# git rev-parse -q --verify 311fc65c9fb9c966bca8e6f3ff8132ce57344ab9^{commit}
311fc65c9fb9c966bca8e6f3ff8132ce57344ab9
already have revision, skipping fetch
# git checkout -q -f -B kisskb 311fc65c9fb9c966bca8e6f3ff8132ce57344ab9
# git clean -qxdf
# git log -1
commit 311fc65c9fb9c966bca8e6f3ff8132ce57344ab9
Author: Eric W. Biederman <ebiederm@xmission.com>
Date:   Thu Aug 24 15:13:29 2017 -0500

    pty: Repair TIOCGPTPEER
    
    The implementation of TIOCGPTPEER has two issues.
    
    When /dev/ptmx (as opposed to /dev/pts/ptmx) is opened the wrong
    vfsmount is passed to dentry_open.  Which results in the kernel displaying
    the wrong pathname for the peer.
    
    The second is simply by caching the vfsmount and dentry of the peer it leaves
    them open, in a way they were not previously Which because of the inreased
    reference counts can cause unnecessary behaviour differences resulting in
    regressions.
    
    To fix these move the ioctl into tty_io.c at a generic level allowing
    the ioctl to have access to the struct file on which the ioctl is
    being called.  This allows the path of the slave to be derived when
    opening the slave through TIOCGPTPEER instead of requiring the path to
    the slave be cached.  Thus removing the need for caching the path.
    
    A new function devpts_ptmx_path is factored out of devpts_acquire and
    used to implement a function devpts_mntget.   The new function devpts_mntget
    takes a filp to perform the lookup on and fsi so that it can confirm
    that the superblock that is found by devpts_ptmx_path is the proper superblock.
    
    v2: Lots of fixes to make the code actually work
    v3: Suggestions by Linus
        - Removed the unnecessary initialization of filp in ptm_open_peer
        - Simplified devpts_ptmx_path as gotos are no longer required
    
    [ This is the fix for the issue that was reverted in commit
      143c97cc6529, but this time without breaking 'pbuilder' due to
      increased reference counts   - Linus ]
    
    Fixes: 54ebbfb16034 ("tty: add TIOCGPTPEER ioctl")
    Reported-by: Christian Brauner <christian.brauner@canonical.com>
    Reported-and-tested-by: Stefan Lippers-Hollmann <s.l-h@gmx.de>
    Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
    Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
# < /opt/cross/kisskb/gcc-4.6.3-nolibc/i386-linux/bin/i386-linux-gcc --version
# < git log --format=%s --max-count=1 311fc65c9fb9c966bca8e6f3ff8132ce57344ab9
# < make -j 48 ARCH=i386 O=/home/kisskb/slave/build/linus_i386-randconfig_i386 CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/i386-linux/bin/i386-linux-  randconfig
KCONFIG_SEED=0xD76524CF
warning: (X86_INTEL_LPSS && INTEL_SOC_DTS_IOSF_CORE && SND_SST_IPC_ACPI && MMC_SDHCI_ACPI) selects IOSF_MBI which has unmet direct dependencies (PCI)
# Added to kconfig CONFIG_STANDALONE=y
# Added to kconfig CONFIG_PREVENT_FIRMWARE_BUILD=y
# yes \n | make -j 48 ARCH=i386 O=/home/kisskb/slave/build/linus_i386-randconfig_i386 CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/i386-linux/bin/i386-linux-  oldconfig
yes: standard output: Broken pipe
yes: write error
# make -j 48 ARCH=i386 O=/home/kisskb/slave/build/linus_i386-randconfig_i386 CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/i386-linux/bin/i386-linux-  
make[1]: Entering directory '/home/kisskb/slave/build/linus_i386-randconfig_i386'
  GEN     ./Makefile
scripts/kconfig/conf  --silentoldconfig Kconfig
warning: (X86_INTEL_LPSS && INTEL_SOC_DTS_IOSF_CORE && SND_SST_IPC_ACPI && MMC_SDHCI_ACPI) selects IOSF_MBI which has unmet direct dependencies (PCI)
warning: (X86_INTEL_LPSS && INTEL_SOC_DTS_IOSF_CORE && SND_SST_IPC_ACPI && MMC_SDHCI_ACPI) selects IOSF_MBI which has unmet direct dependencies (PCI)
  SYSHDR  arch/x86/entry/syscalls/../../include/generated/uapi/asm/unistd_32.h
  SYSHDR  arch/x86/entry/syscalls/../../include/generated/uapi/asm/unistd_64.h
  SYSHDR  arch/x86/entry/syscalls/../../include/generated/uapi/asm/unistd_x32.h
  SYSTBL  arch/x86/entry/syscalls/../../include/generated/asm/syscalls_32.h
  HOSTCC  scripts/basic/bin2c
  CHK     include/config/kernel.release
Cannot use CONFIG_CC_STACKPROTECTOR_REGULAR: -fstack-protector available but compiler is broken
/home/kisskb/slave/src/Makefile:1092: recipe for target 'prepare-compiler-check' failed
make[1]: *** [prepare-compiler-check] Error 1
make[1]: *** Waiting for unfinished jobs....
  UPD     include/config/kernel.release
make[1]: *** wait: No child processes.  Stop.
Makefile:145: recipe for target 'sub-make' failed
make: *** [sub-make] Error 2
Command 'make -j 48 ARCH=i386 O=/home/kisskb/slave/build/linus_i386-randconfig_i386 CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/i386-linux/bin/i386-linux-  ' returned non-zero exit status 2
# rm -rf /home/kisskb/slave/build/linus_i386-randconfig_i386
# Build took: 0:00:06.214369