mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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8a7f97b902
Add check for the return value of memblock_alloc*() functions and call
panic() in case of error. The panic message repeats the one used by
panicing memblock allocators with adjustment of parameters to include
only relevant ones.
The replacement was mostly automated with semantic patches like the one
below with manual massaging of format strings.
@@
expression ptr, size, align;
@@
ptr = memblock_alloc(size, align);
+ if (!ptr)
+ panic("%s: Failed to allocate %lu bytes align=0x%lx\n", __func__, size, align);
[anders.roxell@linaro.org: use '%pa' with 'phys_addr_t' type]
Link: http://lkml.kernel.org/r/20190131161046.21886-1-anders.roxell@linaro.org
[rppt@linux.ibm.com: fix format strings for panics after memblock_alloc]
Link: http://lkml.kernel.org/r/1548950940-15145-1-git-send-email-rppt@linux.ibm.com
[rppt@linux.ibm.com: don't panic if the allocation in sparse_buffer_init fails]
Link: http://lkml.kernel.org/r/20190131074018.GD28876@rapoport-lnx
[akpm@linux-foundation.org: fix xtensa printk warning]
Link: http://lkml.kernel.org/r/1548057848-15136-20-git-send-email-rppt@linux.ibm.com
Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>
Signed-off-by: Anders Roxell <anders.roxell@linaro.org>
Reviewed-by: Guo Ren <ren_guo@c-sky.com> [c-sky]
Acked-by: Paul Burton <paul.burton@mips.com> [MIPS]
Acked-by: Heiko Carstens <heiko.carstens@de.ibm.com> [s390]
Reviewed-by: Juergen Gross <jgross@suse.com> [Xen]
Reviewed-by: Geert Uytterhoeven <geert@linux-m68k.org> [m68k]
Acked-by: Max Filippov <jcmvbkbc@gmail.com> [xtensa]
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Christophe Leroy <christophe.leroy@c-s.fr>
Cc: Christoph Hellwig <hch@lst.de>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Dennis Zhou <dennis@kernel.org>
Cc: Greentime Hu <green.hu@gmail.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Guan Xuetao <gxt@pku.edu.cn>
Cc: Guo Ren <guoren@kernel.org>
Cc: Mark Salter <msalter@redhat.com>
Cc: Matt Turner <mattst88@gmail.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Michal Simek <monstr@monstr.eu>
Cc: Petr Mladek <pmladek@suse.com>
Cc: Richard Weinberger <richard@nod.at>
Cc: Rich Felker <dalias@libc.org>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: Rob Herring <robh@kernel.org>
Cc: Russell King <linux@armlinux.org.uk>
Cc: Stafford Horne <shorne@gmail.com>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Vineet Gupta <vgupta@synopsys.com>
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
104 lines
2.8 KiB
C
104 lines
2.8 KiB
C
/*
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* Xtensa KASAN shadow map initialization
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 2017 Cadence Design Systems Inc.
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*/
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#include <linux/memblock.h>
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#include <linux/init_task.h>
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#include <linux/kasan.h>
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#include <linux/kernel.h>
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#include <asm/initialize_mmu.h>
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#include <asm/tlbflush.h>
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#include <asm/traps.h>
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void __init kasan_early_init(void)
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{
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unsigned long vaddr = KASAN_SHADOW_START;
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pgd_t *pgd = pgd_offset_k(vaddr);
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pmd_t *pmd = pmd_offset(pgd, vaddr);
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int i;
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for (i = 0; i < PTRS_PER_PTE; ++i)
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set_pte(kasan_early_shadow_pte + i,
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mk_pte(virt_to_page(kasan_early_shadow_page),
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PAGE_KERNEL));
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for (vaddr = 0; vaddr < KASAN_SHADOW_SIZE; vaddr += PMD_SIZE, ++pmd) {
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BUG_ON(!pmd_none(*pmd));
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set_pmd(pmd, __pmd((unsigned long)kasan_early_shadow_pte));
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}
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early_trap_init();
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}
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static void __init populate(void *start, void *end)
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{
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unsigned long n_pages = (end - start) / PAGE_SIZE;
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unsigned long n_pmds = n_pages / PTRS_PER_PTE;
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unsigned long i, j;
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unsigned long vaddr = (unsigned long)start;
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pgd_t *pgd = pgd_offset_k(vaddr);
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pmd_t *pmd = pmd_offset(pgd, vaddr);
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pte_t *pte = memblock_alloc(n_pages * sizeof(pte_t), PAGE_SIZE);
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if (!pte)
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panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
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__func__, n_pages * sizeof(pte_t), PAGE_SIZE);
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pr_debug("%s: %p - %p\n", __func__, start, end);
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for (i = j = 0; i < n_pmds; ++i) {
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int k;
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for (k = 0; k < PTRS_PER_PTE; ++k, ++j) {
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phys_addr_t phys =
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memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE);
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if (!phys)
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panic("Failed to allocate page table page\n");
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set_pte(pte + j, pfn_pte(PHYS_PFN(phys), PAGE_KERNEL));
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}
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}
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for (i = 0; i < n_pmds ; ++i, pte += PTRS_PER_PTE)
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set_pmd(pmd + i, __pmd((unsigned long)pte));
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local_flush_tlb_all();
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memset(start, 0, end - start);
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}
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void __init kasan_init(void)
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{
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int i;
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BUILD_BUG_ON(KASAN_SHADOW_OFFSET != KASAN_SHADOW_START -
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(KASAN_START_VADDR >> KASAN_SHADOW_SCALE_SHIFT));
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BUILD_BUG_ON(VMALLOC_START < KASAN_START_VADDR);
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/*
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* Replace shadow map pages that cover addresses from VMALLOC area
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* start to the end of KSEG with clean writable pages.
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*/
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populate(kasan_mem_to_shadow((void *)VMALLOC_START),
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kasan_mem_to_shadow((void *)XCHAL_KSEG_BYPASS_VADDR));
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/*
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* Write protect kasan_early_shadow_page and zero-initialize it again.
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*/
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for (i = 0; i < PTRS_PER_PTE; ++i)
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set_pte(kasan_early_shadow_pte + i,
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mk_pte(virt_to_page(kasan_early_shadow_page),
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PAGE_KERNEL_RO));
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local_flush_tlb_all();
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memset(kasan_early_shadow_page, 0, PAGE_SIZE);
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/* At this point kasan is fully initialized. Enable error messages. */
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current->kasan_depth = 0;
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pr_info("KernelAddressSanitizer initialized\n");
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}
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