b3f95490b9
This adds initial support for kernel 4.14 based on the patches for kernel 4.9. In the configuration I deactivated some of the new possible security features like: CONFIG_REFCOUNT_FULL CONFIG_SLAB_FREELIST_HARDENED CONFIG_SOFTLOCKUP_DETECTOR CONFIG_WARN_ALL_UNSEEDED_RANDOM And these overlay FS options are also deactivated: CONFIG_OVERLAY_FS_INDEX CONFIG_OVERLAY_FS_REDIRECT_DIR I activated this: CONFIG_FORTIFY_SOURCE CONFIG_POSIX_TIMERS CONFIG_SLAB_MERGE_DEFAULT CONFIG_WATCHDOG_HANDLE_BOOT_ENABLED I am not sure if I did the porting correct for the following patches: target/linux/generic/backport-4.14/020-backport_netfilter_rtcache.patch target/linux/generic/hack-4.14/220-gc_sections.patch target/linux/generic/hack-4.14/321-powerpc_crtsavres_prereq.patch target/linux/generic/pending-4.14/305-mips_module_reloc.patch target/linux/generic/pending-4.14/611-netfilter_match_bypass_default_table.patch target/linux/generic/pending-4.14/680-NET-skip-GRO-for-foreign-MAC-addresses.patch Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
31 lines
886 B
Diff
31 lines
886 B
Diff
From: Felix Fietkau <nbd@nbd.name>
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Subject: MIPS: fix cache flushing for highmem pages
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Most cache flush ops were no-op for highmem pages. This led to nasty
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segfaults and (in the case of page_address(page) == NULL) kernel
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crashes.
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Fix this by always flushing highmem pages using kmap/kunmap_atomic
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around the actual cache flush. This might be a bit inefficient, but at
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least it's stable.
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Signed-off-by: Felix Fietkau <nbd@nbd.name>
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---
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--- a/arch/mips/mm/cache.c
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+++ b/arch/mips/mm/cache.c
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@@ -116,6 +116,13 @@ void __flush_anon_page(struct page *page
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{
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unsigned long addr = (unsigned long) page_address(page);
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+ if (PageHighMem(page)) {
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+ addr = (unsigned long)kmap_atomic(page);
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+ flush_data_cache_page(addr);
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+ __kunmap_atomic((void *)addr);
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+ return;
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+ }
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+
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if (pages_do_alias(addr, vmaddr)) {
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if (page_mapcount(page) && !Page_dcache_dirty(page)) {
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void *kaddr;
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