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| author |   Haren Myneni <haren@linux.ibm.com> | 2025-06-10 07:42:27 +0530 |
|---|---|---|
| committer |   Madhavan Srinivasan <maddy@linux.ibm.com> | 2025-06-10 07:56:41 +0530 |
| commit | 0d67f0dee6c9176bc09a5482dd7346e3a0f14d0b (patch) | |
| tree | 3db88eab0771fde1d4660416bb54a3486a360651 | |
| parent | powerpc/powernv/memtrace: Fix out of bounds issue in memtrace mmap (diff) | |
| download | linux-rng-0d67f0dee6c9176bc09a5482dd7346e3a0f14d0b.tar.xz linux-rng-0d67f0dee6c9176bc09a5482dd7346e3a0f14d0b.zip | |
powerpc/vas: Return -EINVAL if the offset is non-zero in mmap()
The user space calls mmap() to map VAS window paste address
and the kernel returns the complete mapped page for each
window. So return -EINVAL if non-zero is passed for offset
parameter to mmap().
See Documentation/arch/powerpc/vas-api.rst for mmap()
restrictions.
Co-developed-by: Jonathan Greental <yonatan02greental@gmail.com>
Signed-off-by: Jonathan Greental <yonatan02greental@gmail.com>
Reported-by: Jonathan Greental <yonatan02greental@gmail.com>
Fixes: dda44eb29c23 ("powerpc/vas: Add VAS user space API")
Signed-off-by: Haren Myneni <haren@linux.ibm.com>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/20250610021227.361980-2-maddy@linux.ibm.com
| -rw-r--r-- | arch/powerpc/platforms/book3s/vas-api.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/arch/powerpc/platforms/book3s/vas-api.c b/arch/powerpc/platforms/book3s/vas-api.c index 0b6365d85d11..dc6f75d3ac6e 100644 --- a/arch/powerpc/platforms/book3s/vas-api.c +++ b/arch/powerpc/platforms/book3s/vas-api.c @@ -521,6 +521,15 @@ static int coproc_mmap(struct file *fp, struct vm_area_struct *vma) return -EINVAL; } + /* + * Map complete page to the paste address. So the user + * space should pass 0ULL to the offset parameter. + */ + if (vma->vm_pgoff) { + pr_debug("Page offset unsupported to map paste address\n"); + return -EINVAL; + } + /* Ensure instance has an open send window */ if (!txwin) { pr_err("No send window open?\n"); |