loader: Only extend segments if kernel supports page size migration
It has been found that some existing apps have implicit dependencies on
the address ranges in /proc/*/maps. Since segment extension changes the
range of the LOAD segment VMAs some of these apps crash, either by
SIGBUS or in yet unidentified ways.
Only perform the segment extension optimization if the kernel has the
necessary mitigations to ensure app compatibility.
Bug: 330117029
Bug: 327600007
Bug: 330767927
Bug: 328266487
Bug: 329803029
Test: Manual - Launch Free Fire Chaos app
Change-Id: I5b03b22c4a468f6646750a00942cc2d57f43d0de
Signed-off-by: Kalesh Singh <kaleshsingh@google.com>
diff --git a/linker/linker_phdr.h b/linker/linker_phdr.h
index 61242eb..aab9018 100644
--- a/linker/linker_phdr.h
+++ b/linker/linker_phdr.h
@@ -154,3 +154,5 @@
const char* phdr_table_get_interpreter_name(const ElfW(Phdr)* phdr_table, size_t phdr_count,
ElfW(Addr) load_bias);
+
+bool page_size_migration_supported();