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

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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>
This commit is contained in:
Felix Fietkau 2017-02-15 12:33:03 +01:00
parent df49e49bc7
commit 853bad5af2
2 changed files with 8 additions and 2 deletions
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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;