* Coverity: _iwl_dbgfs_fw_dbg_domain_write(): Insecure data handling
@ 2019-11-04 17:42 coverity-bot
2019-11-25 10:35 ` Luciano Coelho
0 siblings, 1 reply; 2+ messages in thread
From: coverity-bot @ 2019-11-04 17:42 UTC (permalink / raw)
To: Shahar S Matityahu; +Cc: Luca Coelho, Gustavo A. R. Silva, linux-next
Hello!
This is an experimental automated report about issues detected by Coverity
from a scan of next-20191031 as part of the linux-next weekly scan project:
https://scan.coverity.com/projects/linux-next-weekly-scan
You're getting this email because you were associated with the identified
lines of code (noted below) that were touched by recent commits:
068893b7a28f ("iwlwifi: dbg_ini: support domain changing via debugfs")
Coverity reported the following:
*** CID 1487394: Insecure data handling (TAINTED_SCALAR)
/drivers/net/wireless/intel/iwlwifi/fw/debugfs.c: 355 in _iwl_dbgfs_fw_dbg_domain_write()
349 size_t size, char *buf)
350 {
351 return scnprintf(buf, size, "0x%08x\n",
352 fwrt->trans->dbg.domains_bitmap);
353 }
354
vvv CID 1487394: Insecure data handling (TAINTED_SCALAR)
vvv Passing tainted variable "buf" to a tainted sink.
355 FWRT_DEBUGFS_READ_WRITE_FILE_OPS(fw_dbg_domain, 20);
356
357 void iwl_fwrt_dbgfs_register(struct iwl_fw_runtime *fwrt,
358 struct dentry *dbgfs_dir)
359 {
360 INIT_DELAYED_WORK(&fwrt->timestamp.wk, iwl_fw_timestamp_marker_wk);
361 FWRT_DEBUGFS_ADD_FILE(timestamp_marker, dbgfs_dir, 0200);
362 FWRT_DEBUGFS_ADD_FILE(send_hcmd, dbgfs_dir, 0200);
363 FWRT_DEBUGFS_ADD_FILE(fw_dbg_domain, dbgfs_dir, 0600);
If this is a false positive, please let us know so we can mark it as
such, or teach the Coverity rules to be smarter. If not, please make
sure fixes get into linux-next. :) For patches fixing this, please
include these lines (but double-check the "Fixes" first):
Reported-by: coverity-bot <keescook+coverity-bot@chromium.org>
Addresses-Coverity-ID: 1487394 ("Insecure data handling")
Fixes: 068893b7a28f ("iwlwifi: dbg_ini: support domain changing via debugfs")
Thanks for your attention!
--
Coverity-bot
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: Coverity: _iwl_dbgfs_fw_dbg_domain_write(): Insecure data handling
2019-11-04 17:42 Coverity: _iwl_dbgfs_fw_dbg_domain_write(): Insecure data handling coverity-bot
@ 2019-11-25 10:35 ` Luciano Coelho
0 siblings, 0 replies; 2+ messages in thread
From: Luciano Coelho @ 2019-11-25 10:35 UTC (permalink / raw)
To: coverity-bot, Shahar S Matityahu; +Cc: Gustavo A. R. Silva, linux-next
On Mon, 2019-11-04 at 09:42 -0800, coverity-bot wrote:
> Hello!
>
> This is an experimental automated report about issues detected by Coverity
> from a scan of next-20191031 as part of the linux-next weekly scan project:
> https://scan.coverity.com/projects/linux-next-weekly-scan
>
> You're getting this email because you were associated with the identified
> lines of code (noted below) that were touched by recent commits:
>
> 068893b7a28f ("iwlwifi: dbg_ini: support domain changing via debugfs")
>
> Coverity reported the following:
>
> *** CID 1487394: Insecure data handling (TAINTED_SCALAR)
> /drivers/net/wireless/intel/iwlwifi/fw/debugfs.c: 355 in _iwl_dbgfs_fw_dbg_domain_write()
> 349 size_t size, char *buf)
> 350 {
> 351 return scnprintf(buf, size, "0x%08x\n",
> 352 fwrt->trans->dbg.domains_bitmap);
> 353 }
> 354
> vvv CID 1487394: Insecure data handling (TAINTED_SCALAR)
> vvv Passing tainted variable "buf" to a tainted sink.
> 355 FWRT_DEBUGFS_READ_WRITE_FILE_OPS(fw_dbg_domain, 20);
> 356
> 357 void iwl_fwrt_dbgfs_register(struct iwl_fw_runtime *fwrt,
> 358 struct dentry *dbgfs_dir)
> 359 {
> 360 INIT_DELAYED_WORK(&fwrt->timestamp.wk, iwl_fw_timestamp_marker_wk);
> 361 FWRT_DEBUGFS_ADD_FILE(timestamp_marker, dbgfs_dir, 0200);
> 362 FWRT_DEBUGFS_ADD_FILE(send_hcmd, dbgfs_dir, 0200);
> 363 FWRT_DEBUGFS_ADD_FILE(fw_dbg_domain, dbgfs_dir, 0600);
>
> If this is a false positive, please let us know so we can mark it as
> such, or teach the Coverity rules to be smarter. If not, please make
> sure fixes get into linux-next. :) For patches fixing this, please
> include these lines (but double-check the "Fixes" first):
>
> Reported-by: coverity-bot <keescook+coverity-bot@chromium.org>
> Addresses-Coverity-ID: 1487394 ("Insecure data handling")
> Fixes: 068893b7a28f ("iwlwifi: dbg_ini: support domain changing via debugfs")
>
>
> Thanks for your attention!
We have removed the "write" part of this debugfs entry, so this is not
applicable anymore.
Thanks for reporting!
--
Cheers,
Luca.
^ permalink raw reply [flat|nested] 2+ messages in thread
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2019-11-25 10:35 ` Luciano Coelho
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