p71924506
/
linux_old1
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

x86/mm: Report which part of kernel image is freed 

The memory freeing report wasn't very useful for figuring out which
parts of the kernel image were being freed. Add the details for clearer
reporting in dmesg.

Before:

  Freeing unused kernel image memory: 1348K
  Write protecting the kernel read-only data: 20480k
  Freeing unused kernel image memory: 2040K
  Freeing unused kernel image memory: 172K

After:

  Freeing unused kernel image (initmem) memory: 1348K
  Write protecting the kernel read-only data: 20480k
  Freeing unused kernel image (text/rodata gap) memory: 2040K
  Freeing unused kernel image (rodata/data gap) memory: 172K

Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: linux-alpha@vger.kernel.org
Cc: linux-arch@vger.kernel.org
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-c6x-dev@linux-c6x.org
Cc: linux-ia64@vger.kernel.org
Cc: linuxppc-dev@lists.ozlabs.org
Cc: linux-s390@vger.kernel.org
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Michal Simek <monstr@monstr.eu>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rick Edgecombe <rick.p.edgecombe@intel.com>
Cc: Segher Boessenkool <segher@kernel.crashing.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Will Deacon <will@kernel.org>
Cc: x86-ml <x86@kernel.org>
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Link: https://lkml.kernel.org/r/20191029211351.13243-28-keescook@chromium.org
This commit is contained in:
Kees Cook 2019-10-29 14:13:49 -07:00 committed by Borislav Petkov
parent 2d0004d198
commit 5494c3a6a0
3 changed files with 9 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/x86/include/asm/processor.h
View File

@ -958,7 +958,7 @@ static inline uint32_t hypervisor_cpuid_base(const char *sig, uint32_t leaves)
extern unsigned long arch_align_stack(unsigned long sp);
void free_init_pages(const char *what, unsigned long begin, unsigned long end);
extern void free_kernel_image_pages(void *begin, void *end);
extern void free_kernel_image_pages(const char *what, void *begin, void *end);
void default_idle(void);
#ifdef CONFIG_XEN

8
arch/x86/mm/init.c
View File

@ -829,14 +829,13 @@ void free_init_pages(const char *what, unsigned long begin, unsigned long end)
* used for the kernel image only. free_init_pages() will do the
* right thing for either kind of address.
*/
void free_kernel_image_pages(void *begin, void *end)
void free_kernel_image_pages(const char *what, void *begin, void *end)
{
unsigned long begin_ul = (unsigned long)begin;
unsigned long end_ul = (unsigned long)end;
unsigned long len_pages = (end_ul - begin_ul) >> PAGE_SHIFT;
free_init_pages("unused kernel image", begin_ul, end_ul);
free_init_pages(what, begin_ul, end_ul);
/*
* PTI maps some of the kernel into userspace. For performance,
@ -865,7 +864,8 @@ void __ref free_initmem(void)
mem_encrypt_free_decrypted_mem();
free_kernel_image_pages(&__init_begin, &__init_end);
free_kernel_image_pages("unused kernel image (initmem)",
&__init_begin, &__init_end);
}
#ifdef CONFIG_BLK_DEV_INITRD

6
arch/x86/mm/init_64.c
View File

@ -1334,8 +1334,10 @@ void mark_rodata_ro(void)
set_memory_ro(start, (end-start) >> PAGE_SHIFT);
#endif
free_kernel_image_pages((void *)text_end, (void *)rodata_start);
free_kernel_image_pages((void *)rodata_end, (void *)_sdata);
free_kernel_image_pages("unused kernel image (text/rodata gap)",
(void *)text_end, (void *)rodata_start);
free_kernel_image_pages("unused kernel image (rodata/data gap)",
(void *)rodata_end, (void *)_sdata);
debug_checkwx();
}