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1404d6f13e
Page mappings with full RWX permissions are a security risk. x86
has an option to walk the page tables and dump any bad pages.
(See e1a58320a3 ("x86/mm: Warn on W^X mappings")). Add a similar
implementation for arm64.
Reviewed-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Mark Rutland <mark.rutland@arm.com>
Tested-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Laura Abbott <labbott@redhat.com>
Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
[catalin.marinas@arm.com: folded fix for KASan out of bounds from Mark Rutland]
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
55 lines
1.4 KiB
C
55 lines
1.4 KiB
C
/*
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* Copyright (C) 2014 ARM Ltd.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef __ASM_PTDUMP_H
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#define __ASM_PTDUMP_H
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#ifdef CONFIG_ARM64_PTDUMP_CORE
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#include <linux/mm_types.h>
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#include <linux/seq_file.h>
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struct addr_marker {
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unsigned long start_address;
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char *name;
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};
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struct ptdump_info {
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struct mm_struct *mm;
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const struct addr_marker *markers;
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unsigned long base_addr;
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};
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void ptdump_walk_pgd(struct seq_file *s, struct ptdump_info *info);
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#ifdef CONFIG_ARM64_PTDUMP_DEBUGFS
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int ptdump_debugfs_register(struct ptdump_info *info, const char *name);
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#else
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static inline int ptdump_debugfs_register(struct ptdump_info *info,
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const char *name)
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{
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return 0;
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}
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#endif
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void ptdump_check_wx(void);
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#endif /* CONFIG_ARM64_PTDUMP_CORE */
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#ifdef CONFIG_DEBUG_WX
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#define debug_checkwx() ptdump_check_wx()
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#else
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#define debug_checkwx() do { } while (0)
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#endif
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#endif /* __ASM_PTDUMP_H */
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