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51 lines
1.8 KiB
Rust
51 lines
1.8 KiB
Rust
// SPDX-License-Identifier: MPL-2.0
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use super::SyscallReturn;
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use crate::{
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prelude::*,
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process::credentials::{
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c_types::{cap_user_data_t, cap_user_header_t, LINUX_CAPABILITY_VERSION_3},
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capabilities::CapSet,
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},
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};
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fn make_kernel_cap(low: u32, high: u32) -> u64 {
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((low as u64) | ((high as u64) << 32)) & ((1u64 << (CapSet::most_significant_bit() + 1)) - 1)
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}
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pub fn sys_capset(
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cap_user_header_addr: Vaddr,
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cap_user_data_addr: Vaddr,
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ctx: &Context,
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) -> Result<SyscallReturn> {
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let user_space = ctx.user_space();
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let cap_user_header: cap_user_header_t =
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user_space.read_val::<cap_user_header_t>(cap_user_header_addr)?;
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if cap_user_header.version != LINUX_CAPABILITY_VERSION_3 {
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return_errno_with_message!(Errno::EINVAL, "not supported (capability version is not 3)");
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};
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// The ability to set capabilities of any other process has been deprecated.
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// See: https://elixir.bootlin.com/linux/v6.9.3/source/kernel/capability.c#L209 for more details.
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let header_pid = cap_user_header.pid;
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if header_pid != 0 && header_pid != ctx.process.pid() {
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return_errno_with_message!(Errno::EINVAL, "invalid pid");
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}
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// Convert the cap(u32) to u64
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let cap_user_data: cap_user_data_t =
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user_space.read_val::<cap_user_data_t>(cap_user_data_addr)?;
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let inheritable = make_kernel_cap(cap_user_data.inheritable, 0);
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let permitted = make_kernel_cap(cap_user_data.permitted, 0);
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let effective = make_kernel_cap(cap_user_data.effective, 0);
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let credentials = ctx.posix_thread.credentials_mut();
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credentials.set_inheritable_capset(CapSet::from_bits_truncate(inheritable));
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credentials.set_permitted_capset(CapSet::from_bits_truncate(permitted));
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credentials.set_effective_capset(CapSet::from_bits_truncate(effective));
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Ok(SyscallReturn::Return(0))
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}
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