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| author | Eric W. Biederman <ebiederm@xmission.com> | 2021-10-20 19:43:54 +0200 |
|---|---|---|
| committer | Eric W. Biederman <ebiederm@xmission.com> | 2021-10-25 22:56:29 +0200 |
| commit | 984bd71fb32032ef395a895916853964166b322b (patch) | |
| tree | c094ae98dade56d9f32f1021c0040de180c639e2 | |
| parent | signal/powerpc: On swapcontext failure force SIGSEGV (diff) | |
| download | linux-984bd71fb32032ef395a895916853964166b322b.tar.xz linux-984bd71fb32032ef395a895916853964166b322b.zip | |
signal/sparc: In setup_tsb_params convert open coded BUG into BUG
The function setup_tsb_params has exactly one caller tsb_grow. The
function tsb_grow passes in a tsb_bytes value that is between 8192 and
1048576 inclusive, and is guaranteed to be a power of 2. The function
setup_tsb_params verifies this property with a switch statement and
then prints an error and causes the task to exit if this is not true.
In practice that print statement can never be reached because tsb_grow
never passes in a bad tsb_size. So if tsb_size ever gets a bad value
that is a kernel bug.
So replace the do_exit which is effectively an open coded version of
BUG() with an actuall call to BUG(). Making it clearer that this
is a case that can never, and should never happen.
Cc: David Miller <davem@davemloft.net>
Cc: sparclinux@vger.kernel.org
Link: https://lkml.kernel.org/r/20211020174406.17889-8-ebiederm@xmission.com
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
| -rw-r--r-- | arch/sparc/mm/tsb.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/sparc/mm/tsb.c b/arch/sparc/mm/tsb.c index 0dce4b7ff73e..912205787161 100644 --- a/arch/sparc/mm/tsb.c +++ b/arch/sparc/mm/tsb.c @@ -266,7 +266,7 @@ static void setup_tsb_params(struct mm_struct *mm, unsigned long tsb_idx, unsign default: printk(KERN_ERR "TSB[%s:%d]: Impossible TSB size %lu, killing process.\n", current->comm, current->pid, tsb_bytes); - do_exit(SIGSEGV); + BUG(); } tte |= pte_sz_bits(page_sz); |