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Merge "Issue a prctl to let the kernel accept tagged pointers in syscall arguments."

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Peter Collingbourne 2019-11-20 03:15:55 +00:00 committed by Gerrit Code Review
commit 0e4af16ad5
1 changed files with 8 additions and 0 deletions
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8
libc/bionic/libc_init_common.cpp
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@ -103,6 +103,14 @@ void __libc_init_common() {
__system_properties_init(); // Requires 'environ'.
__libc_init_fdsan(); // Requires system properties (for debug.fdsan).
// Allow the kernel to accept tagged pointers in syscall arguments. This is a no-op (kernel
// returns -EINVAL) if the kernel doesn't understand the prctl.
#if defined(__aarch64__)
#define PR_SET_TAGGED_ADDR_CTRL 55
#define PR_TAGGED_ADDR_ENABLE (1UL << 0)
prctl(PR_SET_TAGGED_ADDR_CTRL, PR_TAGGED_ADDR_ENABLE, 0, 0, 0);
#endif
}
void __libc_init_fork_handler() {