[v1] eal/linux: fix memory illegal accesses
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Commit Message
'recv()' fills the 'buf', later 'strlcpy()' used to copy from this buffer.
But as coverity warns 'recv()' doesn't guarantee that 'buf' is
null-terminated, but 'strlcpy()' requires it.
Enlarge 'buf' size to 'EAL_UEV_MSG_LEN + 1' and ensure the last one can
be set to 0 when received buffer size is EAL_UEV_MSG_LEN.
CID 375864: Memory - illegal accesses (STRING_NULL)
Passing unterminated string "buf" to "dev_uev_parse", which expects
a null-terminated string.
Coverity issue: 375864
Fixes: 0d0f478d0483 ("eal/linux: add uevent parse and process")
Cc: stable@dpdk.org
Signed-off-by: Steve Yang <stevex.yang@intel.com>
---
lib/eal/linux/eal_dev.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
Comments
On 2/23/2022 8:49 AM, Steve Yang wrote:
> 'recv()' fills the 'buf', later 'strlcpy()' used to copy from this buffer.
> But as coverity warns 'recv()' doesn't guarantee that 'buf' is
> null-terminated, but 'strlcpy()' requires it.
>
> Enlarge 'buf' size to 'EAL_UEV_MSG_LEN + 1' and ensure the last one can
> be set to 0 when received buffer size is EAL_UEV_MSG_LEN.
>
> CID 375864: Memory - illegal accesses (STRING_NULL)
> Passing unterminated string "buf" to "dev_uev_parse", which expects
> a null-terminated string.
>
> Coverity issue: 375864
> Fixes: 0d0f478d0483 ("eal/linux: add uevent parse and process")
> Cc: stable@dpdk.org
>
> Signed-off-by: Steve Yang <stevex.yang@intel.com>
Acked-by: Ferruh Yigit <ferruh.yigit@intel.com>
23/02/2022 12:26, Ferruh Yigit:
> On 2/23/2022 8:49 AM, Steve Yang wrote:
> > 'recv()' fills the 'buf', later 'strlcpy()' used to copy from this buffer.
> > But as coverity warns 'recv()' doesn't guarantee that 'buf' is
> > null-terminated, but 'strlcpy()' requires it.
> >
> > Enlarge 'buf' size to 'EAL_UEV_MSG_LEN + 1' and ensure the last one can
> > be set to 0 when received buffer size is EAL_UEV_MSG_LEN.
> >
> > CID 375864: Memory - illegal accesses (STRING_NULL)
> > Passing unterminated string "buf" to "dev_uev_parse", which expects
> > a null-terminated string.
> >
> > Coverity issue: 375864
> > Fixes: 0d0f478d0483 ("eal/linux: add uevent parse and process")
> > Cc: stable@dpdk.org
> >
> > Signed-off-by: Steve Yang <stevex.yang@intel.com>
>
> Acked-by: Ferruh Yigit <ferruh.yigit@intel.com>
Applied, thanks.
@@ -231,13 +231,13 @@ dev_uev_handler(__rte_unused void *param)
{
struct rte_dev_event uevent;
int ret;
- char buf[EAL_UEV_MSG_LEN];
+ char buf[EAL_UEV_MSG_LEN + 1];
struct rte_bus *bus;
struct rte_device *dev;
const char *busname = "";
memset(&uevent, 0, sizeof(struct rte_dev_event));
- memset(buf, 0, EAL_UEV_MSG_LEN);
+ memset(buf, 0, EAL_UEV_MSG_LEN + 1);
if (rte_intr_fd_get(intr_handle) < 0)
return;