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[vm] Add LC_ENCRYPTION_INFO(_64) load command to iOS snapshots.

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When uploading to the App Store, the program must contain an
LC_ENCRYPTION_INFO segment in the Mach-O header so the App Store
can appropriately modify it for its purposes without changing the
header size and/or offsets/addresses in the rest of the shared object.

By default, the load command is only added to iOS snapshots, but
it can be added to any Mach-O snapshot using the --macho-encryptable
command line option.

TEST=vm/dart/use_macho_options_test

Cq-Include-Trybots: luci.dart.try:vm-aot-mac-debug-x64-try,vm-aot-mac-debug-arm64-try,vm-aot-linux-debug-x64-try
Change-Id: I4e79fd9cfb9ba9d49707ec209eca3fee1cefc28c
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/475040
Reviewed-by: Alexander Markov <alexmarkov@google.com>
Commit-Queue: Tess Strickland <sstrickl@google.com>
This commit is contained in:
Tess Strickland
2026-01-26 06:34:51 -08:00
committed by Commit Queue
parent 87005f595c
commit 8cbf864289
4 changed files with 208 additions and 16 deletions
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runtime/platform/mach_o.h
+25
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@@ -140,6 +140,14 @@ static constexpr uint32_t LC_RPATH = (0x1c | LC_REQ_DYLD);
// The code signature which protects the preceding portion of the object file.
// Must be the last contents in the object file. (linkedit_data_command)
static constexpr uint32_t LC_CODE_SIGNATURE = 0x1d;
// Information about encrypted segments for 32-bit targets. Must also be present
// for programs with no encrypted segments that are uploaded to the App Store
// so it can be updated appropriately.
static constexpr uint32_t LC_ENCRYPTION_INFO = 0x21;
// Information about encrypted segments for 64-bit targets. Must also be present
// for programs with no encrypted segments that are uploaded to the App Store
// so it can be updated appropriately.
static constexpr uint32_t LC_ENCRYPTION_INFO_64 = 0x2c;
// An arbitrary piece of data not specified by the Mach-O format. (note_command)
static constexpr uint32_t LC_NOTE = 0x31;
// The target platform and minimum and target OS versions for this object file.
@@ -743,6 +751,23 @@ static constexpr uint32_t RELOC_TYPE_ARM64_UNSIGNED = 0 << 28;
// _before_ the target (UNSIGNED) entry that it is subtracted from.
static constexpr uint32_t RELOC_TYPE_ARM64_SUBTRACTOR = 1 << 28;
struct encryption_info_command {
uint32_t cmd; // LC_ENCRYPTION_INFO
uint32_t cmdsize;
uint32_t cryptoff; // file offset of the encrypted segment(s)
uint32_t cryptsize; // file size of the encrypted segment(s)
uint32_t cryptid; // encryption cypher used (0 == not encrypted)
};
struct encryption_info_command_64 {
uint32_t cmd; // LC_ENCRYPTION_INFO_64
uint32_t cmdsize;
uint32_t cryptoff; // file offset of the encrypted segment(s)
uint32_t cryptsize; // file size of the encrypted segment(s)
uint32_t cryptid; // encryption cypher used (0 == not encrypted)
uint32_t pad; // padding to a multiple of 64 bits
};
#pragma pack(pop)
} // namespace mach_o