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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>
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@ -31,6 +31,9 @@
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static int kexec_calculate_store_digests(struct kimage *image);
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/* Maximum size in bytes for kernel/initrd files. */
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#define KEXEC_FILE_SIZE_MAX min_t(s64, 4LL << 30, SSIZE_MAX)
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/*
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* Currently this is the only default function that is exported as some
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* architectures need it to do additional handlings.
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@ -189,11 +192,12 @@ kimage_file_prepare_segments(struct kimage *image, int kernel_fd, int initrd_fd,
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const char __user *cmdline_ptr,
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unsigned long cmdline_len, unsigned flags)
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{
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int ret;
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ssize_t ret;
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void *ldata;
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ret = kernel_read_file_from_fd(kernel_fd, 0, &image->kernel_buf,
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INT_MAX, NULL, READING_KEXEC_IMAGE);
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KEXEC_FILE_SIZE_MAX, NULL,
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READING_KEXEC_IMAGE);
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if (ret < 0)
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return ret;
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image->kernel_buf_len = ret;
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@ -213,7 +217,7 @@ kimage_file_prepare_segments(struct kimage *image, int kernel_fd, int initrd_fd,
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/* It is possible that there no initramfs is being loaded */
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if (!(flags & KEXEC_FILE_NO_INITRAMFS)) {
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ret = kernel_read_file_from_fd(initrd_fd, 0, &image->initrd_buf,
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INT_MAX, NULL,
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KEXEC_FILE_SIZE_MAX, NULL,
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READING_KEXEC_INITRAMFS);
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if (ret < 0)
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goto out;
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