linux

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John David Anglin 91428ca932 parisc: Check region is readable by user in raw_copy_from_user()

Because of the way the _PAGE_READ is handled in the parisc PTE, an
access interruption is not generated when the kernel reads from a
region where the _PAGE_READ is zero. The current code was written
assuming read access faults would also occur in the kernel.

This change adds user access checks to raw_copy_from_user().  The
prober_user() define checks whether user code has read access to
a virtual address. Note that page faults are not handled in the
exception support for the probe instruction. For this reason, we
precede the probe by a ldb access check.

Signed-off-by: John David Anglin <dave.anglin@bell.net>
Signed-off-by: Helge Deller <deller@gmx.de>
Cc: stable@vger.kernel.org # v5.12+

2025-07-25 22:45:23 +02:00

bitops.c

parisc: add u16 support to cmpxchg()

2024-04-09 22:06:00 -07:00

checksum.c

net: checksum: Move from32to16() to generic header

2024-10-30 15:29:59 +01:00

delay.c

parisc: remove duplicate includes

2017-12-17 21:06:25 +01:00

io.c

parisc: Remove memcpy_fromio