diff options
Diffstat (limited to 'compiler-rt/lib/esan/esan_shadow.h')
| -rw-r--r-- | compiler-rt/lib/esan/esan_shadow.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/compiler-rt/lib/esan/esan_shadow.h b/compiler-rt/lib/esan/esan_shadow.h index 4507c3d14b5..f8f154ef7cc 100644 --- a/compiler-rt/lib/esan/esan_shadow.h +++ b/compiler-rt/lib/esan/esan_shadow.h @@ -40,6 +40,10 @@ namespace __esan { // library region to distinguish the vsyscall's shadow, considering this gap to // be an invalid app region. // We disallow application memory outside of those 5 regions. +// Our regions assume that the stack rlimit is less than a terabyte (otherwise +// the Linux kernel's default mmap region drops below 0x7e00'), which we enforce +// at init time (we can support larger and unlimited sizes for shadow +// scaledowns, but it is difficult for 1:1 mappings). // // Our shadow memory is scaled from a 1:1 mapping and supports a scale // specified at library initialization time that can be any power-of-2 @@ -103,6 +107,10 @@ static const struct ApplicationRegion AppRegions[] = { }; static const u32 NumAppRegions = sizeof(AppRegions)/sizeof(AppRegions[0]); +// See the comment above: we do not currently support a stack size rlimit +// equal to or larger than 1TB. +static const uptr MaxStackSize = (1ULL << 40) - 4096; + class ShadowMapping { public: static const uptr Mask = 0x00000fffffffffffu; |
