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accel/habanalabs: refactor deprecated strncpy to strscpy_pad
`strncpy` is deprecated for use on NUL-terminated destination strings [1]. We see that `prop->cpucp_info.card_name` is supposed to be NUL-terminated based on its usage within `__hwmon_device_register()` (wherein it's called "name"): | if (name && (!strlen(name) || strpbrk(name, "-* \t\n"))) | dev_warn(dev, | "hwmon: '%s' is not a valid name attribute, please fix\n", | name); A suitable replacement is `strscpy_pad` [2] due to the fact that it guarantees both NUL-termination and NUL-padding on its destination buffer. NUL-padding on `prop->cpucp_info.card_name` is not strictly necessary as `hdev->prop` is explicitly zero-initialized but should be used regardless as it gets copied out to userspace directly -- as per Kees' suggestion. Link: https://www.kernel.org/doc/html/latest/process/deprecated.html#strncpy-on-nul-terminated-strings [1] Link: https://manpages.debian.org/testing/linux-manual-4.8/strscpy.9.en.html [2] Link: https://github.com/KSPP/linux/issues/90 Cc: linux-hardening@vger.kernel.org Signed-off-by: Justin Stitt <justinstitt@google.com> Suggested-by: Kees Cook <keescook@chromium.org> Reviewed-by: Kees Cook <keescook@chromium.org> Signed-off-by: Oded Gabbay <ogabbay@kernel.org>
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@ -664,7 +664,7 @@ static int gaudi_set_fixed_properties(struct hl_device *hdev)
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prop->pcie_dbi_base_address = mmPCIE_DBI_BASE;
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prop->pcie_aux_dbi_reg_addr = CFG_BASE + mmPCIE_AUX_DBI;
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strncpy(prop->cpucp_info.card_name, GAUDI_DEFAULT_CARD_NAME,
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strscpy_pad(prop->cpucp_info.card_name, GAUDI_DEFAULT_CARD_NAME,
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CARD_NAME_MAX_LEN);
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prop->max_pending_cs = GAUDI_MAX_PENDING_CS;
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@ -8004,7 +8004,7 @@ static int gaudi_cpucp_info_get(struct hl_device *hdev)
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return rc;
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if (!strlen(prop->cpucp_info.card_name))
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strncpy(prop->cpucp_info.card_name, GAUDI_DEFAULT_CARD_NAME,
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strscpy_pad(prop->cpucp_info.card_name, GAUDI_DEFAULT_CARD_NAME,
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CARD_NAME_MAX_LEN);
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hdev->card_type = le32_to_cpu(hdev->asic_prop.cpucp_info.card_type);
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@ -2528,7 +2528,7 @@ static int gaudi2_set_fixed_properties(struct hl_device *hdev)
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prop->pcie_dbi_base_address = CFG_BASE + mmPCIE_DBI_BASE;
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prop->pcie_aux_dbi_reg_addr = CFG_BASE + mmPCIE_AUX_DBI;
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strncpy(prop->cpucp_info.card_name, GAUDI2_DEFAULT_CARD_NAME, CARD_NAME_MAX_LEN);
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strscpy_pad(prop->cpucp_info.card_name, GAUDI2_DEFAULT_CARD_NAME, CARD_NAME_MAX_LEN);
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prop->mme_master_slave_mode = 1;
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@ -2981,7 +2981,8 @@ static int gaudi2_cpucp_info_get(struct hl_device *hdev)
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}
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if (!strlen(prop->cpucp_info.card_name))
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strncpy(prop->cpucp_info.card_name, GAUDI2_DEFAULT_CARD_NAME, CARD_NAME_MAX_LEN);
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strscpy_pad(prop->cpucp_info.card_name, GAUDI2_DEFAULT_CARD_NAME,
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CARD_NAME_MAX_LEN);
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/* Overwrite binning masks with the actual binning values from F/W */
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hdev->dram_binning = prop->cpucp_info.dram_binning_mask;
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@ -466,7 +466,7 @@ int goya_set_fixed_properties(struct hl_device *hdev)
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prop->pcie_dbi_base_address = mmPCIE_DBI_BASE;
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prop->pcie_aux_dbi_reg_addr = CFG_BASE + mmPCIE_AUX_DBI;
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strncpy(prop->cpucp_info.card_name, GOYA_DEFAULT_CARD_NAME,
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strscpy_pad(prop->cpucp_info.card_name, GOYA_DEFAULT_CARD_NAME,
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CARD_NAME_MAX_LEN);
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prop->max_pending_cs = GOYA_MAX_PENDING_CS;
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@ -5122,7 +5122,7 @@ int goya_cpucp_info_get(struct hl_device *hdev)
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}
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if (!strlen(prop->cpucp_info.card_name))
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strncpy(prop->cpucp_info.card_name, GOYA_DEFAULT_CARD_NAME,
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strscpy_pad(prop->cpucp_info.card_name, GOYA_DEFAULT_CARD_NAME,
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CARD_NAME_MAX_LEN);
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return 0;
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