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| author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-16 03:22:47 +0000 |
|---|---|---|
| committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-16 03:22:47 +0000 |
| commit | 31d3cc774e9124f10d3ed2ea144a6e232e93e822 (patch) | |
| tree | de1ac8afc7248eec4b2fb60496b8e9273452d9f7 /arch/x86/mm/maccess.c | |
| parent | Adding upstream version 6.1.82. (diff) | |
| download | linux-31d3cc774e9124f10d3ed2ea144a6e232e93e822.tar.xz linux-31d3cc774e9124f10d3ed2ea144a6e232e93e822.zip | |
Adding upstream version 6.1.85.upstream/6.1.85
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'arch/x86/mm/maccess.c')
| -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 6993f026a..42115ac07 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. |