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author | Linus Torvalds <torvalds@linux-foundation.org> | 2024-12-09 10:00:25 -0800 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2024-12-09 10:00:25 -0800 |
commit | 32913f348229c9f72dda45fc2c08c6d9dfcd3d6d (patch) | |
tree | df435b6aee8d7d484c12d7004546603541ab20bd /tools/virtio/vringh_test.c | |
parent | fac04efc5c793dccbd07e2d59af9f90b7fc0dca4 (diff) |
futex: fix user access on powerpc
The powerpc user access code is special, and unlike other architectures
distinguishes between user access for reading and writing.
And commit 43a43faf5376 ("futex: improve user space accesses") messed
that up. It went undetected elsewhere, but caused ppc32 to fail early
during boot, because the user access had been started with
user_read_access_begin(), but then finished off with just a plain
"user_access_end()".
Note that the address-masking user access helpers don't even have that
read-vs-write distinction, so if powerpc ever wants to do address
masking tricks, we'll have to do some extra work for it.
[ Make sure to also do it for the EFAULT case, as pointed out by
Christophe Leroy ]
Reported-by: Andreas Schwab <schwab@linux-m68k.org>
Cc: Christophe Leroy <christophe.leroy@csgroup.eu>
Link: https://lore.kernel.org/all/87bjxl6b0i.fsf@igel.home/
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'tools/virtio/vringh_test.c')
0 files changed, 0 insertions, 0 deletions