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Force the kernel to dynamically reallocate the preloaded modules.

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This commit is contained in:
maxv 2016-07-08 08:55:48 +00:00
parent bdcbfcd17f
commit e169fdcc18
1 changed files with 34 additions and 49 deletions
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83
sys/kern/subr_kobj.c
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@ -1,4 +1,4 @@
/* $NetBSD: subr_kobj.c,v 1.53 2016/07/07 06:55:43 msaitoh Exp $ */
/* $NetBSD: subr_kobj.c,v 1.54 2016/07/08 08:55:48 maxv Exp $ */
/*-
* Copyright (c) 2008 The NetBSD Foundation, Inc.
@ -63,7 +63,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: subr_kobj.c,v 1.53 2016/07/07 06:55:43 msaitoh Exp $");
__KERNEL_RCSID(0, "$NetBSD: subr_kobj.c,v 1.54 2016/07/08 08:55:48 maxv Exp $");
#ifdef _KERNEL_OPT
#include "opt_modular.h"
@ -392,14 +392,11 @@ kobj_load(kobj_t ko)
* Size up code/data(progbits) and bss(nobits).
*/
alignmask = 0;
mapbase = 0;
mapsize = 0;
for (i = 0; i < hdr->e_shnum; i++) {
switch (shdr[i].sh_type) {
case SHT_PROGBITS:
case SHT_NOBITS:
if (mapbase == 0)
mapbase = shdr[i].sh_offset;
alignmask = shdr[i].sh_addralign - 1;
mapsize += alignmask;
mapsize &= ~alignmask;
@ -416,19 +413,17 @@ kobj_load(kobj_t ko)
if (mapsize == 0) {
kobj_error(ko, "no text/data/bss");
error = ENOEXEC;
goto out;
}
mapbase = uvm_km_alloc(module_map, round_page(mapsize),
0, UVM_KMF_WIRED | UVM_KMF_EXEC);
if (mapbase == 0) {
kobj_error(ko, "out of memory");
error = ENOMEM;
goto out;
}
if (ko->ko_type == KT_MEMORY) {
mapbase += (vaddr_t)ko->ko_source;
} else {
mapbase = uvm_km_alloc(module_map, round_page(mapsize),
0, UVM_KMF_WIRED | UVM_KMF_EXEC);
if (mapbase == 0) {
kobj_error(ko, "out of memory");
error = ENOMEM;
goto out;
}
}
ko->ko_address = mapbase;
ko->ko_size = mapsize;
@ -445,21 +440,11 @@ kobj_load(kobj_t ko)
case SHT_PROGBITS:
case SHT_NOBITS:
alignmask = shdr[i].sh_addralign - 1;
if (ko->ko_type == KT_MEMORY) {
addr = (void *)(shdr[i].sh_offset +
(vaddr_t)ko->ko_source);
if (((vaddr_t)addr & alignmask) != 0) {
kobj_error(ko,
"section %d not aligned", i);
error = ENOEXEC;
goto out;
}
} else {
mapbase += alignmask;
mapbase &= ~alignmask;
addr = (void *)mapbase;
mapbase += shdr[i].sh_size;
}
mapbase += alignmask;
mapbase &= ~alignmask;
addr = (void *)mapbase;
mapbase += shdr[i].sh_size;
ko->ko_progtab[pb].addr = addr;
if (shdr[i].sh_type == SHT_PROGBITS) {
ko->ko_progtab[pb].name = "<<PROGBITS>>";
@ -469,16 +454,11 @@ kobj_load(kobj_t ko)
kobj_error(ko, "read failed %d", error);
goto out;
}
} else if (ko->ko_type == KT_MEMORY &&
shdr[i].sh_size != 0) {
kobj_error(ko, "non-loadable BSS "
"section in pre-loaded module");
error = ENOEXEC;
goto out;
} else {
} else { /* SHT_NOBITS */
ko->ko_progtab[pb].name = "<<NOBITS>>";
memset(addr, 0, shdr[i].sh_size);
}
ko->ko_progtab[pb].size = shdr[i].sh_size;
ko->ko_progtab[pb].sec = i;
if (ko->ko_shstrtab != NULL && shdr[i].sh_name != 0) {
@ -555,7 +535,7 @@ kobj_load(kobj_t ko)
panic("%s:%d: %s: lost rela", __func__, __LINE__,
ko->ko_name);
}
if (ko->ko_type != KT_MEMORY && mapbase != ko->ko_address + mapsize) {
if (mapbase != ko->ko_address + mapsize) {
panic("%s:%d: %s: "
"mapbase 0x%lx != address %lx + mapsize %ld (0x%lx)\n",
__func__, __LINE__, ko->ko_name,
@ -606,7 +586,7 @@ kobj_unload(kobj_t ko)
kobj_error(ko, "machine dependent deinit failed %d",
error);
}
if (ko->ko_address != 0 && ko->ko_type != KT_MEMORY) {
if (ko->ko_address != 0) {
uvm_km_free(module_map, ko->ko_address, round_page(ko->ko_size),
UVM_KMF_WIRED);
}
@ -1023,23 +1003,29 @@ kobj_read_mem(kobj_t ko, void **basep, size_t size, off_t off,
void *base = *basep;
int error;
KASSERT(ko->ko_source != NULL);
if (ko->ko_memsize != -1 && off + size > ko->ko_memsize) {
kobj_error(ko, "preloaded object short");
error = EINVAL;
base = NULL;
} else if (allocate) {
base = (uint8_t *)ko->ko_source + off;
base = kmem_alloc(size, KM_SLEEP);
error = 0;
} else if ((uint8_t *)base != (uint8_t *)ko->ko_source + off) {
kobj_error(ko, "object not aligned");
kobj_error(ko, "source=%p base=%p off=%d "
"size=%zu", ko->ko_source, base, (int)off, size);
error = EINVAL;
} else {
/* Nothing to do. Loading in-situ. */
error = 0;
}
if (error == 0) {
/* Copy the section */
memcpy(base, (uint8_t *)ko->ko_source + off, size);
}
if (allocate && error != 0) {
kmem_free(base, size);
base = NULL;
}
if (allocate)
*basep = base;
@ -1055,8 +1041,7 @@ static void
kobj_free(kobj_t ko, void *base, size_t size)
{
if (ko->ko_type != KT_MEMORY)
kmem_free(base, size);
kmem_free(base, size);
}
extern char module_base[];