diff options
| -rw-r--r-- | ioprio.h | 57 | ||||
| -rw-r--r-- | missing.h | 12 | ||||
| -rw-r--r-- | securebits.h | 45 |
3 files changed, 114 insertions, 0 deletions
diff --git a/ioprio.h b/ioprio.h new file mode 100644 index 0000000000..9800fc2553 --- /dev/null +++ b/ioprio.h @@ -0,0 +1,57 @@ +#ifndef IOPRIO_H +#define IOPRIO_H + +/* This is minimal version of Linux' linux/ioprio.h header file, which + * is licensed GPL2 */ + +#include <unistd.h> +#include <sys/syscall.h> + +/* + * Gives us 8 prio classes with 13-bits of data for each class + */ +#define IOPRIO_BITS (16) +#define IOPRIO_CLASS_SHIFT (13) +#define IOPRIO_PRIO_MASK ((1UL << IOPRIO_CLASS_SHIFT) - 1) + +#define IOPRIO_PRIO_CLASS(mask) ((mask) >> IOPRIO_CLASS_SHIFT) +#define IOPRIO_PRIO_DATA(mask) ((mask) & IOPRIO_PRIO_MASK) +#define IOPRIO_PRIO_VALUE(class, data) (((class) << IOPRIO_CLASS_SHIFT) | data) + +#define ioprio_valid(mask) (IOPRIO_PRIO_CLASS((mask)) != IOPRIO_CLASS_NONE) + +/* + * These are the io priority groups as implemented by CFQ. RT is the realtime + * class, it always gets premium service. BE is the best-effort scheduling + * class, the default for any process. IDLE is the idle scheduling class, it + * is only served when no one else is using the disk. + */ +enum { + IOPRIO_CLASS_NONE, + IOPRIO_CLASS_RT, + IOPRIO_CLASS_BE, + IOPRIO_CLASS_IDLE, +}; + +/* + * 8 best effort priority levels are supported + */ +#define IOPRIO_BE_NR (8) + +enum { + IOPRIO_WHO_PROCESS = 1, + IOPRIO_WHO_PGRP, + IOPRIO_WHO_USER, +}; + +static inline int ioprio_set(int which, int who, int ioprio) +{ + return syscall(__NR_ioprio_set, which, who, ioprio); +} + +static inline int ioprio_get(int which, int who) +{ + return syscall(__NR_ioprio_get, which, who); +} + +#endif diff --git a/missing.h b/missing.h new file mode 100644 index 0000000000..6f1e5998ec --- /dev/null +++ b/missing.h @@ -0,0 +1,12 @@ +#ifndef foomissinghfoo +#define foomissinghfoo + +/* Missing glibc definitions to access certain kernel APIs */ + +#include <sys/resource.h> + +#ifndef RLIMIT_RTTIME +#define RLIMIT_RTTIME 15 +#endif + +#endif diff --git a/securebits.h b/securebits.h new file mode 100644 index 0000000000..a5b99a3dbf --- /dev/null +++ b/securebits.h @@ -0,0 +1,45 @@ +#ifndef _LINUX_SECUREBITS_H +#define _LINUX_SECUREBITS_H 1 + +/* This is minimal version of Linux' linux/securebits.h header file, + * which is licensed GPL2 */ + +#define SECUREBITS_DEFAULT 0x00000000 + +/* When set UID 0 has no special privileges. When unset, we support + inheritance of root-permissions and suid-root executable under + compatibility mode. We raise the effective and inheritable bitmasks + *of the executable file* if the effective uid of the new process is + 0. If the real uid is 0, we raise the effective (legacy) bit of the + executable file. */ +#define SECURE_NOROOT 0 +#define SECURE_NOROOT_LOCKED 1 /* make bit-0 immutable */ + +/* When set, setuid to/from uid 0 does not trigger capability-"fixup". + When unset, to provide compatiblility with old programs relying on + set*uid to gain/lose privilege, transitions to/from uid 0 cause + capabilities to be gained/lost. */ +#define SECURE_NO_SETUID_FIXUP 2 +#define SECURE_NO_SETUID_FIXUP_LOCKED 3 /* make bit-2 immutable */ + +/* When set, a process can retain its capabilities even after + transitioning to a non-root user (the set-uid fixup suppressed by + bit 2). Bit-4 is cleared when a process calls exec(); setting both + bit 4 and 5 will create a barrier through exec that no exec()'d + child can use this feature again. */ +#define SECURE_KEEP_CAPS 4 +#define SECURE_KEEP_CAPS_LOCKED 5 /* make bit-4 immutable */ + +/* Each securesetting is implemented using two bits. One bit specifies + whether the setting is on or off. The other bit specify whether the + setting is locked or not. A setting which is locked cannot be + changed from user-level. */ +#define issecure_mask(X) (1 << (X)) +#define issecure(X) (issecure_mask(X) & current_cred_xxx(securebits)) + +#define SECURE_ALL_BITS (issecure_mask(SECURE_NOROOT) | \ + issecure_mask(SECURE_NO_SETUID_FIXUP) | \ + issecure_mask(SECURE_KEEP_CAPS)) +#define SECURE_ALL_LOCKS (SECURE_ALL_BITS << 1) + +#endif /* !_LINUX_SECUREBITS_H */ |