mirror of
https://github.com/Divested-Mobile/DivestOS-Build.git
synced 2024-09-21 16:56:08 +00:00
28d2113957
verified working on bullhead via: - top - /proc/self/maps with -DLABEL_MEMORY - Sanitizer Test App and logcat Signed-off-by: Tavi <tavi@divested.dev>
549 lines
16 KiB
Diff
549 lines
16 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Elliott Hughes <enh@google.com>
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Date: Wed, 27 Sep 2017 16:33:35 -0700
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Subject: [PATCH] Add <sys/random.h>.
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iOS 10 has <sys/random.h> with getentropy, glibc >= 2.25 has
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<sys/random.h> with getentropy and getrandom. (glibc also pollutes
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<unistd.h>, but that seems like a bad idea.)
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Also, all supported devices now have kernels with the getrandom system
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call.
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We've had these available internally for a while, but it seems like the
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time is ripe to expose them.
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Bug: http://b/67014255
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Test: ran tests
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Change-Id: I76dde1e3a2d0bc82777eea437ac193f96964f138
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---
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libc/SECCOMP_WHITELIST.TXT | 1 -
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libc/SYSCALLS.TXT | 3 +
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libc/arch-arm/syscalls/getrandom.S | 16 +++
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libc/arch-arm64/syscalls/getrandom.S | 14 ++
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libc/arch-mips/syscalls/getrandom.S | 19 +++
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libc/arch-mips64/syscalls/getrandom.S | 25 ++++
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libc/arch-x86/syscalls/getrandom.S | 39 ++++++
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libc/arch-x86_64/syscalls/getrandom.S | 15 +++
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libc/include/sys/random.h | 47 +++++++
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libc/libc.arm.map | 2 +
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libc/libc.arm64.map | 2 +
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libc/libc.map.txt | 2 +
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libc/libc.mips.map | 2 +
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libc/libc.mips64.map | 2 +
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libc/libc.x86.map | 2 +
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libc/libc.x86_64.map | 2 +
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.../android/include/openbsd-compat.h | 10 +-
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tests/Android.bp | 1 +
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tests/sys_random_test.cpp | 120 ++++++++++++++++++
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19 files changed, 319 insertions(+), 5 deletions(-)
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create mode 100644 libc/arch-arm/syscalls/getrandom.S
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create mode 100644 libc/arch-arm64/syscalls/getrandom.S
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create mode 100644 libc/arch-mips/syscalls/getrandom.S
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create mode 100644 libc/arch-mips64/syscalls/getrandom.S
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create mode 100644 libc/arch-x86/syscalls/getrandom.S
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create mode 100644 libc/arch-x86_64/syscalls/getrandom.S
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create mode 100644 libc/include/sys/random.h
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create mode 100644 tests/sys_random_test.cpp
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diff --git a/libc/SECCOMP_WHITELIST.TXT b/libc/SECCOMP_WHITELIST.TXT
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index 0b9dad3ff..f36b29032 100644
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--- a/libc/SECCOMP_WHITELIST.TXT
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+++ b/libc/SECCOMP_WHITELIST.TXT
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@@ -35,7 +35,6 @@ int clone:clone(int (*fn)(void *), void *child_stack, int flags, void *arg, ..)
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int rt_sigreturn:rt_sigreturn(unsigned long __unused) all
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int rt_tgsigqueueinfo:int rt_tgsigqueueinfo(pid_t tgid, pid_t tid, int sig, siginfo_t *uinfo) all
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int restart_syscall:int restart_syscall() all
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-int getrandom:int getrandom(void *buf, size_t buflen, unsigned int flags) all
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int fstatat64|fstatat:newfstatat(int, const char*, struct stat*, int) mips64
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int fstat64|fstat:fstat(int, struct stat*) mips64
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int _flush_cache:cacheflush(char* addr, const int nbytes, const int op) mips64
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diff --git a/libc/SYSCALLS.TXT b/libc/SYSCALLS.TXT
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index d674630ac..2070de7b5 100644
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--- a/libc/SYSCALLS.TXT
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+++ b/libc/SYSCALLS.TXT
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@@ -352,3 +352,6 @@ int __set_thread_area:set_thread_area(void*) x86
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# vdso stuff.
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int __clock_gettime:clock_gettime(clockid_t, timespec*) all
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int __gettimeofday:gettimeofday(timeval*, timezone*) all
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+
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+# <sys/random.h>
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+ssize_t getrandom(void*, size_t, unsigned) all
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diff --git a/libc/arch-arm/syscalls/getrandom.S b/libc/arch-arm/syscalls/getrandom.S
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new file mode 100644
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index 000000000..3f28af6f0
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--- /dev/null
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+++ b/libc/arch-arm/syscalls/getrandom.S
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@@ -0,0 +1,16 @@
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+/* Generated by gensyscalls.py. Do not edit. */
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+
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+#include <private/bionic_asm.h>
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+
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+ENTRY(getrandom)
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+ mov ip, r7
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+ .cfi_register r7, ip
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+ ldr r7, =__NR_getrandom
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+ swi #0
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+ mov r7, ip
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+ .cfi_restore r7
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+ cmn r0, #(MAX_ERRNO + 1)
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+ bxls lr
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+ neg r0, r0
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+ b __set_errno_internal
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+END(getrandom)
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diff --git a/libc/arch-arm64/syscalls/getrandom.S b/libc/arch-arm64/syscalls/getrandom.S
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new file mode 100644
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index 000000000..c8fe41ffd
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--- /dev/null
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+++ b/libc/arch-arm64/syscalls/getrandom.S
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@@ -0,0 +1,14 @@
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+/* Generated by gensyscalls.py. Do not edit. */
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+
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+#include <private/bionic_asm.h>
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+
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+ENTRY(getrandom)
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+ mov x8, __NR_getrandom
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+ svc #0
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+
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+ cmn x0, #(MAX_ERRNO + 1)
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+ cneg x0, x0, hi
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+ b.hi __set_errno_internal
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+
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+ ret
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+END(getrandom)
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diff --git a/libc/arch-mips/syscalls/getrandom.S b/libc/arch-mips/syscalls/getrandom.S
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new file mode 100644
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index 000000000..7a2f3b978
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--- /dev/null
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+++ b/libc/arch-mips/syscalls/getrandom.S
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@@ -0,0 +1,19 @@
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+/* Generated by gensyscalls.py. Do not edit. */
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+
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+#include <private/bionic_asm.h>
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+
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+ENTRY(getrandom)
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+ .set noreorder
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+ .cpload t9
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+ li v0, __NR_getrandom
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+ syscall
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+ bnez a3, 1f
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+ move a0, v0
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+ j ra
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+ nop
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+1:
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+ la t9,__set_errno_internal
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+ j t9
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+ nop
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+ .set reorder
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+END(getrandom)
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diff --git a/libc/arch-mips64/syscalls/getrandom.S b/libc/arch-mips64/syscalls/getrandom.S
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new file mode 100644
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index 000000000..3c5b4673f
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--- /dev/null
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+++ b/libc/arch-mips64/syscalls/getrandom.S
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@@ -0,0 +1,25 @@
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+/* Generated by gensyscalls.py. Do not edit. */
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+
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+#include <private/bionic_asm.h>
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+
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+ENTRY(getrandom)
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+ .set push
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+ .set noreorder
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+ li v0, __NR_getrandom
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+ syscall
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+ bnez a3, 1f
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+ move a0, v0
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+ j ra
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+ nop
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+1:
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+ move t0, ra
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+ bal 2f
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+ nop
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+2:
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+ .cpsetup ra, t1, 2b
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+ LA t9,__set_errno_internal
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+ .cpreturn
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+ j t9
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+ move ra, t0
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+ .set pop
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+END(getrandom)
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diff --git a/libc/arch-x86/syscalls/getrandom.S b/libc/arch-x86/syscalls/getrandom.S
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new file mode 100644
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index 000000000..2e8ebc955
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--- /dev/null
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+++ b/libc/arch-x86/syscalls/getrandom.S
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@@ -0,0 +1,39 @@
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+/* Generated by gensyscalls.py. Do not edit. */
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+
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+#include <private/bionic_asm.h>
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+
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+ENTRY(getrandom)
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+ pushl %ebx
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+ .cfi_def_cfa_offset 8
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+ .cfi_rel_offset ebx, 0
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+ pushl %ecx
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+ .cfi_adjust_cfa_offset 4
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+ .cfi_rel_offset ecx, 0
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+ pushl %edx
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+ .cfi_adjust_cfa_offset 4
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+ .cfi_rel_offset edx, 0
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+
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+ call __kernel_syscall
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+ pushl %eax
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+ .cfi_adjust_cfa_offset 4
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+ .cfi_rel_offset eax, 0
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+
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+ mov 20(%esp), %ebx
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+ mov 24(%esp), %ecx
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+ mov 28(%esp), %edx
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+ movl $__NR_getrandom, %eax
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+ call *(%esp)
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+ addl $4, %esp
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+
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+ cmpl $-MAX_ERRNO, %eax
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+ jb 1f
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+ negl %eax
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+ pushl %eax
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+ call __set_errno_internal
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+ addl $4, %esp
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+1:
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+ popl %edx
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+ popl %ecx
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+ popl %ebx
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+ ret
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+END(getrandom)
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diff --git a/libc/arch-x86_64/syscalls/getrandom.S b/libc/arch-x86_64/syscalls/getrandom.S
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new file mode 100644
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index 000000000..c5e44a966
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--- /dev/null
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+++ b/libc/arch-x86_64/syscalls/getrandom.S
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@@ -0,0 +1,15 @@
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+/* Generated by gensyscalls.py. Do not edit. */
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+
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+#include <private/bionic_asm.h>
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+
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+ENTRY(getrandom)
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+ movl $__NR_getrandom, %eax
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+ syscall
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+ cmpq $-MAX_ERRNO, %rax
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+ jb 1f
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+ negl %eax
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+ movl %eax, %edi
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+ call __set_errno_internal
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+1:
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+ ret
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+END(getrandom)
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diff --git a/libc/include/sys/random.h b/libc/include/sys/random.h
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new file mode 100644
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index 000000000..34756520e
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--- /dev/null
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+++ b/libc/include/sys/random.h
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@@ -0,0 +1,47 @@
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+/*
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+ * Copyright (C) 2017 The Android Open Source Project
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+ * All rights reserved.
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+ *
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+ * Redistribution and use in source and binary forms, with or without
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+ * modification, are permitted provided that the following conditions
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+ * are met:
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+ * * Redistributions of source code must retain the above copyright
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+ * notice, this list of conditions and the following disclaimer.
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+ * * Redistributions in binary form must reproduce the above copyright
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+ * notice, this list of conditions and the following disclaimer in
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+ * the documentation and/or other materials provided with the
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+ * distribution.
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+ *
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+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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+ * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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+ * SUCH DAMAGE.
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+ */
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+
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+#ifndef _SYS_RANDOM_H_
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+#define _SYS_RANDOM_H_
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+
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+#include <sys/cdefs.h>
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+#include <sys/types.h>
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+
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+#include <linux/random.h>
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+
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+__BEGIN_DECLS
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+
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+/* See also arc4random_buf in <stdlib.h>, which is available in all API levels. */
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+
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+int getentropy(void* __buffer, size_t __buffer_size) __wur __INTRODUCED_IN_FUTURE;
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+
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+ssize_t getrandom(void* __buffer, size_t __buffer_size, unsigned int __flags) __wur __INTRODUCED_IN_FUTURE;
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+
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+__END_DECLS
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+
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+#endif
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diff --git a/libc/libc.arm.map b/libc/libc.arm.map
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index a4212dda7..aa66b4d61 100644
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--- a/libc/libc.arm.map
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+++ b/libc/libc.arm.map
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@@ -1532,6 +1532,8 @@ LIBC_PRIVATE {
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vfdprintf; # arm x86 mips
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wait3; # arm x86 mips
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wcswcs; # arm x86 mips
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+ getentropy; # future
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+ getrandom; # future
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} LIBC_O;
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LIBC_DEPRECATED {
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diff --git a/libc/libc.arm64.map b/libc/libc.arm64.map
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index bf0341ad2..6a34fb533 100644
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--- a/libc/libc.arm64.map
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+++ b/libc/libc.arm64.map
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@@ -1249,6 +1249,8 @@ LIBC_PRIVATE {
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free_malloc_leak_info;
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get_malloc_leak_info;
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gMallocLeakZygoteChild;
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+ getentropy; # future
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+ getrandom; # future
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} LIBC_O;
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LIBC_DEPRECATED {
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diff --git a/libc/libc.map.txt b/libc/libc.map.txt
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index c271a57e4..d740fe764 100644
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--- a/libc/libc.map.txt
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+++ b/libc/libc.map.txt
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@@ -1558,6 +1558,8 @@ LIBC_PRIVATE {
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vfdprintf; # arm x86 mips
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wait3; # arm x86 mips
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wcswcs; # arm x86 mips
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+ getentropy; # future
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+ getrandom; # future
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} LIBC_O;
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LIBC_DEPRECATED {
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diff --git a/libc/libc.mips.map b/libc/libc.mips.map
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index 214c7f506..385606c64 100644
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--- a/libc/libc.mips.map
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+++ b/libc/libc.mips.map
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@@ -1373,6 +1373,8 @@ LIBC_PRIVATE {
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vfdprintf; # arm x86 mips
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wait3; # arm x86 mips
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wcswcs; # arm x86 mips
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+ getentropy; # future
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+ getrandom; # future
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} LIBC_O;
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LIBC_DEPRECATED {
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diff --git a/libc/libc.mips64.map b/libc/libc.mips64.map
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index bf0341ad2..6a34fb533 100644
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--- a/libc/libc.mips64.map
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+++ b/libc/libc.mips64.map
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@@ -1249,6 +1249,8 @@ LIBC_PRIVATE {
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free_malloc_leak_info;
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get_malloc_leak_info;
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gMallocLeakZygoteChild;
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+ getentropy; # future
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+ getrandom; # future
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} LIBC_O;
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LIBC_DEPRECATED {
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diff --git a/libc/libc.x86.map b/libc/libc.x86.map
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index 145b64ebf..2b29d3e51 100644
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--- a/libc/libc.x86.map
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+++ b/libc/libc.x86.map
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@@ -1372,6 +1372,8 @@ LIBC_PRIVATE {
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vfdprintf; # arm x86 mips
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wait3; # arm x86 mips
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wcswcs; # arm x86 mips
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+ getentropy; # future
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+ getrandom; # future
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} LIBC_O;
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LIBC_DEPRECATED {
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diff --git a/libc/libc.x86_64.map b/libc/libc.x86_64.map
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index bf0341ad2..6a34fb533 100644
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--- a/libc/libc.x86_64.map
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+++ b/libc/libc.x86_64.map
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@@ -1249,6 +1249,8 @@ LIBC_PRIVATE {
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free_malloc_leak_info;
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get_malloc_leak_info;
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gMallocLeakZygoteChild;
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+ getentropy; # future
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+ getrandom; # future
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} LIBC_O;
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LIBC_DEPRECATED {
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diff --git a/libc/upstream-openbsd/android/include/openbsd-compat.h b/libc/upstream-openbsd/android/include/openbsd-compat.h
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index 1e433beef..dbc2db44c 100644
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--- a/libc/upstream-openbsd/android/include/openbsd-compat.h
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+++ b/libc/upstream-openbsd/android/include/openbsd-compat.h
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@@ -18,10 +18,15 @@
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#define _BIONIC_OPENBSD_COMPAT_H_included
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#define _BSD_SOURCE
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-
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#include <sys/cdefs.h>
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+
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#include <stddef.h> // For size_t.
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+// TODO: libandroid_support uses this file, so we need to wait for
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+// <sys/random.h> to be in the NDK headers before we can lose this declaration.
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+//#include <sys/random.h> // For getentropy.
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+int getentropy(void*, size_t);
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+
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#define __BEGIN_HIDDEN_DECLS _Pragma("GCC visibility push(hidden)")
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#define __END_HIDDEN_DECLS _Pragma("GCC visibility pop")
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@@ -74,9 +79,6 @@ extern const char* __progname;
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__LIBC_HIDDEN__ extern const char* __bionic_get_shell_path();
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#define _PATH_BSHELL __bionic_get_shell_path()
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-/* We have OpenBSD's getentropy_linux.c, but we don't mention getentropy in any header. */
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-__LIBC_HIDDEN__ extern int getentropy(void*, size_t);
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-
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/* OpenBSD has this as API, but we just use it internally. */
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__LIBC_HIDDEN__ void* reallocarray(void*, size_t, size_t);
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diff --git a/tests/Android.bp b/tests/Android.bp
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index 29204b558..b120ac3cc 100644
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--- a/tests/Android.bp
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+++ b/tests/Android.bp
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@@ -121,6 +121,7 @@ cc_test_library {
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"sys_procfs_test.cpp",
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"sys_ptrace_test.cpp",
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"sys_quota_test.cpp",
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+ "sys_random_test.cpp",
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"sys_resource_test.cpp",
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"sys_select_test.cpp",
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"sys_sem_test.cpp",
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diff --git a/tests/sys_random_test.cpp b/tests/sys_random_test.cpp
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new file mode 100644
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index 000000000..a25490c67
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--- /dev/null
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+++ b/tests/sys_random_test.cpp
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@@ -0,0 +1,120 @@
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+/*
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+ * Copyright (C) 2017 The Android Open Source Project
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+ *
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+ * Licensed under the Apache License, Version 2.0 (the "License");
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+ * you may not use this file except in compliance with the License.
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+ * You may obtain a copy of the License at
|
|
+ *
|
|
+ * http://www.apache.org/licenses/LICENSE-2.0
|
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+ *
|
|
+ * Unless required by applicable law or agreed to in writing, software
|
|
+ * distributed under the License is distributed on an "AS IS" BASIS,
|
|
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
+ * See the License for the specific language governing permissions and
|
|
+ * limitations under the License.
|
|
+ */
|
|
+
|
|
+// <sys/random.h> was only added as of glibc version 2.25.
|
|
+// Don't try to compile this code on older glibc versions.
|
|
+
|
|
+#include <sys/cdefs.h>
|
|
+#if defined(__BIONIC__)
|
|
+ #define HAVE_SYS_RANDOM 1
|
|
+#elif defined(__GLIBC_PREREQ)
|
|
+ #if __GLIBC_PREREQ(2, 25)
|
|
+ #define HAVE_SYS_RANDOM 1
|
|
+ #endif
|
|
+#endif
|
|
+
|
|
+
|
|
+#if defined(HAVE_SYS_RANDOM)
|
|
+#include <sys/random.h>
|
|
+#endif
|
|
+
|
|
+#include <errno.h>
|
|
+#include <gtest/gtest.h>
|
|
+
|
|
+TEST(sys_random, getentropy) {
|
|
+#if defined(HAVE_SYS_RANDOM)
|
|
+ char buf1[64];
|
|
+ char buf2[64];
|
|
+
|
|
+ ASSERT_EQ(0, getentropy(buf1, sizeof(buf1)));
|
|
+ ASSERT_EQ(0, getentropy(buf2, sizeof(buf2)));
|
|
+ ASSERT_TRUE(memcmp(buf1, buf2, sizeof(buf1)) != 0);
|
|
+#else
|
|
+ GTEST_LOG_(INFO) << "This test requires a C library with <sys/random.h>.\n";
|
|
+#endif
|
|
+}
|
|
+
|
|
+TEST(sys_random, getentropy_EFAULT) {
|
|
+#if defined(HAVE_SYS_RANDOM)
|
|
+ errno = 0;
|
|
+ ASSERT_EQ(-1, getentropy(nullptr, 1));
|
|
+ ASSERT_EQ(EFAULT, errno);
|
|
+#else
|
|
+ GTEST_LOG_(INFO) << "This test requires a C library with <sys/random.h>.\n";
|
|
+#endif
|
|
+}
|
|
+
|
|
+TEST(sys_random, getentropy_EIO) {
|
|
+#if defined(HAVE_SYS_RANDOM)
|
|
+ char buf[BUFSIZ];
|
|
+ static_assert(BUFSIZ > 256, "BUFSIZ <= 256!");
|
|
+
|
|
+ errno = 0;
|
|
+ ASSERT_EQ(-1, getentropy(buf, sizeof(buf)));
|
|
+ ASSERT_EQ(EIO, errno);
|
|
+#else
|
|
+ GTEST_LOG_(INFO) << "This test requires a C library with <sys/random.h>.\n";
|
|
+#endif
|
|
+}
|
|
+
|
|
+TEST(sys_random, getrandom) {
|
|
+#if defined(HAVE_SYS_RANDOM)
|
|
+ if (getrandom(nullptr, 0, 0) == -1 && errno == ENOSYS) {
|
|
+ GTEST_LOG_(INFO) << "This test requires a >= 3.17 kernel with getrandom(2).\n";
|
|
+ return;
|
|
+ }
|
|
+
|
|
+ char buf1[64];
|
|
+ char buf2[64];
|
|
+
|
|
+ ASSERT_EQ(64, getrandom(buf1, sizeof(buf1), 0));
|
|
+ ASSERT_EQ(64, getrandom(buf2, sizeof(buf2), 0));
|
|
+ ASSERT_TRUE(memcmp(buf1, buf2, sizeof(buf1)) != 0);
|
|
+#else
|
|
+ GTEST_LOG_(INFO) << "This test requires a C library with <sys/random.h>.\n";
|
|
+#endif
|
|
+}
|
|
+
|
|
+TEST(sys_random, getrandom_EFAULT) {
|
|
+#if defined(HAVE_SYS_RANDOM)
|
|
+ if (getrandom(nullptr, 0, 0) == -1 && errno == ENOSYS) {
|
|
+ GTEST_LOG_(INFO) << "This test requires a >= 3.17 kernel with getrandom(2).\n";
|
|
+ return;
|
|
+ }
|
|
+
|
|
+ errno = 0;
|
|
+ ASSERT_EQ(-1, getrandom(nullptr, 256, 0));
|
|
+ ASSERT_EQ(EFAULT, errno);
|
|
+#else
|
|
+ GTEST_LOG_(INFO) << "This test requires a C library with <sys/random.h>.\n";
|
|
+#endif
|
|
+}
|
|
+
|
|
+TEST(sys_random, getrandom_EINVAL) {
|
|
+#if defined(HAVE_SYS_RANDOM)
|
|
+ if (getrandom(nullptr, 0, 0) == -1 && errno == ENOSYS) {
|
|
+ GTEST_LOG_(INFO) << "This test requires a >= 3.17 kernel with getrandom(2).\n";
|
|
+ return;
|
|
+ }
|
|
+
|
|
+ errno = 0;
|
|
+ char buf[64];
|
|
+ ASSERT_EQ(-1, getrandom(buf, sizeof(buf), ~0));
|
|
+ ASSERT_EQ(EINVAL, errno);
|
|
+#else
|
|
+ GTEST_LOG_(INFO) << "This test requires a C library with <sys/random.h>.\n";
|
|
+#endif
|
|
+}
|