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b1ae6dc41e
Current scheme of having userspace decompress kernel modules before loading them into the kernel runs afoul of LoadPin security policy, as it loses link between the source of kernel module on the disk and binary blob that is being loaded into the kernel. To solve this issue let's implement decompression in kernel, so that we can pass a file descriptor of compressed module file into finit_module() which will keep LoadPin happy. To let userspace know what compression/decompression scheme kernel supports it will create /sys/module/compression attribute. kmod can read this attribute and decide if it can pass compressed file to finit_module(). New MODULE_INIT_COMPRESSED_DATA flag indicates that the kernel should attempt to decompress the data read from file descriptor prior to trying load the module. To simplify things kernel will only implement single decompression method matching compression method selected when generating modules. This patch implements gzip and xz; more can be added later, Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com> Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
10 lines
308 B
C
10 lines
308 B
C
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
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#ifndef _UAPI_LINUX_MODULE_H
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#define _UAPI_LINUX_MODULE_H
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/* Flags for sys_finit_module: */
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#define MODULE_INIT_IGNORE_MODVERSIONS 1
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#define MODULE_INIT_IGNORE_VERMAGIC 2
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#define MODULE_INIT_COMPRESSED_FILE 4
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#endif /* _UAPI_LINUX_MODULE_H */
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