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seccomp: switch system call argument type to void *

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The const qualifier causes problems for any code that wants to write to the
third argument of the seccomp syscall, as we will do in a future patch in
this series.

The third argument to the seccomp syscall is documented as void *, so
rather than just dropping the const, let's switch everything to use void *
as well.

I believe this is safe because of 1. the documentation above, 2. there's no
real type information exported about syscalls anywhere besides the man
pages.

Signed-off-by: Tycho Andersen <[email protected]>
CC: Kees Cook <[email protected]>
CC: Andy Lutomirski <[email protected]>
CC: Oleg Nesterov <[email protected]>
CC: Eric W. Biederman <[email protected]>
CC: "Serge E. Hallyn" <[email protected]>
Acked-by: Serge Hallyn <[email protected]>
CC: Christian Brauner <[email protected]>
CC: Tyler Hicks <[email protected]>
CC: Akihiro Suda <[email protected]>
Signed-off-by: Kees Cook <[email protected]>
This commit is contained in:
Tycho Andersen 2018-12-09 11:24:12 -07:00 • committed by Kees Cook
commit a5662e4d81
3 changed files with 6 additions and 6 deletions
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8
kernel/seccomp.c
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@ -924,7 +924,7 @@ static long seccomp_get_action_avail(const char __user *uaction)
/* Common entry point for both prctl and syscall. */
static long do_seccomp(unsigned int op, unsigned int flags,
const char __user *uargs)
void __user *uargs)
{
switch (op) {
case SECCOMP_SET_MODE_STRICT:
@ -944,7 +944,7 @@ static long do_seccomp(unsigned int op, unsigned int flags,
}
SYSCALL_DEFINE3(seccomp, unsigned int, op, unsigned int, flags,
const char __user *, uargs)
void __user *, uargs)
{
return do_seccomp(op, flags, uargs);
}
@ -956,10 +956,10 @@ SYSCALL_DEFINE3(seccomp, unsigned int, op, unsigned int, flags,
*
* Returns 0 on success or -EINVAL on failure.
*/
long prctl_set_seccomp(unsigned long seccomp_mode, char __user *filter)
long prctl_set_seccomp(unsigned long seccomp_mode, void __user *filter)
{
unsigned int op;
char __user *uargs;
void __user *uargs;
switch (seccomp_mode) {
case SECCOMP_MODE_STRICT: