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opensecura / 3p / sel4 / sel4_libs / 4fcd22fbb0e6d42ecc25652096984375f0a5b37a
commit4fcd22fbb0e6d42ecc25652096984375f0a5b37a[log] [tgz]
authorSimon Shields <simon.shields@data61.csiro.au>Tue Jun 18 13:32:16 2019 +1000
committerSimon Shields <simon.shields@data61.csiro.au>Tue Jun 25 09:54:01 2019 +1000
treecc7edecc2e525ef8f60376a8d109bb120ac170c3
parente4c54575a69da4eee4894e50e6b2b1fa1c96b479 [diff]
allocman: fix use of ALLOCMAN_NO_PADDR

Throughout allocman, various parts of the code for allocating a
specific paddr would check that the paddr fell within the bounds of a
given untyped node. Unfortunately, in some cases ALLOCMAN_NO_PADDR +
node->size would overlap with the paddr and cause a false positive -
allocman would *think* that a given node contains the request paddr,
when in fact it didn't.

Eventually, everything would fall apart: ALLOCMAN_NO_PADDR+node->size
would not be large enough to reach the paddr, and allocman would end
up with a NULL node where it wasn't expecting one.

Fix this issue by avoiding nodes with paddr == ALLOCMAN_NO_PADDR
whenever we're searching through node lists, thus preventing
such 'false positive' situations from occurring.
1 file changed
tree: cc7edecc2e525ef8f60376a8d109bb120ac170c3
  1. libsel4allocman/
  2. libsel4bench/
  3. libsel4debug/
  4. libsel4muslcsys/
  5. libsel4platsupport/
  6. libsel4serialserver/
  7. libsel4simple/
  8. libsel4simple-default/
  9. libsel4sync/
  10. libsel4test/
  11. libsel4utils/
  12. libsel4vka/
  13. libsel4vmm/
  14. libsel4vspace/
  15. .gitignore
  16. .licenseignore
  17. CMakeLists.txt
  18. LICENSE.txt
  19. README.md
README.md

seL4 Libraries

A collection of libraries for working on seL4.

  • libsel4allocman: an allocator for managing virtual memory, malloc memory and cspaces.
  • libsel4bench: a library with utilities for benchmarking on seL4.
  • libsel4debug: a library with utilities for debugging on seL4. Only useful when debugging a userlevel app; potentially hacky.
  • libsel4muslcsys: a library to support muslc for the root task.
  • libsel4platsupport: a wrapper around libplatsupport specificially for seL4.
  • libsel4simple: an interface which abstracts over the boot environment of a seL4 application.
  • libsel4simple-default: an implementation of simple for the master branch of the kernel.
  • libsel4simple-experimental: an implementatoin of simple for the experimental branch of the kernel.
  • libsel4sync: a synchronisation library that uses notifications to construct basic locks.
  • libsel4test: a very basic test infrastructure library.
  • libsel4utils: a library OS - Commonly used stuff, actively maintained: implements threads, processes, elf loading, virtual memory management etc.
  • libsel4vka: an allocation interface for seL4.
  • libsel4vspace: a virtual memory management interface for seL4.

License

The files in this repository are release under standard open source licenses. Please see individual file headers and the LICENSE_BSD2.txt file for details.