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| author | Pasha Tatashin <pasha.tatashin@soleen.com> | 2022-05-27 04:55:35 +0200 |
|---|---|---|
| committer | akpm <akpm@linux-foundation.org> | 2022-06-17 04:58:21 +0200 |
| commit | f4da7afe07523ff8930c4466b09a15db18508cd4 (patch) | |
| tree | 43935c8bf06b673b322197fb93d646db481cc996 /kernel/kexec_file.c | |
| parent | fs/kernel_read_file: allow to read files up-to ssize_t (diff) | |
| download | linux-f4da7afe07523ff8930c4466b09a15db18508cd4.tar.xz linux-f4da7afe07523ff8930c4466b09a15db18508cd4.zip | |
kexec_file: increase maximum file size to 4G
In some case initrd can be large. For example, it could be a netboot
image loaded by u-root, that is kexec'ing into it.
The maximum size of initrd is arbitrary set to 2G. Also, the limit is not
very obvious because it is hidden behind a generic INT_MAX macro.
Theoretically, we could make it LONG_MAX, but it is safer to keep it sane,
and just increase it to 4G.
Increase the size to 4G, and make it obvious by having a new macro that
specifies the maximum file size supported by kexec_file_load() syscall:
KEXEC_FILE_SIZE_MAX.
Link: https://lkml.kernel.org/r/20220527025535.3953665-3-pasha.tatashin@soleen.com
Signed-off-by: Pasha Tatashin <pasha.tatashin@soleen.com>
Cc: Sasha Levin <sashal@kernel.org>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Greg Thelen <gthelen@google.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Baoquan He <bhe@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'kernel/kexec_file.c')
| -rw-r--r-- | kernel/kexec_file.c | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/kernel/kexec_file.c b/kernel/kexec_file.c index 145321a5e798..9b2839775c83 100644 --- a/kernel/kexec_file.c +++ b/kernel/kexec_file.c @@ -31,6 +31,9 @@ static int kexec_calculate_store_digests(struct kimage *image); +/* Maximum size in bytes for kernel/initrd files. */ +#define KEXEC_FILE_SIZE_MAX min_t(s64, 4LL << 30, SSIZE_MAX) + /* * Currently this is the only default function that is exported as some * architectures need it to do additional handlings. @@ -189,11 +192,12 @@ kimage_file_prepare_segments(struct kimage *image, int kernel_fd, int initrd_fd, const char __user *cmdline_ptr, unsigned long cmdline_len, unsigned flags) { - int ret; + ssize_t ret; void *ldata; ret = kernel_read_file_from_fd(kernel_fd, 0, &image->kernel_buf, - INT_MAX, NULL, READING_KEXEC_IMAGE); + KEXEC_FILE_SIZE_MAX, NULL, + READING_KEXEC_IMAGE); if (ret < 0) return ret; image->kernel_buf_len = ret; @@ -213,7 +217,7 @@ kimage_file_prepare_segments(struct kimage *image, int kernel_fd, int initrd_fd, /* It is possible that there no initramfs is being loaded */ if (!(flags & KEXEC_FILE_NO_INITRAMFS)) { ret = kernel_read_file_from_fd(initrd_fd, 0, &image->initrd_buf, - INT_MAX, NULL, + KEXEC_FILE_SIZE_MAX, NULL, READING_KEXEC_INITRAMFS); if (ret < 0) goto out; |