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| author | Eduard Zingerman <eddyz87@gmail.com> | 2026-09-04 17:05:56 -0700 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2026-09-04 18:17:30 -0700 |
| commit | 506ada89629ec7059b96ecfb0dc7d33ece0103ca (patch) | |
| tree | 0b07297409b68d2333fb4f0eae7f3b072eb68d4c /arch/powerpc/math-emu/lfd.c | |
| download | linux-stable-506ada89629ec7059b96ecfb0dc7d33ece0103ca.tar.gz linux-stable-506ada89629ec7059b96ecfb0dc7d33ece0103ca.zip | |
bpf: mark a NULL kfunc argument precisegrafted
check_kfunc_arg() allows bpf_register_is_null() for nullable arguments
w/o marking the underlying scalar register precise. Hence a checkpoint
created on such a path would prune against arbitrary scalar value.
Fixes: 3bda08b63670 ("bpf: Allow NULL buffers in bpf_dynptr_slice(_rw)")
Signed-off-by: Eduard Zingerman <eddyz87@gmail.com>
Link: https://lore.kernel.org/r/20260904-register-is-null-precise-fixes-v1-5-0f5a360ff15d@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'arch/powerpc/math-emu/lfd.c')
| -rw-r--r-- | arch/powerpc/math-emu/lfd.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/arch/powerpc/math-emu/lfd.c b/arch/powerpc/math-emu/lfd.c new file mode 100644 index 000000000..3a6b03d99 --- /dev/null +++ b/arch/powerpc/math-emu/lfd.c @@ -0,0 +1,20 @@ +// SPDX-License-Identifier: GPL-2.0 +#include <linux/types.h> +#include <linux/errno.h> +#include <linux/uaccess.h> + +#include <asm/sfp-machine.h> +#include <math-emu/double.h> + +int +lfd(void *frD, void *ea) +{ + if (copy_from_user(frD, ea, sizeof(double))) + return -EFAULT; +#ifdef DEBUG + printk("%s: D %p, ea %p: ", __func__, frD, ea); + dump_double(frD); + printk("\n"); +#endif + return 0; +} |