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Code Issues Releases Activity

linuxulator: handle V3 capget/capset

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Linux 2.6.26 introduced 64-bit capability sets.  Extend our stub
implementation to handle both 32- and 64-bit.  (We still report no
capabilities in capget, and disallow any in capset.)

Reviewed by:	chuck
Sponsored by:	Turing Robotic Industries Inc.
Differential Revision:	https://reviews.freebsd.org/D15887
This commit is contained in:
Ed Maste 2018-06-19 21:26:23 +00:00
parent 01cebb69be
commit aec1e6d390
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=335387
1 changed files with 49 additions and 28 deletions
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77
sys/compat/linux/linux_misc.c
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@ -1867,7 +1867,9 @@ linux_exit_group(struct thread *td, struct linux_exit_group_args *args)
/* NOTREACHED */
}
#define _LINUX_CAPABILITY_VERSION 0x19980330
#define _LINUX_CAPABILITY_VERSION_1 0x19980330
#define _LINUX_CAPABILITY_VERSION_2 0x20071026
#define _LINUX_CAPABILITY_VERSION_3 0x20080522
struct l_user_cap_header {
l_int version;
@ -1881,27 +1883,35 @@ struct l_user_cap_data {
};
int
linux_capget(struct thread *td, struct linux_capget_args *args)
linux_capget(struct thread *td, struct linux_capget_args *uap)
{
struct l_user_cap_header luch;
struct l_user_cap_data lucd;
int error;
struct l_user_cap_data lucd[2];
int error, u32s;
if (args->hdrp == NULL)
if (uap->hdrp == NULL)
return (EFAULT);
error = copyin(args->hdrp, &luch, sizeof(luch));
error = copyin(uap->hdrp, &luch, sizeof(luch));
if (error != 0)
return (error);
if (luch.version != _LINUX_CAPABILITY_VERSION) {
switch (luch.version) {
case _LINUX_CAPABILITY_VERSION_1:
u32s = 1;
break;
case _LINUX_CAPABILITY_VERSION_2:
case _LINUX_CAPABILITY_VERSION_3:
u32s = 2;
break;
default:
#ifdef DEBUG
if (ldebug(capget))
printf(LMSG("invalid capget capability version 0x%x"),
luch.version);
#endif
luch.version = _LINUX_CAPABILITY_VERSION;
error = copyout(&luch, args->hdrp, sizeof(luch));
luch.version = _LINUX_CAPABILITY_VERSION_1;
error = copyout(&luch, uap->hdrp, sizeof(luch));
if (error)
return (error);
return (EINVAL);
@ -1910,42 +1920,50 @@ linux_capget(struct thread *td, struct linux_capget_args *args)
if (luch.pid)
return (EPERM);
if (args->datap) {
if (uap->datap) {
/*
* The current implementation doesn't support setting
* a capability (it's essentially a stub) so indicate
* that no capabilities are currently set or available
* to request.
*/
bzero (&lucd, sizeof(lucd));
error = copyout(&lucd, args->datap, sizeof(lucd));
memset(&lucd, 0, u32s * sizeof(lucd[0]));
error = copyout(&lucd, uap->datap, u32s * sizeof(lucd[0]));
}
return (error);
}
int
linux_capset(struct thread *td, struct linux_capset_args *args)
linux_capset(struct thread *td, struct linux_capset_args *uap)
{
struct l_user_cap_header luch;
struct l_user_cap_data lucd;
int error;
struct l_user_cap_data lucd[2];
int error, i, u32s;
if (args->hdrp == NULL || args->datap == NULL)
if (uap->hdrp == NULL || uap->datap == NULL)
return (EFAULT);
error = copyin(args->hdrp, &luch, sizeof(luch));
error = copyin(uap->hdrp, &luch, sizeof(luch));
if (error != 0)
return (error);
if (luch.version != _LINUX_CAPABILITY_VERSION) {
switch (luch.version) {
case _LINUX_CAPABILITY_VERSION_1:
u32s = 1;
break;
case _LINUX_CAPABILITY_VERSION_2:
case _LINUX_CAPABILITY_VERSION_3:
u32s = 2;
break;
default:
#ifdef DEBUG
if (ldebug(capset))
printf(LMSG("invalid capset capability version 0x%x"),
luch.version);
#endif
luch.version = _LINUX_CAPABILITY_VERSION;
error = copyout(&luch, args->hdrp, sizeof(luch));
luch.version = _LINUX_CAPABILITY_VERSION_1;
error = copyout(&luch, uap->hdrp, sizeof(luch));
if (error)
return (error);
return (EINVAL);
@ -1954,18 +1972,21 @@ linux_capset(struct thread *td, struct linux_capset_args *args)
if (luch.pid)
return (EPERM);
error = copyin(args->datap, &lucd, sizeof(lucd));
error = copyin(uap->datap, &lucd, u32s * sizeof(lucd[0]));
if (error != 0)
return (error);
/* We currently don't support setting any capabilities. */
if (lucd.effective || lucd.permitted || lucd.inheritable) {
linux_msg(td,
"capset effective=0x%x, permitted=0x%x, "
"inheritable=0x%x is not implemented",
(int)lucd.effective, (int)lucd.permitted,
(int)lucd.inheritable);
return (EPERM);
for (i = 0; i < u32s; i++) {
if (lucd[i].effective || lucd[i].permitted ||
lucd[i].inheritable) {
linux_msg(td,
"capset[%d] effective=0x%x, permitted=0x%x, "
"inheritable=0x%x is not implemented", i,
(int)lucd[i].effective, (int)lucd[i].permitted,
(int)lucd[i].inheritable);
return (EPERM);
}
}
return (0);