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esp_rom: remove functions which depend on sizeof(struct stat)

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...and all their callers.

With the upcoming switch from sizeof(time_t)==4 to sizeof(time_t)==8,
sizeof(struct stat) is also increasing.

A few newlib functions present in ROM allocate 'struct stat' on the
stack and call _fstat_r on this structure. The implementation of
fstat is provided in ESP-IDF. This implementation will often do
memset(st, 0, sizeof(*st)), where st is 'struct stat*', before setting
some fields of this structure. If IDF is built with sizeof(st)
different from sizeof(st) which ROM was built with, this will lead
to an out-of-bounds write and a stack corruption.

This commit removes problematic ROM functions from the linker script.
Here are the functions which allocate 'struct stat':
* _isatty_r (in ROM)
* __swhatbuf_r, called by __smakebuf_r, called by __swsetup_r and
  __srefill_r (in ROM)
* _fseeko_r (not in ROM)
* glob2 (not in ROM)
* _gettemp (not in ROM)

As a result, these functions are used from libc.a, and use correct
size of 'stat' structure.

Closes https://github.com/espressif/esp-idf/issues/7980
This commit is contained in:
Ivan Grokhotkov 2022-01-06 15:20:04 +01:00
parent 5d47efb72d
commit 24c20d188e
12 changed files with 103 additions and 48 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

32
components/esp_rom/CMakeLists.txt
View File

@ -97,14 +97,15 @@ else() # Regular app build
# then all time functions from the ROM memory will not be linked.
# Instead, those functions can be used from the toolchain by ESP-IDF.
rom_linker_script("newlib-time")
endif()
# Include in newlib nano from ROM only if SPIRAM cache workaround is disabled
# and sizeof(time_t) == 4
if(CONFIG_NEWLIB_NANO_FORMAT)
rom_linker_script("newlib-nano")
endif()
endif()
endif()
if(NOT CONFIG_SPI_FLASH_ROM_DRIVER_PATCH)
rom_linker_script("spiflash")
@ -119,10 +120,19 @@ else() # Regular app build
rom_linker_script("newlib-data")
rom_linker_script("spiflash")
if(NOT CONFIG_SDK_TOOLCHAIN_SUPPORTS_TIME_WIDE_64_BITS)
# If SDK_TOOLCHAIN_SUPPORTS_TIME_WIDE_64_BITS option is defined
# then all time functions from the ROM memory will not be linked.
# Instead, those functions can be used from the toolchain by ESP-IDF.
if(CONFIG_NEWLIB_NANO_FORMAT)
rom_linker_script("newlib-nano")
endif()
rom_linker_script("newlib-time")
endif()
# descirptors used by ROM code
target_sources(${COMPONENT_LIB} PRIVATE "esp32s2/usb_descriptors.c")
@ -130,18 +140,34 @@ else() # Regular app build
rom_linker_script("newlib")
rom_linker_script("version")
if(NOT CONFIG_SDK_TOOLCHAIN_SUPPORTS_TIME_WIDE_64_BITS)
# If SDK_TOOLCHAIN_SUPPORTS_TIME_WIDE_64_BITS option is defined
# then all time functions from the ROM memory will not be linked.
# Instead, those functions can be used from the toolchain by ESP-IDF.
if(CONFIG_NEWLIB_NANO_FORMAT)
rom_linker_script("newlib-nano")
endif()
rom_linker_script("newlib-time")
endif()
elseif(target STREQUAL "esp32c3")
rom_linker_script("newlib")
rom_linker_script("version")
if(NOT CONFIG_SDK_TOOLCHAIN_SUPPORTS_TIME_WIDE_64_BITS)
# If SDK_TOOLCHAIN_SUPPORTS_TIME_WIDE_64_BITS option is defined
# then all time functions from the ROM memory will not be linked.
# Instead, those functions can be used from the toolchain by ESP-IDF.
if(CONFIG_NEWLIB_NANO_FORMAT)
rom_linker_script("newlib-nano")
endif()
rom_linker_script("newlib-time")
endif()
if(CONFIG_ESP32C3_REV_MIN_3)
rom_linker_script("eco3")
endif()
@ -150,19 +176,23 @@ else() # Regular app build
rom_linker_script("newlib")
rom_linker_script("version")
if(NOT CONFIG_SDK_TOOLCHAIN_SUPPORTS_TIME_WIDE_64_BITS)
if(CONFIG_NEWLIB_NANO_FORMAT)
rom_linker_script("newlib-nano")
endif()
endif()
elseif(target STREQUAL "esp8684")
rom_linker_script("newlib")
rom_linker_script("version")
rom_linker_script("mbedtls")
if(NOT CONFIG_SDK_TOOLCHAIN_SUPPORTS_TIME_WIDE_64_BITS)
if(CONFIG_NEWLIB_NANO_FORMAT)
rom_linker_script("newlib-nano")
endif()
endif()
endif()
if(CONFIG_IDF_TARGET_ARCH_XTENSA)
target_link_libraries(${COMPONENT_LIB} INTERFACE "-Wl,--wrap=longjmp")

5
components/esp_rom/esp32/ld/esp32.rom.newlib-funcs.ld
View File

@ -43,7 +43,6 @@ _getenv_r = 0x40001fbc;
isalnum = 0x40000f04;
isalpha = 0x40000f18;
isascii = 0x4000c20c;
_isatty_r = 0x40000ea0;
isblank = 0x40000f2c;
iscntrl = 0x40000f50;
isdigit = 0x40000f64;
@ -77,14 +76,11 @@ __sfmoreglue = 0x40001dc8;
__sfp = 0x40001e90;
__sfp_lock_acquire = 0x40001e08;
__sfp_lock_release = 0x40001e14;
__sfvwrite_r = 0x4005893c;
__sinit = 0x40001e38;
__sinit_lock_acquire = 0x40001e20;
__sinit_lock_release = 0x40001e2c;
__smakebuf_r = 0x40059108;
srand = 0x40001004;
__sread = 0x40001118;
__srefill_r = 0x400593d4;
__sseek = 0x40001184;
strcasecmp = 0x400011cc;
strcasestr = 0x40001210;
@ -122,7 +118,6 @@ __submore = 0x40058f3c;
__swbuf = 0x40058cb4;
__swbuf_r = 0x40058bec;
__swrite = 0x40001150;
__swsetup_r = 0x40058cc8;
toascii = 0x4000c720;
tolower = 0x40001868;
toupper = 0x40001884;

9
components/esp_rom/esp32/ld/esp32.rom.newlib-time.ld
View File

@ -27,3 +27,12 @@ _timezone = 0x3ffae0a0;
_tzname = 0x3ffae030;
_daylight = 0x3ffae0a4;
__month_lengths = 0x3ff9609c;
/* These functions don't use time_t, but use other structures which include time_t.
* For example, 'struct stat' contains time_t.
*/
_isatty_r = 0x40000ea0;
__sfvwrite_r = 0x4005893c;
__smakebuf_r = 0x40059108;
__srefill_r = 0x400593d4;
__swsetup_r = 0x40058cc8;

15
components/esp_rom/esp32c3/ld/esp32c3.rom.newlib-time.ld Normal file
View File

@ -0,0 +1,15 @@
/*
* SPDX-FileCopyrightText: 2022 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Apache-2.0
*/
/* These are the newlib functions and the .bss/.data symbols which are related to 'time_t'
or other structures which include 'time_t' (like 'struct stat').
These ROM functions were compiled with sizeof(time_t) == 4.
When compiling with sizeof(time_t) == 8, these functions should be excluded from the build.
*/
_isatty_r = 0x40000380;
PROVIDE( __smakebuf_r = 0x4000046c );
PROVIDE( __swhatbuf_r = 0x40000470 );
PROVIDE( __swsetup_r = 0x4000047c );

4
components/esp_rom/esp32c3/ld/esp32c3.rom.newlib.ld
View File

@ -25,7 +25,6 @@ strncmp = 0x40000370;
strlen = 0x40000374;
strstr = 0x40000378;
bzero = 0x4000037c;
_isatty_r = 0x40000380;
sbrk = 0x40000384;
isalnum = 0x40000388;
isalpha = 0x4000038c;
@ -84,11 +83,8 @@ PROVIDE( fflush = 0x4000045c );
PROVIDE( _fflush_r = 0x40000460 );
PROVIDE( _fwalk = 0x40000464 );
PROVIDE( _fwalk_reent = 0x40000468 );
PROVIDE( __smakebuf_r = 0x4000046c );
PROVIDE( __swhatbuf_r = 0x40000470 );
PROVIDE( __swbuf_r = 0x40000474 );
__swbuf = 0x40000478;
PROVIDE( __swsetup_r = 0x4000047c );
/* Data (.data, .bss, .rodata) */
syscall_table_ptr = 0x3fcdffe0;
_global_impure_ptr = 0x3fcdffdc;

6
components/esp_rom/esp32h2/ld/rev1/esp32h2.rom.newlib.ld
View File

@ -1,5 +1,5 @@
/*
* SPDX-FileCopyrightText: 2020-2021 Espressif Systems (Shanghai) CO LTD
* SPDX-FileCopyrightText: 2020-2022 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Apache-2.0
*/
@ -31,7 +31,6 @@ strncmp = 0x40000378;
strlen = 0x4000037c;
strstr = 0x40000380;
bzero = 0x40000384;
_isatty_r = 0x40000388;
sbrk = 0x4000038c;
isalnum = 0x40000390;
isalpha = 0x40000394;
@ -90,11 +89,8 @@ PROVIDE( fflush = 0x40000464 );
PROVIDE( _fflush_r = 0x40000468 );
PROVIDE( _fwalk = 0x4000046c );
PROVIDE( _fwalk_reent = 0x40000470 );
PROVIDE( __smakebuf_r = 0x40000474 );
PROVIDE( __swhatbuf_r = 0x40000478 );
PROVIDE( __swbuf_r = 0x4000047c );
__swbuf = 0x40000480;
PROVIDE( __swsetup_r = 0x40000484 );
/* Data (.data, .bss, .rodata) */
syscall_table_ptr = 0x3fcdffdc;
_global_impure_ptr = 0x3fcdffd8;

6
components/esp_rom/esp32h2/ld/rev2/esp32h2.rom.newlib.ld
View File

@ -1,5 +1,5 @@
/*
* SPDX-FileCopyrightText: 2020-2021 Espressif Systems (Shanghai) CO LTD
* SPDX-FileCopyrightText: 2020-2022 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Apache-2.0
*/
@ -31,7 +31,6 @@ strncmp = 0x400004a4;
strlen = 0x400004a8;
strstr = 0x400004ac;
bzero = 0x400004b0;
_isatty_r = 0x400004b4;
sbrk = 0x400004b8;
isalnum = 0x400004bc;
isalpha = 0x400004c0;
@ -90,11 +89,8 @@ fflush = 0x40000590;
_fflush_r = 0x40000594;
_fwalk = 0x40000598;
_fwalk_reent = 0x4000059c;
__smakebuf_r = 0x400005a0;
__swhatbuf_r = 0x400005a4;
__swbuf_r = 0x400005a8;
__swbuf = 0x400005ac;
__swsetup_r = 0x400005b0;
_strtod_l = 0x400005b4;
_strtod_r = 0x400005b8;
strtod_l = 0x400005bc;

5
components/esp_rom/esp32s2/ld/esp32s2.rom.newlib-funcs.ld
View File

@ -29,7 +29,6 @@ _fwalk_reent = 0x4001bd24;
isalnum = 0x400078d8;
isalpha = 0x400078e8;
isascii = 0x4001aaec;
_isatty_r = 0x400078a0;
isblank = 0x400078f8;
iscntrl = 0x40007918;
isdigit = 0x40007930;
@ -66,11 +65,9 @@ __sfmoreglue = 0x4001a4c8;
__sfp = 0x4001a590;
__sfp_lock_acquire = 0x4001a508;
__sfp_lock_release = 0x4001a514;
__sfvwrite_r = 0x40001310;
__sinit = 0x4001a538;
__sinit_lock_acquire = 0x4001a520;
__sinit_lock_release = 0x4001a52c;
__smakebuf_r = 0x40001954;
srand = 0x40007a24;
__sread = 0x4001a660;
__sseek = 0x4001a6cc;
@ -104,9 +101,7 @@ strtok_r = 0x4001af7c;
strupr = 0x40008084;
__swbuf = 0x4000167c;
__swbuf_r = 0x400015bc;
__swhatbuf_r = 0x400018f8;
__swrite = 0x4001a698;
__swsetup_r = 0x40001690;
toascii = 0x4001af90;
tolower = 0x40008158;
toupper = 0x40008174;

16
components/esp_rom/esp32s2/ld/esp32s2.rom.newlib-time.ld Normal file
View File

@ -0,0 +1,16 @@
/*
* SPDX-FileCopyrightText: 2022 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Apache-2.0
*/
/* These are the newlib functions and the .bss/.data symbols which are related to 'time_t'
or other structures which include 'time_t' (like 'struct stat').
These ROM functions were compiled with sizeof(time_t) == 4.
When compiling with sizeof(time_t) == 8, these functions should be excluded from the build.
*/
__swsetup_r = 0x40001690;
__smakebuf_r = 0x40001954;
__swhatbuf_r = 0x400018f8;
__sfvwrite_r = 0x40001310;
_isatty_r = 0x400078a0;

15
components/esp_rom/esp32s3/ld/esp32s3.rom.newlib-time.ld Normal file
View File

@ -0,0 +1,15 @@
/*
* SPDX-FileCopyrightText: 2022 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Apache-2.0
*/
/* These are the newlib functions and the .bss/.data symbols which are related to 'time_t'
or other structures which include 'time_t' (like 'struct stat').
These ROM functions were compiled with sizeof(time_t) == 4.
When compiling with sizeof(time_t) == 8, these functions should be excluded from the build.
*/
_isatty_r = 0x4000126c;
PROVIDE( __smakebuf_r = 0x40001530 );
PROVIDE( __swsetup_r = 0x40001560 );
PROVIDE( __swhatbuf_r = 0x4000153c );

4
components/esp_rom/esp32s3/ld/esp32s3.rom.newlib.ld
View File

@ -25,7 +25,6 @@ strncmp = 0x4000123c;
strlen = 0x40001248;
strstr = 0x40001254;
bzero = 0x40001260;
_isatty_r = 0x4000126c;
sbrk = 0x40001278;
isalnum = 0x40001284;
isalpha = 0x40001290;
@ -84,11 +83,8 @@ PROVIDE( fflush = 0x40001500 );
PROVIDE( _fflush_r = 0x4000150c );
PROVIDE( _fwalk = 0x40001518 );
PROVIDE( _fwalk_reent = 0x40001524 );
PROVIDE( __smakebuf_r = 0x40001530 );
PROVIDE( __swhatbuf_r = 0x4000153c );
PROVIDE( __swbuf_r = 0x40001548 );
__swbuf = 0x40001554;
PROVIDE( __swsetup_r = 0x40001560 );
/* Data (.data, .bss, .rodata) */
syscall_table_ptr = 0x3fceffd4;
_global_impure_ptr = 0x3fceffd0;

6
components/esp_rom/esp8684/ld/esp8684.rom.newlib.ld
View File

@ -1,5 +1,5 @@
/*
* SPDX-FileCopyrightText: 2021 Espressif Systems (Shanghai) CO LTD
* SPDX-FileCopyrightText: 2021-2022 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Apache-2.0
*/
@ -30,7 +30,6 @@ strncmp = 0x400004a0;
strlen = 0x400004a4;
strstr = 0x400004a8;
bzero = 0x400004ac;
_isatty_r = 0x400004b0;
sbrk = 0x400004b4;
isalnum = 0x400004b8;
isalpha = 0x400004bc;
@ -89,11 +88,8 @@ fflush = 0x4000058c;
_fflush_r = 0x40000590;
_fwalk = 0x40000594;
_fwalk_reent = 0x40000598;
__smakebuf_r = 0x4000059c;
__swhatbuf_r = 0x400005a0;
__swbuf_r = 0x400005a4;
__swbuf = 0x400005a8;
__swsetup_r = 0x400005ac;
_strtod_l = 0x400005b0;
_strtod_r = 0x400005b4;
strtod_l = 0x400005b8;