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| author | Jialin Wang <wjl.linux@gmail.com> | 2025-08-08 00:54:55 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-11-24 10:36:08 +0100 |
| commit | 01c7a6e25b9d1b70012b755400b3805bcbb1068d (patch) | |
| tree | 8aa7d227beacbc210d661e57586915c0f5948e49 /include/net/aligned_data.h | |
| parent | 2dbb5e9d489c60521394cebc698f12a0736840c4 (diff) | |
proc: proc_maps_open allow proc_mem_open to return NULL
commit c0e1b774f68bdbea1618e356e30672c7f1e32509 upstream.
The commit 65c66047259f ("proc: fix the issue of proc_mem_open returning
NULL") caused proc_maps_open() to return -ESRCH when proc_mem_open()
returns NULL. This breaks legitimate /proc/<pid>/maps access for kernel
threads since kernel threads have NULL mm_struct.
The regression causes perf to fail and exit when profiling a kernel
thread:
# perf record -v -g -p $(pgrep kswapd0)
...
couldn't open /proc/65/task/65/maps
This patch partially reverts the commit to fix it.
Link: https://lkml.kernel.org/r/20250807165455.73656-1-wjl.linux@gmail.com
Fixes: 65c66047259f ("proc: fix the issue of proc_mem_open returning NULL")
Signed-off-by: Jialin Wang <wjl.linux@gmail.com>
Cc: Penglei Jiang <superman.xpt@gmail.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include/net/aligned_data.h')
0 files changed, 0 insertions, 0 deletions