#ifndef CURVETUN_H #define CURVETUN_H #include #define FILE_CLIENTS ".curvetun/clients" #define FILE_SERVERS ".curvetun/servers" #define FILE_PRIVKEY ".curvetun/priv.key" #define FILE_PUBKEY ".curvetun/pub.key" #define FILE_USERNAM ".curvetun/username" #define LOCKFILE "/var/run/curvetun.pid" #define DEFAULT_KEY_LEN 64 #define PROTO_FLAG_EXIT (1 << 0) #define PROTO_FLAG_INIT (1 << 1) struct ct_proto { uint16_t payload; uint8_t flags; } __attribute__((packed)); /* FIXME: think up sth better */ #define TUNBUFF_SIZ (3 * RUNTIME_PAGE_SIZE) #define MAX_EPOLL_SIZE 10000 #define THREADS_PER_CPU 2 extern int server_main(char *home, char *dev, char *port, int udp, int ipv4, int log); extern int client_main(char *home, char *dev, char *host, char *port, int udp); #define DEVNAME_SERVER "curves0" #define DEVNAME_CLIENT "curvec0" #endif /* CURVETUN_H */ xt.git
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authorArd Biesheuvel <ard.biesheuvel@linaro.org>2017-02-01 17:45:02 +0000
committerIngo Molnar <mingo@kernel.org>2017-02-01 21:17:49 +0100
commitc8f325a59cfc718d13a50fbc746ed9b415c25e92 (patch)
treed53fbdac9d0781e39a13b2ac6b2bd258cf3b4140 /Documentation
parentbf29bddf0417a4783da3b24e8c9e017ac649326f (diff)
efi/fdt: Avoid FDT manipulation after ExitBootServices()
Some AArch64 UEFI implementations disable the MMU in ExitBootServices(), after which unaligned accesses to RAM are no longer supported. Commit: abfb7b686a3e ("efi/libstub/arm*: Pass latest memory map to the kernel") fixed an issue in the memory map handling of the stub FDT code, but inadvertently created an issue with such firmware, by moving some of the FDT manipulation to after the invocation of ExitBootServices(). Given that the stub's libfdt implementation uses the ordinary, accelerated string functions, which rely on hardware handling of unaligned accesses, manipulating the FDT with the MMU off may result in alignment faults. So fix the situation by moving the update_fdt_memmap() call into the callback function invoked by efi_exit_boot_services() right before it calls the ExitBootServices() UEFI service (which is arguably a better place for it anyway) Note that disabling the MMU in ExitBootServices() is not compliant with the UEFI spec, and carries great risk due to the fact that switching from cached to uncached memory accesses halfway through compiler generated code (i.e., involving a stack) can never be done in a way that is architecturally safe. Fixes: abfb7b686a3e ("efi/libstub/arm*: Pass latest memory map to the kernel") Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Tested-by: Riku Voipio <riku.voipio@linaro.org> Cc: <stable@vger.kernel.org> Cc: mark.rutland@arm.com Cc: linux-efi@vger.kernel.org Cc: matt@codeblueprint.co.uk Cc: leif.lindholm@linaro.org Cc: linux-arm-kernel@lists.infradead.org Link: http://lkml.kernel.org/r/1485971102-23330-2-git-send-email-ard.biesheuvel@linaro.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
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