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2019-03-04get rid of legacy 'get_ds()' functionLinus Torvalds1-1/+0
Every in-kernel use of this function defined it to KERNEL_DS (either as an actual define, or as an inline function). It's an entirely historical artifact, and long long long ago used to actually read the segment selector valueof '%ds' on x86. Which in the kernel is always KERNEL_DS. Inspired by a patch from Jann Horn that just did this for a very small subset of users (the ones in fs/), along with Al who suggested a script. I then just took it to the logical extreme and removed all the remaining gunk. Roughly scripted with git grep -l '(get_ds())' -- :^tools/ | xargs sed -i 's/(get_ds())/(KERNEL_DS)/' git grep -lw 'get_ds' -- :^tools/ | xargs sed -i '/^#define get_ds()/d' plus manual fixups to remove a few unusual usage patterns, the couple of inline function cases and to fix up a comment that had become stale. The 'get_ds()' function remains in an x86 kvm selftest, since in user space it actually does something relevant. Inspired-by: Jann Horn <jannh@google.com> Inspired-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2019-01-08arch/openrisc: Fix issues with access_ok()Stafford Horne1-2/+6
The commit 594cc251fdd0 ("make 'user_access_begin()' do 'access_ok()'") exposed incorrect implementations of access_ok() macro in several architectures. This change fixes 2 issues found in OpenRISC. OpenRISC was not properly using parenthesis for arguments and also using arguments twice. This patch fixes those 2 issues. I test booted this patch with v5.0-rc1 on qemu and it's working fine. Cc: Guenter Roeck <linux@roeck-us.net> Cc: Linus Torvalds <torvalds@linux-foundation.org> Reported-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Stafford Horne <shorne@gmail.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2019-01-03Remove 'type' argument from access_ok() functionLinus Torvalds1-4/+4
Nobody has actually used the type (VERIFY_READ vs VERIFY_WRITE) argument of the user address range verification function since we got rid of the old racy i386-only code to walk page tables by hand. It existed because the original 80386 would not honor the write protect bit when in kernel mode, so you had to do COW by hand before doing any user access. But we haven't supported that in a long time, and these days the 'type' argument is a purely historical artifact. A discussion about extending 'user_access_begin()' to do the range checking resulted this patch, because there is no way we're going to move the old VERIFY_xyz interface to that model. And it's best done at the end of the merge window when I've done most of my merges, so let's just get this done once and for all. This patch was mostly done with a sed-script, with manual fix-ups for the cases that weren't of the trivial 'access_ok(VERIFY_xyz' form. There were a couple of notable cases: - csky still had the old "verify_area()" name as an alias. - the iter_iov code had magical hardcoded knowledge of the actual values of VERIFY_{READ,WRITE} (not that they mattered, since nothing really used it) - microblaze used the type argument for a debug printout but other than those oddities this should be a total no-op patch. I tried to fix up all architectures, did fairly extensive grepping for access_ok() uses, and the changes are trivial, but I may have missed something. Any missed conversion should be trivially fixable, though. Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2017-05-15kill strlen_user()Al Viro1-1/+0
no callers, no consistent semantics, no sane way to use it... Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2017-04-26Merge branches 'uaccess.alpha', 'uaccess.arc', 'uaccess.arm', 'uaccess.arm64', 'uaccess.avr32', 'uaccess.bfin', 'uaccess.c6x', 'uaccess.cris', 'uaccess.frv', 'uaccess.h8300', 'uaccess.hexagon', 'uaccess.ia64', 'uaccess.m32r', 'uaccess.m68k', 'uaccess.metag', 'uaccess.microblaze', 'uaccess.mips', ↵Al Viro1-46/+9
'uaccess.mn10300', 'uaccess.nios2', 'uaccess.openrisc', 'uaccess.parisc', 'uaccess.powerpc', 'uaccess.s390', 'uaccess.score', 'uaccess.sh', 'uaccess.sparc', 'uaccess.tile', 'uaccess.um', 'uaccess.unicore32', 'uaccess.x86' and 'uaccess.xtensa' into work.uaccess
2017-04-02Merge branch 'parisc-4.11-3' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux into uaccess.pariscAl Viro1-1/+1
2017-03-28openrisc: switch to RAW_COPY_USERAl Viro1-22/+6
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2017-03-28openrisc: switch to generic extable.hAl Viro1-17/+1
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2017-03-28new helper: uaccess_kernel()Al Viro1-1/+1
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2017-03-16openrisc: fix issue handling 8 byte get_user callsStafford Horne1-1/+1
Was getting the following error with allmodconfig: ERROR: "__get_user_bad" [lib/test_user_copy.ko] undefined! This was simply a missing break statement, causing an unwanted fall through. Signed-off-by: Stafford Horne <shorne@gmail.com>
2017-03-05uaccess: drop duplicate includes from asm/uaccess.hAl Viro1-2/+0
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2017-03-05uaccess: move VERIFY_{READ,WRITE} definitions to linux/uaccess.hAl Viro1-3/+0
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2016-09-27exceptions: detritus removalAl Viro1-4/+0
externs and defines for stuff that is never used Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2016-09-18openrisc: fix the fix of copy_from_user()Guenter Roeck1-1/+1
Since commit acb2505d0119 ("openrisc: fix copy_from_user()"), copy_from_user() returns the number of bytes requested, not the number of bytes not copied. Cc: Al Viro <viro@zeniv.linux.org.uk> Fixes: acb2505d0119 ("openrisc: fix copy_from_user()") Signed-off-by: Guenter Roeck <linux@roeck-us.net>
2016-09-13openrisc: fix copy_from_user()Al Viro1-24/+11
... that should zero on faults. Also remove the <censored> helpful logics wrt range truncation copied from ppc32. Where it had ever been needed only in case of copy_from_user() *and* had not been merged into the mainline until a month after the need had disappeared. A decade before openrisc went into mainline, I might add... Cc: stable@vger.kernel.org Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2015-01-13openrisc/uaccess: fix sparse errorsMichael S. Tsirkin1-2/+2
virtio wants to read bitwise types from userspace using get_user. At the moment this triggers sparse errors, since the value is passed through an integer. Fix that up using __force. Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2012-05-27openrisc: use generic strnlen_user() functionJonas Bonn1-28/+2
The generic version is both easier to support and more correct. Signed-off-by: Jonas Bonn <jonas@southpole.se> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2012-05-25openrisc: use generic strncpy_from_userJonas Bonn1-7/+3
As per commits 2922585b9329 ("lib: Sparc's strncpy_from_user is generic enough, move under lib/") and 92ae03f2ef99 ("x86: merge 32/64-bit versions of 'strncpy_from_user()' and speed it up"), and corresponding discussion on linux-arch. Signed-off-by: Jonas Bonn <jonas@southpole.se> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2012-02-17openrisc: included linux/thread_info.h twiceDanny Kukawka1-1/+0
arch/openrisc/include/asm/uaccess.h: included 'linux/thread_info.h' twice, remove the duplicate. Signed-off-by: Danny Kukawka <danny.kukawka@bisect.de> Signed-off-by: Jonas Bonn <jonas@southpole.se>
2011-07-22OpenRISC: Memory managementJonas Bonn1-0/+355
Signed-off-by: Jonas Bonn <jonas@southpole.se> Reviewed-by: Arnd Bergmann <arnd@arndb.de>
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