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Commit 0666f560 authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge branch 'core-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 

Pull misc fixes from Thomas Gleixner:

  - A fix for a user space regression in /proc/$PID/stat

  - A couple of objtool fixes:
     ~ Plug a memory leak
     ~ Avoid accessing empty sections which upsets certain binutil
       versions
     ~ Prevent corrupting the obj file when section sizes did not change

* 'core-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  fs/proc: Report eip/esp in /prod/PID/stat for coredumping
  objtool: Fix object file corruption
  objtool: Do not retrieve data from empty sections
  objtool: Fix memory leak in elf_create_rela_section()
parents e77d3b0c fd7d5627

fs/proc/array.c

+9 −0
Original line number Diff line number Diff line
@@ -62,6 +62,7 @@ 
#include <linux/mman.h>

#include <linux/sched/mm.h>

#include <linux/sched/numa_balancing.h>

#include <linux/sched/task_stack.h>

#include <linux/sched/task.h>

#include <linux/sched/cputime.h>

#include <linux/proc_fs.h>
@@ -421,7 +422,15 @@ static int do_task_stat(struct seq_file *m, struct pid_namespace *ns, 
		 * esp and eip are intentionally zeroed out.  There is no

		 * non-racy way to read them without freezing the task.

		 * Programs that need reliable values can use ptrace(2).

		 *

		 * The only exception is if the task is core dumping because

		 * a program is not able to use ptrace(2) in that case. It is

		 * safe because the task has stopped executing permanently.

		 */

		if (permitted && (task->flags & PF_DUMPCORE)) {

			eip = KSTK_EIP(task);

			esp = KSTK_ESP(task);

		}

	}



	get_task_comm(tcomm, task);

tools/objtool/elf.c

+20 −13
Original line number Diff line number Diff line
@@ -175,19 +175,20 @@ static int read_sections(struct elf *elf) 
			return -1;

		}



		if (sec->sh.sh_size != 0) {

			sec->data = elf_getdata(s, NULL);

			if (!sec->data) {

				WARN_ELF("elf_getdata");

				return -1;

			}



			if (sec->data->d_off != 0 ||

			    sec->data->d_size != sec->sh.sh_size) {

			WARN("unexpected data attributes for %s", sec->name);

				WARN("unexpected data attributes for %s",

				     sec->name);

				return -1;

			}



		sec->len = sec->data->d_size;

		}

		sec->len = sec->sh.sh_size;

	}



	/* sanity check, one more call to elf_nextscn() should return NULL */
@@ -508,6 +509,7 @@ struct section *elf_create_rela_section(struct elf *elf, struct section *base) 
	strcat(relaname, base->name);



	sec = elf_create_section(elf, relaname, sizeof(GElf_Rela), 0);

	free(relaname);

	if (!sec)

		return NULL;
@@ -561,6 +563,7 @@ int elf_write(struct elf *elf) 
	struct section *sec;

	Elf_Scn *s;



	/* Update section headers for changed sections: */

	list_for_each_entry(sec, &elf->sections, list) {

		if (sec->changed) {

			s = elf_getscn(elf->elf, sec->idx);
@@ -575,6 +578,10 @@ int elf_write(struct elf *elf) 
		}

	}



	/* Make sure the new section header entries get updated properly. */

	elf_flagelf(elf->elf, ELF_C_SET, ELF_F_DIRTY);



	/* Write all changes to the file. */

	if (elf_update(elf->elf, ELF_C_WRITE) < 0) {

		WARN_ELF("elf_update");

		return -1;