8 files

Make two corrections to the vfork(2) stub: * with IBT, it can't return via an indirect jump as that would require the *caller* to have an endbr64 * to support a potential vmspace-sharing implementation, keep the retguard value in an arg register across the underlying syscall

2 years ago

Add retguard to amd64 syscalls.

3 years ago

Add retguard to amd64 syscalls.

3 years ago

Add retguard to amd64 syscalls.

3 years ago

Add retguard to amd64 syscalls.

3 years ago

Add retguard to amd64 syscalls.

3 years ago

Retguard addition in commit 72pYktDvmJhq7OyF was based on the understanding that the removal of the off_t padding, amd64 syscalls no longer passed a 7th or later argument. We overlooked that syscall(2) bumps the arg count by one, so six argument calls like SYS_sysctl still pass an argument on the stack.

2 years ago

Populate the non-LOAD openbsd.syscalls section (and PT_OPENBSD_SYSCALL) with {uint offset, uint syscall#} entries in libc & ld.so. In libc a few syscall# entries (break, sigprocmask, _tfork, _threxit) are duplicated because additional or inline uses occur (that situation is handled elsewhere) ok kettenis

2 years ago