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authorJakub Kicinski <jakub.kicinski@netronome.com>2018-09-04 07:37:33 -0700
committerDavid S. Miller <davem@davemloft.net>2018-09-05 22:17:07 -0700
commite84b2f2db2eaf025fb5bcec7223b749a9554174a (patch)
tree2ddb815e9b5b5b4dcc7ec0d94fd2f3e96e258837
parent31e380f38f6d508f280658ed17fe54d817fedea2 (diff)
nfp: validate rtsym accesses fall within the symbol
With the accesses to rtsyms now all going via special helpers we can easily make sure the driver is not reading past the end of the symbol. Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com> Reviewed-by: Francois H. Theron <francois.theron@netronome.com> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--drivers/net/ethernet/netronome/nfp/nfpcore/nfp_rtsym.c48
1 files changed, 45 insertions, 3 deletions
diff --git a/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_rtsym.c b/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_rtsym.c
index 5e416e14e46a..1ad0a015572e 100644
--- a/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_rtsym.c
+++ b/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_rtsym.c
@@ -39,6 +39,8 @@
* Espen Skoglund <espen.skoglund@netronome.com>
* Francois H. Theron <francois.theron@netronome.com>
*/
+
+#include <asm/unaligned.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
@@ -285,15 +287,23 @@ nfp_rtsym_to_dest(struct nfp_cpp *cpp, const struct nfp_rtsym *sym,
int __nfp_rtsym_read(struct nfp_cpp *cpp, const struct nfp_rtsym *sym,
u8 action, u8 token, u64 off, void *buf, size_t len)
{
+ u64 sym_size = nfp_rtsym_size(sym);
u32 cpp_id;
u64 addr;
int err;
+ if (off > sym_size) {
+ nfp_err(cpp, "rtsym '%s': read out of bounds: off: %lld + len: %zd > size: %lld\n",
+ sym->name, off, len, sym_size);
+ return -ENXIO;
+ }
+ len = min_t(size_t, len, sym_size - off);
+
if (sym->type == NFP_RTSYM_TYPE_ABS) {
- __le64 tmp = cpu_to_le64(sym->addr);
+ u8 tmp[8];
- len = min(len, sizeof(tmp));
- memcpy(buf, &tmp, len);
+ put_unaligned_le64(sym->addr, tmp);
+ memcpy(buf, &tmp[off], len);
return len;
}
@@ -318,6 +328,12 @@ int __nfp_rtsym_readl(struct nfp_cpp *cpp, const struct nfp_rtsym *sym,
u64 addr;
int err;
+ if (off + 4 > nfp_rtsym_size(sym)) {
+ nfp_err(cpp, "rtsym '%s': readl out of bounds: off: %lld + 4 > size: %lld\n",
+ sym->name, off, nfp_rtsym_size(sym));
+ return -ENXIO;
+ }
+
err = nfp_rtsym_to_dest(cpp, sym, action, token, off, &cpp_id, &addr);
if (err)
return err;
@@ -338,6 +354,12 @@ int __nfp_rtsym_readq(struct nfp_cpp *cpp, const struct nfp_rtsym *sym,
u64 addr;
int err;
+ if (off + 8 > nfp_rtsym_size(sym)) {
+ nfp_err(cpp, "rtsym '%s': readq out of bounds: off: %lld + 8 > size: %lld\n",
+ sym->name, off, nfp_rtsym_size(sym));
+ return -ENXIO;
+ }
+
if (sym->type == NFP_RTSYM_TYPE_ABS) {
*value = sym->addr;
return 0;
@@ -359,10 +381,18 @@ int nfp_rtsym_readq(struct nfp_cpp *cpp, const struct nfp_rtsym *sym, u64 off,
int __nfp_rtsym_write(struct nfp_cpp *cpp, const struct nfp_rtsym *sym,
u8 action, u8 token, u64 off, void *buf, size_t len)
{
+ u64 sym_size = nfp_rtsym_size(sym);
u32 cpp_id;
u64 addr;
int err;
+ if (off > sym_size) {
+ nfp_err(cpp, "rtsym '%s': write out of bounds: off: %lld + len: %zd > size: %lld\n",
+ sym->name, off, len, sym_size);
+ return -ENXIO;
+ }
+ len = min_t(size_t, len, sym_size - off);
+
err = nfp_rtsym_to_dest(cpp, sym, action, token, off, &cpp_id, &addr);
if (err)
return err;
@@ -383,6 +413,12 @@ int __nfp_rtsym_writel(struct nfp_cpp *cpp, const struct nfp_rtsym *sym,
u64 addr;
int err;
+ if (off + 4 > nfp_rtsym_size(sym)) {
+ nfp_err(cpp, "rtsym '%s': writel out of bounds: off: %lld + 4 > size: %lld\n",
+ sym->name, off, nfp_rtsym_size(sym));
+ return -ENXIO;
+ }
+
err = nfp_rtsym_to_dest(cpp, sym, action, token, off, &cpp_id, &addr);
if (err)
return err;
@@ -403,6 +439,12 @@ int __nfp_rtsym_writeq(struct nfp_cpp *cpp, const struct nfp_rtsym *sym,
u64 addr;
int err;
+ if (off + 8 > nfp_rtsym_size(sym)) {
+ nfp_err(cpp, "rtsym '%s': writeq out of bounds: off: %lld + 8 > size: %lld\n",
+ sym->name, off, nfp_rtsym_size(sym));
+ return -ENXIO;
+ }
+
err = nfp_rtsym_to_dest(cpp, sym, action, token, off, &cpp_id, &addr);
if (err)
return err;