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bpf: Fix bpf_throw warning on 32-bit arch

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On 32-bit architectures, the pointer width is 32-bit, while we try to
cast from a u64 down to it, the compiler complains on mismatch in
integer size. Fix this by first casting to long which should match
the pointer width on targets supported by Linux.

Fixes: ec5290a178 ("bpf: Prevent KASAN false positive with bpf_throw")
Reported-by: Matthieu Baerts <matthieu.baerts@tessares.net>
Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Tested-by: Matthieu Baerts <matthieu.baerts@tessares.net>
Link: https://lore.kernel.org/r/20230918155233.297024-3-memxor@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Kumar Kartikeya Dwivedi 2023-09-18 17:52:32 +02:00 committed by Alexei Starovoitov
parent 4d84dcc739
commit 7d3460632d
1 changed files with 1 additions and 1 deletions
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2
kernel/bpf/helpers.c
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@ -2488,7 +2488,7 @@ __bpf_kfunc void bpf_throw(u64 cookie)
* deeper stack depths than ctx.sp as we do not return from bpf_throw,
* which skips compiler generated instrumentation to do the same.
*/
kasan_unpoison_task_stack_below((void *)ctx.sp);
kasan_unpoison_task_stack_below((void *)(long)ctx.sp);
ctx.aux->bpf_exception_cb(cookie, ctx.sp, ctx.bp);
WARN(1, "A call to BPF exception callback should never return\n");
}