diff options
| 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/alpha/lib/strcpy.S | |
| 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/alpha/lib/strcpy.S')
| -rw-r--r-- | arch/alpha/lib/strcpy.S | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/arch/alpha/lib/strcpy.S b/arch/alpha/lib/strcpy.S new file mode 100644 index 000000000..d8773ba77 --- /dev/null +++ b/arch/alpha/lib/strcpy.S @@ -0,0 +1,25 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * arch/alpha/lib/strcpy.S + * Contributed by Richard Henderson (rth@tamu.edu) + * + * Copy a null-terminated string from SRC to DST. Return a pointer + * to the null-terminator in the source. + */ +#include <linux/export.h> + .text + + .align 3 + .globl strcpy + .ent strcpy +strcpy: + .frame $30, 0, $26 + .prologue 0 + + mov $16, $0 # set up return value + mov $26, $23 # set up return address + unop + br __stxcpy # do the copy + + .end strcpy + EXPORT_SYMBOL(strcpy) |