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| author | Thomas Weißschuh <thomas.weissschuh@linutronix.de> | 2024-10-21 22:11:19 +0800 |
|---|---|---|
| committer | Huacai Chen <chenhuacai@loongson.cn> | 2024-10-21 22:11:19 +0800 |
| commit | 134475a9ab8487527238d270639a8cb74c10aab2 (patch) | |
| tree | 15f40b044bcd600d8ea6dbce51cfd06e779bf445 /scripts/gdb/linux/stackdepot.py | |
| parent | 2ed119aef60d73d00371195fc84dd68248071100 (diff) | |
LoongArch: Don't crash in stack_top() for tasks without vDSO
Not all tasks have a vDSO mapped, for example kthreads never do. If such
a task ever ends up calling stack_top(), it will derefence the NULL vdso
pointer and crash.
This can for example happen when using kunit:
[<9000000000203874>] stack_top+0x58/0xa8
[<90000000002956cc>] arch_pick_mmap_layout+0x164/0x220
[<90000000003c284c>] kunit_vm_mmap_init+0x108/0x12c
[<90000000003c1fbc>] __kunit_add_resource+0x38/0x8c
[<90000000003c2704>] kunit_vm_mmap+0x88/0xc8
[<9000000000410b14>] usercopy_test_init+0xbc/0x25c
[<90000000003c1db4>] kunit_try_run_case+0x5c/0x184
[<90000000003c3d54>] kunit_generic_run_threadfn_adapter+0x24/0x48
[<900000000022e4bc>] kthread+0xc8/0xd4
[<9000000000200ce8>] ret_from_kernel_thread+0xc/0xa4
Fixes: 803b0fc5c3f2 ("LoongArch: Add process management")
Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
Diffstat (limited to 'scripts/gdb/linux/stackdepot.py')
0 files changed, 0 insertions, 0 deletions