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Thu, 10 Sep 2026 08:03:54 +0000 Message-ID: <2ec7a375-ef8c-4ecb-ad1b-cfbf3ce12b96@amd.com> Date: Thu, 10 Sep 2026 10:03:47 +0200 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 1/2] board: xilinx: Use strlcat() in board_name_decode() To: Sriram Sriram , u-boot@lists.u-boot-project.org Cc: Tom Rini , Drew Kluemke References: <20260909192047.217421-1-sriramsriram@linux.microsoft.com> <20260909192047.217421-2-sriramsriram@linux.microsoft.com> Content-Language: en-US From: Michal Simek Autocrypt: addr=michal.simek@amd.com; keydata= xsFNBFFuvDEBEAC9Amu3nk79+J+4xBOuM5XmDmljuukOc6mKB5bBYOa4SrWJZTjeGRf52VMc howHe8Y9nSbG92obZMqsdt+d/hmRu3fgwRYiiU97YJjUkCN5paHXyBb+3IdrLNGt8I7C9RMy svSoH4WcApYNqvB3rcMtJIna+HUhx8xOk+XCfyKJDnrSuKgx0Svj446qgM5fe7RyFOlGX/wF Ae63Hs0RkFo3I/+hLLJP6kwPnOEo3lkvzm3FMMy0D9VxT9e6Y3afe1UTQuhkg8PbABxhowzj SEnl0ICoqpBqqROV/w1fOlPrm4WSNlZJunYV4gTEustZf8j9FWncn3QzRhnQOSuzTPFbsbH5 WVxwDvgHLRTmBuMw1sqvCc7CofjsD1XM9bP3HOBwCxKaTyOxbPJh3D4AdD1u+cF/lj9Fj255 Es9aATHPvoDQmOzyyRNTQzupN8UtZ+/tB4mhgxWzorpbdItaSXWgdDPDtssJIC+d5+hskys8 B3jbv86lyM+4jh2URpnL1gqOPwnaf1zm/7sqoN3r64cml94q68jfY4lNTwjA/SnaS1DE9XXa XQlkhHgjSLyRjjsMsz+2A4otRLrBbumEUtSMlPfhTi8xUsj9ZfPIUz3fji8vmxZG/Da6jx/c a0UQdFFCL4Ay/EMSoGbQouzhC69OQLWNH3rMQbBvrRbiMJbEZwARAQABzSlNaWNoYWwgU2lt ZWsgKEFNRCkgPG1pY2hhbC5zaW1la0BhbWQuY29tPsLBlAQTAQgAPgIbAwULCQgHAgYVCgkI CwIEFgIDAQIeAQIXgBYhBGc1DJv1zO6bU2Q1ajd8fyH+PR+RBQJn8lwDBQkaRgbLAAoJEDd8 fyH+PR+RCNAP/iHkKbpP0XXfgfWqf8yyrFHjGPJSknERzxw0glxPztfC3UqeusQ0CPnbI85n uQdm5/zRgWr7wi8H2UMqFlfMW8/NH5Da7GOPc26NMTPA2ZG5S2SG2SGZj1Smq8mL4iueePiN x1qfWhVm7TfkDHUEmMAYq70sjFcvygyqHUCumpw36CMQSMyrxyEkbYm1NKORlnySAFHy2pOx nmXKSaL1yfof3JJLwNwtaBj76GKQILnlYx9QNnt6adCtrZLIhB3HGh4IRJyuiiM0aZi1G8ei 2ILx2n2LxUw7X6aAD0sYHtNKUCQMCBGQHzJLDYjEyy0kfYoLXV2P6K+7WYnRP+uV8g77Gl9a IuGvxgEUITjMakX3e8RjyZ5jmc5ZAsegfJ669oZJOzQouw/W9Qneb820rhA2CKK8BnmlkHP+ WB5yDks3gSHE/GlOWqRkVZ05sUjVmq/tZ1JEdOapWQovRQsueDjxXcMjgNo5e8ttCyMo44u1 pKXRJpR5l7/hBYWeMlcKvLwByep+FOGtKsv0xadMKr1M6wPZXkV83jMKxxRE9HlqWJLLUE1Q 0pDvn1EvlpDj9eED73iMBsrHu9cIk8aweTEbQ4bcKRGfGkXrCwle6xRiKSjXCdzWpOglNhjq 1g8Ak+G+ZR6r7QarL01BkdE2/WUOLHdGHB1hJxARbP2E3l46zsFNBFFuvDEBEACXqiX5h4IA 03fJOwh+82aQWeHVAEDpjDzK5hSSJZDE55KP8br1FZrgrjvQ9Ma7thSu1mbr+ydeIqoO1/iM fZA+DDPpvo6kscjep11bNhVa0JpHhwnMfHNTSHDMq9OXL9ZZpku/+OXtapISzIH336p4ZUUB 5asad8Ux70g4gmI92eLWBzFFdlyR4g1Vis511Nn481lsDO9LZhKyWelbif7FKKv4p3FRPSbB vEgh71V3NDCPlJJoiHiYaS8IN3uasV/S1+cxVbwz2WcUEZCpeHcY2qsQAEqp4GM7PF2G6gtz IOBUMk7fjku1mzlx4zP7uj87LGJTOAxQUJ1HHlx3Li+xu2oF9Vv101/fsCmptAAUMo7KiJgP Lu8TsP1migoOoSbGUMR0jQpUcKF2L2jaNVS6updvNjbRmFojK2y6A/Bc6WAKhtdv8/e0/Zby iVA7/EN5phZ1GugMJxOLHJ1eqw7DQ5CHcSQ5bOx0Yjmhg4PT6pbW3mB1w+ClAnxhAbyMsfBn XxvvcjWIPnBVlB2Z0YH/gizMDdM0Sa/HIz+q7JR7XkGL4MYeAM15m6O7hkCJcoFV7LMzkNKk OiCZ3E0JYDsMXvmh3S4EVWAG+buA+9beElCmXDcXPI4PinMPqpwmLNcEhPVMQfvAYRqQp2fg 1vTEyK58Ms+0a9L1k5MvvbFg9QARAQABwsF8BBgBCAAmAhsMFiEEZzUMm/XM7ptTZDVqN3x/ If49H5EFAmfyXCkFCRpGBvgACgkQN3x/If49H5GY5xAAoKWHRO/OlI7eMA8VaUgFInmphBAj fAgQbW6Zxl9ULaCcNSoJc2D0zYWXftDOJeXyVk5Gb8cMbLA1tIMSM/BgSAnT7As2KfcZDTXQ DJSZYWgYKc/YywLgUlpv4slFv5tjmoUvHK9w2DuFLW254pnUuhrdyTEaknEM+qOmPscWOs0R dR6mMTN0vBjnLUeYdy0xbaoefjT+tWBybXkVwLDd3d/+mOa9ZiAB7ynuVWu2ow/uGJx0hnRI LGfLsiPu47YQrQXu79r7RtVeAYwRh3ul7wx5LABWI6n31oEHxDH+1czVjKsiozRstEaUxuDZ jWRHq+AEIq79BTTopj2dnW+sZAsnVpQmc+nod6xR907pzt/HZL0WoWwRVkbg7hqtzKOBoju3 hftqVr0nx77oBZD6mSJsxM/QuJoaXaTX/a/QiB4Nwrja2jlM0lMUA/bGeM1tQwS7rJLaT3cT RBGSlJgyWtR8IQvX3rqHd6QrFi1poQ1/wpLummWO0adWes2U6I3GtD9vxO/cazWrWBDoQ8Da otYa9+7v0j0WOBTJaj16LFxdSRq/jZ1y/EIHs3Ysd85mUWXOB8xZ6h+WEMzqAvOt02oWJVbr ZLqxG/3ScDXZEUJ6EDJVoLAK50zMk87ece2+4GWGOKfFsiDfh7fnEMXQcykxuowBYUD0tMd2 mpwx1d8= In-Reply-To: <20260909192047.217421-2-sriramsriram@linux.microsoft.com> Content-Type: text/plain; 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It appends CONFIG_SYS_BOARD > and then, for every detected EEPROM descriptor, "-", desc->name (up to > 16 characters), "-rev" and desc->revision (up to 8 characters). > > The length check runs only after the loop, so it cannot prevent the > overflow it documents. Each descriptor contributes up to 29 characters, > so a base board plus a carrier card already exceeds the buffer, and the > data being concatenated comes from the EEPROM. > > Use strlcat() bounded to MAX_NAME_LENGTH so the writes are truncated > rather than overflowing the allocation. Truncation leaves a string of > MAX_NAME_LENGTH - 1 characters, so relax the check accordingly; > as written it could never fire once strlcat() is used. > > Signed-off-by: Drew Kluemke > Signed-off-by: Sriram Sriram > --- > board/xilinx/common/board.c | 20 ++++++++++++-------- > 1 file changed, 12 insertions(+), 8 deletions(-) > > diff --git a/board/xilinx/common/board.c b/board/xilinx/common/board.c > index f45b879736e..690991bb435 100644 > --- a/board/xilinx/common/board.c > +++ b/board/xilinx/common/board.c > @@ -590,38 +590,42 @@ char * __maybe_unused __weak board_name_decode(void) > > /* The first string should be soc name */ > if (!id) > - strcat(board_local_name, CONFIG_SYS_BOARD); > + strlcat(board_local_name, CONFIG_SYS_BOARD, > + MAX_NAME_LENGTH); I actually got a path (c&p below) for the same issue some days ago internally and also reviewed it already. But unfortunately it wasn't sent out yet. The difference is that it is checking len at the end of every loop to get out of it earlier. Thanks, Michal Author: Pranav Tilak AuthorDate: Wed Sep 9 10:13:09 2026 +0530 board: xilinx: Fix heap buffer overflow in board_name_decode() board_name_decode() builds the board name by repeatedly appending to a fixed MAX_NAME_LENGTH (50-byte) buffer with strcat(), and only checks for overflow once, after the entire loop over all detected nvmemX EEPROM devices has completed. If enough devices are present and their name/revision fields are long enough, strcat() can write past the end of the buffer before the overflow check is reached, resulting in heap memory corruption. Fix this by using strlcat() instead, which bounds every write to the destination buffer size and prevents overrunning the allocation. Use its return value to detect truncation during board name construction instead of relying on a single length check after all EEPROM devices have been processed. Fixes: 52ff1626cf4c ("xilinx: common: Enabling generic function for DT reselection") Signed-off-by: Pranav Tilak diff --git a/board/xilinx/common/board.c b/board/xilinx/common/board.c index bdccf0732d2a..964817d98e65 100644 --- a/board/xilinx/common/board.c +++ b/board/xilinx/common/board.c @@ -571,8 +571,9 @@ int __maybe_unused board_fit_config_name_match(const char *name) char * __maybe_unused __weak board_name_decode(void) { - char *board_local_name; struct xilinx_board_description *desc; + char *board_local_name; + size_t len = 0; int i, id; board_local_name = calloc(1, MAX_NAME_LENGTH); @@ -592,39 +593,36 @@ char * __maybe_unused __weak board_name_decode(void) /* The first string should be soc name */ if (!id) - strcat(board_local_name, CONFIG_SYS_BOARD); + len = strlcat(board_local_name, CONFIG_SYS_BOARD, MAX_NAME_LENGTH); /* * For two purpose here: * soc_name- eg: zynqmp- * and between base board and CC eg: ..revA-sck... */ - strcat(board_local_name, "-"); + len = strlcat(board_local_name, "-", MAX_NAME_LENGTH); if (desc->name[0]) { /* For DT composition name needs to be lowercase */ for (i = 0; i < sizeof(desc->name); i++) desc->name[i] = tolower(desc->name[i]); - strcat(board_local_name, desc->name); + len = strlcat(board_local_name, desc->name, MAX_NAME_LENGTH); } if (desc->revision[0]) { - strcat(board_local_name, "-rev"); + len = strlcat(board_local_name, "-rev", MAX_NAME_LENGTH); /* And revision needs to be uppercase */ for (i = 0; i < sizeof(desc->revision); i++) desc->revision[i] = toupper(desc->revision[i]); - strcat(board_local_name, desc->revision); + len = strlcat(board_local_name, desc->revision, MAX_NAME_LENGTH); } - } - /* - * Longer strings will end up with buffer overflow and potential - * attacks that's why check it - */ - if (strlen(board_local_name) >= MAX_NAME_LENGTH) - panic("Board name can't be determined\n"); + /* Reject truncated board names. */ + if (len >= MAX_NAME_LENGTH) + panic("Board name can't be determined\n"); + } if (strlen(board_local_name)) return board_local_name;