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authorKees Cook <keescook@chromium.org>2018-06-29 11:48:50 -0700
committerBorislav Petkov <bp@suse.de>2018-07-09 11:33:02 +0200
commit6663484b4e2d98f5609dc1b90fe4c242dd8fe18a (patch)
tree613906b2b343dab28743ee97f4e24ac1727f5145 /drivers/edac
parent6c974d4dfafe5e9ee754f2a6fba0eb1864f1649e (diff)
downloadlinux-6663484b4e2d98f5609dc1b90fe4c242dd8fe18a.tar.bz2
EDAC, thunderx: Remove VLA usage
In the quest to remove all stack VLA usage from the kernel[1], switch to using a kmalloc-allocated buffer instead of stack space. This should be fine since the existing routine is allocating memory too. Signed-off-by: Kees Cook <keescook@chromium.org> Acked-by: Jan Glauber <jglauber@cavium.com> Cc: David Daney <david.daney@cavium.com> Cc: linux-edac <linux-edac@vger.kernel.org> Link: http://lkml.kernel.org/r/20180629184850.GA37464@beast Link: https://lkml.kernel.org/r/CA+55aFzCG-zNmZwX4A2FQpadafLfEzK6CC=qPXydAacU1RqZWA@mail.gmail.com [1] Signed-off-by: Borislav Petkov <bp@suse.de>
Diffstat (limited to 'drivers/edac')
-rw-r--r--drivers/edac/thunderx_edac.c14
1 files changed, 9 insertions, 5 deletions
diff --git a/drivers/edac/thunderx_edac.c b/drivers/edac/thunderx_edac.c
index 4803c6468bab..c009d94f40c5 100644
--- a/drivers/edac/thunderx_edac.c
+++ b/drivers/edac/thunderx_edac.c
@@ -408,26 +408,29 @@ static ssize_t thunderx_lmc_inject_ecc_write(struct file *file,
size_t count, loff_t *ppos)
{
struct thunderx_lmc *lmc = file->private_data;
-
unsigned int cline_size = cache_line_size();
-
- u8 tmp[cline_size];
+ u8 *tmp;
void __iomem *addr;
unsigned int offs, timeout = 100000;
atomic_set(&lmc->ecc_int, 0);
lmc->mem = alloc_pages_node(lmc->node, GFP_KERNEL, 0);
-
if (!lmc->mem)
return -ENOMEM;
+ tmp = kmalloc(cline_size, GFP_KERNEL);
+ if (!tmp) {
+ __free_pages(lmc->mem, 0);
+ return -ENOMEM;
+ }
+
addr = page_address(lmc->mem);
while (!atomic_read(&lmc->ecc_int) && timeout--) {
stop_machine(inject_ecc_fn, lmc, NULL);
- for (offs = 0; offs < PAGE_SIZE; offs += sizeof(tmp)) {
+ for (offs = 0; offs < PAGE_SIZE; offs += cline_size) {
/*
* Do a load from the previously rigged location
* This should generate an error interrupt.
@@ -437,6 +440,7 @@ static ssize_t thunderx_lmc_inject_ecc_write(struct file *file,
}
}
+ kfree(tmp);
__free_pages(lmc->mem, 0);
return count;