gpkg/glibc: implementation of fakesyscall (#240)

termux-pacman · May 6, 2024 · 5f6b1f5 · 5f6b1f5
1 parent 544ab0e
commit 5f6b1f5
Show file tree

Hide file tree

Showing 10 changed files with 100 additions and 608 deletions.
diff --git a/gpkg/glibc/aarch64-arch-syscall.h.patch b/gpkg/glibc/aarch64-arch-syscall.h.patch
diff --git a/gpkg/glibc/arm-arch-syscall.h.patch b/gpkg/glibc/arm-arch-syscall.h.patch
diff --git a/gpkg/glibc/build.sh b/gpkg/glibc/build.sh
@@ -3,7 +3,7 @@ TERMUX_PKG_DESCRIPTION="GNU C Library"
 TERMUX_PKG_LICENSE="GPL-3.0, LGPL-3.0"
 TERMUX_PKG_MAINTAINER="@termux-pacman"
 TERMUX_PKG_VERSION=2.39
-TERMUX_PKG_REVISION=3
+TERMUX_PKG_REVISION=4
 TERMUX_PKG_SRCURL=https://ftp.gnu.org/gnu/libc/glibc-$TERMUX_PKG_VERSION.tar.xz
 TERMUX_PKG_SHA256=f77bd47cf8170c57365ae7bf86696c118adb3b120d3259c64c502d3dc1e2d926
 TERMUX_PKG_DEPENDS="linux-api-headers-glibc"
@@ -16,7 +16,7 @@ termux_step_pre_configure() {
 		termux_error_exit "Compilation is only possible based on glibc"
 	fi
 
-	for i in shmem-android.h shmat.c  shmctl.c  shmdt.c  shmget.c mprotect.c ignore-syscall.h; do
+	for i in shmem-android.h shmat.c  shmctl.c  shmdt.c  shmget.c mprotect.c syscall.c fake-syscall.h; do
 		install -Dm644 "${TERMUX_PKG_BUILDER_DIR}/${i}" "${TERMUX_PKG_SRCDIR}/sysdeps/unix/sysv/linux/${i}"
 	done
 
@@ -37,6 +37,16 @@ termux_step_pre_configure() {
 	bash ${TERMUX_PKG_BUILDER_DIR}/gen-android-ids.sh ${TERMUX_BASE_DIR} \
 		${TERMUX_PKG_SRCDIR}/nss/android_ids.h \
 		${TERMUX_PKG_BUILDER_DIR}/android_system_user_ids.h
+
+	# `disabled-syscalls` - a file that contains a list of system calls that should be disabled
+	for i in aarch64 arm i386 x86_64/64; do
+		{
+			for j in $(awk '{printf "__NR_" $1 " "}' ${TERMUX_PKG_BUILDER_DIR}/disabled-syscalls); do
+				grep "#define ${j} " ${TERMUX_PKG_SRCDIR}/sysdeps/unix/sysv/linux/${i}/arch-syscall.h || true
+				sed -i "/#define ${j} /d" ${TERMUX_PKG_SRCDIR}/sysdeps/unix/sysv/linux/${i}/arch-syscall.h
+			done
+		} >> ${TERMUX_PKG_SRCDIR}/sysdeps/unix/sysv/linux/${i}/disabled-syscall.h
+	done
 }
 
 termux_step_configure() {

diff --git a/gpkg/glibc/disabled-syscalls b/gpkg/glibc/disabled-syscalls
@@ -0,0 +1,31 @@
+accept
+chmod
+chown
+chown32
+clock_gettime64
+clone3
+close_range
+epoll_pwait2
+faccessat2
+fchmodat2
+futex_waitv
+getpgrp
+landlock_create_ruleset
+pidfd_send_signal
+recv
+rmdir
+rseq
+send
+set_robust_list
+setfsgid
+setfsgid32
+setfsuid
+setfsuid32
+setgid
+setgid32
+setresgid
+setresgid32
+setuid
+setuid32
+statx
+symlink
diff --git a/gpkg/glibc/fake-syscall.h b/gpkg/glibc/fake-syscall.h
@@ -0,0 +1,33 @@
+#ifndef _FAKE_SYSCALL
+#define _FAKE_SYSCALL
+
+#include <arch-syscall.h>
+#include <disabled-syscall.h>
+
+extern int close_range (unsigned int __fd, unsigned int __max_fd, int __flags) __THROW;
+
+struct FakeSyscall {
+	int id;
+	long int (*func)(long int,
+			 long int,
+			 long int,
+			 long int,
+			 long int,
+			 long int);
+};
+
+long int JustReturnZero() {
+	return 0;
+}
+
+static struct FakeSyscall FakeSyscalls[] = {
+	{ __NR_close_range, close_range },
+	{ __NR_mbind, JustReturnZero },
+	{ __NR_get_mempolicy, JustReturnZero },
+	{ __NR_set_mempolicy, JustReturnZero },
+	{ 1008, JustReturnZero }, // for some reason used in julia
+};
+
+#define CountFakeSyscalls (sizeof(FakeSyscalls) / sizeof(FakeSyscalls[0]))
+
+#endif //_FAKE_SYSCALL