# Creates independent Landlock hierarchies and try different tracer/tracee
# schemas (without scheduling control).
#
# In this test, some ptrace(2) calls return different code according to the
# calling thread.

capset(&AUTO={0x20080522, 0x0}, &AUTO={0x0, 0x0, 0x0, 0x0, 0x0, 0x0})
prctl$PR_SET_NO_NEW_PRIVS(0x26, 0x1)

r0 = syz_clone(0x11, 0x0, 0x0, 0x0, 0x0, 0x0)

# PTRACE_ATTACH and PTRACE_DETACH

ptrace(0x10, r0)
ptrace(0x11, r0)

r1 = landlock_create_ruleset(&AUTO={0x100, 0x0, 0x0}, AUTO, 0x0)
landlock_restrict_self(r1, 0x0)

r2 = syz_clone(0x11, 0x0, 0x0, 0x0, 0x0, 0x0)

ptrace(0x10, r0) # EPERM
ptrace(0x11, r0)

ptrace(0x10, r2)
ptrace(0x11, r2)

r3 = landlock_create_ruleset(&AUTO={0x100, 0x0, 0x0}, AUTO, 0x0)
landlock_restrict_self(r3, 0x0)

ptrace(0x10, r0) # EPERM
ptrace(0x11, r0)

ptrace(0x10, r2) # EPERM
ptrace(0x11, r2)

# For now, PTRACE_TRACEME is transformed to -1, which returns an error:
# https://github.com/google/syzkaller/blob/cbd0445ec3b0b184db66966d8a47e6b37d13692e/sys/linux/init.go#L179-L182

ptrace(0x0, 0x0)