linux.git/arch/parisc/kernel/sys_parisc.c, branch v6.5

io_uring/parisc: Adjust pgoff in io_uring mmap() for parisc

2023-08-08T18:37:01+00:00

The changes from commit 32832a407a71 ("io_uring: Fix io_uring mmap() by
using architecture-provided get_unmapped_area()") to the parisc
implementation of get_unmapped_area() broke glibc's locale-gen
executable when running on parisc.

This patch reverts those architecture-specific changes, and instead
adjusts in io_uring_mmu_get_unmapped_area() the pgoff offset which is
then given to parisc's get_unmapped_area() function.  This is much
cleaner than the previous approach, and we still will get a coherent
addresss.

This patch has no effect on other architectures (SHM_COLOUR is only
defined on parisc), and the liburing testcase stil passes on parisc.

Cc: stable@vger.kernel.org # 6.4
Signed-off-by: Helge Deller 
Reported-by: Christoph Biedl 
Fixes: 32832a407a71 ("io_uring: Fix io_uring mmap() by using architecture-provided get_unmapped_area()")
Fixes: d808459b2e31 ("io_uring: Adjust mapping wrt architecture aliasing requirements")
Link: https://lore.kernel.org/r/ZNEyGV0jyI8kOOfz@p100
Signed-off-by: Jens Axboe

Merge tag 'io_uring-6.5-2023-07-21' of git://git.kernel.dk/linux

2023-07-22T17:46:30+00:00

Pull io_uring fixes from Jens Axboe:

 - Fix for io-wq not always honoring REQ_F_NOWAIT, if it was set and
   punted directly (eg via DRAIN) (me)

 - Capability check fix (Ondrej)

 - Regression fix for the mmap changes that went into 6.4, which
   apparently broke IA64 (Helge)

* tag 'io_uring-6.5-2023-07-21' of git://git.kernel.dk/linux:
  ia64: mmap: Consider pgoff when searching for free mapping
  io_uring: Fix io_uring mmap() by using architecture-provided get_unmapped_area()
  io_uring: treat -EAGAIN for REQ_F_NOWAIT as final for io-wq
  io_uring: don't audit the capability check in io_uring_create()

io_uring: Fix io_uring mmap() by using architecture-provided get_unmapped_area()

2023-07-21T15:41:29+00:00

The io_uring testcase is broken on IA-64 since commit d808459b2e31
("io_uring: Adjust mapping wrt architecture aliasing requirements").

The reason is, that this commit introduced an own architecture
independend get_unmapped_area() search algorithm which finds on IA-64 a
memory region which is outside of the regular memory region used for
shared userspace mappings and which can't be used on that platform
due to aliasing.

To avoid similar problems on IA-64 and other platforms in the future,
it's better to switch back to the architecture-provided
get_unmapped_area() function and adjust the needed input parameters
before the call. Beside fixing the issue, the function now becomes
easier to understand and maintain.

This patch has been successfully tested with the io_uring testcase on
physical x86-64, ppc64le, IA-64 and PA-RISC machines. On PA-RISC the LTP
mmmap testcases did not report any regressions.

Cc: stable@vger.kernel.org # 6.4
Signed-off-by: Helge Deller 
Reported-by: matoro 
Fixes: d808459b2e31 ("io_uring: Adjust mapping wrt architecture aliasing requirements")
Link: https://lore.kernel.org/r/20230721152432.196382-2-deller@gmx.de
Signed-off-by: Jens Axboe

parisc: sys_parisc: parisc_personality() is called from asm code

2023-06-30T15:14:15+00:00

Signed-off-by: Helge Deller

parisc: Cleanup mmap implementation regarding color alignment

2023-05-03T15:43:26+00:00

This change simplifies the randomization of file mapping regions. It
reworks the code to remove duplication. The flow is now similar to
that for mips. Finally, we consistently use the do_color_align variable
to determine when color alignment is needed.

Tested on rp3440.

Signed-off-by: John David Anglin 
Signed-off-by: Helge Deller

parisc: Align parisc MADV_XXX constants with all other architectures

2022-12-17T22:19:39+00:00

Adjust some MADV_XXX constants to be in sync what their values are on
all other platforms. There is currently no reason to have an own
numbering on parisc, but it requires workarounds in many userspace
sources (e.g. glibc, qemu, ...) - which are often forgotten and thus
introduce bugs and different behaviour on parisc.

A wrapper avoids an ABI breakage for existing userspace applications by
translating any old values to the new ones, so this change allows us to
move over all programs to the new ABI over time.

Signed-off-by: Helge Deller

treewide: use get_random_u32() when possible

2022-10-11T23:42:58+00:00

The prandom_u32() function has been a deprecated inline wrapper around
get_random_u32() for several releases now, and compiles down to the
exact same code. Replace the deprecated wrapper with a direct call to
the real function. The same also applies to get_random_int(), which is
just a wrapper around get_random_u32(). This was done as a basic find
and replace.

Reviewed-by: Greg Kroah-Hartman 
Reviewed-by: Kees Cook 
Reviewed-by: Yury Norov 
Reviewed-by: Jan Kara  # for ext4
Acked-by: Toke Høiland-Jørgensen  # for sch_cake
Acked-by: Chuck Lever  # for nfsd
Acked-by: Jakub Kicinski 
Acked-by: Mika Westerberg  # for thunderbolt
Acked-by: Darrick J. Wong  # for xfs
Acked-by: Helge Deller  # for parisc
Acked-by: Heiko Carstens  # for s390
Signed-off-by: Jason A. Donenfeld

parisc: enhance warning regarding usage of O_NONBLOCK

2021-11-01T06:36:00+00:00

Instead of showing only the very first application which needs
recompile, show all of them, but print them only once.

Includes typo fix noticed by Colin Ian King.

Signed-off-by: Helge Deller 
Signed-off-by: Colin Ian King

parisc: Make user stack size configurable

2020-11-11T13:59:08+00:00

On parisc we need to initialize the memory layout for the user stack at
process start time to a fixed size, which up until now was limited to
the size as given by CONFIG_MAX_STACK_SIZE_MB at compile time.

This hard limit was too small and showed problems when compiling
ruby2.7, qmlcachegen and some Qt packages.

This patch changes two things:
a) It increases the default maximum stack size to 100MB.
b) Users can modify the stack hard limit size with ulimit and then newly
   forked processes will use the given stack size which can even be bigger
   than the default 100MB.

Reported-by: John David Anglin 
Signed-off-by: Helge Deller

parisc: Add wrapper syscalls to fix O_NONBLOCK flag usage

2020-10-23T18:14:07+00:00

The commit 75ae04206a4d ("parisc: Define O_NONBLOCK to become
000200000") changed the O_NONBLOCK constant to have only one bit set
(like all other architectures). This change broke some existing
userspace code (e.g.  udevadm, systemd-udevd, elogind) which called
specific syscalls which do strict value checking on their flag
parameter.

This patch adds wrapper functions for the relevant syscalls. The
wrappers masks out any old invalid O_NONBLOCK flags, reports in the
syslog if the old O_NONBLOCK value was used and then calls the target
syscall with the new O_NONBLOCK value.

Fixes: 75ae04206a4d ("parisc: Define O_NONBLOCK to become 000200000")
Signed-off-by: Helge Deller 
Tested-by: Meelis Roos 
Tested-by: Jeroen Roovers