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author | Felix Fietkau <nbd@openwrt.org> | 2009-12-20 04:41:10 +0000 |
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committer | Felix Fietkau <nbd@openwrt.org> | 2009-12-20 04:41:10 +0000 |
commit | 6859128d3aec5f589af1611876f31863b8e1f8b9 (patch) | |
tree | 35468c68e0a140fbaf56ce451066b7f2c885f651 /target/linux/generic-2.6/patches-2.6.30/027-mips_module_reloc.patch | |
parent | fa044a2d81d7cfa2f3b2d96983e3caabb77431b2 (diff) | |
download | master-31e0f0ae-6859128d3aec5f589af1611876f31863b8e1f8b9.tar.gz master-31e0f0ae-6859128d3aec5f589af1611876f31863b8e1f8b9.tar.bz2 master-31e0f0ae-6859128d3aec5f589af1611876f31863b8e1f8b9.zip |
kernel: fix plt fixup related crashes when loading kernel modules on mips, (happened when there was not enough physically contiguous memory available)
SVN-Revision: 18858
Diffstat (limited to 'target/linux/generic-2.6/patches-2.6.30/027-mips_module_reloc.patch')
-rw-r--r-- | target/linux/generic-2.6/patches-2.6.30/027-mips_module_reloc.patch | 119 |
1 files changed, 78 insertions, 41 deletions
diff --git a/target/linux/generic-2.6/patches-2.6.30/027-mips_module_reloc.patch b/target/linux/generic-2.6/patches-2.6.30/027-mips_module_reloc.patch index ca87662676..019489f94e 100644 --- a/target/linux/generic-2.6/patches-2.6.30/027-mips_module_reloc.patch +++ b/target/linux/generic-2.6/patches-2.6.30/027-mips_module_reloc.patch @@ -16,10 +16,10 @@ const struct exception_table_entry *dbe_start; const struct exception_table_entry *dbe_end; + -+ void *plt_tbl; -+ unsigned int core_plt_offset; -+ unsigned int core_plt_size; -+ unsigned int init_plt_offset; ++ void *phys_plt_tbl; ++ void *virt_plt_tbl; ++ unsigned int phys_plt_offset; ++ unsigned int virt_plt_offset; }; typedef uint8_t Elf64_Byte; /* Type for a 8-bit quantity. */ @@ -142,7 +142,7 @@ void *module_alloc(unsigned long size) { #ifdef MODULE_START -@@ -58,16 +168,45 @@ void *module_alloc(unsigned long size) +@@ -58,23 +168,101 @@ void *module_alloc(unsigned long size) return __vmalloc_area(area, GFP_KERNEL, PAGE_KERNEL); #else @@ -190,7 +190,26 @@ /* FIXME: If module_region == mod->init_region, trim exception table entries. */ } -@@ -75,6 +214,24 @@ void module_free(struct module *mod, voi + ++static void *__module_alloc(int size, bool phys) ++{ ++ void *ptr; ++ ++ if (phys) ++ ptr = kmalloc(size, GFP_KERNEL); ++ else ++ ptr = vmalloc(size); ++ return ptr; ++} ++ ++static void __module_free(void *ptr) ++{ ++ if (is_phys_addr(ptr)) ++ kfree(ptr); ++ else ++ vfree(ptr); ++} ++ int module_frob_arch_sections(Elf_Ehdr *hdr, Elf_Shdr *sechdrs, char *secstrings, struct module *mod) { @@ -205,17 +224,29 @@ + core_size = get_plt_size(hdr, sechdrs, secstrings, symindex, false); + init_size = get_plt_size(hdr, sechdrs, secstrings, symindex, true); + -+ mod->arch.core_plt_offset = 0; -+ mod->arch.core_plt_size = core_size; -+ mod->arch.init_plt_offset = core_size; -+ mod->arch.plt_tbl = kmalloc(core_size + init_size, GFP_KERNEL); -+ if (!mod->arch.plt_tbl) ++ mod->arch.phys_plt_offset = 0; ++ mod->arch.virt_plt_offset = 0; ++ mod->arch.phys_plt_tbl = NULL; ++ mod->arch.virt_plt_tbl = NULL; ++ ++ if ((core_size + init_size) == 0) ++ return 0; ++ ++ mod->arch.phys_plt_tbl = __module_alloc(core_size + init_size, 1); ++ if (!mod->arch.phys_plt_tbl) + return -ENOMEM; + ++ mod->arch.virt_plt_tbl = __module_alloc(core_size + init_size, 0); ++ if (!mod->arch.virt_plt_tbl) { ++ __module_free(mod->arch.phys_plt_tbl); ++ mod->arch.phys_plt_tbl = NULL; ++ return -ENOMEM; ++ } ++ return 0; } -@@ -97,27 +254,41 @@ static int apply_r_mips_32_rela(struct m +@@ -97,27 +285,37 @@ static int apply_r_mips_32_rela(struct m return 0; } @@ -236,42 +267,39 @@ - return -ENOEXEC; - } + *plt_offset += 4 * sizeof(int); -+ + +- *location = (*location & ~0x03ffffff) | +- ((*location + (v >> 2)) & 0x03ffffff); + /* adjust carry for addiu */ + if (v & 0x00008000) + v += 0x10000; -+ + +- return 0; + tramp[0] = 0x3c190000 | (v >> 16); /* lui t9, hi16 */ + tramp[1] = 0x27390000 | (v & 0xffff); /* addiu t9, t9, lo16 */ + tramp[2] = 0x03200008; /* jr t9 */ + tramp[3] = 0x00000000; /* nop */ - -- *location = (*location & ~0x03ffffff) | -- ((*location + (v >> 2)) & 0x03ffffff); -+ return (Elf_Addr) tramp; -+} + -+static Elf_Addr add_plt_entry(struct module *me, void *location, Elf_Addr v) -+{ -+ if (location >= me->module_core && -+ location < me->module_core + me->core_size) -+ return add_plt_entry_to(&me->arch.core_plt_offset, -+ me->arch.plt_tbl, v); -+ -+ if (location >= me->module_init && -+ location < me->module_init + me->init_size) -+ return add_plt_entry_to(&me->arch.init_plt_offset, -+ me->arch.plt_tbl, v); - - return 0; ++ return (Elf_Addr) tramp; } -static int apply_r_mips_26_rela(struct module *me, u32 *location, Elf_Addr v) ++static Elf_Addr add_plt_entry(struct module *me, void *location, Elf_Addr v) ++{ ++ if (is_phys_addr(location)) ++ return add_plt_entry_to(&me->arch.phys_plt_offset, ++ me->arch.phys_plt_tbl, v); ++ else ++ return add_plt_entry_to(&me->arch.virt_plt_offset, ++ me->arch.virt_plt_tbl, v); ++ ++} ++ +static int set_r_mips_26(struct module *me, u32 *location, u32 ofs, Elf_Addr v) { if (v % 4) { printk(KERN_ERR "module %s: dangerous relocation\n", me->name); -@@ -125,17 +296,31 @@ static int apply_r_mips_26_rela(struct m +@@ -125,17 +323,31 @@ static int apply_r_mips_26_rela(struct m } if ((v & 0xf0000000) != (((unsigned long)location + 4) & 0xf0000000)) { @@ -306,18 +334,20 @@ static int apply_r_mips_hi16_rel(struct module *me, u32 *location, Elf_Addr v) { struct mips_hi16 *n; -@@ -400,11 +585,23 @@ int module_finalize(const Elf_Ehdr *hdr, +@@ -400,11 +612,32 @@ int module_finalize(const Elf_Ehdr *hdr, list_add(&me->arch.dbe_list, &dbe_list); spin_unlock_irq(&dbe_lock); } + + /* Get rid of the fixup trampoline if we're running the module + * from physically mapped address space */ -+ if (me->arch.core_plt_offset == 0 && -+ me->arch.init_plt_offset == me->arch.core_plt_size && -+ is_phys_addr(me->module_core)) { -+ kfree(me->arch.plt_tbl); -+ me->arch.plt_tbl = NULL; ++ if (me->arch.phys_plt_offset == 0) { ++ __module_free(me->arch.phys_plt_tbl); ++ me->arch.phys_plt_tbl = NULL; ++ } ++ if (me->arch.virt_plt_offset == 0) { ++ __module_free(me->arch.virt_plt_tbl); ++ me->arch.virt_plt_tbl = NULL; + } + return 0; @@ -325,8 +355,15 @@ void module_arch_cleanup(struct module *mod) { -+ if (mod->arch.plt_tbl) -+ kfree(mod->arch.plt_tbl); ++ if (mod->arch.phys_plt_tbl) { ++ __module_free(mod->arch.phys_plt_tbl); ++ mod->arch.phys_plt_tbl = NULL; ++ } ++ if (mod->arch.virt_plt_tbl) { ++ __module_free(mod->arch.virt_plt_tbl); ++ mod->arch.virt_plt_tbl = NULL; ++ } ++ spin_lock_irq(&dbe_lock); list_del(&mod->arch.dbe_list); spin_unlock_irq(&dbe_lock); |