sparc64: fix incorrect sign extension in sys_sparc64_personality

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commit 525fd5a94e upstream.

The value returned by sys_personality has type "long int".
It is saved to a variable of type "int", which is not a problem
yet because the type of task_struct->pesonality is "unsigned int".
The problem is the sign extension from "int" to "long int"
that happens on return from sys_sparc64_personality.

For example, a userspace call personality((unsigned) -EINVAL) will
result to any subsequent personality call, including absolutely
harmless read-only personality(0xffffffff) call, failing with
errno set to EINVAL.

Signed-off-by: Dmitry V. Levin <ldv@altlinux.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Luis Henriques <luis.henriques@canonical.com>

...

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Dmitry V. Levin 2015-12-27 02:13:27 +03:00 • committed by Luis Henriques

parent ffa534e368

commit b51db3dcd9

1 changed files with 1 additions and 1 deletions

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arch/sparc/kernel/sys_sparc_64.c

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