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Bottomley" , Helge Deller , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H. Peter Anvin" , Ian Abbott , H Hartley Sweeten , Tony Luck , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Matthew Brost , "=?UTF-8?q?Thomas=20Hellstr=C3=B6m?=" , Rodrigo Vivi , Dmitry Torokhov , Matthias Schwarzott , Mauro Carvalho Chehab , Tony Nguyen , Przemek Kitszel , Andrew Lunn , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Arend van Spriel , Rob Herring , Saravana Kannan , Krzysztof Kozlowski , Sylwester Nawrocki , Peter Griffin , Alim Akhtar , Linus Walleij , Anil Gurumurthy , Sudarsana Kalluru , "Martin K. Petersen" , Trond Myklebust , Anna Schumaker , Mike Marshall , Martin Brandenburg , Kees Cook , Jiri Pirko , Simon Horman , Chuck Lever , Jeff Layton , NeilBrown , Olga Kornievskaia , Dai Ngo , Tom Talpey , Jaroslav Kysela , Takashi Iwai , Andrew Morton , "Mike Rapoport (Microsoft)" , Kanglong Wang , Tiezhu Yang , Qiang Ma , Randy Dunlap , Pengpeng Hou , Ard Biesheuvel , Breno Leitao , Thorsten Blum , Harshit Mogalapalli , Greg Kroah-Hartman , Lyude Paul , Ashutosh Desai , Imre Deak , Dmitry Baryshkov , Johan Hovold , Johannes Berg , Miri Korenblit , Alexander Stein , Cryolitia PukNgae , Jiaming Zhang , Will Porter , Cen Zhang , "=?UTF-8?q?C=C3=A1ssio=20Gabriel?=" , Rong Zhang , Arun Raghavan , linux-arm-kernel@lists.infradead.org, loongarch@lists.linux.dev, linux-mips@vger.kernel.org, linux-parisc@vger.kernel.org, linux-edac@vger.kernel.org, dri-devel@lists.freedesktop.org, intel-xe@lists.freedesktop.org, linux-input@vger.kernel.org, linux-media@vger.kernel.org, intel-wired-lan@lists.osuosl.org, netdev@vger.kernel.org, linux-wireless@vger.kernel.org, brcm80211@lists.linux.dev, brcm80211-dev-list.pdl@broadcom.com, devicetree@vger.kernel.org, linux-samsung-soc@vger.kernel.org, linux-gpio@vger.kernel.org, linux-scsi@vger.kernel.org, linux-nfs@vger.kernel.org, devel@lists.orangefs.org, linux-hardening@vger.kernel.org, linux-sound@vger.kernel.org Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Mailman-Approved-At: Tue, 15 Sep 2026 17:17:37 +0000 X-BeenThere: intel-wired-lan@osuosl.org X-Mailman-Version: 2.1.30 Precedence: list List-Id: Intel Wired Ethernet Linux Kernel Driver Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: intel-wired-lan-bounces@osuosl.org The threaded ISR handlers (thunderx_ocx_com_threaded_isr(), thunderx_ocx_lnk_threaded_isr(), and thunderx_l2c_threaded_isr()) build multi-line error reports by formatting register details into a scratch buffer and appending them to "msg" with strlcat(). In preparation for removing the deprecated strlcat() API[1], refactor the ISR handlers to construct error messages using struct seq_buf. Additionally, fix two bugs in decode_register(): initialize "str[0] =3D '\0= '" so callers do not append stale buffer contents when no error bits match, and stop iterating if snprintf() truncates the buffer to avoid underflowing the remaining "size" counter. Link: https://github.com/KSPP/linux/issues/370 [1] Cc: codemender-patching+linux@google.com Assisted-by: AI:Claude-3-5-Sonnet [editor_update_file, shell_command_run] Signed-off-by: Bill Wendling --- Cc: Russell King Cc: Huacai Chen Cc: WANG Xuerui Cc: Thomas Bogendoerfer Cc: "James E.J. Bottomley" Cc: Helge Deller Cc: Thomas Gleixner Cc: Ingo Molnar Cc: Borislav Petkov Cc: Dave Hansen Cc: x86@kernel.org Cc: "H. Peter Anvin" Cc: Ian Abbott Cc: H Hartley Sweeten Cc: Tony Luck Cc: Maarten Lankhorst Cc: Maxime Ripard Cc: Thomas Zimmermann Cc: David Airlie Cc: Simona Vetter Cc: Matthew Brost Cc: "Thomas Hellstr=C3=B6m" Cc: Rodrigo Vivi Cc: Dmitry Torokhov Cc: Matthias Schwarzott Cc: Mauro Carvalho Chehab Cc: Tony Nguyen Cc: Przemek Kitszel Cc: Andrew Lunn Cc: "David S. Miller" Cc: Eric Dumazet Cc: Jakub Kicinski Cc: Paolo Abeni Cc: Arend van Spriel Cc: Rob Herring Cc: Saravana Kannan Cc: Krzysztof Kozlowski Cc: Sylwester Nawrocki Cc: Peter Griffin Cc: Alim Akhtar Cc: Linus Walleij Cc: Anil Gurumurthy Cc: Sudarsana Kalluru Cc: "Martin K. Petersen" Cc: Trond Myklebust Cc: Anna Schumaker Cc: Mike Marshall Cc: Martin Brandenburg Cc: Kees Cook Cc: Jiri Pirko Cc: Simon Horman Cc: Chuck Lever Cc: Jeff Layton Cc: NeilBrown Cc: Olga Kornievskaia Cc: Dai Ngo Cc: Tom Talpey Cc: Jaroslav Kysela Cc: Takashi Iwai Cc: Bill Wendling Cc: Andrew Morton Cc: "Mike Rapoport (Microsoft)" Cc: Kanglong Wang Cc: Tiezhu Yang Cc: Qiang Ma Cc: Randy Dunlap Cc: Pengpeng Hou Cc: Ard Biesheuvel Cc: Breno Leitao Cc: Thorsten Blum Cc: Harshit Mogalapalli Cc: Greg Kroah-Hartman Cc: Lyude Paul Cc: Ashutosh Desai Cc: Imre Deak Cc: Dmitry Baryshkov Cc: Johan Hovold Cc: Johannes Berg Cc: Miri Korenblit Cc: Alexander Stein Cc: Cryolitia PukNgae Cc: Jiaming Zhang Cc: Will Porter Cc: Cen Zhang Cc: "C=C3=A1ssio Gabriel" Cc: Rong Zhang Cc: Arun Raghavan Cc: linux-arm-kernel@lists.infradead.org Cc: linux-kernel@vger.kernel.org Cc: loongarch@lists.linux.dev Cc: linux-mips@vger.kernel.org Cc: linux-parisc@vger.kernel.org Cc: linux-edac@vger.kernel.org Cc: dri-devel@lists.freedesktop.org Cc: intel-xe@lists.freedesktop.org Cc: linux-input@vger.kernel.org Cc: linux-media@vger.kernel.org Cc: intel-wired-lan@lists.osuosl.org Cc: netdev@vger.kernel.org Cc: linux-wireless@vger.kernel.org Cc: brcm80211@lists.linux.dev Cc: brcm80211-dev-list.pdl@broadcom.com Cc: devicetree@vger.kernel.org Cc: linux-samsung-soc@vger.kernel.org Cc: linux-gpio@vger.kernel.org Cc: linux-scsi@vger.kernel.org Cc: linux-nfs@vger.kernel.org Cc: devel@lists.orangefs.org Cc: linux-hardening@vger.kernel.org Cc: linux-sound@vger.kernel.org --- drivers/edac/thunderx_edac.c | 64 ++++++++++++++++++++++-------------- 1 file changed, 39 insertions(+), 25 deletions(-) diff --git a/drivers/edac/thunderx_edac.c b/drivers/edac/thunderx_edac.c index e7c335ca0c36..4e3781815b6d 100644 --- a/drivers/edac/thunderx_edac.c +++ b/drivers/edac/thunderx_edac.c @@ -20,6 +20,7 @@ #include #include #include +#include =20 #include =20 @@ -47,12 +48,17 @@ static void decode_register(char *str, size_t size, { int ret =3D 0; =20 + if (size > 0) + str[0] =3D '\0'; + while (descr->type && descr->mask && descr->descr) { if (reg & descr->mask) { ret =3D snprintf(str, size, "\n\t%s, %s", descr->type =3D=3D ERR_CORRECTED ? "Corrected" : "Uncorrected", descr->descr); + if (ret < 0 || ret >=3D size) + break; str +=3D ret; size -=3D ret; } @@ -1115,35 +1121,37 @@ static irqreturn_t thunderx_ocx_com_threaded_isr(in= t irq, void *irq_id) =20 while (CIRC_CNT(ocx->com_ring_head, ocx->com_ring_tail, ARRAY_SIZE(ocx->com_err_ctx))) { + struct seq_buf s; + tail =3D ring_pos(ocx->com_ring_tail, ARRAY_SIZE(ocx->com_err_ctx)); ctx =3D &ocx->com_err_ctx[tail]; =20 - snprintf(msg, OCX_MESSAGE_SIZE, "%s: OCX_COM_INT: %016llx", - ocx->edac_dev->ctl_name, ctx->reg_com_int); + seq_buf_init(&s, msg, OCX_MESSAGE_SIZE); + + seq_buf_printf(&s, "%s: OCX_COM_INT: %016llx", + ocx->edac_dev->ctl_name, ctx->reg_com_int); =20 decode_register(other, OCX_OTHER_SIZE, ocx_com_errors, ctx->reg_com_int); =20 - strlcat(msg, other, OCX_MESSAGE_SIZE); + seq_buf_puts(&s, other); =20 for (lane =3D 0; lane < OCX_RX_LANES; lane++) if (ctx->reg_com_int & BIT(lane)) { - snprintf(other, OCX_OTHER_SIZE, - "\n\tOCX_LNE_INT[%02d]: %016llx OCX_LNE_STAT11[%02d]: %016llx", - lane, ctx->reg_lane_int[lane], - lane, ctx->reg_lane_stat11[lane]); - - strlcat(msg, other, OCX_MESSAGE_SIZE); + seq_buf_printf(&s, + "\n\tOCX_LNE_INT[%02d]: %016llx OCX_LNE_STAT11[%02d]: %016llx"= , + lane, ctx->reg_lane_int[lane], + lane, ctx->reg_lane_stat11[lane]); =20 decode_register(other, OCX_OTHER_SIZE, ocx_lane_errors, ctx->reg_lane_int[lane]); - strlcat(msg, other, OCX_MESSAGE_SIZE); + seq_buf_puts(&s, other); } =20 if (ctx->reg_com_int & OCX_COM_INT_CE) - edac_device_handle_ce(ocx->edac_dev, 0, 0, msg); + edac_device_handle_ce(ocx->edac_dev, 0, 0, seq_buf_str(&s)); =20 ocx->com_ring_tail++; } @@ -1196,25 +1204,28 @@ static irqreturn_t thunderx_ocx_lnk_threaded_isr(in= t irq, void *irq_id) =20 while (CIRC_CNT(ocx->link_ring_head, ocx->link_ring_tail, ARRAY_SIZE(ocx->link_err_ctx))) { + struct seq_buf s; + tail =3D ring_pos(ocx->link_ring_head, ARRAY_SIZE(ocx->link_err_ctx)); =20 ctx =3D &ocx->link_err_ctx[tail]; =20 - snprintf(msg, OCX_MESSAGE_SIZE, - "%s: OCX_COM_LINK_INT[%d]: %016llx", - ocx->edac_dev->ctl_name, - ctx->link, ctx->reg_com_link_int); + seq_buf_init(&s, msg, OCX_MESSAGE_SIZE); + + seq_buf_printf(&s, "%s: OCX_COM_LINK_INT[%d]: %016llx", + ocx->edac_dev->ctl_name, + ctx->link, ctx->reg_com_link_int); =20 decode_register(other, OCX_OTHER_SIZE, ocx_com_link_errors, ctx->reg_com_link_int); =20 - strlcat(msg, other, OCX_MESSAGE_SIZE); + seq_buf_puts(&s, other); =20 if (ctx->reg_com_link_int & OCX_COM_LINK_INT_UE) - edac_device_handle_ue(ocx->edac_dev, 0, 0, msg); + edac_device_handle_ue(ocx->edac_dev, 0, 0, seq_buf_str(&s)); else if (ctx->reg_com_link_int & OCX_COM_LINK_INT_CE) - edac_device_handle_ce(ocx->edac_dev, 0, 0, msg); + edac_device_handle_ce(ocx->edac_dev, 0, 0, seq_buf_str(&s)); =20 ocx->link_ring_tail++; } @@ -1880,22 +1891,25 @@ static irqreturn_t thunderx_l2c_threaded_isr(int ir= q, void *irq_id) =20 while (CIRC_CNT(l2c->ring_head, l2c->ring_tail, ARRAY_SIZE(l2c->err_ctx))) { + struct seq_buf s; + tail =3D ring_pos(l2c->ring_tail, ARRAY_SIZE(l2c->err_ctx)); ctx =3D &l2c->err_ctx[tail]; =20 - snprintf(msg, L2C_MESSAGE_SIZE, - "%s: %s: %016llx, %s: %016llx", - l2c->edac_dev->ctl_name, reg_int_name, ctx->reg_int, - ctx->reg_ext_name, ctx->reg_ext); + seq_buf_init(&s, msg, L2C_MESSAGE_SIZE); + + seq_buf_printf(&s, "%s: %s: %016llx, %s: %016llx", + l2c->edac_dev->ctl_name, reg_int_name, ctx->reg_int, + ctx->reg_ext_name, ctx->reg_ext); =20 decode_register(other, L2C_OTHER_SIZE, l2_errors, ctx->reg_int); =20 - strlcat(msg, other, L2C_MESSAGE_SIZE); + seq_buf_puts(&s, other); =20 if (ctx->reg_int & mask_ue) - edac_device_handle_ue(l2c->edac_dev, 0, 0, msg); + edac_device_handle_ue(l2c->edac_dev, 0, 0, seq_buf_str(&s)); else if (ctx->reg_int & mask_ce) - edac_device_handle_ce(l2c->edac_dev, 0, 0, msg); + edac_device_handle_ce(l2c->edac_dev, 0, 0, seq_buf_str(&s)); =20 l2c->ring_tail++; } --=20 2.55.0.1032.g73a4cd73de-goog