system/linux
system/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux synced 2024-09-06 18:01:05 +00:00
Code Issues Packages Projects Releases Wiki Activity

MIPS: KASLR: Print relocation Information on boot

Browse source 
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>
This commit is contained in:
Matt Redfearn 2016-03-31 10:05:42 +01:00 committed by Ralf Baechle
parent 405bc8fd12
commit 919beb4eed
1 changed files with 9 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

9
arch/mips/kernel/setup.c
View file

@ -477,9 +477,18 @@ static void __init bootmem_init(void)
*/
if (__pa_symbol(_text) > __pa_symbol(VMLINUX_LOAD_ADDRESS)) {
unsigned long offset;
extern void show_kernel_relocation(const char *level);
offset = __pa_symbol(_text) - __pa_symbol(VMLINUX_LOAD_ADDRESS);
free_bootmem(__pa_symbol(VMLINUX_LOAD_ADDRESS), offset);
#if defined(CONFIG_DEBUG_KERNEL) && defined(CONFIG_DEBUG_INFO)
/*
* This information is necessary when debugging the kernel
* But is a security vulnerability otherwise!
*/
show_kernel_relocation(KERN_INFO);
#endif
}
#endif