Messages in this thread Patch in this message | | | Date | Sun, 5 Aug 2018 13:31:55 -0700 | From | tip-bot for Dave Hansen <> | Subject | [tip:x86/pti] x86/mm/init: Pass unconverted symbol addresses to free_init_pages() |
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Commit-ID: 9f515cdb411ef34f1aaf4c40bb0c932cf6db5de1 Gitweb: https://git.kernel.org/tip/9f515cdb411ef34f1aaf4c40bb0c932cf6db5de1 Author: Dave Hansen <dave.hansen@linux.intel.com> AuthorDate: Thu, 2 Aug 2018 15:58:28 -0700 Committer: Thomas Gleixner <tglx@linutronix.de> CommitDate: Sun, 5 Aug 2018 22:21:02 +0200
x86/mm/init: Pass unconverted symbol addresses to free_init_pages()
The x86 code has several places where it frees parts of kernel image:
1. Unused SMP alternative 2. __init code 3. The hole between text and rodata 4. The hole between rodata and data
We call free_init_pages() to do this. Strangely, we convert the symbol addresses to kernel direct map addresses in some cases (#3, #4) but not others (#1, #2).
The virt_to_page() and the other code in free_reserved_area() now works fine for for symbol addresses on x86, so don't bother converting the addresses to direct map addresses before freeing them.
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: keescook@google.com Cc: aarcange@redhat.com Cc: jgross@suse.com Cc: jpoimboe@redhat.com Cc: gregkh@linuxfoundation.org Cc: peterz@infradead.org Cc: hughd@google.com Cc: torvalds@linux-foundation.org Cc: bp@alien8.de Cc: luto@kernel.org Cc: ak@linux.intel.com Cc: Kees Cook <keescook@google.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: Juergen Gross <jgross@suse.com> Cc: Josh Poimboeuf <jpoimboe@redhat.com> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Hugh Dickins <hughd@google.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Andy Lutomirski <luto@kernel.org> Cc: Andi Kleen <ak@linux.intel.com> Link: https://lkml.kernel.org/r/20180802225828.89B2D0E2@viggo.jf.intel.com
--- arch/x86/mm/init_64.c | 8 ++------ 1 file changed, 2 insertions(+), 6 deletions(-)
diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c index a688617c727e..73158655c4a7 100644 --- a/arch/x86/mm/init_64.c +++ b/arch/x86/mm/init_64.c @@ -1283,12 +1283,8 @@ void mark_rodata_ro(void) set_memory_ro(start, (end-start) >> PAGE_SHIFT); #endif - free_init_pages("unused kernel", - (unsigned long) __va(__pa_symbol(text_end)), - (unsigned long) __va(__pa_symbol(rodata_start))); - free_init_pages("unused kernel", - (unsigned long) __va(__pa_symbol(rodata_end)), - (unsigned long) __va(__pa_symbol(_sdata))); + free_init_pages("unused kernel", text_end, rodata_start); + free_init_pages("unused kernel", rodata_end, _sdata); debug_checkwx();
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