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powerpc fixes for 4.19 #4

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Four regression fixes.
 
 A fix for a change to lib/xz which broke our zImage loader when building with XZ
 compression. OK'ed by Herbert who merged the original patch.
 
 The recent fix we did to avoid patching __init text broke some 32-bit machines,
 fix that.
 
 Our show_user_instructions() could be tricked into printing kernel memory, add a
 check to avoid that.
 
 And a fix for a change to our NUMA initialisation logic, which causes crashes in
 some kdump configurations.
 
 Thanks to:
   Christophe Leroy, Hari Bathini, Jann Horn, Joel Stanley, Meelis Roos, Murilo
   Opsfelder Araujo, Srikar Dronamraju.
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Merge tag 'powerpc-4.19-4' of https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux

Michael writes:
  "powerpc fixes for 4.19 #4

   Four regression fixes.

   A fix for a change to lib/xz which broke our zImage loader when
   building with XZ compression. OK'ed by Herbert who merged the
   original patch.

   The recent fix we did to avoid patching __init text broke some 32-bit
   machines, fix that.

   Our show_user_instructions() could be tricked into printing kernel
   memory, add a check to avoid that.

   And a fix for a change to our NUMA initialisation logic, which causes
   crashes in some kdump configurations.

   Thanks to:
     Christophe Leroy, Hari Bathini, Jann Horn, Joel Stanley, Meelis
     Roos, Murilo Opsfelder Araujo, Srikar Dronamraju."

* tag 'powerpc-4.19-4' of https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux:
  powerpc/numa: Skip onlining a offline node in kdump path
  powerpc: Don't print kernel instructions in show_user_instructions()
  powerpc/lib: fix book3s/32 boot failure due to code patching
  lib/xz: Put CRC32_POLY_LE in xz_private.h
This commit is contained in:
Greg Kroah-Hartman 2018-10-07 07:05:43 +02:00
commit cd2093cb45
5 changed files with 29 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
arch/powerpc/kernel/process.c
View File

@ -1306,6 +1306,16 @@ void show_user_instructions(struct pt_regs *regs)
pc = regs->nip - (instructions_to_print * 3 / 4 * sizeof(int));
/*
* Make sure the NIP points at userspace, not kernel text/data or
* elsewhere.
*/
if (!__access_ok(pc, instructions_to_print * sizeof(int), USER_DS)) {
pr_info("%s[%d]: Bad NIP, not dumping instructions.\n",
current->comm, current->pid);
return;
}
pr_info("%s[%d]: code: ", current->comm, current->pid);
for (i = 0; i < instructions_to_print; i++) {

20
arch/powerpc/lib/code-patching.c
View File

@ -28,12 +28,6 @@ static int __patch_instruction(unsigned int *exec_addr, unsigned int instr,
{
int err;
/* Make sure we aren't patching a freed init section */
if (init_mem_is_free && init_section_contains(exec_addr, 4)) {
pr_debug("Skipping init section patching addr: 0x%px\n", exec_addr);
return 0;
}
__put_user_size(instr, patch_addr, 4, err);
if (err)
return err;
@ -148,7 +142,7 @@ static inline int unmap_patch_area(unsigned long addr)
return 0;
}
int patch_instruction(unsigned int *addr, unsigned int instr)
static int do_patch_instruction(unsigned int *addr, unsigned int instr)
{
int err;
unsigned int *patch_addr = NULL;
@ -188,12 +182,22 @@ int patch_instruction(unsigned int *addr, unsigned int instr)
}
#else /* !CONFIG_STRICT_KERNEL_RWX */
int patch_instruction(unsigned int *addr, unsigned int instr)
static int do_patch_instruction(unsigned int *addr, unsigned int instr)
{
return raw_patch_instruction(addr, instr);
}
#endif /* CONFIG_STRICT_KERNEL_RWX */
int patch_instruction(unsigned int *addr, unsigned int instr)
{
/* Make sure we aren't patching a freed init section */
if (init_mem_is_free && init_section_contains(addr, 4)) {
pr_debug("Skipping init section patching addr: 0x%px\n", addr);
return 0;
}
return do_patch_instruction(addr, instr);
}
NOKPROBE_SYMBOL(patch_instruction);
int patch_branch(unsigned int *addr, unsigned long target, int flags)

5
arch/powerpc/mm/numa.c
View File

@ -1217,9 +1217,10 @@ int find_and_online_cpu_nid(int cpu)
* Need to ensure that NODE_DATA is initialized for a node from
* available memory (see memblock_alloc_try_nid). If unable to
* init the node, then default to nearest node that has memory
* installed.
* installed. Skip onlining a node if the subsystems are not
* yet initialized.
*/
if (try_online_node(new_nid))
if (!topology_inited || try_online_node(new_nid))
new_nid = first_online_node;
#else
/*

1
lib/xz/xz_crc32.c
View File

@ -15,7 +15,6 @@
* but they are bigger and use more memory for the lookup table.
*/
#include <linux/crc32poly.h>
#include "xz_private.h"
/*

4
lib/xz/xz_private.h
View File

@ -102,6 +102,10 @@
# endif
#endif
#ifndef CRC32_POLY_LE
#define CRC32_POLY_LE 0xedb88320
#endif
/*
* Allocate memory for LZMA2 decoder. xz_dec_lzma2_reset() must be used
* before calling xz_dec_lzma2_run().