From mboxrd@z Thu Jan 1 00:00:00 1970 From: srinivas.kandagatla@linaro.org (Srinivas Kandagatla) Date: Wed, 07 Oct 2015 18:01:03 +0100 Subject: [PATCH] nvmem: core: make default user binary file root-access only In-Reply-To: <20151007165046.GC12099@kroah.com> References: <1444235714-24365-1-git-send-email-srinivas.kandagatla@linaro.org> <20151007165046.GC12099@kroah.com> Message-ID: <56154FCF.6010105@linaro.org> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On 07/10/15 17:50, Greg KH wrote: > On Wed, Oct 07, 2015 at 05:35:14PM +0100, Srinivas Kandagatla wrote: >> As required by many providers like at24/at25/mxs-ocotp/qfprom, which would >> want to allow root-only to read/write the nvmem content. >> So making the defaults to be root-only access which can prevent normal >> users from reading the nvmem data. >> >> Signed-off-by: Srinivas Kandagatla >> --- >> drivers/nvmem/core.c | 4 ++-- >> 1 file changed, 2 insertions(+), 2 deletions(-) >> >> diff --git a/drivers/nvmem/core.c b/drivers/nvmem/core.c >> index 6fd4e5a..4d2e476 100644 >> --- a/drivers/nvmem/core.c >> +++ b/drivers/nvmem/core.c >> @@ -112,7 +112,7 @@ static ssize_t bin_attr_nvmem_write(struct file *filp, struct kobject *kobj, >> static struct bin_attribute bin_attr_rw_nvmem = { >> .attr = { >> .name = "nvmem", >> - .mode = S_IWUSR | S_IRUGO, >> + .mode = S_IWUSR | S_IRUSR, >> }, >> .read = bin_attr_nvmem_read, >> .write = bin_attr_nvmem_write, >> @@ -136,7 +136,7 @@ static const struct attribute_group *nvmem_rw_dev_groups[] = { >> static struct bin_attribute bin_attr_ro_nvmem = { >> .attr = { >> .name = "nvmem", >> - .mode = S_IRUGO, >> + .mode = S_IRUSR, >> }, >> .read = bin_attr_nvmem_read, >> }; > > How about using BIN_ATTR_RO() and friends instead, that way I _know_ you > got the permissions correct as it's impossible to get them wrong by > using those macros. Yes, that sounds good, but there are no macros for just "S_IRUSR" or "(S_IWUSR | S_IRUSR)" in ./include/linux/sysfs.h --srini > > thanks, > > greg k-h >