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perf/core: Fix MMAP event path names with backing files

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commit 8818f507a9 upstream.

Some file systems like FUSE-based ones or overlayfs may record the backing
file in struct vm_area_struct vm_file, instead of the user file that the
user mmapped.

Since commit def3ae83da ("fs: store real path instead of fake path in
backing file f_path"), file_path() no longer returns the user file path
when applied to a backing file.  There is an existing helper
file_user_path() for that situation.

Use file_user_path() instead of file_path() to get the path for MMAP
and MMAP2 events.

Example:

  Setup:

    # cd /root
    # mkdir test ; cd test ; mkdir lower upper work merged
    # cp `which cat` lower
    # mount -t overlay overlay -olowerdir=lower,upperdir=upper,workdir=work merged
    # perf record -e intel_pt//u -- /root/test/merged/cat /proc/self/maps
    ...
    55b0ba399000-55b0ba434000 r-xp 00018000 00:1a 3419                       /root/test/merged/cat
    ...
    [ perf record: Woken up 1 times to write data ]
    [ perf record: Captured and wrote 0.060 MB perf.data ]
    #

  Before:

    File name is wrong (/cat), so decoding fails:

    # perf script --no-itrace --show-mmap-events
             cat     367 [016]   100.491492: PERF_RECORD_MMAP2 367/367: [0x55b0ba399000(0x9b000) @ 0x18000 00:02 3419 489959280]: r-xp /cat
    ...
    # perf script --itrace=e | wc -l
    Warning:
    19 instruction trace errors
    19
    #

  After:

    File name is correct (/root/test/merged/cat), so decoding is ok:

    # perf script --no-itrace --show-mmap-events
                 cat     364 [016]    72.153006: PERF_RECORD_MMAP2 364/364: [0x55ce4003d000(0x9b000) @ 0x18000 00:02 3419 3132534314]: r-xp /root/test/merged/cat
    # perf script --itrace=e
    # perf script --itrace=e | wc -l
    0
    #

Fixes: def3ae83da ("fs: store real path instead of fake path in backing file f_path")
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Amir Goldstein <amir73il@gmail.com>
Cc: stable@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Adrian Hunter
2025-10-13 10:22:43 +03:00
committed by Greg Kroah-Hartman
parent 6ddc602b1c
commit 7024b11fb4
1 changed files with 1 additions and 1 deletions
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2
kernel/events/core.c
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@@ -9010,7 +9010,7 @@ static void perf_event_mmap_event(struct perf_mmap_event *mmap_event)
* need to add enough zero bytes after the string to handle * need to add enough zero bytes after the string to handle
* the 64bit alignment we do later. * the 64bit alignment we do later.
*/ */
name = file_path(file, buf, PATH_MAX - sizeof(u64)); name = d_path(file_user_path(file), buf, PATH_MAX - sizeof(u64));
if (IS_ERR(name)) { if (IS_ERR(name)) {
name = "//toolong"; name = "//toolong";
goto cpy_name; goto cpy_name;