Eric Lee / smarc-fsl-linux-kernel

16 Apr, 2020

1 commit

  • 6b3e0e2e0   perf tools: Support CAP_PERFMON capability ... Browse Code »

    Extend error messages to mention CAP_PERFMON capability as an option to
    substitute CAP_SYS_ADMIN capability for secure system performance
    monitoring and observability operations. Make
    perf_event_paranoid_check() and __cmd_ftrace() to be aware of
    CAP_PERFMON capability.

    CAP_PERFMON implements the principle of least privilege for performance
    monitoring and observability operations (POSIX IEEE 1003.1e 2.2.2.39
    principle of least privilege: A security design principle that states
    that a process or program be granted only those privileges (e.g.,
    capabilities) necessary to accomplish its legitimate function, and only
    for the time that such privileges are actually required)

    For backward compatibility reasons access to perf_events subsystem remains
    open for CAP_SYS_ADMIN privileged processes but CAP_SYS_ADMIN usage for
    secure perf_events monitoring is discouraged with respect to CAP_PERFMON
    capability.

    Committer testing:

    Using a libcap with this patch:

    diff --git a/libcap/include/uapi/linux/capability.h b/libcap/include/uapi/linux/capability.h
    index 78b2fd4c8a95..89b5b0279b60 100644
    --- a/libcap/include/uapi/linux/capability.h
    +++ b/libcap/include/uapi/linux/capability.h
    @@ -366,8 +366,9 @@ struct vfs_ns_cap_data {

    #define CAP_AUDIT_READ 37

    +#define CAP_PERFMON 38

    -#define CAP_LAST_CAP CAP_AUDIT_READ
    +#define CAP_LAST_CAP CAP_PERFMON

    #define cap_valid(x) ((x) >= 0 && (x)
    Reviewed-by: James Morris
    Acked-by: Jiri Olsa
    Acked-by: Namhyung Kim
    Tested-by: Arnaldo Carvalho de Melo
    Cc: Alexei Starovoitov
    Cc: Andi Kleen
    Cc: Igor Lubashev
    Cc: Peter Zijlstra
    Cc: Serge Hallyn
    Cc: Song Liu
    Cc: Stephane Eranian
    Cc: Thomas Gleixner
    Cc: intel-gfx@lists.freedesktop.org
    Cc: linux-doc@vger.kernel.org
    Cc: linux-man@vger.kernel.org
    Cc: linux-security-module@vger.kernel.org
    Cc: selinux@vger.kernel.org
    Link: http://lore.kernel.org/lkml/a66d5648-2b8e-577e-e1f2-1d56c017ab5e@linux.intel.com
    Signed-off-by: Arnaldo Carvalho de Melo

    Alexey Budankov
     

21 Jan, 2019

1 commit

  • 23e232bd9   perf/doc: Update design.txt for exclude_{host|guest} flags ... Browse Code »

    Update design.txt to reflect the presence of the exclude_host
    and exclude_guest perf flags.

    Signed-off-by: Andrew Murray
    Signed-off-by: Peter Zijlstra (Intel)
    Cc: Arnaldo Carvalho de Melo
    Cc: Benjamin Herrenschmidt
    Cc: Borislav Petkov
    Cc: Ivan Kokshaysky
    Cc: Linus Torvalds
    Cc: Mark Rutland
    Cc: Matt Turner
    Cc: Michael Ellerman
    Cc: Paul Mackerras
    Cc: Peter Zijlstra
    Cc: Richard Henderson
    Cc: Russell King
    Cc: Sascha Hauer
    Cc: Shawn Guo
    Cc: Thomas Gleixner
    Cc: Will Deacon
    Cc: linux-arm-kernel@lists.infradead.org
    Cc: linuxppc-dev@lists.ozlabs.org
    Cc: robin.murphy@arm.com
    Cc: suzuki.poulose@arm.com
    Link: https://lkml.kernel.org/r/1547128414-50693-2-git-send-email-andrew.murray@arm.com
    Signed-off-by: Ingo Molnar

    Andrew Murray
     

19 Mar, 2014

1 commit

  • b68eebd1c   perf tools: Update some code references in design.txt ... Browse Code »

    Update the names of some functions and enums in design.txt. The document
    still has some stale information, but the motivation behind this patch
    is to allow a developer to quickly grep and learn about the associated
    structures.

    Signed-off-by: Ramkumar Ramachandra
    Cc: David Ahern
    Cc: Jiri Olsa
    Link: http://lkml.kernel.org/r/1395169804-1293-1-git-send-email-artagnon@gmail.com
    Signed-off-by: Arnaldo Carvalho de Melo

    Ramkumar Ramachandra
     

26 Jan, 2014

1 commit

31 May, 2012

1 commit

14 Jan, 2010

1 commit

28 Dec, 2009

1 commit

  • 0b413e44d   perf: Rename perf_event_hw_event in design document ... Browse Code »

    perf_event_hw_event has been renamed to perf_event_attr. The
    design document was still using the old name, though.

    Signed-off-by: Tim Blechmann
    Cc: Peter Zijlstra
    Cc: Mike Galbraith
    Cc: Paul Mackerras
    Cc: Arnaldo Carvalho de Melo
    Cc: Frederic Weisbecker
    LKML-Reference:
    Signed-off-by: Ingo Molnar

    Tim Blechmann
     

28 Oct, 2009

1 commit

06 Oct, 2009

1 commit

  • 906010b21   perf_event: Provide vmalloc() based mmap() backing ... Browse Code »

    Some architectures such as Sparc, ARM and MIPS (basically
    everything with flush_dcache_page()) need to deal with dcache
    aliases by carefully placing pages in both kernel and user maps.

    These architectures typically have to use vmalloc_user() for this.

    However, on other architectures, vmalloc() is not needed and has
    the downsides of being more restricted and slower than regular
    allocations.

    Signed-off-by: Peter Zijlstra
    Acked-by: David Miller
    Cc: Andrew Morton
    Cc: Jens Axboe
    Cc: Paul Mackerras
    LKML-Reference:
    Signed-off-by: Ingo Molnar

    Peter Zijlstra
     

21 Sep, 2009

1 commit

  • cdd6c482c   perf: Do the big rename: Performance Counters -> Performance Events ... Browse Code »

    Bye-bye Performance Counters, welcome Performance Events!

    In the past few months the perfcounters subsystem has grown out its
    initial role of counting hardware events, and has become (and is
    becoming) a much broader generic event enumeration, reporting, logging,
    monitoring, analysis facility.

    Naming its core object 'perf_counter' and naming the subsystem
    'perfcounters' has become more and more of a misnomer. With pending
    code like hw-breakpoints support the 'counter' name is less and
    less appropriate.

    All in one, we've decided to rename the subsystem to 'performance
    events' and to propagate this rename through all fields, variables
    and API names. (in an ABI compatible fashion)

    The word 'event' is also a bit shorter than 'counter' - which makes
    it slightly more convenient to write/handle as well.

    Thanks goes to Stephane Eranian who first observed this misnomer and
    suggested a rename.

    User-space tooling and ABI compatibility is not affected - this patch
    should be function-invariant. (Also, defconfigs were not touched to
    keep the size down.)

    This patch has been generated via the following script:

    FILES=$(find * -type f | grep -vE 'oprofile|[^K]config')

    sed -i \
    -e 's/PERF_EVENT_/PERF_RECORD_/g' \
    -e 's/PERF_COUNTER/PERF_EVENT/g' \
    -e 's/perf_counter/perf_event/g' \
    -e 's/nb_counters/nb_events/g' \
    -e 's/swcounter/swevent/g' \
    -e 's/tpcounter_event/tp_event/g' \
    $FILES

    for N in $(find . -name perf_counter.[ch]); do
    M=$(echo $N | sed 's/perf_counter/perf_event/g')
    mv $N $M
    done

    FILES=$(find . -name perf_event.*)

    sed -i \
    -e 's/COUNTER_MASK/REG_MASK/g' \
    -e 's/COUNTER/EVENT/g' \
    -e 's/\/event_id/g' \
    -e 's/counter/event/g' \
    -e 's/Counter/Event/g' \
    $FILES

    ... to keep it as correct as possible. This script can also be
    used by anyone who has pending perfcounters patches - it converts
    a Linux kernel tree over to the new naming. We tried to time this
    change to the point in time where the amount of pending patches
    is the smallest: the end of the merge window.

    Namespace clashes were fixed up in a preparatory patch - and some
    stylistic fallout will be fixed up in a subsequent patch.

    ( NOTE: 'counters' are still the proper terminology when we deal
    with hardware registers - and these sed scripts are a bit
    over-eager in renaming them. I've undone some of that, but
    in case there's something left where 'counter' would be
    better than 'event' we can undo that on an individual basis
    instead of touching an otherwise nicely automated patch. )

    Suggested-by: Stephane Eranian
    Acked-by: Peter Zijlstra
    Acked-by: Paul Mackerras
    Reviewed-by: Arjan van de Ven
    Cc: Mike Galbraith
    Cc: Arnaldo Carvalho de Melo
    Cc: Frederic Weisbecker
    Cc: Steven Rostedt
    Cc: Benjamin Herrenschmidt
    Cc: David Howells
    Cc: Kyle McMartin
    Cc: Martin Schwidefsky
    Cc: "David S. Miller"
    Cc: Thomas Gleixner
    Cc: "H. Peter Anvin"
    Cc:
    LKML-Reference:
    Signed-off-by: Ingo Molnar

    Ingo Molnar
     

13 Jun, 2009

1 commit

11 Jun, 2009

1 commit

07 Jun, 2009

1 commit