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author | Linus Torvalds <torvalds@linux-foundation.org> | 2021-02-21 13:08:42 -0800 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2021-02-21 13:08:42 -0800 |
commit | 99ca0edb41aabd888ca1548fa0391a4975740a83 (patch) | |
tree | 8f2327f46b14e603d0bc2d8b5816f278314712da /arch/arm64/kernel/kaslr.c | |
parent | 4a037ad5d115b2cc79a5071a7854475f365476fa (diff) | |
parent | 1ffa9763828cf73a4d4eaa04c29a4a89fb0708c7 (diff) | |
download | linux-99ca0edb41aabd888ca1548fa0391a4975740a83.tar.bz2 |
Merge tag 'arm64-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux
Pull arm64 updates from Will Deacon:
- vDSO build improvements including support for building with BSD.
- Cleanup to the AMU support code and initialisation rework to support
cpufreq drivers built as modules.
- Removal of synthetic frame record from exception stack when entering
the kernel from EL0.
- Add support for the TRNG firmware call introduced by Arm spec
DEN0098.
- Cleanup and refactoring across the board.
- Avoid calling arch_get_random_seed_long() from
add_interrupt_randomness()
- Perf and PMU updates including support for Cortex-A78 and the v8.3
SPE extensions.
- Significant steps along the road to leaving the MMU enabled during
kexec relocation.
- Faultaround changes to initialise prefaulted PTEs as 'old' when
hardware access-flag updates are supported, which drastically
improves vmscan performance.
- CPU errata updates for Cortex-A76 (#1463225) and Cortex-A55
(#1024718)
- Preparatory work for yielding the vector unit at a finer granularity
in the crypto code, which in turn will one day allow us to defer
softirq processing when it is in use.
- Support for overriding CPU ID register fields on the command-line.
* tag 'arm64-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux: (85 commits)
drivers/perf: Replace spin_lock_irqsave to spin_lock
mm: filemap: Fix microblaze build failure with 'mmu_defconfig'
arm64: Make CPU_BIG_ENDIAN depend on ld.bfd or ld.lld 13.0.0+
arm64: cpufeatures: Allow disabling of Pointer Auth from the command-line
arm64: Defer enabling pointer authentication on boot core
arm64: cpufeatures: Allow disabling of BTI from the command-line
arm64: Move "nokaslr" over to the early cpufeature infrastructure
KVM: arm64: Document HVC_VHE_RESTART stub hypercall
arm64: Make kvm-arm.mode={nvhe, protected} an alias of id_aa64mmfr1.vh=0
arm64: Add an aliasing facility for the idreg override
arm64: Honor VHE being disabled from the command-line
arm64: Allow ID_AA64MMFR1_EL1.VH to be overridden from the command line
arm64: cpufeature: Add an early command-line cpufeature override facility
arm64: Extract early FDT mapping from kaslr_early_init()
arm64: cpufeature: Use IDreg override in __read_sysreg_by_encoding()
arm64: cpufeature: Add global feature override facility
arm64: Move SCTLR_EL1 initialisation to EL-agnostic code
arm64: Simplify init_el2_state to be non-VHE only
arm64: Move VHE-specific SPE setup to mutate_to_vhe()
arm64: Drop early setting of MDSCR_EL2.TPMS
...
Diffstat (limited to 'arch/arm64/kernel/kaslr.c')
-rw-r--r-- | arch/arm64/kernel/kaslr.c | 43 |
1 files changed, 5 insertions, 38 deletions
diff --git a/arch/arm64/kernel/kaslr.c b/arch/arm64/kernel/kaslr.c index 1c74c45b9494..27f8939deb1b 100644 --- a/arch/arm64/kernel/kaslr.c +++ b/arch/arm64/kernel/kaslr.c @@ -19,6 +19,7 @@ #include <asm/memory.h> #include <asm/mmu.h> #include <asm/sections.h> +#include <asm/setup.h> enum kaslr_status { KASLR_ENABLED, @@ -50,39 +51,7 @@ static __init u64 get_kaslr_seed(void *fdt) return ret; } -static __init bool cmdline_contains_nokaslr(const u8 *cmdline) -{ - const u8 *str; - - str = strstr(cmdline, "nokaslr"); - return str == cmdline || (str > cmdline && *(str - 1) == ' '); -} - -static __init bool is_kaslr_disabled_cmdline(void *fdt) -{ - if (!IS_ENABLED(CONFIG_CMDLINE_FORCE)) { - int node; - const u8 *prop; - - node = fdt_path_offset(fdt, "/chosen"); - if (node < 0) - goto out; - - prop = fdt_getprop(fdt, node, "bootargs", NULL); - if (!prop) - goto out; - - if (cmdline_contains_nokaslr(prop)) - return true; - - if (IS_ENABLED(CONFIG_CMDLINE_EXTEND)) - goto out; - - return false; - } -out: - return cmdline_contains_nokaslr(CONFIG_CMDLINE); -} +struct arm64_ftr_override kaslr_feature_override __initdata; /* * This routine will be executed with the kernel mapped at its default virtual @@ -92,12 +61,11 @@ out: * containing function pointers) to be reinitialized, and zero-initialized * .bss variables will be reset to 0. */ -u64 __init kaslr_early_init(u64 dt_phys) +u64 __init kaslr_early_init(void) { void *fdt; u64 seed, offset, mask, module_range; unsigned long raw; - int size; /* * Set a reasonable default for module_alloc_base in case @@ -111,8 +79,7 @@ u64 __init kaslr_early_init(u64 dt_phys) * and proceed with KASLR disabled. We will make another * attempt at mapping the FDT in setup_machine() */ - early_fixmap_init(); - fdt = fixmap_remap_fdt(dt_phys, &size, PAGE_KERNEL); + fdt = get_early_fdt_ptr(); if (!fdt) { kaslr_status = KASLR_DISABLED_FDT_REMAP; return 0; @@ -127,7 +94,7 @@ u64 __init kaslr_early_init(u64 dt_phys) * Check if 'nokaslr' appears on the command line, and * return 0 if that is the case. */ - if (is_kaslr_disabled_cmdline(fdt)) { + if (kaslr_feature_override.val & kaslr_feature_override.mask & 0xf) { kaslr_status = KASLR_DISABLED_CMDLINE; return 0; } |