This is a note to let you know that I've just added the patch titled
parisc: use generic sys_fanotify_mark implementation
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
parisc-use-generic-sys_fanotify_mark-implementation.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit c5abcae9146e760a1a59006b2e85bbb36d403804
Author: Arnd Bergmann <arnd@xxxxxxxx>
Date: Fri Jun 7 13:40:45 2024 +0200
parisc: use generic sys_fanotify_mark implementation
[ Upstream commit 403f17a330732a666ae793f3b15bc75bb5540524 ]
The sys_fanotify_mark() syscall on parisc uses the reverse word order
for the two halves of the 64-bit argument compared to all syscalls on
all 32-bit architectures. As far as I can tell, the problem is that
the function arguments on parisc are sorted backwards (26, 25, 24, 23,
...) compared to everyone else, so the calling conventions of using an
even/odd register pair in native word order result in the lower word
coming first in function arguments, matching the expected behavior
on little-endian architectures. The system call conventions however
ended up matching what the other 32-bit architectures do.
A glibc cleanup in 2020 changed the userspace behavior in a way that
handles all architectures consistently, but this inadvertently broke
parisc32 by changing to the same method as everyone else.
The change made it into glibc-2.35 and subsequently into debian 12
(bookworm), which is the latest stable release. This means we
need to choose between reverting the glibc change or changing the
kernel to match it again, but either hange will leave some systems
broken.
Pick the option that is more likely to help current and future
users and change the kernel to match current glibc. This also
means the behavior is now consistent across architectures, but
it breaks running new kernels with old glibc builds before 2.35.
Link: https://sourceware.org/git/?p=glibc.git;a=commitdiff;h=d150181d73d9
Link: https://git.kernel.org/pub/scm/linux/kernel/git/history/history.git/commit/arch/parisc/kernel/sys_parisc.c?h=57b1dfbd5b4a39d
Cc: Adhemerval Zanella <adhemerval.zanella@xxxxxxxxxx>
Tested-by: Helge Deller <deller@xxxxxx>
Acked-by: Helge Deller <deller@xxxxxx>
Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
---
I found this through code inspection, please double-check to make
sure I got the bug and the fix right.
The alternative is to fix this by reverting glibc back to the
unusual behavior.
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/arch/parisc/Kconfig b/arch/parisc/Kconfig
index 117b0f882750a..6ac0c4b98e281 100644
--- a/arch/parisc/Kconfig
+++ b/arch/parisc/Kconfig
@@ -12,6 +12,7 @@ config PARISC
select ARCH_HAS_STRICT_MODULE_RWX
select ARCH_HAS_UBSAN_SANITIZE_ALL
select ARCH_NO_SG_CHAIN
+ select ARCH_SPLIT_ARG64 if !64BIT
select ARCH_SUPPORTS_HUGETLBFS if PA20
select ARCH_SUPPORTS_MEMORY_FAILURE
select DMA_OPS
diff --git a/arch/parisc/kernel/sys_parisc32.c b/arch/parisc/kernel/sys_parisc32.c
index 2a12a547b447b..826c8e51b5853 100644
--- a/arch/parisc/kernel/sys_parisc32.c
+++ b/arch/parisc/kernel/sys_parisc32.c
@@ -23,12 +23,3 @@ asmlinkage long sys32_unimplemented(int r26, int r25, int r24, int r23,
current->comm, current->pid, r20);
return -ENOSYS;
}
-
-asmlinkage long sys32_fanotify_mark(compat_int_t fanotify_fd, compat_uint_t flags,
- compat_uint_t mask0, compat_uint_t mask1, compat_int_t dfd,
- const char __user * pathname)
-{
- return sys_fanotify_mark(fanotify_fd, flags,
- ((__u64)mask1 << 32) | mask0,
- dfd, pathname);
-}
diff --git a/arch/parisc/kernel/syscalls/syscall.tbl b/arch/parisc/kernel/syscalls/syscall.tbl
index 3e7ded09e00a5..5774509ea4a3b 100644
--- a/arch/parisc/kernel/syscalls/syscall.tbl
+++ b/arch/parisc/kernel/syscalls/syscall.tbl
@@ -364,7 +364,7 @@
320 common accept4 sys_accept4
321 common prlimit64 sys_prlimit64
322 common fanotify_init sys_fanotify_init
-323 common fanotify_mark sys_fanotify_mark sys32_fanotify_mark
+323 common fanotify_mark sys_fanotify_mark compat_sys_fanotify_mark
324 32 clock_adjtime sys_clock_adjtime32
324 64 clock_adjtime sys_clock_adjtime
325 common name_to_handle_at sys_name_to_handle_at
