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MIPS: KASLR: Print relocation Information on boot
When debugging a relocated kernel, the addresses of the relocated symbols and the offset applied is essential information. If the kernel is compiled with debugging information, then print this information during bootup using the same function as the panic notifier. [ralf@linux-mips.org: Fixed spelling mistake pointed out by Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>.] Signed-off-by: Matt Redfearn <matt.redfearn@imgtec.com> Cc: Aaro Koskinen <aaro.koskinen@nokia.com> Cc: Masahiro Yamada <yamada.masahiro@socionext.com> Cc: Alexander Sverdlin <alexander.sverdlin@gmail.com> Cc: Jaedon Shin <jaedon.shin@gmail.com> Cc: Jonas Gorski <jogo@openwrt.org> Cc: Paul Burton <paul.burton@imgtec.com> Cc: linux-mips@linux-mips.org Cc: kernel-hardening@lists.openwall.com Cc: linux-kernel@vger.kernel.org Patchwork: https://patchwork.linux-mips.org/patch/12989/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
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@ -477,9 +477,18 @@ static void __init bootmem_init(void)
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*/
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if (__pa_symbol(_text) > __pa_symbol(VMLINUX_LOAD_ADDRESS)) {
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unsigned long offset;
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extern void show_kernel_relocation(const char *level);
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offset = __pa_symbol(_text) - __pa_symbol(VMLINUX_LOAD_ADDRESS);
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free_bootmem(__pa_symbol(VMLINUX_LOAD_ADDRESS), offset);
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#if defined(CONFIG_DEBUG_KERNEL) && defined(CONFIG_DEBUG_INFO)
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/*
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* This information is necessary when debugging the kernel
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* But is a security vulnerability otherwise!
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*/
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show_kernel_relocation(KERN_INFO);
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#endif
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}
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#endif
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