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| author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-18 18:47:48 +0000 |
|---|---|---|
| committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-18 18:47:48 +0000 |
| commit | a1865fbd182b17f2d2f465f557af5b45501c5f1c (patch) | |
| tree | 59da519ef2e59c763bb8efdbe67bc348cf833767 /arch/x86/mm/maccess.c | |
| parent | Adding upstream version 6.7.9. (diff) | |
| download | linux-a1865fbd182b17f2d2f465f557af5b45501c5f1c.tar.xz linux-a1865fbd182b17f2d2f465f557af5b45501c5f1c.zip | |
Adding upstream version 6.7.12.upstream/6.7.12
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
| -rw-r--r-- | arch/x86/mm/maccess.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/arch/x86/mm/maccess.c b/arch/x86/mm/maccess.c index 6993f026ad..42115ac079 100644 --- a/arch/x86/mm/maccess.c +++ b/arch/x86/mm/maccess.c @@ -3,6 +3,8 @@ #include <linux/uaccess.h> #include <linux/kernel.h> +#include <asm/vsyscall.h> + #ifdef CONFIG_X86_64 bool copy_from_kernel_nofault_allowed(const void *unsafe_src, size_t size) { @@ -16,6 +18,14 @@ bool copy_from_kernel_nofault_allowed(const void *unsafe_src, size_t size) return false; /* + * Reading from the vsyscall page may cause an unhandled fault in + * certain cases. Though it is at an address above TASK_SIZE_MAX, it is + * usually considered as a user space address. + */ + if (is_vsyscall_vaddr(vaddr)) + return false; + + /* * Allow everything during early boot before 'x86_virt_bits' * is initialized. Needed for instruction decoding in early * exception handlers. |