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78 lines
4.2 KiB
C
Executable File
78 lines
4.2 KiB
C
Executable File
#ifndef REDPILLLKM_CALL_PROTECTED_H
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#define REDPILLLKM_CALL_PROTECTED_H
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#include <linux/version.h> //LINUX_VERSION_CODE, KERNEL_VERSION
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#include <linux/types.h> //bool
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#include <linux/kernel.h> //system_states & system_state
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// *************************************** Useful macros *************************************** //
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//Check if the system is still in booting stage (useful when you want to call __init functions as they're deleted)
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#define is_system_booting() (system_state == SYSTEM_BOOTING)
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// ************************** Exports of normally protected functions ************************** //
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//A usual macros to make defining them easier & consistent with .c implementation
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#define CP_LIST(...) __VA_ARGS__ //used to pass a list of arguments as a single argument
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#define CP_DECLARE_SHIM(return_type, org_function_name, call_args) return_type _##org_function_name(call_args);
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struct seq_file;
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CP_DECLARE_SHIM(int, cmdline_proc_show, CP_LIST(struct seq_file *m, void *v)); //extracts kernel cmdline
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CP_DECLARE_SHIM(void, flush_tlb_all, CP_LIST(void)); //used to flush caches in memory.c operations
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/* Thanks Jeff... https://groups.google.com/g/kernel-meetup-bangalore/c/rvQccTl_3kc/m/BJCnnXGCAgAJ
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* In case the link disappears: Jeff Layton from RedHat decided to just nuke the getname() API after 7 years of it being
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* exposed in the kernel. So in practice we need to use kallsyms to get it on kernels >=3.14 (up to current 5.14)
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* See https://github.com/torvalds/linux/commit/9115eac2c788c17b57c9256cb322fa7371972ddf
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* Another unrelated change which happened in v3.14 was that when "struct filename*" is passed the callee is responsible
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* for freeing it (using putname()). However, in older versions we (the caller) needs to free it
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* See https://github.com/torvalds/linux/commit/c4ad8f98bef77c7356aa6a9ad9188a6acc6b849d
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*
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* This whole block deals with functions needed for execve() shimming
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*/
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struct filename;
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#if LINUX_VERSION_CODE < KERNEL_VERSION(3,14,0)
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CP_DECLARE_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));
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#include <linux/fs.h>
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#define _getname(...) getname(__VA_ARGS__)
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//If syscall audit is disabled putname is an alias to final_putname(), see include/linux/fs.h; later on this was changed
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// but this branch needs to handle only <3.14 as we don't need (and shouldn't use!) putname() in >=3.14
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#ifndef CONFIG_AUDITSYSCALL //if CONFIG_AUDITSYSCALL disabled we unexport final_putname and add putname define line fs.h
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#define _putname(name) _final_putname(name)
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CP_DECLARE_SHIM(void, final_putname, CP_LIST(struct filename *name));
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#else //if the CONFIG_AUDITSYSCALL is enabled we need to proxy to traced putname to make sure references are counted
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CP_DECLARE_SHIM(void, putname, CP_LIST(struct filename *name));
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#endif
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#else
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CP_DECLARE_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));
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CP_DECLARE_SHIM(struct filename *, getname, CP_LIST(const char __user *name));
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#endif
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//The following functions are used by vUART and uart_fixer
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typedef struct uart_port *uart_port_p;
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CP_DECLARE_SHIM(int, early_serial_setup, CP_LIST(struct uart_port *port));
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CP_DECLARE_SHIM(int, serial8250_find_port, CP_LIST(struct uart_port *p));
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//Exported so that we can forcefully rescan the SCSI host in scsi_toolbox. This operation is normally available in
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// userland when you're a root, but somehow they missed an export for kernel code (which according to kernel rules is a
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// bug, but probably nobody asked before)
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struct Scsi_Host;
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CP_DECLARE_SHIM(int, scsi_scan_host_selected,
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CP_LIST(struct Scsi_Host *shost, unsigned int channel, unsigned int id, u64 lun, int rescan));
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struct ida;
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CP_DECLARE_SHIM(int, ida_pre_get, CP_LIST(struct ida *ida, gfp_t gfp_mask));
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//Used for fixing I/O scheduler if module was loaded using elevator= and broke it
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CP_DECLARE_SHIM(int, elevator_setup, CP_LIST(char *str));
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struct notifier_block;
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CP_DECLARE_SHIM(void, usb_register_notify, CP_LIST(struct notifier_block *nb));
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CP_DECLARE_SHIM(void, usb_unregister_notify, CP_LIST(struct notifier_block *nb));
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#endif //REDPILLLKM_CALL_PROTECTED_H
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