mm: Fix access_remote_vm() regression on tagged addresses

GDB uses /proc/PID/mem to access memory of the target process. GDB
doesn't untag addresses manually, but relies on kernel to do the right
thing.

mem_rw() of procfs uses access_remote_vm() to get data from the target
process. It worked fine until recent changes in __access_remote_vm()
that now checks if there's VMA at target address using raw address.

Untag the address before looking up the VMA.

Signed-off-by: Kirill A. Shutemov <[email protected]>
Reported-by: Christina Schimpe <[email protected]>
Fixes: eee9c708cc89 ("gup: avoid stack expansion warning for known-good case")
Cc: [email protected]
Signed-off-by: Linus Torvalds <[email protected]>

0 files changed, 0 insertions, 0 deletions