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author | android-build-team Robot <android-build-team-robot@google.com> | 2017-07-18 07:53:27 +0000 |
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committer | android-build-team Robot <android-build-team-robot@google.com> | 2017-07-18 07:53:27 +0000 |
commit | 2684a6c505531426bb7d4c8a68aab91abe6af05c (patch) | |
tree | 1636806f0c5f37c506bf5b38aa7ee3e7c4c48644 /arch/arm64/kernel/setup.c | |
parent | 39b9a227eb927f4a8963f60d763bd43fa5b2bb5b (diff) | |
parent | cc3d2b7361cf10851f579da257fdf2f1a7bd66b4 (diff) | |
download | v4.4-2684a6c505531426bb7d4c8a68aab91abe6af05c.tar.gz |
release-request-b8734135-c578-454d-bc9f-628062b9de89-for-git_nyc-iot-release-4188548 snap-temp-L42600000083191324
Change-Id: If12f2ca34c92ce87169ba986b5b24a1b6b377a3d
Diffstat (limited to 'arch/arm64/kernel/setup.c')
-rw-r--r-- | arch/arm64/kernel/setup.c | 47 |
1 files changed, 46 insertions, 1 deletions
diff --git a/arch/arm64/kernel/setup.c b/arch/arm64/kernel/setup.c index 8119479147db..6591bf23422b 100644 --- a/arch/arm64/kernel/setup.c +++ b/arch/arm64/kernel/setup.c @@ -62,6 +62,7 @@ #include <asm/memblock.h> #include <asm/efi.h> #include <asm/xen/hypervisor.h> +#include <asm/mmu_context.h> phys_addr_t __fdt_pointer __initdata; @@ -201,7 +202,7 @@ static void __init request_standard_resources(void) struct resource *res; kernel_code.start = virt_to_phys(_text); - kernel_code.end = virt_to_phys(_etext - 1); + kernel_code.end = virt_to_phys(__init_begin - 1); kernel_data.start = virt_to_phys(_sdata); kernel_data.end = virt_to_phys(_end - 1); @@ -313,6 +314,12 @@ void __init setup_arch(char **cmdline_p) */ local_async_enable(); + /* + * TTBR0 is only used for the identity mapping at this stage. Make it + * point to zero page to avoid speculatively fetching new entries. + */ + cpu_uninstall_idmap(); + efi_init(); arm64_memblock_init(); @@ -340,6 +347,15 @@ void __init setup_arch(char **cmdline_p) smp_init_cpus(); smp_build_mpidr_hash(); +#ifdef CONFIG_ARM64_SW_TTBR0_PAN + /* + * Make sure init_thread_info.ttbr0 always generates translation + * faults in case uaccess_enable() is inadvertently called by the init + * thread. + */ + init_thread_info.ttbr0 = virt_to_phys(empty_zero_page); +#endif + #ifdef CONFIG_VT #if defined(CONFIG_VGA_CONSOLE) conswitchp = &vga_con; @@ -381,3 +397,32 @@ static int __init topology_init(void) return 0; } subsys_initcall(topology_init); + +/* + * Dump out kernel offset information on panic. + */ +static int dump_kernel_offset(struct notifier_block *self, unsigned long v, + void *p) +{ + u64 const kaslr_offset = kimage_vaddr - KIMAGE_VADDR; + + if (IS_ENABLED(CONFIG_RANDOMIZE_BASE) && kaslr_offset > 0) { + pr_emerg("Kernel Offset: 0x%llx from 0x%lx\n", + kaslr_offset, KIMAGE_VADDR); + } else { + pr_emerg("Kernel Offset: disabled\n"); + } + return 0; +} + +static struct notifier_block kernel_offset_notifier = { + .notifier_call = dump_kernel_offset +}; + +static int __init register_kernel_offset_dumper(void) +{ + atomic_notifier_chain_register(&panic_notifier_list, + &kernel_offset_notifier); + return 0; +} +__initcall(register_kernel_offset_dumper); |