From 5331d2c7efbccab436aa11639d7fa00a1d58abe2 Mon Sep 17 00:00:00 2001 From: Zhimin Gu Date: Fri, 21 Sep 2018 14:28:32 +0800 Subject: x86-32, hibernate: Set up temporary text mapping for 32bit system Set up the temporary text mapping for the final jump address so that the system could jump to the right address after all the pages have been copied back to their original address - otherwise the final mapping for the jump address is invalid. Analogous changes were made for 64-bit in commit 65c0554b73c9 (x86/power/64: Fix kernel text mapping corruption during image restoration). Signed-off-by: Zhimin Gu Acked-by: Pavel Machek Signed-off-by: Chen Yu Acked-by: Thomas Gleixner Signed-off-by: Rafael J. Wysocki --- arch/x86/power/hibernate_32.c | 31 +++++++++++++++++++++++++++++++ 1 file changed, 31 insertions(+) (limited to 'arch/x86/power/hibernate_32.c') diff --git a/arch/x86/power/hibernate_32.c b/arch/x86/power/hibernate_32.c index a9861095fbb8..15695e30f982 100644 --- a/arch/x86/power/hibernate_32.c +++ b/arch/x86/power/hibernate_32.c @@ -143,6 +143,32 @@ static inline void resume_init_first_level_page_table(pgd_t *pg_dir) #endif } +static int set_up_temporary_text_mapping(pgd_t *pgd_base) +{ + pgd_t *pgd; + pmd_t *pmd; + pte_t *pte; + + pgd = pgd_base + pgd_index(restore_jump_address); + + pmd = resume_one_md_table_init(pgd); + if (!pmd) + return -ENOMEM; + + if (boot_cpu_has(X86_FEATURE_PSE)) { + set_pmd(pmd + pmd_index(restore_jump_address), + __pmd((jump_address_phys & PMD_MASK) | pgprot_val(PAGE_KERNEL_LARGE_EXEC))); + } else { + pte = resume_one_page_table_init(pmd); + if (!pte) + return -ENOMEM; + set_pte(pte + pte_index(restore_jump_address), + __pte((jump_address_phys & PAGE_MASK) | pgprot_val(PAGE_KERNEL_EXEC))); + } + + return 0; +} + asmlinkage int swsusp_arch_resume(void) { int error; @@ -152,6 +178,11 @@ asmlinkage int swsusp_arch_resume(void) return -ENOMEM; resume_init_first_level_page_table(resume_pg_dir); + + error = set_up_temporary_text_mapping(resume_pg_dir); + if (error) + return error; + error = resume_physical_mapping_init(resume_pg_dir); if (error) return error; -- cgit v1.2.3