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kernel: fix crashes on MIPS when loading kernel modules under memory pressure 

When memory is tight, modules may need to be loaded into vmalloc()
space. The code then has to generate jump trampolines which enable
relocations between vmalloc space and physical address space.

The code had a bug that was freeing these trampolines even when the
module was successfully loaded.

Signed-off-by: Felix Fietkau <nbd@nbd.name>
owl
Felix Fietkau 2017-02-15 12:33:03 +01:00
parent 2a6fbce121
commit 1e1a0592f8
3 changed files with 12 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
target/linux/generic/patches-3.18/305-mips_module_reloc.patch
View File

@ -317,7 +317,7 @@
return 0;
}
@@ -287,9 +529,33 @@ int module_finalize(const Elf_Ehdr *hdr,
@@ -287,9 +529,36 @@ int module_finalize(const Elf_Ehdr *hdr,
list_add(&me->arch.dbe_list, &dbe_list);
spin_unlock_irq(&dbe_lock);
}
@ -338,6 +338,9 @@
+void module_arch_freeing_init(struct module *mod)
+{
+ if (mod->state == MODULE_STATE_LIVE)
+ return;
+
+ if (mod->arch.phys_plt_tbl) {
+ __module_free(mod->arch.phys_plt_tbl);
+ mod->arch.phys_plt_tbl = NULL;

5
target/linux/generic/patches-4.4/305-mips_module_reloc.patch
View File

@ -316,7 +316,7 @@
return 0;
}
@@ -287,9 +528,33 @@ int module_finalize(const Elf_Ehdr *hdr,
@@ -287,9 +528,36 @@ int module_finalize(const Elf_Ehdr *hdr,
list_add(&me->arch.dbe_list, &dbe_list);
spin_unlock_irq(&dbe_lock);
}
@ -337,6 +337,9 @@
+void module_arch_freeing_init(struct module *mod)
+{
+ if (mod->state == MODULE_STATE_LIVE)
+ return;
+
+ if (mod->arch.phys_plt_tbl) {
+ __module_free(mod->arch.phys_plt_tbl);
+ mod->arch.phys_plt_tbl = NULL;

5
target/linux/generic/patches-4.9/305-mips_module_reloc.patch
View File

@ -315,7 +315,7 @@
return 0;
}
@@ -349,9 +591,33 @@ int module_finalize(const Elf_Ehdr *hdr,
@@ -349,9 +591,36 @@ int module_finalize(const Elf_Ehdr *hdr,
list_add(&me->arch.dbe_list, &dbe_list);
spin_unlock_irq(&dbe_lock);
}
@ -336,6 +336,9 @@
+void module_arch_freeing_init(struct module *mod)
+{
+ if (mod->state == MODULE_STATE_LIVE)
+ return;
+
+ if (mod->arch.phys_plt_tbl) {
+ __module_free(mod->arch.phys_plt_tbl);
+ mod->arch.phys_plt_tbl = NULL;