Al Viro
1abf0c718f
New kind of open files - "location only". ...
New flag for open(2) - O_PATH. Semantics:
* pathname is resolved, but the file itself is _NOT_ opened
as far as filesystem is concerned.
* almost all operations on the resulting descriptors shall
fail with -EBADF. Exceptions are:
1) operations on descriptors themselves (i.e.
close(), dup(), dup2(), dup3(), fcntl(fd, F_DUPFD),
fcntl(fd, F_DUPFD_CLOEXEC, ...), fcntl(fd, F_GETFD),
fcntl(fd, F_SETFD, ...))
2) fcntl(fd, F_GETFL), for a common non-destructive way to
check if descriptor is open
3) "dfd" arguments of ...at(2) syscalls, i.e. the starting
points of pathname resolution
* closing such descriptor does *NOT* affect dnotify or
posix locks.
* permissions are checked as usual along the way to file;
no permission checks are applied to the file itself. Of course,
giving such thing to syscall will result in permission checks (at
the moment it means checking that starting point of ....at() is
a directory and caller has exec permissions on it).
fget() and fget_light() return NULL on such descriptors; use of
fget_raw() and fget_raw_light() is needed to get them. That protects
existing code from dealing with those things.
There are two things still missing (they come in the next commits):
one is handling of symlinks (right now we refuse to open them that
way; see the next commit for semantics related to those) and another
is descriptor passing via SCM_RIGHTS datagrams.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2011-03-15 02:21:45 -04:00
bitops: remove duplicated extern declarations
2010-10-09 21:51:45 +02:00
mm: Pass virtual address to [__]p{te,ud,md}_free_tlb()
2009-07-27 12:10:38 -07:00
Merge git://git.kernel.org/pub/scm/linux/kernel/git/arnd/asm-generic
2010-10-22 11:17:06 -07:00
audit: make link()/linkat() match "attribute change" predicate
2010-10-30 08:45:43 -04:00
panic: Allow warnings to set different taint flags
2010-05-19 08:36:48 +01:00
block: add helpers to run flush_dcache_page() against a bio and a request's pages
2009-11-26 09:16:19 +01:00
Fix IRQ flag handling naming
2010-10-07 14:08:55 +01:00
taskstats: use real microsecond granularity for CPU times
2010-10-27 18:03:17 -07:00
Driver Core: Add platform device arch data V3
2009-07-22 00:28:38 +02:00
dma-mapping: remove dma_is_consistent API
2010-08-11 08:59:21 -07:00
dma-mapping: remove unnecessary sync_single_range_* in dma_map_ops
2010-05-27 09:12:52 -07:00
New kind of open files - "location only".
2011-03-15 02:21:45 -04:00
Revert "gpiolib: annotate gpio-intialization with __must_check"
2011-01-13 17:26:46 -08:00
Fix IRQ flag handling naming
2010-10-07 14:08:55 +01:00
asm-generic/io.h: add reads[bwl]/writes[bwl] helpers
2011-01-10 07:18:03 -05:00
TTY: Add tty ioctl to figure device node of the system console.
2010-12-16 16:18:28 -08:00
core: Replace __get_cpu_var with __this_cpu_read if not used for an address.
2010-12-17 15:07:19 +01:00
Fix IRQ flag handling naming
2010-10-07 14:08:55 +01:00
include: replace unifdef-y with header-y
2010-08-14 22:26:51 +02:00
include: replace unifdef-y with header-y
2010-08-14 22:26:51 +02:00
asm-generic: kdebug.h: Checkpatch cleanup
2010-10-09 21:51:44 +02:00
include/asm-generic/kmap_types.h: add helpful reminder
2010-05-25 08:07:03 -07:00
local_t: Remove cpu_local_xx macros
2010-01-05 15:34:49 +09:00
arch: Implement local64_t
2010-06-09 11:12:36 +02:00
tree-wide: fix assorted typos all over the place
2009-12-04 15:39:55 +01:00
thp: mm: define MADV_NOHUGEPAGE
2011-01-13 17:32:47 -08:00
mm: add MAP_HUGETLB for mmaping pseudo-anonymous huge page regions
2009-09-22 07:17:41 -07:00
dma-mapping: pci: move pci_set_dma_mask and pci_set_consistent_dma_mask to pci-dma-compat.h
2010-03-12 15:52:42 -08:00
PCI: remove pcibios_scan_all_fns()
2009-09-09 13:29:18 -07:00
percpu: Optimize __get_cpu_var()
2010-09-10 10:56:51 +02:00
mm: Pass virtual address to [__]p{te,ud,md}_free_tlb()
2009-07-27 12:10:38 -07:00
mm: Pass virtual address to [__]p{te,ud,md}_free_tlb()
2009-07-27 12:10:38 -07:00
mm: <asm-generic/pgtable.h> must include <linux/mm_types.h>
2011-02-28 17:46:49 -08:00
asm-generic: remove ARCH_HAS_SG_CHAIN in scatterlist.h
2010-05-27 09:12:54 -07:00
asm/sections: add text/data checking functions for arches to override
2009-09-23 07:39:30 -07:00
HWPOISON: Add new SIGBUS error codes for hardware poison signals
2009-09-16 11:50:06 +02:00
net: Generalize socket rx gap / receive queue overflow cmsg
2009-10-12 13:26:31 -07:00
asm-generic/stat.h: support 64-bit file time_t for stat()
2010-11-01 15:31:29 -04:00
add f_flags to struct statfs(64)
2010-08-09 16:48:44 -04:00
asm-generic: syscall_get_nr returns int
2009-09-22 19:56:50 -07:00
Fix the declaration of sys_execve() in asm-generic/syscalls.h
2010-08-18 12:12:38 -07:00
asm-generic: cmpxchg does not handle non-long arguments
2010-10-09 21:51:27 +02:00
tty: Add EXTPROC support for LINEMODE
2010-08-10 13:47:39 -07:00
mm: Pass virtual address to [__]p{te,ud,md}_free_tlb()
2009-07-27 12:10:38 -07:00
topology: alternate fix for ia64 tiger_defconfig build breakage
2010-08-09 20:44:57 -07:00
asm-generic: uaccess: fix up local access_ok() usage
2009-06-19 14:58:08 +02:00
unistd.h: Add new syscalls numbers to asm-generic
2011-03-15 02:21:45 -04:00
tracing: Replace syscall_meta_data struct array with pointer array
2011-02-03 09:29:06 -05:00
1abf0c718f