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crash: fix null pointer reference when CONFIG_KASAN is open

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If CONFIG_KASAN is open, CONFIG_VMAP_STACK will be closed. And
the sdei_stack_normal_ptr will be undefined. When crash init the
stack, sdei_stacks will not init. We should not access the sdei_stacks
later, so check null pointer before access it.

Signed-off-by: wangbin <wangbin224@huawei.com>
This commit is contained in:
wangbin 2021-09-03 16:14:17 +08:00
parent 0cec8d7d9d
commit 1882a00b9d
2 changed files with 7 additions and 2 deletions
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4
add-SDEI-stack-resolution.patch
View File

@ -225,7 +225,7 @@ index fdf77bd..cc32d9d 100644
bt->flags &= ~BT_IRQSTACK; bt->flags &= ~BT_IRQSTACK;
if (arm64_switch_stack(bt, &stackframe, ofp) == USER_MODE) if (arm64_switch_stack(bt, &stackframe, ofp) == USER_MODE)
break; break;
@@ -2965,6 +3068,79 @@ arm64_in_kdump_text(struct bt_info *bt, struct arm64_stackframe *frame) @@ -2965,6 +3068,81 @@ arm64_in_kdump_text(struct bt_info *bt, struct arm64_stackframe *frame)
} }
static int static int
@ -241,6 +241,8 @@ index fdf77bd..cc32d9d 100644
+ return FALSE; + return FALSE;
+ +
+ ms = machdep->machspec; + ms = machdep->machspec;
+ if (!ms->sdei_stacks)
+ return FALSE;
+ cpu = bt->tc->processor; + cpu = bt->tc->processor;
+ stackbase = ms->sdei_stacks[cpu]; + stackbase = ms->sdei_stacks[cpu];
+ stackbuf = GETBUF(ms->sdei_stack_size); + stackbuf = GETBUF(ms->sdei_stack_size);

5
crash.spec
View File

@ -1,6 +1,6 @@
Name: crash Name: crash
Version: 7.2.9 Version: 7.2.9
Release: 4 Release: 5
Summary: Linux kernel crash utility. Summary: Linux kernel crash utility.
License: GPLv3 License: GPLv3
URL: https://crash-utility.github.io URL: https://crash-utility.github.io
@ -76,6 +76,9 @@ install -D -m 0644 defs.h %{buildroot}%{_includedir}/%{name}/defs.h
%{_mandir}/man8/crash.8* %{_mandir}/man8/crash.8*
%changelog %changelog
* Fri Sep 03 2021 wangbin <wangbin224@huawei.com> - 7.2.9-5
- fix null pointer reference when CONFIG_KASAN is open
* Tue Jun 29 2021 zhouwenpei <zhouwenpei1@huawei.com> - 7.2.9-4 * Tue Jun 29 2021 zhouwenpei <zhouwenpei1@huawei.com> - 7.2.9-4
- add buildrequires m4 - add buildrequires m4