change system file

hc

2024-10-09 244b2c5ca8b14627e4a17755e5922221e121c771

 kernel/kernel/kexec_file.c
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@@ -343,7 +343,7 @@
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 	image = NULL;
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-	if (!mutex_trylock(&kexec_mutex))
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+	if (!kexec_trylock())
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 		return -EBUSY;
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 	dest_image = &kexec_image;
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@@ -415,7 +415,7 @@
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 	if ((flags & KEXEC_FILE_ON_CRASH) && kexec_crash_image)
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 		arch_kexec_protect_crashkres();
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-	mutex_unlock(&kexec_mutex);
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+	kexec_unlock();
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 	kimage_free(image);
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 	return ret;
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 }
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@@ -910,10 +910,22 @@
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 		}
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 		offset = ALIGN(offset, align);
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+
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+		/*
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+		 * Check if the segment contains the entry point, if so,
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+		 * calculate the value of image->start based on it.
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+		 * If the compiler has produced more than one .text section
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+		 * (Eg: .text.hot), they are generally after the main .text
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+		 * section, and they shall not be used to calculate
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+		 * image->start. So do not re-calculate image->start if it
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+		 * is not set to the initial value, and warn the user so they
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+		 * have a chance to fix their purgatory's linker script.
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+		 */
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 		if (sechdrs[i].sh_flags & SHF_EXECINSTR &&
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 		    pi->ehdr->e_entry >= sechdrs[i].sh_addr &&
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 		    pi->ehdr->e_entry < (sechdrs[i].sh_addr
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-					 + sechdrs[i].sh_size)) {
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+					 + sechdrs[i].sh_size) &&
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+		    !WARN_ON(kbuf->image->start != pi->ehdr->e_entry)) {
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 			kbuf->image->start -= sechdrs[i].sh_addr;
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 			kbuf->image->start += kbuf->mem + offset;
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 		}