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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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451286940d
On 64-bit, the kernel must be placed below MAXMEM (64TiB with 4-level paging or 4PiB with 5-level paging). This is currently not enforced by KASLR, which thus implicitly relies on physical memory being limited to less than 64TiB. On 32-bit, the limit is KERNEL_IMAGE_SIZE (512MiB). This is enforced by special checks in __process_mem_region(). Initialize mem_limit to the maximum (depending on architecture), instead of ULLONG_MAX, and make sure the command-line arguments can only decrease it. This makes the enforcement explicit on 64-bit, and eliminates the 32-bit specific checks to keep the kernel below 512M. Check upfront to make sure the minimum address is below the limit before doing any work. Signed-off-by: Arvind Sankar <nivedita@alum.mit.edu> Signed-off-by: Ingo Molnar <mingo@kernel.org> Acked-by: Kees Cook <keescook@chromium.org> Link: https://lore.kernel.org/r/20200727230801.3468620-5-nivedita@alum.mit.edu |
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| .. | ||
| .gitignore | ||
| acpi.c | ||
| cmdline.c | ||
| cpuflags.c | ||
| early_serial_console.c | ||
| efi_thunk_64.S | ||
| error.c | ||
| error.h | ||
| head_32.S | ||
| head_64.S | ||
| kaslr_64.c | ||
| kaslr.c | ||
| kernel_info.S | ||
| Makefile | ||
| mem_encrypt.S | ||
| misc.c | ||
| misc.h | ||
| mkpiggy.c | ||
| pgtable_64.c | ||
| pgtable.h | ||
| string.c | ||
| vmlinux.lds.S | ||