On Sat, Jun 22, 2019 at 03:06:07PM +0200, Rafa wrote:
> >Synopsis: Permission denied from ls [mountpoint]/.. when mountpoint have
> >no permissions before mount(8)
> >Category: library
> >Environment:
> System : OpenBSD 6.5
> Details : OpenBSD 6.5 (GENERIC.MP) #1: Mon May 27 18:27:59 CEST 2019
>
> [email protected]:/usr/src/sys/arch/amd64/compile/GENERIC.MP
>
> Architecture: OpenBSD.amd64
> Machine : amd64
> >Description:
> In this machine /usr/src is a mount point without any permission. I
> mount a filesystem at
> directory /usr/src. The mounted filesystem do have permissions to the
> mount point directory
> for my user through group wsrc.
> However, "ls /usr/src/.." returns the message "Permission denied"
> instead of listing the
> contents of /usr, as I would expect.
See the man mount page CAVEAT.
-Otto
>
> >How-To-Repeat:
> In this machine every user has read and search access to /usr, and
> /usr/src is a mount point
> without any permission at all (before mount(8)):
>
> $ df | grep /usr/src (<- the filesystem is not mounted yet)
>
> $ ls -ld /usr
> drwxr-xr-x 18 root wheel 512 Jun 9 19:06 /usr
>
> $ ls -ld /usr/src
> d--------- 2 root wsrc 512 Jun 9 12:47 /usr/src
>
> In this scenario, I can get the listing of /usr using "ls /usr" but not
> using "/usr/src/..",
> which seems ok to me:
>
> $ id
> uid=1000(rafa) gid=1000(rafa) groups=1000(rafa), 0(wheel), 9(wsrc),
> 21(wobj)
>
> $ ls /usr
> X11R6 games lib libexec mdec ports share xenocara
> bin include libdata local obj sbin src xobj
>
> $ ls /usr/src/..
> ls: /usr/src/..: Permission denied
>
> Now I mount a filesystem at directory /usr/src. After the mount(8),
> /usr/src has the permissions
> I want it to have:
>
> $ grep /usr/src /etc/fstab
> 2ae1c772b7608e2a.f /usr/src ffs rw,wxallowed,nodev 1 2
>
> # mount -a
>
> $ df | grep /usr/src
> /dev/sd0f 7437692 2123632 4942176 30% /usr/src
>
> $ ls -ld /usr/src
> drwxrwxr-x 17 root wsrc 512 Jun 17 20:58 /usr/src
>
> With this configuration I still get a "Permission denied" message when
> trying to access "/usr/src/..",
> which I think is not correct:
>
> $ ls /usr
> X11R6 games lib libexec mdec ports share xenocara
> bin include libdata local obj sbin src xobj
>
> $ ls /usr/src/..
> ls: /usr/src/..: Permission denied
>
> However, if the mount point has permissions (let's say 550) before the
> mount(8), access to "/usr/src/.." gives
> the result I expect:
>
> # umount /usr/src
>
> $ ls -ld /usr/src
> d--------- 2 root wsrc 512 Jun 9 12:47 /usr/src
>
> # chmod ug+rx /usr/src
>
> $ ls -ld /usr/src
> dr-xr-x--- 2 root wsrc 512 Jun 9 12:47 /usr/src
>
> # mount -a
>
> $ df | grep /usr/src
> /dev/sd0f 7437692 2123632 4942176 30% /usr/src
>
> $ ls -ld /usr/src
> drwxrwxr-x 17 root wsrc 512 Jun 17 20:58 /usr/src
>
> $ ls /usr/src/..
> X11R6 games lib libexec mdec ports share xenocara
> bin include libdata local obj sbin src xobj
>
> >Fix:
> I have followed the execution flow up to the FTSENT * fts_children(FTS
> *sp, int instr) function in
> /usr/src/lib/libc/gen/fts.c but, unfortunately, I am not skilled enough
> to go any further.
>
>
> dmesg:
> OpenBSD 6.5 (GENERIC.MP) #1: Mon May 27 18:27:59 CEST 2019
>
> [email protected]:/usr/src/sys/arch/amd64/compile/GENERIC.MP
> real mem = 8488615936 (8095MB)
> avail mem = 8221712384 (7840MB)
> mpath0 at root
> scsibus0 at mpath0: 256 targets
> mainbus0 at root
> bios0 at mainbus0: SMBIOS rev. 3.0 @ 0x8d313000 (41 entries)
> bios0: vendor American Megatrends Inc. version "5.12" date 02/17/2017
> bios0: Notebook N24_25BU
> acpi0 at bios0: rev 2
> acpi0: sleep states S0 S3 S4 S5
> acpi0: tables DSDT FACP APIC FPDT MCFG SSDT FIDT SSDT HPET SSDT UEFI SSDT
> LPIT WSMT SSDT SSDT DBGP DBG2 BGRT DMAR TPM2 ASF!
> acpi0: wakeup devices PXSX(S4) RP21(S4) PXSX(S4) RP22(S4) PXSX(S4) RP23(S4)
> PXSX(S4) RP24(S4) PXSX(S4) RP17(S4) PXSX(S4) RP18(S4) PXSX(S4) RP19(S4)
> PXSX(S4) RP20(S4) [...]
> acpitimer0 at acpi0: 3579545 Hz, 24 bits
> acpimadt0 at acpi0 addr 0xfee00000: PC-AT compat
> cpu0 at mainbus0: apid 0 (boot processor)
> cpu0: Intel(R) Core(TM) i5-7200U CPU @ 2.50GHz, 2176.88 MHz, 06-8e-09
> cpu0:
> FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE,SSE3,PCLMUL,DTES64,MWAIT,DS-CPL,VMX,EST,TM2,SSSE3,SDBG,FMA3,CX16,xTPR,PDCM,PCID,SSE4.1,SSE4.2,x2APIC,MOVBE,POPCNT,DEADLINE,AES,XSAVE,AVX,F16C,RDRAND,NXE,PAGE1GB,RDTSCP,LONG,LAHF,ABM,3DNOWP,PERF,ITSC,FSGSBASE,SGX,BMI1,AVX2,SMEP,BMI2,ERMS,INVPCID,MPX,RDSEED,ADX,SMAP,CLFLUSHOPT,PT,SENSOR,ARAT,XSAVEOPT,XSAVEC,XGETBV1,XSAVES,MELTDOWN
> cpu0: 256KB 64b/line 8-way L2 cache
> cpu0: smt 0, core 0, package 0
> mtrr: Pentium Pro MTRR support, 10 var ranges, 88 fixed ranges
> cpu0: apic clock running at 23MHz
> cpu0: mwait min=64, max=64, C-substates=0.2.1.2.4.1.1.1, IBE
> cpu1 at mainbus0: apid 2 (application processor)
> cpu1: Intel(R) Core(TM) i5-7200U CPU @ 2.50GHz, 2394.39 MHz, 06-8e-09
> cpu1:
> FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE,SSE3,PCLMUL,DTES64,MWAIT,DS-CPL,VMX,EST,TM2,SSSE3,SDBG,FMA3,CX16,xTPR,PDCM,PCID,SSE4.1,SSE4.2,x2APIC,MOVBE,POPCNT,DEADLINE,AES,XSAVE,AVX,F16C,RDRAND,NXE,PAGE1GB,RDTSCP,LONG,LAHF,ABM,3DNOWP,PERF,ITSC,FSGSBASE,SGX,BMI1,AVX2,SMEP,BMI2,ERMS,INVPCID,MPX,RDSEED,ADX,SMAP,CLFLUSHOPT,PT,SENSOR,ARAT,XSAVEOPT,XSAVEC,XGETBV1,XSAVES,MELTDOWN
> cpu1: 256KB 64b/line 8-way L2 cache
> cpu1: smt 0, core 1, package 0
> cpu2 at mainbus0: apid 1 (application processor)
> cpu2: Intel(R) Core(TM) i5-7200U CPU @ 2.50GHz, 2394.39 MHz, 06-8e-09
> cpu2:
> FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE,SSE3,PCLMUL,DTES64,MWAIT,DS-CPL,VMX,EST,TM2,SSSE3,SDBG,FMA3,CX16,xTPR,PDCM,PCID,SSE4.1,SSE4.2,x2APIC,MOVBE,POPCNT,DEADLINE,AES,XSAVE,AVX,F16C,RDRAND,NXE,PAGE1GB,RDTSCP,LONG,LAHF,ABM,3DNOWP,PERF,ITSC,FSGSBASE,SGX,BMI1,AVX2,SMEP,BMI2,ERMS,INVPCID,MPX,RDSEED,ADX,SMAP,CLFLUSHOPT,PT,SENSOR,ARAT,XSAVEOPT,XSAVEC,XGETBV1,XSAVES,MELTDOWN
> cpu2: 256KB 64b/line 8-way L2 cache
> cpu2: smt 1, core 0, package 0
> cpu3 at mainbus0: apid 3 (application processor)
> cpu3: Intel(R) Core(TM) i5-7200U CPU @ 2.50GHz, 2394.39 MHz, 06-8e-09
> cpu3:
> FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE,SSE3,PCLMUL,DTES64,MWAIT,DS-CPL,VMX,EST,TM2,SSSE3,SDBG,FMA3,CX16,xTPR,PDCM,PCID,SSE4.1,SSE4.2,x2APIC,MOVBE,POPCNT,DEADLINE,AES,XSAVE,AVX,F16C,RDRAND,NXE,PAGE1GB,RDTSCP,LONG,LAHF,ABM,3DNOWP,PERF,ITSC,FSGSBASE,SGX,BMI1,AVX2,SMEP,BMI2,ERMS,INVPCID,MPX,RDSEED,ADX,SMAP,CLFLUSHOPT,PT,SENSOR,ARAT,XSAVEOPT,XSAVEC,XGETBV1,XSAVES,MELTDOWN
> cpu3: 256KB 64b/line 8-way L2 cache
> cpu3: smt 1, core 1, package 0
> ioapic0 at mainbus0: apid 2 pa 0xfec00000, version 20, 120 pins
> acpimcfg0 at acpi0
> acpimcfg0: addr 0xe0000000, bus 0-255
> acpihpet0 at acpi0: 23999999 Hz
> acpiprt0 at acpi0: bus 0 (PCI0)
> acpiprt1 at acpi0: bus -1 (PEG0)
> acpiprt2 at acpi0: bus -1 (PEG1)
> acpiprt3 at acpi0: bus -1 (PEG2)
> acpiprt4 at acpi0: bus -1 (RP17)
> acpiprt5 at acpi0: bus -1 (RP18)
> acpiprt6 at acpi0: bus -1 (RP19)
> acpiprt7 at acpi0: bus -1 (RP20)
> acpiprt8 at acpi0: bus 1 (RP01)
> acpiprt9 at acpi0: bus -1 (RP02)
> acpiprt10 at acpi0: bus 2 (RP03)
> acpiprt11 at acpi0: bus -1 (RP04)
> acpiprt12 at acpi0: bus -1 (RP05)
> acpiprt13 at acpi0: bus 3 (RP06)
> acpiprt14 at acpi0: bus -1 (RP07)
> acpiprt15 at acpi0: bus -1 (RP08)
> acpiprt16 at acpi0: bus -1 (RP09)
> acpiprt17 at acpi0: bus -1 (RP10)
> acpiprt18 at acpi0: bus -1 (RP11)
> acpiprt19 at acpi0: bus -1 (RP12)
> acpiprt20 at acpi0: bus -1 (RP13)
> acpiprt21 at acpi0: bus -1 (RP14)
> acpiprt22 at acpi0: bus -1 (RP15)
> acpiprt23 at acpi0: bus -1 (RP16)
> acpiec0 at acpi0
> acpicpu0 at acpi0: C3(200@1034 mwait.1@0x60), C2(200@151 mwait.1@0x33),
> C1(1000@1 mwait.1), PSS
> acpicpu1 at acpi0: C3(200@1034 mwait.1@0x60), C2(200@151 mwait.1@0x33),
> C1(1000@1 mwait.1), PSS
> acpicpu2 at acpi0: C3(200@1034 mwait.1@0x60), C2(200@151 mwait.1@0x33),
> C1(1000@1 mwait.1), PSS
> acpicpu3 at acpi0: C3(200@1034 mwait.1@0x60), C2(200@151 mwait.1@0x33),
> C1(1000@1 mwait.1), PSS
> acpitz0 at acpi0: critical temperature is 120 degC
> acpipci0 at acpi0 PCI0: 0x00000004 0x00000011 0x00000001
> acpicmos0 at acpi0
> "INT33A1" at acpi0 not configured
> "MSFT0101" at acpi0 not configured
> "PNPC000" at acpi0 not configured
> acpibtn0 at acpi0: PWRB
> acpibtn1 at acpi0: SLPB
> acpibtn2 at acpi0: LID0
> acpiac0 at acpi0: AC unit offline
> acpibat0 at acpi0: BAT0 model "BAT" serial 0001 type LION oem "Notebook"
> "PNP0C14" at acpi0 not configured
> acpivideo0 at acpi0: GFX0
> acpivout0 at acpivideo0: DD1F
> cpu0: using Skylake AVX MDS workaround
> cpu0: Enhanced SpeedStep 2176 MHz: speeds: 2601, 2600, 2500, 2400, 2200,
> 2000, 1900, 1700, 1500, 1400, 1200, 1100, 800, 700, 600, 400 MHz
> pci0 at mainbus0 bus 0
> pchb0 at pci0 dev 0 function 0 "Intel Core 7G Host" rev 0x02
> inteldrm0 at pci0 dev 2 function 0 "Intel HD Graphics 620" rev 0x02
> drm0 at inteldrm0
> inteldrm0: msi
> error: [drm:pid0:i915_firmware_load_error_print] *ERROR* failed to load
> firmware i915/kbl_dmc_ver1.bin (-22)
> inteldrm0: 1920x1080, 32bpp
> wsdisplay0 at inteldrm0 mux 1: console (std, vt100 emulation)
> wsdisplay0: screen 1-5 added (std, vt100 emulation)
> "Intel Core GMM" rev 0x00 at pci0 dev 8 function 0 not configured
> xhci0 at pci0 dev 20 function 0 "Intel 100 Series xHCI" rev 0x21: msi, xHCI
> 1.0
> usb0 at xhci0: USB revision 3.0
> uhub0 at usb0 configuration 1 interface 0 "Intel xHCI root hub" rev 3.00/1.00
> addr 1
> pchtemp0 at pci0 dev 20 function 2 "Intel 100 Series Thermal" rev 0x21
> "Intel 100 Series MEI" rev 0x21 at pci0 dev 22 function 0 not configured
> ahci0 at pci0 dev 23 function 0 "Intel 100 Series AHCI" rev 0x21: msi, AHCI
> 1.3.1
> ahci0: PHY offline on port 0
> ahci0: port 2: 6.0Gb/s
> scsibus1 at ahci0: 32 targets
> sd0 at scsibus1 targ 2 lun 0: <ATA, WDC WDS240G1G0B-, Z331> SCSI3 0/direct
> fixed naa.5001b448b4de6980
> sd0: 228936MB, 512 bytes/sector, 468862128 sectors, thin
> ppb0 at pci0 dev 28 function 0 "Intel 100 Series PCIE" rev 0xf1: msi
> pci1 at ppb0 bus 1
> xhci1 at pci1 dev 0 function 0 "ASMedia ASM1042AE xHCI" rev 0x00: msi, xHCI
> 1.10
> usb1 at xhci1: USB revision 3.0
> uhub1 at usb1 configuration 1 interface 0 "ASMedia xHCI root hub" rev
> 3.00/1.00 addr 1
> ppb1 at pci0 dev 28 function 2 "Intel 100 Series PCIE" rev 0xf1: msi
> pci2 at ppb1 bus 2
> iwm0 at pci2 dev 0 function 0 "Intel Dual Band Wireless-AC 8265" rev 0x78, msi
> ppb2 at pci0 dev 28 function 5 "Intel 100 Series PCIE" rev 0xf1: msi
> pci3 at ppb2 bus 3
> rtsx0 at pci3 dev 0 function 0 "Realtek RTL8411B Card Reader" rev 0x01: msi
> sdmmc0 at rtsx0: 4-bit, dma
> re0 at pci3 dev 0 function 1 "Realtek 8168" rev 0x12: RTL8411B (0x5c80), msi,
> address 80:fa:5b:43:62:91
> rgephy0 at re0 phy 7: RTL8251 PHY, rev. 0
> pcib0 at pci0 dev 31 function 0 "Intel 200 Series LPC" rev 0x21
> "Intel 100 Series PMC" rev 0x21 at pci0 dev 31 function 2 not configured
> azalia0 at pci0 dev 31 function 3 "Intel 200 Series HD Audio" rev 0x21: msi
> azalia0: codecs: Realtek ALC269, Intel/0x280b, using Realtek ALC269
> audio0 at azalia0
> ichiic0 at pci0 dev 31 function 4 "Intel 100 Series SMBus" rev 0x21: apic 2
> int 16
> iic0 at ichiic0
> iic0: addr 0x2c 80=04 81=04 82=04 83=04 84=04 85=04 86=04 87=04 fd=01 words
> 00=ffff 01=ffff 02=ffff 03=ffff 04=ffff 05=ffff 06=ffff 07=ffff
> isa0 at pcib0
> isadma0 at isa0
> pckbc0 at isa0 port 0x60/5 irq 1 irq 12
> pckbd0 at pckbc0 (kbd slot)
> wskbd0 at pckbd0: console keyboard, using wsdisplay0
> pms0 at pckbc0 (aux slot)
> wsmouse0 at pms0 mux 0
> pms0: Synaptics touchpad, firmware 8.2, 0x1e2b1 0x840300
> pcppi0 at isa0 port 0x61
> spkr0 at pcppi0
> vmm0 at mainbus0: VMX/EPT (using slow L1TF mitigation)
> efifb at mainbus0 not configured
> ugen0 at uhub0 port 5 "Intel Bluetooth" rev 2.00/0.10 addr 2
> uvideo0 at uhub0 port 6 configuration 1 interface 0 "Chicony Electronics
> Co.,Ltd. Chicony USB2.0 Camera" rev 2.00/10.19 addr 3
> video0 at uvideo0
> vscsi0 at root
> scsibus2 at vscsi0: 256 targets
> softraid0 at root
> scsibus3 at softraid0: 256 targets
> root on sd0a (2ae1c772b7608e2a.a) swap on sd0b dump on sd0b
> iwm0: hw rev 0x230, fw ver 22.361476.0, address 00:28:f8:73:b3:3d
>
> usbdevs:
> Controller /dev/usb0:
> addr 01: 8086:0000 Intel, xHCI root hub
> super speed, self powered, config 1, rev 1.00
> driver: uhub0
> addr 02: 8087:0a2b Intel, Bluetooth
> full speed, self powered, config 1, rev 0.10
> driver: ugen0
> addr 03: 04f2:b59e Chicony Electronics Co.,Ltd., Chicony USB2.0 Camera
> high speed, power 500 mA, config 1, rev 10.19, iSerial 200901010001
> driver: uvideo0
> Controller /dev/usb1:
> addr 01: 1b21:0000 ASMedia, xHCI root hub
> super speed, self powered, config 1, rev 1.00
> driver: uhub1
>
