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Use which instead of type, which searches $PATH #2

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Use which instead of type, which searches $PATH #2

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martinpaljak
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This way there are no errors shown during bootstrap

@LudovicRousseau
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What problem does this patch solve?

@LudovicRousseau
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I found your comment. No need to reply.

@LudovicRousseau
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Fixed in f18a27c

LudovicRousseau added a commit that referenced this pull request Nov 13, 2015
@LudovicRousseau
CreateChannelByNameOrChannel(): call FreeChannel() in case of error
522ebb2 
If the creation of a channel fails then call FreeChannel() instead of
IFDHCloseChannel().
The ressources are unalocated but with no access at the lower layer.

Since the creation failed the channel is not correctly created and
only part of the reader stucture is initialised.

The problem was discovered with the folowing problem:
Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x7ffff6fe2700 (LWP 6120)]
0x00007ffff5dca8f2 in CmdPowerOff (reader_index=0) at commands.c:1076
1076		cmd[6] = (*ccid_descriptor->pbSeq)++;
(gdb) print ccid_descriptor
$1 = (_ccid_descriptor *) 0x7ffff5fe0468 <usbDevice+40>
(gdb) print ccid_descriptor->pbSeq
$2 = (unsigned char *) 0x0

The pbSeq pointer is NULL and can't be dereferenced.

(gdb) bt
 #0  0x00007ffff5dca8f2 in CmdPowerOff (reader_index=0) at commands.c:1076
 #1  0x00007ffff5dce556 in IFDHCloseChannel (Lun=0) at ifdhandler.c:269
 #2  0x00007ffff5dce773 in CreateChannelByNameOrChannel (Lun=0,
     lpcDevice=0x269 <error: Cannot access memory at address 0x269>, Channel=0)
     at ifdhandler.c:194
 #3  0x000000000040673a in IFDOpenIFD (rContext=rContext@entry=0x61e010)
     at ifdwrapper.c:136
 #4  0x0000000000408151 in RFInitializeReader (rContext=0x61e010)
     at readerfactory.c:1036
 #5  0x0000000000408a93 in RFAddReader (readerNameLong=<optimized out>,
     port=2097152, library=<optimized out>,
     device=0x7ffff6fe1d30 "usb:08e6/3437:libusb-1.0:1:2:0")
     at readerfactory.c:329
 #6  0x000000000040d9d4 in HPAddHotPluggable (dev=0x0,
     bus_device=0x61d660 <readerTracker+32> "", interface=0,
     driver=<optimized out>, driver=<optimized out>, desc=...)
     at hotplug_libusb.c:608
 #7  0x000000000040dd2a in HPRescanUsbBus () at hotplug_libusb.c:373
 #8  0x000000000040dfa1 in HPEstablishUSBNotifications (pipefd=0x7fffffffe440)
     at hotplug_libusb.c:429
 #9  0x00007ffff75a30a4 in start_thread (arg=0x7ffff6fe2700)
     at pthread_create.c:309
 #10 0x00007ffff72d804d in clone ()
     at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111
@draganafcb draganafcb mentioned this pull request Oct 3, 2018
Closed
LudovicRousseau added a commit that referenced this pull request Sep 1, 2019
@LudovicRousseau
ccid_open_hack_pre(): fix bug for ICCD type A & B devices
4c11649 
The CmdPowerOn() used a wrong value for voltage selection.

Thanks to Coverity:
CID 1453380 (#2 of 2): Out-of-bounds access (OVERRUN)
6. overrun-call: Overrunning callee's array of size 4 by passing
argument 8 in call to CmdPowerOn.
LudovicRousseau added a commit that referenced this pull request Aug 8, 2020
@LudovicRousseau
T0ProcACK: fix a potential problem
6c0bcf3 
" Apparently, the fuzzer found one more similar bug: T0ProcACK() can be
called with the |proc_len| parameter equal to -1, leading to
stack-buffer-overflow.

The stack trace is:

    #1 0x56eee7 in T0ProcACK /ssd/ccid/src/fuzzer/../commands.c:1988:3
    #2 0x56d1d1 in CmdXfrBlockCHAR_T0 /ssd/ccid/src/fuzzer/../commands.c:2253:20
    #3 0x5754cc in IFDHTransmitToICC /ssd/ccid/src/fuzzer/../ifdhandler.c:1403:17

and the T0ProcACK() call is made from this line:
https://salsa.debian.org/rousseau/CCID/-/blob/c122e4f38cc7d1ffdb1fc0cece49145930d4634a/src/commands.c#L2197

The negative |proc_len| is the result of this equation: |exp_len -
*rcv_len|, with exp_len=2, *rcv_len=3 in the found scenario. "

The problem has been found by an automatic buzzer, not by a real problem
in the field.

Thanks to Maksim Ivanov for the bug report
LudovicRousseau added a commit that referenced this pull request Apr 3, 2022
@LudovicRousseau
IFDHSetProtocolParameters: get convention before using it
0b33473 
In case the reader defines CCID_CLASS_AUTO_PPS_PROP i.e. 25% or readers
according to https://ccid.apdu.fr/select_readers/?dwFeatures=6 AND the
card ATR declares ATR_CONVENTION_INVERSE i.e. 6% of cards according to
https://ludovicrousseau.blogspot.com/2016/02/atr-statistics-ts-initial-character.html
then the parameters settings were wrong.

Thanks to Coverity for the bug report:
CID 1503362 (#2 of 2): Uninitialized scalar variable (UNINIT)15.
uninit_use: Using uninitialized value convention.
LudovicRousseau added a commit that referenced this pull request Oct 23, 2023
@LudovicRousseau
Fix thread safe issue
72f2f23 
Declare LogLevel as _Atomic as it can be accessed from 2 different
threads.

==================
WARNING: ThreadSanitizer: data race (pid=35789)
  Write of size 4 at 0x7f123aafe310 by thread T3 (mutexes: write M0):
    #0 IFDHICCPresence CCID/src/ifdhandler.c:1986:12 (libccid.so+0xaa94) (BuildId: 34d145182e49b1532fafda06218243582b2f9366)
    #1 IFDStatusICC PCSC/src/ifdwrapper.c:349:7 (pcscd+0xd7725) (BuildId: 4d1e07aaf5145539b5a42a2ed57bb9b51830ddfe)
    #2 EHStatusHandlerThread PCSC/src/eventhandler.c:332:8 (pcscd+0xd6b26) (BuildId: 4d1e07aaf5145539b5a42a2ed57bb9b51830ddfe)

  Previous read of size 4 at 0x7f123aafe310 by thread T10:
    #0 IFDHSetCapabilities CCID/src/ifdhandler.c:696:2 (libccid.so+0xb032) (BuildId: 34d145182e49b1532fafda06218243582b2f9366)
    #1 IFDSetCapabilities PCSC/src/ifdwrapper.c:221:7 (pcscd+0xe6bc7) (BuildId: 4d1e07aaf5145539b5a42a2ed57bb9b51830ddfe)
    #2 SCardSetAttrib PCSC/src/winscard.c:1470:7 (pcscd+0xe6bc7)
    #3 ContextThread PCSC/src/winscard_svc.c:792:16 (pcscd+0xe6bc7)
    #4 __tsan_thread_start_func <null> (pcscd+0x53d66) (BuildId: 4d1e07aaf5145539b5a42a2ed57bb9b51830ddfe)
    #5 __tsan_thread_start_func <null> (pcscd+0x53d66) (BuildId: 4d1e07aaf5145539b5a42a2ed57bb9b51830ddfe)

  As if synchronized via sleep:
    #0 nanosleep <null> (pcscd+0x515ed) (BuildId: 4d1e07aaf5145539b5a42a2ed57bb9b51830ddfe)
    #1 SYS_USleep PCSC/src/sys_unix.c:87:9 (pcscd+0xd709a) (BuildId: 4d1e07aaf5145539b5a42a2ed57bb9b51830ddfe)
    #2 EHStatusHandlerThread PCSC/src/eventhandler.c (pcscd+0xd709a)
    #3 __tsan_thread_start_func <null> (pcscd+0x53d66) (BuildId: 4d1e07aaf5145539b5a42a2ed57bb9b51830ddfe)

  Location is global 'LogLevel' of size 4 at 0x7f123aafe310 (libccid.so+0x22310)

  Mutex M0 (0x7b0c00000ed0) created at:
    #0 pthread_mutex_init <null> (pcscd+0x555cf) (BuildId: 4d1e07aaf5145539b5a42a2ed57bb9b51830ddfe)
    #1 RFAddReader PCSC/src/readerfactory.c:355:9 (pcscd+0xdb5aa) (BuildId: 4d1e07aaf5145539b5a42a2ed57bb9b51830ddfe)
    #2 HPAddDevice PCSC/src/hotplug_libudev.c:512:8 (pcscd+0xe33c9) (BuildId: 4d1e07aaf5145539b5a42a2ed57bb9b51830ddfe)
    #3 HPScanUSB PCSC/src/hotplug_libudev.c:579:3 (pcscd+0xe29dd) (BuildId: 4d1e07aaf5145539b5a42a2ed57bb9b51830ddfe)
    #4 HPRegisterForHotplugEvents PCSC/src/hotplug_libudev.c:761:2 (pcscd+0xe29dd)
    #5 main PCSC/src/pcscdaemon.c:766:7 (pcscd+0xd87e7) (BuildId: 4d1e07aaf5145539b5a42a2ed57bb9b51830ddfe)

  Thread T3 (tid=35793, running) created by main thread at:
    #0 pthread_create <null> (pcscd+0x53dfd) (BuildId: 4d1e07aaf5145539b5a42a2ed57bb9b51830ddfe)
    #1 ThreadCreate PCSC/src/utils.c:184:8 (pcscd+0xe3c6b) (BuildId: 4d1e07aaf5145539b5a42a2ed57bb9b51830ddfe)
    #2 EHSpawnEventHandler PCSC/src/eventhandler.c:233:7 (pcscd+0xd6910) (BuildId: 4d1e07aaf5145539b5a42a2ed57bb9b51830ddfe)
    #3 RFAddReader PCSC/src/readerfactory.c:397:8 (pcscd+0xdb7ad) (BuildId: 4d1e07aaf5145539b5a42a2ed57bb9b51830ddfe)
    #4 HPAddDevice PCSC/src/hotplug_libudev.c:512:8 (pcscd+0xe33c9) (BuildId: 4d1e07aaf5145539b5a42a2ed57bb9b51830ddfe)
    #5 HPScanUSB PCSC/src/hotplug_libudev.c:579:3 (pcscd+0xe29dd) (BuildId: 4d1e07aaf5145539b5a42a2ed57bb9b51830ddfe)
    #6 HPRegisterForHotplugEvents PCSC/src/hotplug_libudev.c:761:2 (pcscd+0xe29dd)
    #7 main PCSC/src/pcscdaemon.c:766:7 (pcscd+0xd87e7) (BuildId: 4d1e07aaf5145539b5a42a2ed57bb9b51830ddfe)

  Thread T10 (tid=40070, running) created by main thread at:
    #0 pthread_create <null> (pcscd+0x53dfd) (BuildId: 4d1e07aaf5145539b5a42a2ed57bb9b51830ddfe)
    #1 ThreadCreate PCSC/src/utils.c:184:8 (pcscd+0xe3c6b) (BuildId: 4d1e07aaf5145539b5a42a2ed57bb9b51830ddfe)
    #2 CreateContextThread PCSC/src/winscard_svc.c:239:7 (pcscd+0xd931e) (BuildId: 4d1e07aaf5145539b5a42a2ed57bb9b51830ddfe)
    #3 SVCServiceRunLoop PCSC/src/pcscdaemon.c:131:9 (pcscd+0xd931e)
    #4 main PCSC/src/pcscdaemon.c:799:2 (pcscd+0xd88e0) (BuildId: 4d1e07aaf5145539b5a42a2ed57bb9b51830ddfe)
    #5 main PCSC/src/pcscdaemon.c:799:2 (pcscd+0xd88e0) (BuildId: 4d1e07aaf5145539b5a42a2ed57bb9b51830ddfe)

SUMMARY: ThreadSanitizer: data race CCID/src/ifdhandler.c:1986:12 in IFDHICCPresence
==================
LudovicRousseau added a commit that referenced this pull request Oct 23, 2023
@LudovicRousseau
Fix thread safe issue
765b338 
Declare ReaderIndex[] as _Atomic as it can be accessed from 2 different
threads.

==================
WARNING: ThreadSanitizer: data race (pid=4017)
  Write of size 4 at 0x7fd1b32be970 by main thread (mutexes: write M0, write M1):
    #0 ReleaseReaderIndex CCID/src/utils.c:81:21 (libccid.so+0xa672) (BuildId: 69b3a74d7af87f05c5edb71935a43b024a0fe968)
    #1 FreeChannel CCID/src/ifdhandler.c:92:2 (libccid.so+0xa672)
    #2 IFDHCloseChannel CCID/src/ifdhandler.c:302:2 (libccid.so+0xa672)
    #3 IFDCloseIFD PCSC/src/ifdwrapper.c:190:7 (pcscd+0xd9e30) (BuildId: 046d0874ce19c882d4f3b8ab5213aa4cd336cd5e)
    #4 RFUnInitializeReader PCSC/src/readerfactory.c:1153:9 (pcscd+0xd9e30)
    #5 removeReader PCSC/src/readerfactory.c:645:2 (pcscd+0xd9e30)
    #6 _UnrefReader PCSC/src/readerfactory.c:120:3 (pcscd+0xd9e30)
    #7 IFDCloseIFD PCSC/src/ifdwrapper.c:190:7 (pcscd+0xd9e30) (BuildId: 046d0874ce19c882d4f3b8ab5213aa4cd336cd5e)
    #8 RFUnInitializeReader PCSC/src/readerfactory.c:1153:9 (pcscd+0xd9e30)
    #9 removeReader PCSC/src/readerfactory.c:645:2 (pcscd+0xd9e30)
    #10 _UnrefReader PCSC/src/readerfactory.c:120:3 (pcscd+0xd9e30)
    #11 RFRemoveReader PCSC/src/readerfactory.c:624:5 (pcscd+0xdd282) (BuildId: 046d0874ce19c882d4f3b8ab5213aa4cd336cd5e)
    #12 RFRemoveReader PCSC/src/readerfactory.c:624:5 (pcscd+0xdd282) (BuildId: 046d0874ce19c882d4f3b8ab5213aa4cd336cd5e)
    #13 RFRemoveReader PCSC/src/readerfactory.c:624:5 (pcscd+0xdd282) (BuildId: 046d0874ce19c882d4f3b8ab5213aa4cd336cd5e)
    #14 RFCleanupReaders PCSC/src/readerfactory.c:1396:9 (pcscd+0xddb9e) (BuildId: 046d0874ce19c882d4f3b8ab5213aa4cd336cd5e)
    #15 SVCServiceRunLoop PCSC/src/pcscdaemon.c:123:4 (pcscd+0xd9574) (BuildId: 046d0874ce19c882d4f3b8ab5213aa4cd336cd5e)
    #16 main PCSC/src/pcscdaemon.c:801:2 (pcscd+0xd8810) (BuildId: 046d0874ce19c882d4f3b8ab5213aa4cd336cd5e)

  Previous read of size 4 at 0x7fd1b32be970 by thread T7:
    #0 LunToReaderIndex CCID/src/utils.c:72:14 (libccid.so+0xf8aa) (BuildId: 69b3a74d7af87f05c5edb71935a43b024a0fe968)
    #1 IFDHPolling CCID/src/ifdhandler.c:313:28 (libccid.so+0xb1bf) (BuildId: 69b3a74d7af87f05c5edb71935a43b024a0fe968)
    #2 EHStatusHandlerThread PCSC/src/eventhandler.c:467:10 (pcscd+0xd6f9b) (BuildId: 046d0874ce19c882d4f3b8ab5213aa4cd336cd5e)

  As if synchronized via sleep:
    #0 nanosleep <null> (pcscd+0x515ed) (BuildId: 046d0874ce19c882d4f3b8ab5213aa4cd336cd5e)
    #1 SYS_Sleep PCSC/src/sys_unix.c:69:9 (pcscd+0xdfbf9) (BuildId: 046d0874ce19c882d4f3b8ab5213aa4cd336cd5e)
    #2 SVCServiceRunLoop PCSC/src/pcscdaemon.c:117:10 (pcscd+0xd956a) (BuildId: 046d0874ce19c882d4f3b8ab5213aa4cd336cd5e)
    #3 main PCSC/src/pcscdaemon.c:801:2 (pcscd+0xd8810) (BuildId: 046d0874ce19c882d4f3b8ab5213aa4cd336cd5e)

  Location is global 'ReaderIndex' of size 64 at 0x7fd1b32be970 (libccid.so+0x22970)

  Mutex M0 (0x7b0c00000ed0) created at:
    #0 pthread_mutex_init <null> (pcscd+0x555cf) (BuildId: 046d0874ce19c882d4f3b8ab5213aa4cd336cd5e)
    #1 RFAddReader PCSC/src/readerfactory.c:355:9 (pcscd+0xdb4b7) (BuildId: 046d0874ce19c882d4f3b8ab5213aa4cd336cd5e)
    #2 HPAddDevice PCSC/src/hotplug_libudev.c:512:8 (pcscd+0xe3409) (BuildId: 046d0874ce19c882d4f3b8ab5213aa4cd336cd5e)
    #3 HPScanUSB PCSC/src/hotplug_libudev.c:579:3 (pcscd+0xe2a1d) (BuildId: 046d0874ce19c882d4f3b8ab5213aa4cd336cd5e)
    #4 HPRegisterForHotplugEvents PCSC/src/hotplug_libudev.c:761:2 (pcscd+0xe2a1d)
    #5 main PCSC/src/pcscdaemon.c:768:7 (pcscd+0xd8717) (BuildId: 046d0874ce19c882d4f3b8ab5213aa4cd336cd5e)

  Mutex M1 (0x7fd1b32be948) created at:
    #0 pthread_mutex_lock <null> (pcscd+0x71ada) (BuildId: 046d0874ce19c882d4f3b8ab5213aa4cd336cd5e)
    #1 CreateChannelByNameOrChannel CCID/src/ifdhandler.c:119:8 (libccid.so+0x82ae) (BuildId: 69b3a74d7af87f05c5edb71935a43b024a0fe968)
    #2 IFDHCreateChannelByName CCID/src/ifdhandler.c:233:9 (libccid.so+0x7e55) (BuildId: 69b3a74d7af87f05c5edb71935a43b024a0fe968)
    #3 IFDOpenIFD PCSC/src/ifdwrapper.c:136:9 (pcscd+0xdd0cb) (BuildId: 046d0874ce19c882d4f3b8ab5213aa4cd336cd5e)
    #4 RFInitializeReader PCSC/src/readerfactory.c:1121:8 (pcscd+0xdd0cb)
    #5 RFAddReader PCSC/src/readerfactory.c:366:7 (pcscd+0xdb52a) (BuildId: 046d0874ce19c882d4f3b8ab5213aa4cd336cd5e)
    #6 RFAddReader PCSC/src/readerfactory.c:366:7 (pcscd+0xdb52a) (BuildId: 046d0874ce19c882d4f3b8ab5213aa4cd336cd5e)
    #7 HPAddDevice PCSC/src/hotplug_libudev.c:512:8 (pcscd+0xe3409) (BuildId: 046d0874ce19c882d4f3b8ab5213aa4cd336cd5e)
    #8 HPScanUSB PCSC/src/hotplug_libudev.c:579:3 (pcscd+0xe2a1d) (BuildId: 046d0874ce19c882d4f3b8ab5213aa4cd336cd5e)
    #9 HPRegisterForHotplugEvents PCSC/src/hotplug_libudev.c:761:2 (pcscd+0xe2a1d)
    #10 main PCSC/src/pcscdaemon.c:768:7 (pcscd+0xd8717) (BuildId: 046d0874ce19c882d4f3b8ab5213aa4cd336cd5e)

  Thread T7 (tid=4049, running) created by thread T4 at:
    #0 pthread_create <null> (pcscd+0x53dfd) (BuildId: 046d0874ce19c882d4f3b8ab5213aa4cd336cd5e)
    #1 ThreadCreate PCSC/src/utils.c:184:8 (pcscd+0xe3cab) (BuildId: 046d0874ce19c882d4f3b8ab5213aa4cd336cd5e)
    #2 EHSpawnEventHandler PCSC/src/eventhandler.c:233:7 (pcscd+0xd6840) (BuildId: 046d0874ce19c882d4f3b8ab5213aa4cd336cd5e)
    #3 RFAddReader PCSC/src/readerfactory.c:397:8 (pcscd+0xdb6ba) (BuildId: 046d0874ce19c882d4f3b8ab5213aa4cd336cd5e)
    #4 HPAddDevice PCSC/src/hotplug_libudev.c:512:8 (pcscd+0xe3409) (BuildId: 046d0874ce19c882d4f3b8ab5213aa4cd336cd5e)
    #5 HPEstablishUSBNotifications PCSC/src/hotplug_libudev.c:646:6 (pcscd+0xe3783) (BuildId: 046d0874ce19c882d4f3b8ab5213aa4cd336cd5e)

SUMMARY: ThreadSanitizer: data race CCID/src/utils.c:81:21 in ReleaseReaderIndex
==================
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@martinpaljak @LudovicRousseau