[cfi] Export __cfi_shadow_size.
__cfi_shadow_size returns the size of the CFI shadow mapping, or 0 if
CFI is not (yet) used in this process. This can be used to adjust
RLIMIT_AS setting.
Test: device bionic tests
Bug: 64293803
Change-Id: Icd7164f96aa7115b3585c21c0f68529cd2f07c11
diff --git a/libdl/libdl.arm.map b/libdl/libdl.arm.map
index 292bd97..9fc9d23 100644
--- a/libdl/libdl.arm.map
+++ b/libdl/libdl.arm.map
@@ -36,6 +36,7 @@
LIBC_OMR1 { # future
global:
+ __cfi_shadow_size; # future
__cfi_slowpath; # future
__cfi_slowpath_diag; # future
} LIBC_N;
diff --git a/libdl/libdl.arm64.map b/libdl/libdl.arm64.map
index 2fe2c7b..bde6cab 100644
--- a/libdl/libdl.arm64.map
+++ b/libdl/libdl.arm64.map
@@ -35,6 +35,7 @@
LIBC_OMR1 { # future
global:
+ __cfi_shadow_size; # future
__cfi_slowpath; # future
__cfi_slowpath_diag; # future
} LIBC_N;
diff --git a/libdl/libdl.map.txt b/libdl/libdl.map.txt
index 408d4dc..d1f4ab8 100644
--- a/libdl/libdl.map.txt
+++ b/libdl/libdl.map.txt
@@ -35,6 +35,7 @@
LIBC_OMR1 { # future
global:
+ __cfi_shadow_size; # future
__cfi_slowpath; # future
__cfi_slowpath_diag; # future
} LIBC_N;
diff --git a/libdl/libdl.mips.map b/libdl/libdl.mips.map
index 2fe2c7b..bde6cab 100644
--- a/libdl/libdl.mips.map
+++ b/libdl/libdl.mips.map
@@ -35,6 +35,7 @@
LIBC_OMR1 { # future
global:
+ __cfi_shadow_size; # future
__cfi_slowpath; # future
__cfi_slowpath_diag; # future
} LIBC_N;
diff --git a/libdl/libdl.mips64.map b/libdl/libdl.mips64.map
index 2fe2c7b..bde6cab 100644
--- a/libdl/libdl.mips64.map
+++ b/libdl/libdl.mips64.map
@@ -35,6 +35,7 @@
LIBC_OMR1 { # future
global:
+ __cfi_shadow_size; # future
__cfi_slowpath; # future
__cfi_slowpath_diag; # future
} LIBC_N;
diff --git a/libdl/libdl.x86.map b/libdl/libdl.x86.map
index 2fe2c7b..bde6cab 100644
--- a/libdl/libdl.x86.map
+++ b/libdl/libdl.x86.map
@@ -35,6 +35,7 @@
LIBC_OMR1 { # future
global:
+ __cfi_shadow_size; # future
__cfi_slowpath; # future
__cfi_slowpath_diag; # future
} LIBC_N;
diff --git a/libdl/libdl.x86_64.map b/libdl/libdl.x86_64.map
index 2fe2c7b..bde6cab 100644
--- a/libdl/libdl.x86_64.map
+++ b/libdl/libdl.x86_64.map
@@ -35,6 +35,7 @@
LIBC_OMR1 { # future
global:
+ __cfi_shadow_size; # future
__cfi_slowpath; # future
__cfi_slowpath_diag; # future
} LIBC_N;
diff --git a/libdl/libdl_cfi.cpp b/libdl/libdl_cfi.cpp
index 8458564..483364f 100644
--- a/libdl/libdl_cfi.cpp
+++ b/libdl/libdl_cfi.cpp
@@ -38,6 +38,11 @@
return &shadow_base_storage.v;
}
+// Returns the size of the CFI shadow mapping, or 0 if CFI is not (yet) used in this process.
+extern "C" size_t __cfi_shadow_size() {
+ return shadow_base_storage.v != 0 ? CFIShadow::kShadowSize : 0;
+}
+
static uint16_t shadow_load(void* p) {
uintptr_t addr = reinterpret_cast<uintptr_t>(p);
uintptr_t ofs = CFIShadow::MemToShadowOffset(addr);