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Allow sharing the RELRO section via a file.

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Add flags and a file descriptor to android_dlopen_ext() to allow writing
the RELRO section of the loaded library to a file after relocation
processing, and to allow mapping identical pages from the file over the
top of relocated memory in another process. Explicitly comparing the
pages is required in case a page contains a reference to a symbol
defined in another library loaded at a random base address.

Bug: 13005501
Change-Id: Ibb5b2d384edfaa5acf3e97a5f8b6115c10497a1e
This commit is contained in:
Torne (Richard Coles)
2014-02-27 13:18:00 +00:00
parent 12bbb91645
commit 183ad9df53
5 changed files with 226 additions and 6 deletions
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5
linker/linker_phdr.h
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@@ -89,6 +89,11 @@ int phdr_table_unprotect_segments(const ElfW(Phdr)* phdr_table, size_t phdr_coun
int phdr_table_protect_gnu_relro(const ElfW(Phdr)* phdr_table, size_t phdr_count, ElfW(Addr) load_bias);
int phdr_table_serialize_gnu_relro(const ElfW(Phdr)* phdr_table, size_t phdr_count, ElfW(Addr) load_bias,
int fd);
int phdr_table_map_gnu_relro(const ElfW(Phdr)* phdr_table, size_t phdr_count, ElfW(Addr) load_bias,
int fd);
#if defined(__arm__)
int phdr_table_get_arm_exidx(const ElfW(Phdr)* phdr_table, size_t phdr_count, ElfW(Addr) load_bias,