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Commit cd2093cb authored by Greg Kroah-Hartman's avatar Greg Kroah-Hartman
Browse files

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
parents c1d84a1b ac1788cc

arch/powerpc/kernel/process.c

+10 −0
Original line number Diff line number Diff line
@@ -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++) {

arch/powerpc/lib/code-patching.c

+12 −8
Original line number Diff line number Diff line
@@ -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)

arch/powerpc/mm/numa.c

+3 −2
Original line number Diff line number Diff line
@@ -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

		/*

lib/xz/xz_crc32.c

+0 −1
Original line number Diff line number Diff line
@@ -15,7 +15,6 @@ 
 * but they are bigger and use more memory for the lookup table.

 */



#include <linux/crc32poly.h>

#include "xz_private.h"



/*

lib/xz/xz_private.h

+4 −0
Original line number Diff line number Diff line
@@ -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().