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Message-ID: <20090701235439.GC16727@securecomputing.com>
Date: Thu, 2 Jul 2009 09:54:39 +1000
From: David McCullough <David_Mccullough@...urecomputing.com>
To: Mike Frysinger <vapier@...too.org>
Cc: linux-kernel@...r.kernel.org,
uclinux-dist-devel@...ckfin.uclinux.org,
David Howells <dhowells@...hat.com>,
Greg Ungerer <gerg@...inux.org>,
Paul Mundt <lethal@...ux-sh.org>, uclinux-dev@...inux.org
Subject: Re: [PATCH] FLAT: use IS_ERR_VALUE() helper macro
Jivin Mike Frysinger lays it down ...
> There is a common macro now for testing mixed pointer/errno values, so use
> that rather than handling the casts ourself.
>
> Signed-off-by: Mike Frysinger <vapier@...too.org>
Acked-by: David McCullough <david_mccullough@...urecomputing.com>
Cheers,
Davidm
> ---
> fs/binfmt_flat.c | 22 ++++++++++------------
> 1 files changed, 10 insertions(+), 12 deletions(-)
>
> diff --git a/fs/binfmt_flat.c b/fs/binfmt_flat.c
> index 697f6b5..f22b312 100644
> --- a/fs/binfmt_flat.c
> +++ b/fs/binfmt_flat.c
> @@ -278,8 +278,6 @@ static int decompress_exec(
> ret = bprm->file->f_op->read(bprm->file, buf, LBUFSIZE, &fpos);
> if (ret <= 0)
> break;
> - if (ret >= (unsigned long) -4096)
> - break;
> len -= ret;
>
> strm.next_in = buf;
> @@ -335,7 +333,7 @@ calc_reloc(unsigned long r, struct lib_info *p, int curid, int internalp)
> "(%d != %d)", (unsigned) r, curid, id);
> goto failed;
> } else if ( ! p->lib_list[id].loaded &&
> - load_flat_shared_library(id, p) > (unsigned long) -4096) {
> + IS_ERR_VALUE(load_flat_shared_library(id, p))) {
> printk("BINFMT_FLAT: failed to load library %d", id);
> goto failed;
> }
> @@ -545,7 +543,7 @@ static int load_flat_file(struct linux_binprm * bprm,
> textpos = do_mmap(bprm->file, 0, text_len, PROT_READ|PROT_EXEC,
> MAP_PRIVATE|MAP_EXECUTABLE, 0);
> up_write(¤t->mm->mmap_sem);
> - if (!textpos || textpos >= (unsigned long) -4096) {
> + if (!textpos || IS_ERR_VALUE(textpos)) {
> if (!textpos)
> textpos = (unsigned long) -ENOMEM;
> printk("Unable to mmap process text, errno %d\n", (int)-textpos);
> @@ -560,7 +558,7 @@ static int load_flat_file(struct linux_binprm * bprm,
> PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE, 0);
> up_write(¤t->mm->mmap_sem);
>
> - if (realdatastart == 0 || realdatastart >= (unsigned long)-4096) {
> + if (realdatastart == 0 || IS_ERR_VALUE(realdatastart)) {
> if (!realdatastart)
> realdatastart = (unsigned long) -ENOMEM;
> printk("Unable to allocate RAM for process data, errno %d\n",
> @@ -587,7 +585,7 @@ static int load_flat_file(struct linux_binprm * bprm,
> result = bprm->file->f_op->read(bprm->file, (char *) datapos,
> data_len + (relocs * sizeof(unsigned long)), &fpos);
> }
> - if (result >= (unsigned long)-4096) {
> + if (IS_ERR_VALUE(result)) {
> printk("Unable to read data+bss, errno %d\n", (int)-result);
> do_munmap(current->mm, textpos, text_len);
> do_munmap(current->mm, realdatastart, data_len + extra);
> @@ -607,7 +605,7 @@ static int load_flat_file(struct linux_binprm * bprm,
> PROT_READ | PROT_EXEC | PROT_WRITE, MAP_PRIVATE, 0);
> up_write(¤t->mm->mmap_sem);
>
> - if (!textpos || textpos >= (unsigned long) -4096) {
> + if (!textpos || IS_ERR_VALUE(textpos)) {
> if (!textpos)
> textpos = (unsigned long) -ENOMEM;
> printk("Unable to allocate RAM for process text/data, errno %d\n",
> @@ -641,7 +639,7 @@ static int load_flat_file(struct linux_binprm * bprm,
> fpos = 0;
> result = bprm->file->f_op->read(bprm->file,
> (char *) textpos, text_len, &fpos);
> - if (result < (unsigned long) -4096)
> + if (!IS_ERR_VALUE(result))
> result = decompress_exec(bprm, text_len, (char *) datapos,
> data_len + (relocs * sizeof(unsigned long)), 0);
> }
> @@ -651,13 +649,13 @@ static int load_flat_file(struct linux_binprm * bprm,
> fpos = 0;
> result = bprm->file->f_op->read(bprm->file,
> (char *) textpos, text_len, &fpos);
> - if (result < (unsigned long) -4096) {
> + if (!IS_ERR_VALUE(result)) {
> fpos = ntohl(hdr->data_start);
> result = bprm->file->f_op->read(bprm->file, (char *) datapos,
> data_len + (relocs * sizeof(unsigned long)), &fpos);
> }
> }
> - if (result >= (unsigned long)-4096) {
> + if (IS_ERR_VALUE(result)) {
> printk("Unable to read code+data+bss, errno %d\n",(int)-result);
> do_munmap(current->mm, textpos, text_len + data_len + extra +
> MAX_SHARED_LIBS * sizeof(unsigned long));
> @@ -830,7 +828,7 @@ static int load_flat_shared_library(int id, struct lib_info *libs)
>
> res = prepare_binprm(&bprm);
>
> - if (res <= (unsigned long)-4096)
> + if (!IS_ERR_VALUE(res))
> res = load_flat_file(&bprm, libs, id, NULL);
> if (bprm.file) {
> allow_write_access(bprm.file);
> @@ -873,7 +871,7 @@ static int load_flat_binary(struct linux_binprm * bprm, struct pt_regs * regs)
> stack_len += FLAT_DATA_ALIGN - 1; /* reserve for upcoming alignment */
>
> res = load_flat_file(bprm, &libinfo, 0, &stack_len);
> - if (res > (unsigned long)-4096)
> + if (IS_ERR_VALUE(res))
> return res;
>
> /* Update data segment pointers for all libraries */
> --
> 1.6.3.3
>
--
David McCullough, david_mccullough@...urecomputing.com, Ph:+61 734352815
McAfee - SnapGear http://www.snapgear.com http://www.uCdot.org
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