31d8526346
. ld.so is linked at 0 but it can relocate itself; we wish to load ld.so higher though to trap NULL dereferences. if we know we have to execute ld.so, vfs tells libexec to put it higher.
63 lines
2.6 KiB
C
63 lines
2.6 KiB
C
#ifndef _LIBEXEC_H_
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#define _LIBEXEC_H_ 1
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#include <sys/exec_elf.h>
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struct exec_info;
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typedef int (*libexec_loadfunc_t)(struct exec_info *execi,
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off_t offset, off_t vaddr, size_t len);
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typedef int (*libexec_clearfunc_t)(struct exec_info *execi,
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off_t vaddr, size_t len);
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typedef int (*libexec_allocfunc_t)(struct exec_info *execi,
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off_t vaddr, size_t len);
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typedef int (*libexec_procclearfunc_t)(struct exec_info *execi);
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struct exec_info {
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/* Filled in by libexec caller */
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endpoint_t proc_e; /* Process endpoint */
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char *hdr; /* Header or full image */
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size_t hdr_len; /* Size of hdr */
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vir_bytes frame_len; /* Stack size */
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char progname[PROC_NAME_LEN]; /* Program name */
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uid_t new_uid; /* Process UID after exec */
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gid_t new_gid; /* Process GID after exec */
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int allow_setuid; /* Allow set{u,g}id execution? */
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vir_bytes stack_size; /* Desired stack size */
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vir_bytes load_offset; /* Desired load offset */
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/* Callback pointers for use by libexec */
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libexec_loadfunc_t copymem; /* Copy callback */
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libexec_clearfunc_t clearmem; /* Clear callback */
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libexec_allocfunc_t allocmem_prealloc; /* Alloc callback */
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libexec_allocfunc_t allocmem_ondemand; /* Alloc callback */
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libexec_procclearfunc_t clearproc; /* Clear process callback */
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void *opaque; /* Callback data */
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/* Filled in by libexec load function */
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vir_bytes load_base; /* Where executable is loaded */
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vir_bytes pc; /* Entry point of exec file */
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vir_bytes stack_high; /* High stack addr */
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};
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int elf_has_interpreter(char *exec_hdr, int hdr_len, char *interp, int maxsz);
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int elf_phdr(char *exec_hdr, int hdr_len, vir_bytes *phdr);
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void libexec_patch_ptr(char stack[ARG_MAX], vir_bytes base);
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int libexec_pm_newexec(endpoint_t proc_e, struct exec_info *execi);
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typedef int (*libexec_exec_loadfunc_t)(struct exec_info *execi);
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int libexec_load_elf(struct exec_info *execi);
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int libexec_copy_memcpy(struct exec_info *execi, off_t offset, off_t vaddr, size_t len);
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int libexec_clear_memset(struct exec_info *execi, off_t vaddr, size_t len);
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int libexec_alloc_mmap_prealloc(struct exec_info *execi, off_t vaddr, size_t len);
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int libexec_alloc_mmap_ondemand(struct exec_info *execi, off_t vaddr, size_t len);
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int libexec_clearproc_vm_procctl(struct exec_info *execi);
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int libexec_clear_sys_memset(struct exec_info *execi, off_t vaddr, size_t len);
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#endif /* !_LIBEXEC_H_ */
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