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114 lines
9.1 KiB
C
Executable File
114 lines
9.1 KiB
C
Executable File
#include "call_protected.h"
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#include "../common.h"
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#include <linux/errno.h> //common exit codes
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//#include <linux/kallsyms.h> //kallsyms_lookup_name()
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#include "helper/symbol_helper.h" //kln_func
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#include <linux/module.h> //symbol_get()/put
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//This will eventually stop working (since Linux >=5.7.0 has the kallsyms_lookup_name() removed)
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//Workaround will be needed: https://github.com/xcellerator/linux_kernel_hacking/issues/3
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#define __VOID_RETURN__
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//This macro should be used to export symbols which aren't normally EXPORT_SYMBOL/EXPORT_SYMBOL_GPL in the kernel but
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// they exist within the kernel (and not a loadable module!). Keep in mind that most of the time "static" cannot be
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// reexported using this trick.
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//All re-exported function will have _ prefix (e.g. foo() becomes _foo())
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#define DEFINE_UNEXPORTED_SHIM(return_type, org_function_name, call_args, call_vars, fail_return) \
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extern asmlinkage return_type org_function_name(call_args); \
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typedef typeof(org_function_name) *org_function_name##__ret; \
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static unsigned long org_function_name##__addr = 0; \
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return_type _##org_function_name(call_args) \
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{ \
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if (unlikely(org_function_name##__addr == 0)) { \
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org_function_name##__addr = kln_func(#org_function_name); \
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if (org_function_name##__addr == 0) { \
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pr_loc_bug("Failed to fetch %s() syscall address", #org_function_name); \
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return fail_return; \
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} \
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pr_loc_dbg("Got addr %lx for %s", org_function_name##__addr, #org_function_name); \
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} \
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\
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return ((org_function_name##__ret)org_function_name##__addr)(call_vars); \
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}
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//This macro should be used to export symbols which aren't normally EXPORT_SYMBOL/EXPORT_SYMBOL_GPL in the kernel but
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// they exist within the kernel and are defined as __init. These symbol can only be called when the system is still
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// booting (i.e. before init user-space binary was called). After that calling such functions is a lottery - the memory
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// of them is freed by free_initmem() [called in main.c:kernel_init()]. That's why we skip any caching kere as these are
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// called mostly as a one-off during boot process when this module was loaded as a I/O scheduler.
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//All re-exported function will have _ prefix (e.g. foo() becomes _foo())
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#define DEFINE_UNEXPORTED_INIT_SHIM(return_type, org_function_name, call_args, call_vars, fail_return) \
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extern asmlinkage return_type org_function_name(call_args); \
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typedef typeof(org_function_name) *org_function_name##__ret; \
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return_type _##org_function_name(call_args) \
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{ \
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unsigned long org_function_name##__addr = 0; \
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if (unlikely(!is_system_booting())) { \
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pr_loc_bug("Attempted to call %s() when the system is already booted (state=%d)", \
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#org_function_name, system_state); \
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return fail_return; \
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} \
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org_function_name##__addr = kln_func(#org_function_name); \
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if (org_function_name##__addr == 0) { \
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pr_loc_bug("Failed to fetch %s() syscall address", #org_function_name); \
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return fail_return; \
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} \
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pr_loc_dbg("Got addr %lx for %s", org_function_name##__addr, #org_function_name); \
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\
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return ((org_function_name##__ret)org_function_name##__addr)(call_vars); \
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}
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//This macro should be used to export symbols which are normally exported by modules in situations where this module
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// must be loaded before such module exporting the symbol.
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//Normally if symbol for module "X" is used in "Y" the kernel will complain that "X" muse be loaded before "Y".
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//All re-exported function will have _ prefix (e.g. foo() becomes _foo())
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#define DEFINE_DYNAMIC_SHIM(return_type, org_function_name, call_args, call_vars, fail_return) \
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extern asmlinkage return_type org_function_name(call_args); \
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typedef typeof(org_function_name) *org_function_name##__ret; \
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return_type _##org_function_name(call_args) \
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{ \
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org_function_name##__ret org_function_name##__ptr = (org_function_name##__ret)__symbol_get(#org_function_name); \
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if (!org_function_name##__ptr) { \
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pr_loc_bug("Failed to fetch %s() symbol (is that module loaded?)", #org_function_name); \
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return fail_return; \
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} \
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pr_loc_dbg("Got ptr %p for %s", org_function_name##__ptr, #org_function_name); \
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/*Doing this BEFORE the call makes a TINY window where the symbol can "escape" but it's protects from deadlock*/\
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__symbol_put(#org_function_name); \
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\
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return ((org_function_name##__ret)org_function_name##__ptr)(call_vars); \
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}
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//********************************************************************************************************************//
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DEFINE_UNEXPORTED_SHIM(int, cmdline_proc_show, CP_LIST(struct seq_file *m, void *v), CP_LIST(m, v), -EFAULT);
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DEFINE_UNEXPORTED_SHIM(void, flush_tlb_all, CP_LIST(void), CP_LIST(), __VOID_RETURN__);
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//See header file for detailed explanation what's going on here as it's more complex than a single commit
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#if LINUX_VERSION_CODE < KERNEL_VERSION(3,14,0)
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DEFINE_UNEXPORTED_SHIM(int, do_execve, CP_LIST(const char *filename,
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const char __user *const __user *__argv,
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const char __user *const __user *__envp), CP_LIST(filename, __argv, __envp), -EINTR);
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#ifndef CONFIG_AUDITSYSCALL
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DEFINE_UNEXPORTED_SHIM(void, final_putname, CP_LIST(struct filename *name), CP_LIST(name), __VOID_RETURN__);
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#else
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DEFINE_UNEXPORTED_SHIM(void, putname, CP_LIST(struct filename *name), CP_LIST(name), __VOID_RETURN__);
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#endif
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#else
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DEFINE_UNEXPORTED_SHIM(int, do_execve, CP_LIST(struct filename *filename,
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const char __user *const __user *__argv,
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const char __user *const __user *__envp), CP_LIST(filename, __argv, __envp), -EINTR);
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DEFINE_UNEXPORTED_SHIM(struct filename *, getname, CP_LIST(const char __user *name), CP_LIST(name), ERR_PTR(-EFAULT));
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#endif
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DEFINE_UNEXPORTED_SHIM(int, scsi_scan_host_selected, CP_LIST(struct Scsi_Host *shost, unsigned int channel, unsigned int id, u64 lun, int rescan), CP_LIST(shost, channel, id, lun, rescan), -EIO);
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DEFINE_UNEXPORTED_SHIM(int, ida_pre_get, CP_LIST(struct ida *ida, gfp_t gfp_mask), CP_LIST(ida, gfp_mask), -EINVAL);
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DEFINE_UNEXPORTED_SHIM(int, early_serial_setup, CP_LIST(struct uart_port *port), port, -EIO);
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DEFINE_UNEXPORTED_SHIM(int, serial8250_find_port, CP_LIST(struct uart_port *p), CP_LIST(p), -EIO);
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DEFINE_UNEXPORTED_INIT_SHIM(int, elevator_setup, CP_LIST(char *str), CP_LIST(str), -EINVAL);
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DEFINE_DYNAMIC_SHIM(void, usb_register_notify, CP_LIST(struct notifier_block *nb), CP_LIST(nb), __VOID_RETURN__);
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DEFINE_DYNAMIC_SHIM(void, usb_unregister_notify, CP_LIST(struct notifier_block *nb), CP_LIST(nb), __VOID_RETURN__);
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