/* * Squashfs - a compressed read only filesystem for Linux * * Copyright (c) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010 * Phillip Lougher * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version 2, * or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. * * xz_wrapper.c */ #include #include #include #include #include #include "squashfs_fs.h" #include "squashfs_fs_sb.h" #include "squashfs.h" #include "decompressor.h" #include "page_actor.h" struct squashfs_xz { struct xz_dec *state; struct xz_buf buf; }; struct disk_comp_opts { __le32 dictionary_size; __le32 flags; }; struct comp_opts { int dict_size; }; static void *squashfs_xz_comp_opts(struct squashfs_sb_info *msblk, void *buff, int len) { struct disk_comp_opts *comp_opts = buff; struct comp_opts *opts; int err = 0, n; opts = kmalloc(sizeof(*opts), GFP_KERNEL); if (opts == NULL) { err = -ENOMEM; goto out2; } if (comp_opts) { /* check compressor options are the expected length */ if (len < sizeof(*comp_opts)) { err = -EIO; goto out; } opts->dict_size = le32_to_cpu(comp_opts->dictionary_size); /* the dictionary size should be 2^n or 2^n+2^(n+1) */ n = ffs(opts->dict_size) - 1; if (opts->dict_size != (1 << n) && opts->dict_size != (1 << n) + (1 << (n + 1))) { err = -EIO; goto out; } } else /* use defaults */ opts->dict_size = max_t(int, msblk->block_size, SQUASHFS_METADATA_SIZE); return opts; out: kfree(opts); out2: return ERR_PTR(err); } static void *squashfs_xz_init(struct squashfs_sb_info *msblk, void *buff) { struct comp_opts *comp_opts = buff; struct squashfs_xz *stream; int err; stream = kmalloc(sizeof(*stream), GFP_KERNEL); if (stream == NULL) { err = -ENOMEM; goto failed; } stream->state = xz_dec_init(XZ_PREALLOC, comp_opts->dict_size); if (stream->state == NULL) { kfree(stream); err = -ENOMEM; goto failed; } return stream; failed: ERROR("Failed to initialise xz decompressor\n"); return ERR_PTR(err); } static void squashfs_xz_free(void *strm) { struct squashfs_xz *stream = strm; if (stream) { xz_dec_end(stream->state); kfree(stream); } } static int squashfs_xz_uncompress(struct squashfs_sb_info *msblk, void *strm, struct buffer_head **bh, int b, int offset, int length, struct squashfs_page_actor *output) { enum xz_ret xz_err; int avail, total = 0, k = 0; struct squashfs_xz *stream = strm; xz_dec_reset(stream->state); stream->buf.in_pos = 0; stream->buf.in_size = 0; stream->buf.out_pos = 0; stream->buf.out_size = PAGE_SIZE; stream->buf.out = squashfs_first_page(output); do { if (stream->buf.in_pos == stream->buf.in_size && k < b) { avail = min(length, msblk->devblksize - offset); length -= avail; stream->buf.in = bh[k]->b_data + offset; stream->buf.in_size = avail; stream->buf.in_pos = 0; offset = 0; } if (stream->buf.out_pos == stream->buf.out_size) { stream->buf.out = squashfs_next_page(output); if (stream->buf.out != NULL) { stream->buf.out_pos = 0; total += PAGE_SIZE; } } xz_err = xz_dec_run(stream->state, &stream->buf); if (stream->buf.in_pos == stream->buf.in_size && k < b) put_bh(bh[k++]); } while (xz_err == XZ_OK); squashfs_finish_page(output); if (xz_err != XZ_STREAM_END || k < b) goto out; return total + stream->buf.out_pos; out: for (; k < b; k++) put_bh(bh[k]); return -EIO; } const struct squashfs_decompressor squashfs_xz_comp_ops = { .init = squashfs_xz_init, .comp_opts = squashfs_xz_comp_opts, .free = squashfs_xz_free, .decompress = squashfs_xz_uncompress, .id = XZ_COMPRESSION, .name = "xz", .supported = 1 }; lass='ctrl'>
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 /drivers/usb/host/ehci-w90x900.c
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 'drivers/usb/host/ehci-w90x900.c')