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Export maximum number of fds/ints in a native_handle.

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So we can deserialize it consisently and safely.

Bug: 120084106
Test: builds
Change-Id: I0eafff70d3a7e4d732fe600a0052efb90108208d
This commit is contained in:
Martijn Coenen 2018-12-05 09:42:25 +01:00
parent 9ce034ce8a
commit 02debfa2df
2 changed files with 5 additions and 4 deletions
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3
libcutils/include/cutils/native_handle.h
View file

@ -23,6 +23,9 @@
extern "C" {
#endif
#define NATIVE_HANDLE_MAX_FDS 1024
#define NATIVE_HANDLE_MAX_INTS 1024
/* Declare a char array for use with native_handle_init */
#define NATIVE_HANDLE_DECLARE_STORAGE(name, maxFds, maxInts) \
alignas(native_handle_t) char name[ \

6
libcutils/native_handle.c
View file

@ -22,9 +22,6 @@
#include <string.h>
#include <unistd.h>
static const int kMaxNativeFds = 1024;
static const int kMaxNativeInts = 1024;
native_handle_t* native_handle_init(char* storage, int numFds, int numInts) {
if ((uintptr_t) storage % alignof(native_handle_t)) {
errno = EINVAL;
@ -39,7 +36,8 @@ native_handle_t* native_handle_init(char* storage, int numFds, int numInts) {
}
native_handle_t* native_handle_create(int numFds, int numInts) {
if (numFds < 0 || numInts < 0 || numFds > kMaxNativeFds || numInts > kMaxNativeInts) {
if (numFds < 0 || numInts < 0 || numFds > NATIVE_HANDLE_MAX_FDS ||
numInts > NATIVE_HANDLE_MAX_INTS) {
errno = EINVAL;
return NULL;
}