link_elf_obj.c File Reference

#include <sys/cdefs.h>
#include "opt_ddb.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/fcntl.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/linker.h>
#include <sys/mutex.h>
#include <sys/mount.h>
#include <sys/namei.h>
#include <sys/proc.h>
#include <sys/rwlock.h>
#include <sys/sysctl.h>
#include <sys/vnode.h>
#include <machine/elf.h>
#include <net/vnet.h>
#include <security/mac/mac_framework.h>
#include <vm/vm.h>
#include <vm/vm_param.h>
#include <vm/pmap.h>
#include <vm/vm_extern.h>
#include <vm/vm_kern.h>
#include <vm/vm_map.h>
#include <vm/vm_object.h>
#include <vm/vm_page.h>
#include <vm/vm_pager.h>
#include <sys/link_elf.h>
#include "linker_if.h"
#include <kern/kern_ctf.c>

Include dependency graph for link_elf_obj.c:

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Data Structures
struct	Elf_progent
struct	Elf_relent
struct	Elf_relaent
struct	elf_file

Typedefs
typedef struct elf_file *	elf_file_t

Functions
	__FBSDID ("$FreeBSD$")
static int	link_elf_link_preload (linker_class_t cls, const char *, linker_file_t *)
static int	link_elf_link_preload_finish (linker_file_t)
static int	link_elf_load_file (linker_class_t, const char *, linker_file_t *)
static int	link_elf_lookup_symbol (linker_file_t, const char *, c_linker_sym_t *)
static int	link_elf_lookup_debug_symbol (linker_file_t, const char *, c_linker_sym_t *)
static int	link_elf_symbol_values (linker_file_t, c_linker_sym_t, linker_symval_t *)
static int	link_elf_debug_symbol_values (linker_file_t, c_linker_sym_t, linker_symval_t *)
static int	link_elf_search_symbol (linker_file_t, caddr_t value, c_linker_sym_t *sym, long *diffp)
static void	link_elf_unload_file (linker_file_t)
static int	link_elf_lookup_set (linker_file_t, const char *, void ***, void ***, int *)
static int	link_elf_each_function_name (linker_file_t, int(*)(const char *, void *), void *)
static int	link_elf_each_function_nameval (linker_file_t, linker_function_nameval_callback_t, void *)
static int	link_elf_reloc_local (linker_file_t, bool)
static long	link_elf_symtab_get (linker_file_t, const Elf_Sym **)
static long	link_elf_strtab_get (linker_file_t, caddr_t *)
static int	elf_obj_lookup (linker_file_t lf, Elf_Size symidx, int deps, Elf_Addr *)
	SYSCTL_BOOL (_debug, OID_AUTO, link_elf_obj_leak_locals, CTLFLAG_RWTUN, &link_elf_obj_leak_locals, 0, "Allow local symbols to participate in global module symbol resolution")
static int	relocate_file (elf_file_t ef)
static void	elf_obj_cleanup_globals_cache (elf_file_t)
static void	link_elf_error (const char *filename, const char *s)
static void	link_elf_init (void *arg)
	SYSINIT (link_elf_obj, SI_SUB_KLD, SI_ORDER_SECOND, link_elf_init, NULL)
static void	link_elf_protect_range (elf_file_t ef, vm_offset_t start, vm_offset_t end, vm_prot_t prot)
static void	link_elf_protect (elf_file_t ef)
static void	link_elf_invoke_cbs (caddr_t addr, size_t size)
static const char *	symbol_name (elf_file_t ef, Elf_Size r_info)
static Elf_Addr	findbase (elf_file_t ef, int sec)
static int	relocate_file1 (elf_file_t ef, bool ifuncs)
static int	link_elf_lookup_symbol1 (linker_file_t lf, const char *name, c_linker_sym_t *sym, bool see_local)
static int	link_elf_symbol_values1 (linker_file_t lf, c_linker_sym_t sym, linker_symval_t *symval, bool see_local)
static void	link_elf_fix_link_set (elf_file_t ef)

Variables
static kobj_method_t	link_elf_methods []
static struct linker_class	link_elf_class
static bool	link_elf_obj_leak_locals = true

Typedef Documentation

elf_file_t

typedef struct elf_file * elf_file_t

Function Documentation

__FBSDID()

__FBSDID

(

"$FreeBSD$"

)

elf_obj_cleanup_globals_cache()

static void elf_obj_cleanup_globals_cache ( elf_file_t  ef )

static

Definition at line 1629 of file link_elf_obj.c.

References elf_file::ddbsymcnt, elf_file::ddbsymtab, and sym.

Referenced by relocate_file1().

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elf_obj_lookup()

static int elf_obj_lookup ( linker_file_t  lf, Elf_Size  symidx, int  deps, Elf_Addr *  res  )

static

Definition at line 1651 of file link_elf_obj.c.

References elf_file::ddbstrtab, elf_file::ddbsymcnt, elf_file::ddbsymtab, linker_file_lookup_symbol(), res, and sym.

Referenced by link_elf_reloc_local(), and relocate_file1().

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findbase()

static Elf_Addr findbase ( elf_file_t  ef, int  sec  )

static

Definition at line 1321 of file link_elf_obj.c.

References Elf_progent::addr, elf_file::nprogtab, elf_file::progtab, and Elf_progent::sec.

Referenced by link_elf_reloc_local(), and relocate_file1().

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link_elf_debug_symbol_values()

static int link_elf_debug_symbol_values ( linker_file_t  lf, c_linker_sym_t  sym, linker_symval_t *  symval  )

static

Definition at line 1509 of file link_elf_obj.c.

References link_elf_symbol_values1(), and sym.

Referenced by link_elf_each_function_nameval().

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link_elf_each_function_name()

static int link_elf_each_function_name ( linker_file_t  file, int(*)(const char *, void *)  callback, void *  opaque  )

static

Definition at line 1583 of file link_elf_obj.c.

References callback, elf_file::ddbstrtab, elf_file::ddbsymtab, opaque, and symp.

link_elf_each_function_nameval()

static int link_elf_each_function_nameval ( linker_file_t  file, linker_function_nameval_callback_t  callback, void *  opaque  )

static

Definition at line 1604 of file link_elf_obj.c.

References callback, elf_file::ddbsymtab, link_elf_debug_symbol_values(), opaque, and symp.

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link_elf_error()

static void link_elf_error ( const char *  filename, const char *  s  )

static

Definition at line 196 of file link_elf_obj.c.

References filename, and printf().

Referenced by link_elf_load_file(), link_elf_reloc_local(), and relocate_file1().

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link_elf_fix_link_set()

static void link_elf_fix_link_set ( elf_file_t  ef )

static

Definition at line 1722 of file link_elf_obj.c.

References Elf_progent::addr, elf_file::ddbstrtab, elf_file::ddbsymcnt, elf_file::ddbsymtab, Elf_progent::name, elf_file::nprogtab, elf_file::progtab, Elf_progent::size, start, and sym.

Referenced by link_elf_reloc_local().

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link_elf_init()

static void link_elf_init ( void *  arg )

static

Definition at line 205 of file link_elf_obj.c.

References link_elf_class, and linker_add_class().

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link_elf_invoke_cbs()

static void link_elf_invoke_cbs ( caddr_t  addr, size_t  size  )

static

Definition at line 638 of file link_elf_obj.c.

References addr.

Referenced by link_elf_link_preload_finish(), link_elf_load_file(), and link_elf_unload_file().

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link_elf_link_preload()

static int link_elf_link_preload ( linker_class_t  cls, const char *  filename, linker_file_t *  result  )

static

Definition at line 336 of file link_elf_obj.c.

References __ELF_WORD_SIZE, Elf_progent::addr, elf_file::address, elf_file::ddbstrcnt, elf_file::ddbstrtab, elf_file::ddbsymcnt, elf_file::ddbsymtab, dpcpu_alloc(), dpcpu_copy(), elf_file::e_shdr, filename, Elf_progent::flags, elf_file::lf, link_elf_class, link_elf_protect_range(), link_elf_reloc_local(), linker_file_unload(), linker_make_file(), malloc(), elf_file::modptr, Elf_progent::name, elf_file::nprogtab, Elf_relent::nrel, Elf_relaent::nrela, elf_file::nrelatab, elf_file::nreltab, preload_search_by_name(), preload_search_info(), elf_file::preloaded, printf(), elf_file::progtab, Elf_relent::rel, Elf_relaent::rela, elf_file::relatab, elf_file::reltab, result, Elf_progent::sec, Elf_relent::sec, Elf_relaent::sec, elf_file::shstrcnt, elf_file::shstrtab, Elf_progent::size, and type.

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link_elf_link_preload_finish()

static int link_elf_link_preload_finish ( linker_file_t  lf )

static

Definition at line 654 of file link_elf_obj.c.

References elf_file::lf, link_elf_invoke_cbs(), link_elf_protect(), link_elf_reloc_local(), and relocate_file().

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link_elf_load_file()

static int link_elf_load_file ( linker_class_t  cls, const char *  filename, linker_file_t *  result  )

static

Definition at line 684 of file link_elf_obj.c.

References Elf_progent::addr, elf_file::address, elf_file::ddbstrcnt, elf_file::ddbstrtab, elf_file::ddbsymcnt, elf_file::ddbsymtab, dpcpu_alloc(), dpcpu_copy(), elf_file::e_shdr, filename, Elf_progent::flags, flags, free(), link_elf_class, link_elf_error(), link_elf_invoke_cbs(), link_elf_protect(), link_elf_reloc_local(), linker_file_unload(), linker_load_dependencies(), linker_make_file(), malloc(), Elf_progent::name, nbytes, NDFREE(), elf_file::nprogtab, Elf_relent::nrel, Elf_relaent::nrela, elf_file::nrelatab, elf_file::nreltab, elf_file::object, printf(), elf_file::progtab, Elf_relent::rel, Elf_relaent::rela, elf_file::relatab, relocate_file(), elf_file::reltab, result, Elf_progent::sec, Elf_relent::sec, Elf_relaent::sec, elf_file::shstrcnt, elf_file::shstrtab, Elf_progent::size, vn_close(), vn_open(), and vn_rdwr().

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link_elf_lookup_debug_symbol()

static int link_elf_lookup_debug_symbol ( linker_file_t  lf, const char *  name, c_linker_sym_t *  sym  )

static

Definition at line 1469 of file link_elf_obj.c.

References link_elf_lookup_symbol1(), name, and sym.

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link_elf_lookup_set()

static int link_elf_lookup_set ( linker_file_t  lf, const char *  name, void ***  startp, void ***  stopp, int *  countp  )

static

Definition at line 1555 of file link_elf_obj.c.

References Elf_progent::addr, count, name, Elf_progent::name, elf_file::nprogtab, elf_file::progtab, Elf_progent::size, start, and stop.

link_elf_lookup_symbol()

static int link_elf_lookup_symbol ( linker_file_t  lf, const char *  name, c_linker_sym_t *  sym  )

static

Definition at line 1462 of file link_elf_obj.c.

References link_elf_lookup_symbol1(), link_elf_obj_leak_locals, name, and sym.

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link_elf_lookup_symbol1()

static int link_elf_lookup_symbol1 ( linker_file_t  lf, const char *  name, c_linker_sym_t *  sym, bool  see_local  )

static

Definition at line 1439 of file link_elf_obj.c.

References elf_file::ddbstrtab, elf_file::ddbsymtab, name, sym, and symp.

Referenced by link_elf_lookup_debug_symbol(), and link_elf_lookup_symbol().

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link_elf_protect()

static void link_elf_protect ( elf_file_t  ef )

static

Definition at line 245 of file link_elf_obj.c.

References Elf_progent::addr, elf_file::address, Elf_progent::flags, elf_file::lf, link_elf_protect_range(), Elf_progent::name, elf_file::nprogtab, elf_file::preloaded, elf_file::progtab, Elf_progent::size, and start.

Referenced by link_elf_link_preload_finish(), and link_elf_load_file().

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link_elf_protect_range()

static void link_elf_protect_range ( elf_file_t  ef, vm_offset_t  start, vm_offset_t  end, vm_prot_t  prot  )

static

Definition at line 213 of file link_elf_obj.c.

References elf_file::address, elf_file::lf, elf_file::preloaded, and start.

Referenced by link_elf_link_preload(), and link_elf_protect().

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link_elf_reloc_local()

static int link_elf_reloc_local ( linker_file_t  lf, bool  ifuncs  )

static

Definition at line 1767 of file link_elf_obj.c.

References elf_file::ddbsymcnt, elf_file::ddbsymtab, elf_obj_lookup(), findbase(), elf_file::lf, link_elf_error(), link_elf_fix_link_set(), Elf_relent::nrel, Elf_relaent::nrela, elf_file::nrelatab, elf_file::nreltab, Elf_relent::rel, Elf_relaent::rela, elf_file::relatab, elf_file::reltab, Elf_relent::sec, Elf_relaent::sec, and sym.

Referenced by link_elf_link_preload(), link_elf_link_preload_finish(), and link_elf_load_file().

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link_elf_search_symbol()

static int link_elf_search_symbol ( linker_file_t  lf, caddr_t  value, c_linker_sym_t *  sym, long *  diffp  )

static

Definition at line 1516 of file link_elf_obj.c.

References elf_file::ddbsymtab, diffp, sym, and value.

link_elf_strtab_get()

static long link_elf_strtab_get ( linker_file_t  lf, caddr_t *  strtab  )

static

Definition at line 1855 of file link_elf_obj.c.

References elf_file::ddbstrcnt, elf_file::ddbstrtab, and strtab.

link_elf_symbol_values()

static int link_elf_symbol_values ( linker_file_t  lf, c_linker_sym_t  sym, linker_symval_t *  symval  )

static

Definition at line 1501 of file link_elf_obj.c.

References link_elf_obj_leak_locals, link_elf_symbol_values1(), and sym.

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link_elf_symbol_values1()

static int link_elf_symbol_values1 ( linker_file_t  lf, c_linker_sym_t  sym, linker_symval_t *  symval, bool  see_local  )

static

Definition at line 1476 of file link_elf_obj.c.

References elf_file::ddbstrtab, elf_file::ddbsymcnt, elf_file::ddbsymtab, and sym.

Referenced by link_elf_debug_symbol_values(), and link_elf_symbol_values().

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link_elf_symtab_get()

static long link_elf_symtab_get ( linker_file_t  lf, const Elf_Sym **  symtab  )

static

Definition at line 1844 of file link_elf_obj.c.

References elf_file::ddbsymcnt, elf_file::ddbsymtab, and symtab.

link_elf_unload_file()

static void link_elf_unload_file ( linker_file_t  file )

static

Definition at line 1250 of file link_elf_obj.c.

References Elf_progent::addr, elf_file::address, elf_file::ctfoff, elf_file::ctftab, elf_file::ddbstrtab, elf_file::ddbsymtab, dpcpu_free(), elf_file::e_shdr, free(), link_elf_invoke_cbs(), Elf_progent::name, elf_file::nprogtab, elf_file::nrelatab, elf_file::nreltab, elf_file::object, preload_delete_name(), elf_file::preloaded, elf_file::progtab, Elf_relent::rel, Elf_relaent::rela, elf_file::relatab, elf_file::reltab, elf_file::shstrtab, Elf_progent::size, and elf_file::typoff.

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relocate_file()

static int relocate_file ( elf_file_t  ef )

static

Definition at line 1428 of file link_elf_obj.c.

References relocate_file1().

Referenced by link_elf_link_preload_finish(), and link_elf_load_file().

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relocate_file1()

static int relocate_file1 ( elf_file_t  ef, bool  ifuncs  )

static

Definition at line 1336 of file link_elf_obj.c.

References elf_file::ddbsymcnt, elf_file::ddbsymtab, elf_obj_cleanup_globals_cache(), elf_obj_lookup(), findbase(), elf_file::lf, link_elf_error(), Elf_relent::nrel, Elf_relaent::nrela, elf_file::nrelatab, elf_file::nreltab, printf(), Elf_relent::rel, Elf_relaent::rela, elf_file::relatab, elf_file::reltab, Elf_relent::sec, Elf_relaent::sec, sym, and symbol_name().

Referenced by relocate_file().

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symbol_name()

static const char * symbol_name ( elf_file_t  ef, Elf_Size  r_info  )

static

Definition at line 1309 of file link_elf_obj.c.

References elf_file::ddbstrtab, and elf_file::ddbsymtab.

Referenced by relocate_file1().

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SYSCTL_BOOL()

SYSCTL_BOOL	(	_debug	,
		OID_AUTO	,
		link_elf_obj_leak_locals	,
		CTLFLAG_RWTUN	,
		&	link_elf_obj_leak_locals,
		0	,
		"Allow local symbols to participate in global module symbol resolution"
	)

SYSINIT()

SYSINIT	(	link_elf_obj	,
		SI_SUB_KLD	,
		SI_ORDER_SECOND	,
		link_elf_init	,
		NULL
	)

Variable Documentation

link_elf_class

struct linker_class link_elf_class

static

Initial value:

= {
 
        "elf32_obj",
 
 
 
        link_elf_methods, sizeof(struct elf_file)
}

Definition at line 178 of file link_elf_obj.c.

Referenced by link_elf_init(), link_elf_link_preload(), and link_elf_load_file().

link_elf_methods

kobj_method_t link_elf_methods[]

static

Initial value:

= {
        KOBJMETHOD(linker_lookup_symbol,        link_elf_lookup_symbol),
        KOBJMETHOD(linker_lookup_debug_symbol,  link_elf_lookup_debug_symbol),
        KOBJMETHOD(linker_symbol_values,        link_elf_symbol_values),
        KOBJMETHOD(linker_debug_symbol_values,  link_elf_debug_symbol_values),
        KOBJMETHOD(linker_search_symbol,        link_elf_search_symbol),
        KOBJMETHOD(linker_unload,               link_elf_unload_file),
        KOBJMETHOD(linker_load_file,            link_elf_load_file),
        KOBJMETHOD(linker_link_preload,         link_elf_link_preload),
        KOBJMETHOD(linker_link_preload_finish,  link_elf_link_preload_finish),
        KOBJMETHOD(linker_lookup_set,           link_elf_lookup_set),
        KOBJMETHOD(linker_each_function_name,   link_elf_each_function_name),
        KOBJMETHOD(linker_each_function_nameval, link_elf_each_function_nameval),
        KOBJMETHOD(linker_ctf_get,              link_elf_ctf_get),
        KOBJMETHOD(linker_symtab_get,           link_elf_symtab_get),
        KOBJMETHOD(linker_strtab_get,           link_elf_strtab_get),
        KOBJMETHOD_END
}

Definition at line 159 of file link_elf_obj.c.

link_elf_obj_leak_locals

bool link_elf_obj_leak_locals = true

static

Definition at line 187 of file link_elf_obj.c.

Referenced by link_elf_lookup_symbol(), and link_elf_symbol_values().