linux-kernel - [PATCH v2 0/2] Allow to kexec with initramfs larger than 2G

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Date:   Fri, 27 May 2022 02:55:33 +0000
From:   Pasha Tatashin <pasha.tatashin@...een.com>
To:     pasha.tatashin@...een.com, sashal@...nel.org,
        ebiederm@...ssion.com, rburanyi@...gle.com, gthelen@...gle.com,
        viro@...iv.linux.org.uk, kexec@...ts.infradead.org,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2 0/2] Allow to kexec with initramfs larger than 2G

Currently, the largest initramfs that is supported by kexec_file_load()
syscall is 2G.

This is because kernel_read_file() returns int, and is limited to
INT_MAX or 2G.

On the other hand, there are kexec based boot loaders (i.e. u-root),
that may need to boot netboot images that might be larger than 2G.

The first patch changes the return type from int to ssize_t in
kernel_read_file* functions.

The second patch increases the maximum initramfs file size to 4G.

Tested: verified that can kexec_file_load() works with 4G initramfs
on x86_64.

Pasha Tatashin (2):
  fs/kernel_read_file: Allow to read files up-to ssize_t
  kexec_file: Increase maximum file size to 4G

 fs/kernel_read_file.c            | 38 ++++++++++++++++----------------
 include/linux/kernel_read_file.h | 32 +++++++++++++--------------
 include/linux/limits.h           |  1 +
 kernel/kexec_file.c              | 10 ++++++---
 4 files changed, 43 insertions(+), 38 deletions(-)

-- 
2.36.1.124.g0e6072fb45-goog