Date: Wed, 20 Nov 2013 11:10:24 +0000 (UTC) From: Grzegorz Bernacki <gber@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r258387 - head/sys/dev/nand Message-ID: <201311201110.rAKBAOMY061212@svn.freebsd.org>
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Author: gber Date: Wed Nov 20 11:10:23 2013 New Revision: 258387 URL: http://svnweb.freebsd.org/changeset/base/258387 Log: Split raw reading/programming into smaller chunks to avoid allocating too big chunk of kernel memory. Validate size of data. Add error handling to avoid calling copyout() when data has not been read correctly. Reviewed by: zbb Reported by: x90c <geinblues@gmail.com> MFC after: 2 days Modified: head/sys/dev/nand/nand_cdev.c head/sys/dev/nand/nand_geom.c Modified: head/sys/dev/nand/nand_cdev.c ============================================================================== --- head/sys/dev/nand/nand_cdev.c Wed Nov 20 11:09:12 2013 (r258386) +++ head/sys/dev/nand/nand_cdev.c Wed Nov 20 11:10:23 2013 (r258387) @@ -294,19 +294,39 @@ nand_ioctl(struct cdev *dev, u_long cmd, struct thread *td) { struct nand_chip *chip; + struct chip_geom *cg; struct nand_oob_rw *oob_rw = NULL; struct nand_raw_rw *raw_rw = NULL; device_t nandbus; + size_t bufsize, len, raw_size; + off_t off; uint8_t *buf = NULL; int ret = 0; uint8_t status; chip = (struct nand_chip *)dev->si_drv1; + cg = &chip->chip_geom; nandbus = device_get_parent(chip->dev); if ((cmd == NAND_IO_RAW_READ) || (cmd == NAND_IO_RAW_PROG)) { raw_rw = (struct nand_raw_rw *)data; - buf = malloc(raw_rw->len, M_NAND, M_WAITOK); + raw_size = cg->pgs_per_blk * (cg->page_size + cg->oob_size); + + /* Check if len is not bigger than chip size */ + if (raw_rw->len > raw_size) + return (EFBIG); + + /* + * Do not ask for too much memory, in case of large transfers + * read/write in 16-pages chunks + */ + bufsize = 16 * (cg->page_size + cg->oob_size); + if (raw_rw->len < bufsize) + bufsize = raw_rw->len; + + buf = malloc(bufsize, M_NAND, M_WAITOK); + len = raw_rw->len; + off = 0; } switch(cmd) { case NAND_IO_ERASE: @@ -335,19 +355,37 @@ nand_ioctl(struct cdev *dev, u_long cmd, break; case NAND_IO_RAW_PROG: - ret = copyin(raw_rw->data, buf, raw_rw->len); - if (ret) - break; - ret = nand_prog_pages_raw(chip, raw_rw->off, buf, - raw_rw->len); + while (len > 0) { + if (len < bufsize) + bufsize = len; + ret = copyin(raw_rw->data + off, buf, bufsize); + if (ret) + break; + ret = nand_prog_pages_raw(chip, raw_rw->off + off, buf, + bufsize); + if (ret) + break; + len -= bufsize; + off += bufsize; + } break; case NAND_IO_RAW_READ: - ret = nand_read_pages_raw(chip, raw_rw->off, buf, - raw_rw->len); - if (ret) - break; - ret = copyout(buf, raw_rw->data, raw_rw->len); + while (len > 0) { + if (len < bufsize) + bufsize = len; + + ret = nand_read_pages_raw(chip, raw_rw->off + off, buf, + bufsize); + if (ret) + break; + + ret = copyout(buf, raw_rw->data + off, bufsize); + if (ret) + break; + len -= bufsize; + off += bufsize; + } break; case NAND_IO_PAGE_STAT: Modified: head/sys/dev/nand/nand_geom.c ============================================================================== --- head/sys/dev/nand/nand_geom.c Wed Nov 20 11:09:12 2013 (r258386) +++ head/sys/dev/nand/nand_geom.c Wed Nov 20 11:10:23 2013 (r258387) @@ -193,20 +193,41 @@ nand_ioctl(struct disk *ndisk, u_long cm struct thread *td) { struct nand_chip *chip; + struct chip_geom *cg; struct nand_oob_rw *oob_rw = NULL; struct nand_raw_rw *raw_rw = NULL; device_t nandbus; + size_t bufsize, len, raw_size; + off_t off; uint8_t *buf = NULL; int ret = 0; uint8_t status; chip = (struct nand_chip *)ndisk->d_drv1; + cg = &chip->chip_geom; nandbus = device_get_parent(chip->dev); if ((cmd == NAND_IO_RAW_READ) || (cmd == NAND_IO_RAW_PROG)) { raw_rw = (struct nand_raw_rw *)data; - buf = malloc(raw_rw->len, M_NAND, M_WAITOK); + raw_size = cg->pgs_per_blk * (cg->page_size + cg->oob_size); + + /* Check if len is not bigger than chip size */ + if (raw_rw->len > raw_size) + return (EFBIG); + + /* + * Do not ask for too much memory, in case of large transfers + * read/write in 16-pages chunks + */ + bufsize = 16 * (cg->page_size + cg->oob_size); + if (raw_rw->len < bufsize) + bufsize = raw_rw->len; + + buf = malloc(bufsize, M_NAND, M_WAITOK); + len = raw_rw->len; + off = 0; } + switch (cmd) { case NAND_IO_ERASE: ret = nand_erase_blocks(chip, ((off_t *)data)[0], @@ -234,15 +255,38 @@ nand_ioctl(struct disk *ndisk, u_long cm break; case NAND_IO_RAW_PROG: - copyin(raw_rw->data, buf, raw_rw->len); - ret = nand_prog_pages_raw(chip, raw_rw->off, buf, - raw_rw->len); + while (len > 0) { + if (len < bufsize) + bufsize = len; + + ret = copyin(raw_rw->data + off, buf, bufsize); + if (ret) + break; + ret = nand_prog_pages_raw(chip, raw_rw->off + off, buf, + bufsize); + if (ret) + break; + len -= bufsize; + off += bufsize; + } break; case NAND_IO_RAW_READ: - ret = nand_read_pages_raw(chip, raw_rw->off, buf, - raw_rw->len); - copyout(buf, raw_rw->data, raw_rw->len); + while (len > 0) { + if (len < bufsize) + bufsize = len; + + ret = nand_read_pages_raw(chip, raw_rw->off + off, buf, + bufsize); + if (ret) + break; + + ret = copyout(buf, raw_rw->data + off, bufsize); + if (ret) + break; + len -= bufsize; + off += bufsize; + } break; case NAND_IO_GET_CHIP_PARAM:
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