Re: [PATCH 07/15] parisc: use generic sys_fanotify_mark implementation

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On 6/20/24 18:23, Arnd Bergmann wrote:
From: Arnd Bergmann <arnd@xxxxxxxx>

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,

r26 is arg0, r25 is arg1, and so on.
I'm not sure I would call this "sorted backwards".
I think the reason is simply that hppa is the only 32-bit big-endian
arch left...

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.

I appreciate such cleanups to make arches consistent.
But it's bad if breakages aren't noticed or reported then...

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.

Agreed (assuming we have really a problem on parisc).

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>
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 patch looks good at first sight.
I'll pick it up in my parisc git tree and will do some testing the
next few days and then push forward for 6.11 when it opens....

Thank you!!

Helge

The alternative is to fix this by reverting glibc back to the
unusual behavior.
---
  arch/parisc/Kconfig                     | 1 +
  arch/parisc/kernel/sys_parisc32.c       | 9 ---------
  arch/parisc/kernel/syscalls/syscall.tbl | 2 +-
  3 files changed, 2 insertions(+), 10 deletions(-)

diff --git a/arch/parisc/Kconfig b/arch/parisc/Kconfig
index daafeb20f993..dc9b902de8ea 100644
--- a/arch/parisc/Kconfig
+++ b/arch/parisc/Kconfig
@@ -16,6 +16,7 @@ config PARISC
  	select ARCH_HAS_UBSAN
  	select ARCH_HAS_PTE_SPECIAL
  	select ARCH_NO_SG_CHAIN
+	select ARCH_SPLIT_ARG64 if !64BIT
  	select ARCH_SUPPORTS_HUGETLBFS if PA20
  	select ARCH_SUPPORTS_MEMORY_FAILURE
  	select ARCH_STACKWALK
diff --git a/arch/parisc/kernel/sys_parisc32.c b/arch/parisc/kernel/sys_parisc32.c
index 2a12a547b447..826c8e51b585 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 39e67fab7515..66dc406b12e4 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






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