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misc: Enable internal use of memory protection keys

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This adds the necessary hidden prototypes.
This commit is contained in:
Florian Weimer 2024-09-24 13:23:10 +02:00
parent 3ef26b7087
commit 7e21a65c58
9 changed files with 43 additions and 9 deletions
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16
sysdeps/unix/sysv/linux/include/bits/mman-shared.h Normal file
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@ -0,0 +1,16 @@
#include <sysdeps/unix/sysv/linux/bits/mman-shared.h>
#ifndef _ISOMAC
extern __typeof (pkey_alloc) __pkey_alloc;
libc_hidden_proto (__pkey_alloc)
extern __typeof (pkey_free) __pkey_free;
libc_hidden_proto (__pkey_free)
extern __typeof (pkey_mprotect) __pkey_mprotect;
libc_hidden_proto (__pkey_mprotect)
extern __typeof (pkey_get) __pkey_get;
libc_hidden_proto (__pkey_get)
extern __typeof (pkey_set) __pkey_set;
libc_hidden_proto (__pkey_set)
#endif

5
sysdeps/unix/sysv/linux/pkey_get.c
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@ -17,10 +17,13 @@
<https://www.gnu.org/licenses/>. */
#include <errno.h>
#include <sys/mman.h>
int
pkey_get (int key)
__pkey_get (int key)
{
__set_errno (ENOSYS);
return -1;
}
libc_hidden_def (__pkey_get)
weak_alias (__pkey_get, pkey_get)

4
sysdeps/unix/sysv/linux/pkey_mprotect.c
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@ -22,7 +22,7 @@
#include <sysdep.h>
int
pkey_mprotect (void *addr, size_t len, int prot, int pkey)
__pkey_mprotect (void *addr, size_t len, int prot, int pkey)
{
if (pkey == -1)
/* If the key is -1, the system call is precisely equivalent to
@ -30,3 +30,5 @@ pkey_mprotect (void *addr, size_t len, int prot, int pkey)
return __mprotect (addr, len, prot);
return INLINE_SYSCALL_CALL (pkey_mprotect, addr, len, prot, pkey);
}
libc_hidden_def (__pkey_mprotect)
weak_alias (__pkey_mprotect, pkey_mprotect)

5
sysdeps/unix/sysv/linux/pkey_set.c
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@ -17,10 +17,13 @@
<https://www.gnu.org/licenses/>. */
#include <errno.h>
#include <sys/mman.h>
int
pkey_set (int key, unsigned int access_rights)
__pkey_set (int key, unsigned int access_rights)
{
__set_errno (ENOSYS);
return -1;
}
libc_hidden_def (__pkey_set)
weak_alias (__pkey_set, pkey_set)

4
sysdeps/unix/sysv/linux/powerpc/powerpc64/pkey_get.c
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@ -21,7 +21,7 @@
#include <sys/mman.h>
int
pkey_get (int key)
__pkey_get (int key)
{
if (key < 0 || key > PKEY_MAX)
{
@ -40,3 +40,5 @@ pkey_get (int key)
return PKEY_DISABLE_WRITE;
return 0;
}
libc_hidden_def (__pkey_get)
weak_alias (__pkey_get, pkey_get)

4
sysdeps/unix/sysv/linux/powerpc/powerpc64/pkey_set.c
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@ -21,7 +21,7 @@
#include <sys/mman.h>
int
pkey_set (int key, unsigned int rights)
__pkey_set (int key, unsigned int rights)
{
if (key < 0 || key > PKEY_MAX || rights > 3)
{
@ -46,3 +46,5 @@ pkey_set (int key, unsigned int rights)
pkey_write (amr);
return 0;
}
libc_hidden_def (__pkey_set)
weak_alias (__pkey_set, pkey_set)

4
sysdeps/unix/sysv/linux/syscalls.list
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@ -102,8 +102,8 @@ name_to_handle_at EXTRA name_to_handle_at i:isppi name_to_handle_at
setns EXTRA setns i:ii setns
memfd_create EXTRA memfd_create i:si memfd_create
pkey_alloc EXTRA pkey_alloc i:ii pkey_alloc
pkey_free EXTRA pkey_free i:i pkey_free
pkey_alloc EXTRA pkey_alloc i:ii __pkey_alloc pkey_alloc
pkey_free EXTRA pkey_free i:i __pkey_free pkey_free
gettid EXTRA gettid Ei: __gettid gettid
tgkill EXTRA tgkill i:iii __tgkill tgkill
close_range - close_range i:iii __close_range close_range

5
sysdeps/unix/sysv/linux/x86/pkey_get.c
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@ -18,9 +18,10 @@
#include <arch-pkey.h>
#include <errno.h>
#include <sys/mman.h>
int
pkey_get (int key)
__pkey_get (int key)
{
if (key < 0 || key > 15)
{
@ -31,3 +32,5 @@ pkey_get (int key)
return (pkru >> (2 * key)) & 3;
return 0;
}
libc_hidden_def (__pkey_get)
weak_alias (__pkey_get, pkey_get)

5
sysdeps/unix/sysv/linux/x86/pkey_set.c
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@ -18,9 +18,10 @@
#include <arch-pkey.h>
#include <errno.h>
#include <sys/mman.h>
int
pkey_set (int key, unsigned int rights)
__pkey_set (int key, unsigned int rights)
{
if (key < 0 || key > 15 || rights > 3)
{
@ -33,3 +34,5 @@ pkey_set (int key, unsigned int rights)
pkey_write (pkru);
return 0;
}
libc_hidden_def (__pkey_set)
weak_alias (__pkey_set, pkey_set)