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author | Alexei Starovoitov <ast@kernel.org> | 2023-04-10 19:43:44 +0200 |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-06-28 11:12:17 +0200 |
commit | 2e7ad879e1b0256fb9e4703fd6cd2864d707dea7 (patch) | |
tree | 3ecd534ce17812032ff5dd278964b6109eda277c /mm | |
parent | 4ed740c6482f84cbb910f9f4e9822a08208ab787 (diff) | |
download | linux-2e7ad879e1b0256fb9e4703fd6cd2864d707dea7.tar.gz |
mm: Fix copy_from_user_nofault().
commit d319f344561de23e810515d109c7278919bff7b0 upstream. There are several issues with copy_from_user_nofault(): - access_ok() is designed for user context only and for that reason it has WARN_ON_IN_IRQ() which triggers when bpf, kprobe, eprobe and perf on ppc are calling it from irq. - it's missing nmi_uaccess_okay() which is a nop on all architectures except x86 where it's required. The comment in arch/x86/mm/tlb.c explains the details why it's necessary. Calling copy_from_user_nofault() from bpf, [ke]probe without this check is not safe. - __copy_from_user_inatomic() under CONFIG_HARDENED_USERCOPY is calling check_object_size()->__check_object_size()->check_heap_object()->find_vmap_area()->spin_lock() which is not safe to do from bpf, [ke]probe and perf due to potential deadlock. Fix all three issues. At the end the copy_from_user_nofault() becomes equivalent to copy_from_user_nmi() from safety point of view with a difference in the return value. Reported-by: Hsin-Wei Hung <hsinweih@uci.edu> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: Florian Lehner <dev@der-flo.net> Tested-by: Hsin-Wei Hung <hsinweih@uci.edu> Tested-by: Florian Lehner <dev@der-flo.net> Link: https://lore.kernel.org/r/20230410174345.4376-2-dev@der-flo.net Signed-off-by: Alexei Starovoitov <ast@kernel.org> Cc: Javier Honduvilla Coto <javierhonduco@gmail.com> Cc: Daniel Borkmann <daniel@iogearbox.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'mm')
-rw-r--r-- | mm/maccess.c | 16 | ||||
-rw-r--r-- | mm/usercopy.c | 2 |
2 files changed, 12 insertions, 6 deletions
diff --git a/mm/maccess.c b/mm/maccess.c index 074f6b086671..518a25667323 100644 --- a/mm/maccess.c +++ b/mm/maccess.c @@ -5,6 +5,7 @@ #include <linux/export.h> #include <linux/mm.h> #include <linux/uaccess.h> +#include <asm/tlb.h> bool __weak copy_from_kernel_nofault_allowed(const void *unsafe_src, size_t size) @@ -113,11 +114,16 @@ Efault: long copy_from_user_nofault(void *dst, const void __user *src, size_t size) { long ret = -EFAULT; - if (access_ok(src, size)) { - pagefault_disable(); - ret = __copy_from_user_inatomic(dst, src, size); - pagefault_enable(); - } + + if (!__access_ok(src, size)) + return ret; + + if (!nmi_uaccess_okay()) + return ret; + + pagefault_disable(); + ret = __copy_from_user_inatomic(dst, src, size); + pagefault_enable(); if (ret) return -EFAULT; diff --git a/mm/usercopy.c b/mm/usercopy.c index c1ee15a98633..434fce112acb 100644 --- a/mm/usercopy.c +++ b/mm/usercopy.c @@ -172,7 +172,7 @@ static inline void check_heap_object(const void *ptr, unsigned long n, return; } - if (is_vmalloc_addr(ptr)) { + if (is_vmalloc_addr(ptr) && !pagefault_disabled()) { struct vmap_area *area = find_vmap_area(addr); if (!area) |