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| author | Jason A. Donenfeld <Jason@zx2c4.com> | 2022-11-08 13:37:55 +0100 |
|---|---|---|
| committer | Linus Walleij <linus.walleij@linaro.org> | 2022-11-08 21:13:56 +0100 |
| commit | 65b0e307a1a9193571db12910f382f84195a3d29 (patch) | |
| tree | 804a671f14dc9527f078ce1053d4ab64b926eafc /drivers/soc/ux500 | |
| parent | b29ea0e7e8122a11e9336fb89e96ca7ccdb314ae (diff) | |
| download | linux-65b0e307a1a9193571db12910f382f84195a3d29.tar.bz2 | |
ARM: ux500: do not directly dereference __iomem
Sparse reports that calling add_device_randomness() on `uid` is a
violation of address spaces. And indeed the next usage uses readl()
properly, but that was left out when passing it toadd_device_
randomness(). So instead copy the whole thing to the stack first.
Fixes: 4040d10a3d44 ("ARM: ux500: add DB serial number to entropy pool")
Cc: Linus Walleij <linus.walleij@linaro.org>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/all/202210230819.loF90KDh-lkp@intel.com/
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Link: https://lore.kernel.org/r/20221108123755.207438-1-Jason@zx2c4.com
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'drivers/soc/ux500')
| -rw-r--r-- | drivers/soc/ux500/ux500-soc-id.c | 10 |
1 files changed, 4 insertions, 6 deletions
diff --git a/drivers/soc/ux500/ux500-soc-id.c b/drivers/soc/ux500/ux500-soc-id.c index a9472e0e5d61..27d6e25a0115 100644 --- a/drivers/soc/ux500/ux500-soc-id.c +++ b/drivers/soc/ux500/ux500-soc-id.c @@ -167,20 +167,18 @@ ATTRIBUTE_GROUPS(ux500_soc); static const char *db8500_read_soc_id(struct device_node *backupram) { void __iomem *base; - void __iomem *uid; const char *retstr; + u32 uid[5]; base = of_iomap(backupram, 0); if (!base) return NULL; - uid = base + 0x1fc0; + memcpy_fromio(uid, base + 0x1fc0, sizeof(uid)); /* Throw these device-specific numbers into the entropy pool */ - add_device_randomness(uid, 0x14); + add_device_randomness(uid, sizeof(uid)); retstr = kasprintf(GFP_KERNEL, "%08x%08x%08x%08x%08x", - readl((u32 *)uid+0), - readl((u32 *)uid+1), readl((u32 *)uid+2), - readl((u32 *)uid+3), readl((u32 *)uid+4)); + uid[0], uid[1], uid[2], uid[3], uid[4]); iounmap(base); return retstr; } |