https://github.com/google/kmsan
Revision 26474d73fd4b42891fb1801fcce5cba7e7942fcd authored by Alexander Potapenko on 04 July 2018, 11:38:51 UTC, committed by Alexander Potapenko on 28 August 2018, 11:10:10 UTC
For the repro below:
perf_event_open(&(0x7f0000000100)={0x2000000005, 0x70, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0xffff, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x3, @perf_bp={&(0x7f0000000000), 0x1}}, 0x0, 0x0, 0xffffffffffffffff, 0x0)
r0 = socket$inet_tcp(0x2, 0x1, 0x0)
setsockopt$SO_ATTACH_FILTER(r0, 0x1, 0x1a, &(0x7f0000000000)={0x1, &(0x7f0000000040)=[{}]}, 0x10)
the kernel used to crash while attempting to run on the stack belonging
to the cpu_entry_area.
There are no struct pages for cpu_entry_area, therefore we can't
allocate metadata pages for it. Instead we create two per-CPU arrays,
cpu_entry_area_shadow and cpu_entry_area_origin, which will serve as
shadow/origin storage for the stacks in the cpu_entry_area.
Also handle switches to the IST stacks by calling the kmsan_ist_enter()
and kmsan_ist_exit() hooks in entry_64.S.
Looks like this only happens for DEBUG_STACK at the moment.
1 parent 7eeb73f
Tip revision: 26474d73fd4b42891fb1801fcce5cba7e7942fcd authored by Alexander Potapenko on 04 July 2018, 11:38:51 UTC
kmsan: support cpu_entry_area
kmsan: support cpu_entry_area
Tip revision: 26474d7
| File | Mode | Size |
|---|---|---|
| Documentation | ||
| LICENSES | ||
| arch | ||
| block | ||
| certs | ||
| crypto | ||
| drivers | ||
| firmware | ||
| fs | ||
| include | ||
| init | ||
| ipc | ||
| kernel | ||
| lib | ||
| mm | ||
| net | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | -rw-r--r-- | 12.8 KB |
| .cocciconfig | -rw-r--r-- | 59 bytes |
| .config.example | -rw-r--r-- | 118.3 KB |
| .config.extended | -rw-r--r-- | 133.2 KB |
| .get_maintainer.ignore | -rw-r--r-- | 31 bytes |
| .gitattributes | -rw-r--r-- | 30 bytes |
| .gitignore | -rw-r--r-- | 1.5 KB |
| .mailmap | -rw-r--r-- | 9.7 KB |
| COPYING | -rw-r--r-- | 423 bytes |
| CREDITS | -rw-r--r-- | 96.4 KB |
| Kbuild | -rw-r--r-- | 2.2 KB |
| Kconfig | -rw-r--r-- | 563 bytes |
| MAINTAINERS | -rw-r--r-- | 458.4 KB |
| Makefile | -rw-r--r-- | 59.0 KB |
| README | -rw-r--r-- | 800 bytes |
| README.md | -rw-r--r-- | 2.1 KB |
| false-kmsan-cfq_init_cfqq.txt | -rw-r--r-- | 6.3 KB |
| kmsan-cfq_init_cfqq.txt | -rw-r--r-- | 6.0 KB |
| kmsan-clang.patch | -rw-r--r-- | 8.5 KB |
| kmsan-epoll_ctl.txt | -rw-r--r-- | 3.2 KB |
| kmsan-first-bug-writeup.txt | -rw-r--r-- | 8.1 KB |
| kmsan-llvm.patch | -rw-r--r-- | 38.7 KB |
| kmsan-packet_bind_spkt.txt | -rw-r--r-- | 4.4 KB |
| kmsan-radix_tree_insert.txt | -rw-r--r-- | 6.3 KB |
Computing file changes ...
