/* * netsniff-ng - the packet sniffing beast * Copyright 2011 - 2013 Daniel Borkmann. * Subject to the GPL, version 2. */ #define _GNU_SOURCE #include #include #include #include #include #include #include #include "pcap_io.h" #include "built_in.h" #include "ioops.h" #include "iosched.h" static size_t map_size = 0; static char *ptr_va_start, *ptr_va_curr; static void __pcap_mmap_write_need_remap(int fd) { int ret; off_t pos, map_size_old = map_size; off_t offset = ptr_va_curr - ptr_va_start; map_size = PAGE_ALIGN(map_size_old * 10 / 8); pos = lseek(fd, map_size, SEEK_SET); if (pos < 0) panic("Cannot lseek pcap file!\n"); ret = write_or_die(fd, "", 1); if (ret != 1) panic("Cannot write file!\n"); ptr_va_start = mremap(ptr_va_start, map_size_old, map_size, MREMAP_MAYMOVE); if (ptr_va_start == MAP_FAILED) panic("mmap of file failed!"); ret = madvise(ptr_va_start, map_size, MADV_SEQUENTIAL); if (ret < 0) panic("Failed to give kernel mmap advise!\n"); ptr_va_curr = ptr_va_start + offset; } static ssize_t pcap_mm_write(int fd, pcap_pkthdr_t *phdr, enum pcap_type type, const uint8_t *packet, size_t len) { size_t hdrsize = pcap_get_hdr_length(phdr, type); if ((off_t) (ptr_va_curr - ptr_va_start) + hdrsize + len > map_size) __pcap_mmap_write_need_remap(fd); fmemcpy(ptr_va_curr, &phdr->raw, hdrsize); ptr_va_curr += hdrsize; fmemcpy(ptr_va_curr, packet, len); ptr_va_curr += len; return hdrsize + len; } static ssize_t pcap_mm_read(int fd, pcap_pkthdr_t *phdr, enum pcap_type type, uint8_t *packet, size_t len) { size_t hdrsize = pcap_get_hdr_length(phdr, type), hdrlen; if (unlikely((off_t) (ptr_va_curr + hdrsize - ptr_va_start) > map_size)) return -EIO; fmemcpy(&phdr->raw, ptr_va_curr, hdrsize); ptr_va_curr += hdrsize; hdrlen = pcap_get_length(phdr, type); if (unlikely((off_t) (ptr_va_curr + hdrlen - ptr_va_start) > map_size)) return -EIO; if (unlikely(hdrlen == 0 || hdrlen > len)) return -EINVAL; fmemcpy(packet, ptr_va_curr, hdrlen); ptr_va_curr += hdrlen; return hdrsize + hdrlen; } static inline off_t ____get_map_size(bool jumbo) { int allocsz = jumbo ? 16 : 3; return PAGE_ALIGN(sizeof(struct pcap_filehdr) + (PAGE_SIZE * allocsz) * 1024); } static void __pcap_mm_prepare_access_wr(int fd, bool jumbo) { int ret; off_t pos; struct stat sb; map_size = ____get_map_size(jumbo); ret = fstat(fd, &sb); if (ret < 0) panic("Cannot fstat pcap file!\n"); if (!S_ISREG (sb.st_mode)) panic("pcap dump file is not a regular file!\n"); pos = lseek(fd, map_size, SEEK_SET); if (pos < 0) panic("Cannot lseek pcap file!\n"); ret = write_or_die(fd, "", 1); if (ret != 1) panic("Cannot write file!\n"); ptr_va_start = mmap(0, map_size, PROT_WRITE, MAP_SHARED, fd, 0); if (ptr_va_start == MAP_FAILED) panic("mmap of file failed!"); ret = madvise(ptr_va_start, map_size, MADV_SEQUENTIAL); if (ret < 0) panic("Failed to give kernel mmap advise!\n"); ptr_va_curr = ptr_va_start + sizeof(struct pcap_filehdr); } static void __pcap_mm_prepare_access_rd(int fd) { int ret; struct stat sb; ret = fstat(fd, &sb); if (ret < 0) panic("Cannot fstat pcap file!\n"); if (!S_ISREG (sb.st_mode)) panic("pcap dump file is not a regular file!\n"); map_size = sb.st_size; ptr_va_start = mmap(0, map_size, PROT_READ, MAP_SHARED | MAP_LOCKED, fd, 0); if (ptr_va_start == MAP_FAILED) panic("mmap of file failed!"); ret = madvise(ptr_va_start, map_size, MADV_SEQUENTIAL); if (ret < 0) panic("Failed to give kernel mmap advise!\n"); ptr_va_curr = ptr_va_start + sizeof(struct pcap_filehdr); } static void pcap_mm_init_once(void) { set_ioprio_be(); } static int pcap_mm_prepare_access(int fd, enum pcap_mode mode, bool jumbo) { switch (mode) { case PCAP_MODE_RD: __pcap_mm_prepare_access_rd(fd); break; case PCAP_MODE_WR: __pcap_mm_prepare_access_wr(fd, jumbo); break; default: bug(); } return 0; } static void pcap_mm_fsync(int fd) { msync(ptr_va_start, (off_t) (ptr_va_curr - ptr_va_start), MS_ASYNC); } static void pcap_mm_prepare_close(int fd, enum pcap_mode mode) { int ret; ret = munmap(ptr_va_start, map_size); if (ret < 0) panic("Cannot unmap the pcap file!\n"); if (mode == PCAP_MODE_WR) { ret = ftruncate(fd, (off_t) (ptr_va_curr - ptr_va_start)); if (ret) panic("Cannot truncate the pcap file!\n"); } } const struct pcap_file_ops pcap_mm_ops = { .init_once_pcap = pcap_mm_init_once, .pull_fhdr_pcap = pcap_generic_pull_fhdr, .push_fhdr_pcap = pcap_generic_push_fhdr, .prepare_access_pcap = pcap_mm_prepare_access, .prepare_close_pcap = pcap_mm_prepare_close, .read_pcap = pcap_mm_read, .write_pcap = pcap_mm_write, .fsync_pcap = pcap_mm_fsync, }; it/commit/sound/soc/sh?id=c8f325a59cfc718d13a50fbc746ed9b415c25e92'>c8f325a59cfc718d13a50fbc746ed9b415c25e92 (patch) treed53fbdac9d0781e39a13b2ac6b2bd258cf3b4140 /sound/soc/sh 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>
Diffstat (limited to 'sound/soc/sh')