MIPS: Make virt_to_phys() work for all unmapped addresses.
As reported: This problem was discovered when doing BGP traffic with the TCP MD5 option activated, where the following call chain caused a crash: * tcp_v4_rcv * tcp_v4_timewait_ack * tcp_v4_send_ack -> follow stack variable rep.th * tcp_v4_md5_hash_hdr * tcp_md5_hash_header * sg_init_one * sg_set_buf * virt_to_page I noticed that tcp_v4_send_reset uses a similar stack variable and also calls tcp_v4_md5_hash_hdr, so it has the same problem. The networking core can indirectly call virt_to_phys() on stack addresses, if this is done from PID 0, the stack will usually be in CKSEG0, so virt_to_phys() needs to work there as well Signed-off-by: David Daney <david.daney@cavium.com> Cc: linux-mips@linux-mips.org Cc: Jiang Liu <liuj97@gmail.com> Cc: eunb.song@samsung.com Cc: linux-kernel@vger.kernel.org Patchwork: https://patchwork.linux-mips.org/patch/5220/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
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@ -118,7 +118,7 @@ static inline void set_io_port_base(unsigned long base)
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*/
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static inline unsigned long virt_to_phys(volatile const void *address)
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{
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return (unsigned long)address - PAGE_OFFSET + PHYS_OFFSET;
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return __pa(address);
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}
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/*
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@ -46,7 +46,6 @@
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#endif /* CONFIG_MIPS_HUGE_TLB_SUPPORT */
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#include <linux/pfn.h>
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#include <asm/io.h>
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extern void build_clear_page(void);
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extern void build_copy_page(void);
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@ -151,6 +150,7 @@ typedef struct { unsigned long pgprot; } pgprot_t;
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((unsigned long)(x) - PAGE_OFFSET + PHYS_OFFSET)
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#endif
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#define __va(x) ((void *)((unsigned long)(x) + PAGE_OFFSET - PHYS_OFFSET))
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#include <asm/io.h>
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/*
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* RELOC_HIDE was originally added by 6007b903dfe5f1d13e0c711ac2894bdd4a61b1ad
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