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There are a lot of embedded systems that run most or all of their functionality in init, running as root:root. For these systems, supporting multiple users is not necessary. This patch adds a new symbol, CONFIG_MULTIUSER, that makes support for non-root users, non-root groups, and capabilities optional. It is enabled under CONFIG_EXPERT menu. When this symbol is not defined, UID and GID are zero in any possible case and processes always have all capabilities. The following syscalls are compiled out: setuid, setregid, setgid, setreuid, setresuid, getresuid, setresgid, getresgid, setgroups, getgroups, setfsuid, setfsgid, capget, capset. Also, groups.c is compiled out completely. In kernel/capability.c, capable function was moved in order to avoid adding two ifdef blocks. This change saves about 25 KB on a defconfig build. The most minimal kernels have total text sizes in the high hundreds of kB rather than low MB. (The 25k goes down a bit with allnoconfig, but not that much. The kernel was booted in Qemu. All the common functionalities work. Adding users/groups is not possible, failing with -ENOSYS. Bloat-o-meter output: add/remove: 7/87 grow/shrink: 19/397 up/down: 1675/-26325 (-24650) [akpm@linux-foundation.org: coding-style fixes] Signed-off-by: Iulia Manda <iulia.manda21@gmail.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org> Acked-by: Geert Uytterhoeven <geert@linux-m68k.org> Tested-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
76 lines
2.0 KiB
Plaintext
76 lines
2.0 KiB
Plaintext
config SUNRPC
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tristate
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depends on MULTIUSER
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config SUNRPC_GSS
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tristate
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select OID_REGISTRY
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depends on MULTIUSER
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config SUNRPC_BACKCHANNEL
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bool
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depends on SUNRPC
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config SUNRPC_SWAP
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bool
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depends on SUNRPC
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config RPCSEC_GSS_KRB5
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tristate "Secure RPC: Kerberos V mechanism"
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depends on SUNRPC && CRYPTO
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depends on CRYPTO_MD5 && CRYPTO_DES && CRYPTO_CBC && CRYPTO_CTS
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depends on CRYPTO_ECB && CRYPTO_HMAC && CRYPTO_SHA1 && CRYPTO_AES
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depends on CRYPTO_ARC4
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default y
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select SUNRPC_GSS
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help
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Choose Y here to enable Secure RPC using the Kerberos version 5
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GSS-API mechanism (RFC 1964).
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Secure RPC calls with Kerberos require an auxiliary user-space
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daemon which may be found in the Linux nfs-utils package
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available from http://linux-nfs.org/. In addition, user-space
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Kerberos support should be installed.
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If unsure, say Y.
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config SUNRPC_DEBUG
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bool "RPC: Enable dprintk debugging"
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depends on SUNRPC && SYSCTL
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select DEBUG_FS
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help
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This option enables a sysctl-based debugging interface
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that is be used by the 'rpcdebug' utility to turn on or off
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logging of different aspects of the kernel RPC activity.
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Disabling this option will make your kernel slightly smaller,
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but makes troubleshooting NFS issues significantly harder.
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If unsure, say Y.
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config SUNRPC_XPRT_RDMA_CLIENT
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tristate "RPC over RDMA Client Support"
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depends on SUNRPC && INFINIBAND && INFINIBAND_ADDR_TRANS
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default SUNRPC && INFINIBAND
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help
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This option allows the NFS client to support an RDMA-enabled
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transport.
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To compile RPC client RDMA transport support as a module,
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choose M here: the module will be called xprtrdma.
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If unsure, say N.
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config SUNRPC_XPRT_RDMA_SERVER
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tristate "RPC over RDMA Server Support"
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depends on SUNRPC && INFINIBAND && INFINIBAND_ADDR_TRANS
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default SUNRPC && INFINIBAND
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help
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This option allows the NFS server to support an RDMA-enabled
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transport.
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To compile RPC server RDMA transport support as a module,
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choose M here: the module will be called svcrdma.
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If unsure, say N.
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