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73b0f62649
commit 815069ca57 upstream.
Note that unlike RFI which is patched only in kernel the nospec state
reflects settings at the time the module was loaded.
Iterating all modules and re-patching every time the settings change
is not implemented.
Based on lwsync patching.
Signed-off-by: Michal Suchanek <msuchanek@suse.de>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Sasha Levin <sashal@kernel.org>
91 lines
2.7 KiB
C
91 lines
2.7 KiB
C
/* Kernel module help for powerpc.
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Copyright (C) 2001, 2003 Rusty Russell IBM Corporation.
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Copyright (C) 2008 Freescale Semiconductor, Inc.
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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 as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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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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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/elf.h>
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#include <linux/moduleloader.h>
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#include <linux/err.h>
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#include <linux/vmalloc.h>
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#include <linux/bug.h>
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#include <asm/module.h>
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#include <asm/uaccess.h>
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#include <asm/firmware.h>
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#include <linux/sort.h>
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#include <asm/setup.h>
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static LIST_HEAD(module_bug_list);
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static const Elf_Shdr *find_section(const Elf_Ehdr *hdr,
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const Elf_Shdr *sechdrs,
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const char *name)
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{
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char *secstrings;
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unsigned int i;
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secstrings = (char *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
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for (i = 1; i < hdr->e_shnum; i++)
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if (strcmp(secstrings+sechdrs[i].sh_name, name) == 0)
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return &sechdrs[i];
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return NULL;
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}
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int module_finalize(const Elf_Ehdr *hdr,
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const Elf_Shdr *sechdrs, struct module *me)
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{
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const Elf_Shdr *sect;
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int rc;
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rc = module_finalize_ftrace(me, sechdrs);
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if (rc)
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return rc;
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/* Apply feature fixups */
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sect = find_section(hdr, sechdrs, "__ftr_fixup");
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if (sect != NULL)
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do_feature_fixups(cur_cpu_spec->cpu_features,
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(void *)sect->sh_addr,
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(void *)sect->sh_addr + sect->sh_size);
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sect = find_section(hdr, sechdrs, "__mmu_ftr_fixup");
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if (sect != NULL)
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do_feature_fixups(cur_cpu_spec->mmu_features,
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(void *)sect->sh_addr,
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(void *)sect->sh_addr + sect->sh_size);
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#ifdef CONFIG_PPC64
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sect = find_section(hdr, sechdrs, "__fw_ftr_fixup");
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if (sect != NULL)
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do_feature_fixups(powerpc_firmware_features,
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(void *)sect->sh_addr,
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(void *)sect->sh_addr + sect->sh_size);
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sect = find_section(hdr, sechdrs, "__spec_barrier_fixup");
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if (sect != NULL)
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do_barrier_nospec_fixups_range(barrier_nospec_enabled,
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(void *)sect->sh_addr,
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(void *)sect->sh_addr + sect->sh_size);
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#endif
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sect = find_section(hdr, sechdrs, "__lwsync_fixup");
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if (sect != NULL)
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do_lwsync_fixups(cur_cpu_spec->cpu_features,
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(void *)sect->sh_addr,
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(void *)sect->sh_addr + sect->sh_size);
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return 0;
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}
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