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open*(2) compat fixes (s390, arm64)

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The usual rules for open()/openat()/open_by_handle_at() are
 1) native 32bit - don't force O_LARGEFILE in flags
 2) native 64bit - force O_LARGEFILE in flags
 3) compat on 64bit host - as for native 32bit
 4) native 32bit ABI for 64bit system (mips/n32, x86/x32) - as for
    native 64bit

There are only two exceptions - s390 compat has open() forcing
O_LARGEFILE and arm64 compat has open_by_handle_at() doing the same
thing.  The same binaries on native host (s390/31 and arm resp.) will
*not* force O_LARGEFILE, so IMO both are emulation bugs.

Objections? The fix is obvious...

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Al Viro 2012-12-02 17:55:07 +00:00 committed by Linus Torvalds
parent 3c46f3d640
commit 9d73fc2d64
2 changed files with 2 additions and 2 deletions
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2
arch/arm64/include/asm/unistd32.h
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@ -392,7 +392,7 @@ __SYSCALL(367, sys_fanotify_init)
__SYSCALL(368, compat_sys_fanotify_mark_wrapper)
__SYSCALL(369, sys_prlimit64)
__SYSCALL(370, sys_name_to_handle_at)
__SYSCALL(371, sys_open_by_handle_at)
__SYSCALL(371, compat_sys_open_by_handle_at)
__SYSCALL(372, sys_clock_adjtime)
__SYSCALL(373, sys_syncfs)

2
arch/s390/kernel/compat_wrapper.S
View File

@ -28,7 +28,7 @@ ENTRY(sys32_open_wrapper)
llgtr %r2,%r2 # const char *
lgfr %r3,%r3 # int
lgfr %r4,%r4 # int
jg sys_open # branch to system call
jg compat_sys_open # branch to system call
ENTRY(sys32_close_wrapper)
llgfr %r2,%r2 # unsigned int