diff options
| author | Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2022-01-06 00:55:12 +0300 |
|---|---|---|
| committer | Luis Chamberlain <mcgrof@kernel.org> | 2022-01-12 05:45:02 +0300 |
| commit | b1ae6dc41eaaa98bb75671e0f3665bfda248c3e7 (patch) | |
| tree | ca0724001b3059a3dd526d2137e53fb910cd1af7 /include/uapi | |
| parent | ef307fc2a9bd776114f9c85bc676ad76fe8f0f2a (diff) | |
| download | linux-b1ae6dc41eaaa98bb75671e0f3665bfda248c3e7.tar.xz | |
module: add in-kernel support for decompressing
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>
Diffstat (limited to 'include/uapi')
| -rw-r--r-- | include/uapi/linux/module.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/uapi/linux/module.h b/include/uapi/linux/module.h index 50d98ec5e866..03a33ffffcba 100644 --- a/include/uapi/linux/module.h +++ b/include/uapi/linux/module.h @@ -5,5 +5,6 @@ /* Flags for sys_finit_module: */ #define MODULE_INIT_IGNORE_MODVERSIONS 1 #define MODULE_INIT_IGNORE_VERMAGIC 2 +#define MODULE_INIT_COMPRESSED_FILE 4 #endif /* _UAPI_LINUX_MODULE_H */ |