File 0006-Fix-for-failing-to-load-kernel-module.patch of Package crash

Overview Repositories Revisions Requests Users Attributes Meta

File 0006-Fix-for-failing-to-load-kernel-module.patch of Package crash (Revision 88d9f79869a67081f01743af2ae7f546)

Currently displaying revision 88d9f79869a67081f01743af2ae7f546 , Show latest

From: Lianbo Jiang <lijiang@redhat.com>
Date: Wed, 5 Jun 2024 17:30:33 +0800
Subject: Fix for failing to load kernel module
Git-repo: https://github.com/crash-utility/crash.git
Git-commit: a20eb05de3c1cab954d49eb8bb9dc7fe5224caa0
Patch-mainline: 8.0.6
References: bsc#1228388

In some kernel modules such as libie.ko, the mem[MOD_TEXT].size
may be zero, currently crash will only check its value to determine
if the module is valid, otherwise it fails to load kernel module with
the following warning and error:

WARNING: invalid kernel module size: 0
        KERNEL: /lib/modules/6.10.0-rc1+/build/vmlinux
      DUMPFILE: /proc/kcore
          CPUS: 64
          DATE: Wed Jun  5 12:49:02 IDT 2024
        UPTIME: 5 days, 05:57:21
  LOAD AVERAGE: 0.28, 0.06, 0.02
         TASKS: 806
      NODENAME: xxxx
       RELEASE: 6.10.0-rc1+
       VERSION: #1 SMP PREEMPT_DYNAMIC Fri May 31 04:56:59 IDT 2024
       MACHINE: x86_64  (2100 Mhz)
        MEMORY: 1.6 GB
           PID: 203686
       COMMAND: "crash"
          TASK: ffff9f9bf66d0000  [THREAD_INFO: ffff9f9bf66d0000]
           CPU: 52
         STATE: TASK_RUNNING (ACTIVE)

crash> mod
  mod: cannot access vmalloc'd module memory
  crash>

Lets count the module size to check if the module is valid, that will
avoid the current failure.

Signed-off-by: Lianbo Jiang <lijiang@redhat.com>
Signed-off-by: Jiri Slaby (SUSE) <jirislaby@kernel.org>
---
 kernel.c | 20 ++++++++++++++++----
 1 file changed, 16 insertions(+), 4 deletions(-)

diff --git a/kernel.c b/kernel.c
index cd3d6044cc9a..8a9d498760bc 100644
--- a/kernel.c
+++ b/kernel.c
@@ -3822,9 +3822,21 @@ module_init(void)
 		case KALLSYMS_V2:
 			if (THIS_KERNEL_VERSION >= LINUX(2,6,27)) {
 				numksyms = UINT(modbuf + OFFSET(module_num_symtab));
-				if (MODULE_MEMORY())
-					/* check mem[MOD_TEXT].size only */
-					size = UINT(modbuf + OFFSET(module_mem) + OFFSET(module_memory_size));
+				if (MODULE_MEMORY()) {
+					/*
+					 * The mem[MOD_TEXT].size may be zero, lets count
+					 * the module size as below.
+					*/
+					int t;
+					size = 0;
+					for_each_mod_mem_type(t) {
+						if (t == MOD_INIT_TEXT)
+							break;
+						size += UINT(modbuf + OFFSET(module_mem) +
+								SIZE(module_memory) * t +
+								OFFSET(module_memory_size));
+					}
+				}
 				else
 					size = UINT(modbuf + MODULE_OFFSET2(module_core_size, rx));
 			} else {
@@ -3927,7 +3939,7 @@ verify_modules(void)
 
                 for (i = 0, found = FALSE; i < kt->mods_installed; i++) {
                         lm = &st->load_modules[i];
-			if (!kvtop(NULL, lm->mod_base, &paddr, 0)) {
+			if (lm->mod_base && !kvtop(NULL, lm->mod_base, &paddr, 0)) {
 				irregularities++;
                                 break;
 			}
-- 
2.45.2

Places

File 0006-Fix-for-failing-to-load-kernel-module.patch of Package crash (Revision 88d9f79869a67081f01743af2ae7f546)

Places