110febc014
Currently enabling this triggers a warning | usercopy: Kernel memory overwrite attempt detected to kernel text (offset 155633, size 11)! | usercopy: BUG: failure at mm/usercopy.c:99/usercopy_abort()! | |gcc generated __builtin_trap |Path: /bin/busybox |CPU: 0 PID: 84 Comm: init Not tainted 5.4.22 | |[ECR ]: 0x00090005 => gcc generated __builtin_trap |[EFA ]: 0x9024fcaa |[BLINK ]: usercopy_abort+0x8a/0x8c |[ERET ]: memfd_fcntl+0x0/0x470 |[STAT32]: 0x80080802 : IE K |... |... |Stack Trace: | memfd_fcntl+0x0/0x470 | usercopy_abort+0x8a/0x8c | __check_object_size+0x10e/0x138 | copy_strings+0x1f4/0x38c | __do_execve_file+0x352/0x848 | EV_Trap+0xcc/0xd0 The issue is triggered by an allocation in "init reclaimed" region. ARC _stext emcompasses the init region (for historical reasons we wanted the init.text to be under .text as well). This however trips up __check_object_size()->check_kernel_text_object() which treats this as object bleeding into kernel text. Fix that by rezoning _stext to start from regular kernel .text and leave out .init altogether. Fixes: https://github.com/foss-for-synopsys-dwc-arc-processors/linux/issues/15 Reported-by: Evgeniy Didin <didin@synopsys.com> Reviewed-by: Kees Cook <keescook@chromium.org> Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
155 lines
2.9 KiB
ArmAsm
155 lines
2.9 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
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*/
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#include <asm-generic/vmlinux.lds.h>
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#include <asm/cache.h>
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#include <asm/page.h>
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#include <asm/thread_info.h>
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OUTPUT_ARCH(arc)
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ENTRY(res_service)
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#ifdef CONFIG_CPU_BIG_ENDIAN
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jiffies = jiffies_64 + 4;
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#else
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jiffies = jiffies_64;
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#endif
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SECTIONS
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{
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/*
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* ICCM starts at 0x8000_0000. So if kernel is relocated to some other
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* address, make sure peripheral at 0x8z doesn't clash with ICCM
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* Essentially vector is also in ICCM.
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*/
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. = CONFIG_LINUX_LINK_BASE;
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_int_vec_base_lds = .;
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.vector : {
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*(.vector)
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. = ALIGN(PAGE_SIZE);
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}
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#ifdef CONFIG_ARC_HAS_ICCM
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.text.arcfp : {
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*(.text.arcfp)
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. = ALIGN(CONFIG_ARC_ICCM_SZ * 1024);
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}
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#endif
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/*
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* The reason for having a seperate subsection .init.ramfs is to
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* prevent objump from including it in kernel dumps
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*
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* Reason for having .init.ramfs above .init is to make sure that the
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* binary blob is tucked away to one side, reducing the displacement
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* between .init.text and .text, avoiding any possible relocation
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* errors because of calls from .init.text to .text
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* Yes such calls do exist. e.g.
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* decompress_inflate.c:gunzip( ) -> zlib_inflate_workspace( )
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*/
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__init_begin = .;
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.init.ramfs : { INIT_RAM_FS }
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. = ALIGN(PAGE_SIZE);
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HEAD_TEXT_SECTION
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INIT_TEXT_SECTION(L1_CACHE_BYTES)
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/* INIT_DATA_SECTION open-coded: special INIT_RAM_FS handling */
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.init.data : {
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INIT_DATA
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INIT_SETUP(L1_CACHE_BYTES)
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INIT_CALLS
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CON_INITCALL
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}
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.init.arch.info : {
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__arch_info_begin = .;
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*(.arch.info.init)
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__arch_info_end = .;
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}
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PERCPU_SECTION(L1_CACHE_BYTES)
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. = ALIGN(PAGE_SIZE);
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__init_end = .;
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.text : {
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_text = .;
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_stext = .;
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TEXT_TEXT
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SCHED_TEXT
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CPUIDLE_TEXT
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LOCK_TEXT
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KPROBES_TEXT
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*(.fixup)
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*(.gnu.warning)
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}
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EXCEPTION_TABLE(L1_CACHE_BYTES)
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_etext = .;
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_sdata = .;
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RO_DATA(PAGE_SIZE)
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/*
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* 1. this is .data essentially
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* 2. THREAD_SIZE for init.task, must be kernel-stk sz aligned
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*/
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RW_DATA(L1_CACHE_BYTES, PAGE_SIZE, THREAD_SIZE)
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_edata = .;
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BSS_SECTION(4, 4, 4)
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#ifdef CONFIG_ARC_DW2_UNWIND
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. = ALIGN(PAGE_SIZE);
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.eh_frame : {
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__start_unwind = .;
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*(.eh_frame)
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__end_unwind = .;
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}
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#else
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/DISCARD/ : { *(.eh_frame) }
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#endif
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. = ALIGN(PAGE_SIZE);
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_end = . ;
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STABS_DEBUG
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ELF_DETAILS
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DISCARDS
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.arcextmap 0 : {
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*(.gnu.linkonce.arcextmap.*)
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*(.arcextmap.*)
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}
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#ifndef CONFIG_DEBUG_INFO
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/DISCARD/ : { *(.debug_frame) }
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/DISCARD/ : { *(.debug_aranges) }
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/DISCARD/ : { *(.debug_pubnames) }
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/DISCARD/ : { *(.debug_info) }
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/DISCARD/ : { *(.debug_abbrev) }
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/DISCARD/ : { *(.debug_line) }
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/DISCARD/ : { *(.debug_str) }
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/DISCARD/ : { *(.debug_loc) }
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/DISCARD/ : { *(.debug_macinfo) }
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/DISCARD/ : { *(.debug_ranges) }
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#endif
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#ifdef CONFIG_ARC_HAS_DCCM
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. = CONFIG_ARC_DCCM_BASE;
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__arc_dccm_base = .;
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.data.arcfp : {
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*(.data.arcfp)
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}
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. = ALIGN(CONFIG_ARC_DCCM_SZ * 1024);
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#endif
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}
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