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| author | Pasha Tatashin <pasha.tatashin@soleen.com> | 2022-05-27 02:55:34 +0000 |
|---|---|---|
| committer | akpm <akpm@linux-foundation.org> | 2022-06-16 19:58:21 -0700 |
| commit | dabba87229411a5e9d20ac03ffc36463c53ae672 (patch) | |
| tree | 18f5d1a121bb1723e153908378e1feeb4a6253d3 /include/linux/limits.h | |
| parent | d30dfd490f7dc4cb6a7c11a647bd1ff7a22139e7 (diff) | |
| download | linux-dabba87229411a5e9d20ac03ffc36463c53ae672.tar.gz | |
fs/kernel_read_file: allow to read files up-to ssize_t
Patch series "Allow to kexec with initramfs larger than 2G", v2.
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.
This patch (of 2):
Currently, the maximum file size that is supported is 2G. This may be too
small in some cases. For example, kexec_file_load() system call loads
initramfs. In some netboot cases initramfs can be rather large.
Allow to use up-to ssize_t bytes. The callers still can limit the maximum
file size via buf_size.
Link: https://lkml.kernel.org/r/20220527025535.3953665-1-pasha.tatashin@soleen.com
Link: https://lkml.kernel.org/r/20220527025535.3953665-2-pasha.tatashin@soleen.com
Signed-off-by: Pasha Tatashin <pasha.tatashin@soleen.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Baoquan He <bhe@redhat.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Greg Thelen <gthelen@google.com>
Cc: Sasha Levin <sashal@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'include/linux/limits.h')
| -rw-r--r-- | include/linux/limits.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/limits.h b/include/linux/limits.h index b568b9c30bbf58..f6bcc936901071 100644 --- a/include/linux/limits.h +++ b/include/linux/limits.h @@ -7,6 +7,7 @@ #include <vdso/limits.h> #define SIZE_MAX (~(size_t)0) +#define SSIZE_MAX ((ssize_t)(SIZE_MAX >> 1)) #define PHYS_ADDR_MAX (~(phys_addr_t)0) #define U8_MAX ((u8)~0U) |