From: Huacai Chen chenhuacai@loongson.cn

mainline inclusion from mainline-v6.11-rc1 commit 7697a0fe0154468f5df35c23ebd7aa48994c2cdc category: feature bugzilla: https://gitee.com/openeuler/kernel/issues/IAZ33N CVE: NA

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i...

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Chromium sandbox apparently wants to deny statx [1] so it could properly inspect arguments after the sandboxed process later falls back to fstat. Because there's currently not a "fd-only" version of statx, so that the sandbox has no way to ensure the path argument is empty without being able to peek into the sandboxed process's memory. For architectures able to do newfstatat though, glibc falls back to newfstatat after getting -ENOSYS for statx, then the respective SIGSYS handler [2] takes care of inspecting the path argument, transforming allowed newfstatat's into fstat instead which is allowed and has the same type of return value.

But, as LoongArch is the first architecture to not have fstat nor newfstatat, the LoongArch glibc does not attempt falling back at all when it gets -ENOSYS for statx -- and you see the problem there!

Actually, back when the LoongArch port was under review, people were aware of the same problem with sandboxing clone3 [3], so clone was eventually kept. Unfortunately it seemed at that time no one had noticed statx, so besides restoring fstat/newfstatat to LoongArch uapi (and postponing the problem further), it seems inevitable that we would need to tackle seccomp deep argument inspection.

However, this is obviously a decision that shouldn't be taken lightly, so we just restore fstat/newfstatat by defining __ARCH_WANT_NEW_STAT in unistd.h. This is the simplest solution for now, and so we hope the community will tackle the long-standing problem of seccomp deep argument inspection in the future [4][5].

Also add "newstat" to syscall_abis_64 in Makefile.syscalls due to upstream asm-generic changes.

More infomation please reading this thread [6].

[1] https://chromium-review.googlesource.com/c/chromium/src/+/2823150 [2] https://chromium.googlesource.com/chromium/src/sandbox/+/c085b51940bd/linux/... [3] https://lore.kernel.org/linux-arch/20220511211231.GG7074@brightrain.aerifal.... [4] https://lwn.net/Articles/799557/ [5] https://lpc.events/event/4/contributions/560/attachments/397/640/deep-arg-in... [6] https://lore.kernel.org/loongarch/20240226-granit-seilschaft-eccc2433014d@br...

Cc: stable@vger.kernel.org Signed-off-by: Huacai Chen chenhuacai@loongson.cn --- arch/loongarch/include/asm/unistd.h | 1 + 1 file changed, 1 insertion(+)

diff --git a/arch/loongarch/include/asm/unistd.h b/arch/loongarch/include/asm/unistd.h index cfddb0116a8c..f1d2b7e5c062 100644 --- a/arch/loongarch/include/asm/unistd.h +++ b/arch/loongarch/include/asm/unistd.h @@ -8,4 +8,5 @@

#include <uapi/asm/unistd.h>

+#define __ARCH_WANT_NEW_STAT #define NR_syscalls (__NR_syscalls)