syscall.sh / s390x / memfd_secret

memfd_secret

create an anonymous RAM-based file to access secret memory regions

sys_memfd_secret(unsigned int flags)

number	447 (0x1bf)
abi	common
entry point	`sys_memfd_secret`
since	Linux 6.4
man page	memfd_secret(2)
source	elixir.bootlin.com

Registers

register	value
`r1`	447, the syscall number
`r2`	unsigned int flags
`r2`	the return value

Then run svc 0 to enter the kernel.

Same syscall on other architectures

x64 447
x86 447
arm64 447
riscv64 447
x32 1073742271
loongarch64 447

Get this as JSON: https://api.syscall.sh/v2/syscalls/s390x/memfd_secret