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| author | Peter Collingbourne <pcc@google.com> | 2018-11-14 12:41:41 -0800 |
|---|---|---|
| committer | Peter Collingbourne <pcc@google.com> | 2018-11-16 14:37:08 -0800 |
| commit | 734beec3d48a7ea5cfe3bd0815676181ea698cc7 (patch) | |
| tree | 4a288b288b56d549c23e25166de6be1b86729c79 /tests/string_test.cpp | |
| parent | 83590680649dc04ce8a98cd85b6356e1d6066564 (diff) | |
Allocate a small guard region around the shadow call stack.
This lets us do two things:
1) Make setjmp and longjmp compatible with shadow call stack.
To avoid leaking the shadow call stack address into memory, only the
lower log2(SCS_SIZE) bits of x18 are stored to jmp_buf. This requires
allocating an additional guard page so that we're guaranteed to be
able to allocate a sufficiently aligned SCS.
2) SCS overflow detection. Overflows now result in a SIGSEGV instead
of corrupting the allocation that comes after it.
Change-Id: I04d6634f96162bf625684672a87fba8b402b7fd1
Test: bionic-unit-tests
Diffstat (limited to 'tests/string_test.cpp')
0 files changed, 0 insertions, 0 deletions