From e8dd273d199f5bbe295a8e3d8b777c5505b6b2e1 Mon Sep 17 00:00:00 2001 From: Salah Triki Date: Thu, 17 Sep 2026 14:00:52 +0100 Subject: iio: proximity: isl29501: Fix return type of isl29501_register_write isl29501_register_write() was returning a u32 instead of an int. Since the function returns negative error codes (such as -ERANGE or return values from i2c_smbus_write_byte_data()), returning an unsigned integer type prevents callers from correctly checking for negative error conditions. Fix this by changing the function return type from u32 to int. This was found through manual code review. Fixes: 1c28799257bc ("iio: light: isl29501: Add support for the ISL29501 ToF sensor.") Signed-off-by: Salah Triki Reviewed-by: Joshua Crofts Cc: stable@vger.kernel.org Signed-off-by: Jonathan Cameron --- scripts/insert-sys-cert.c | 410 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 410 insertions(+) create mode 100644 scripts/insert-sys-cert.c (limited to 'scripts/insert-sys-cert.c') diff --git a/scripts/insert-sys-cert.c b/scripts/insert-sys-cert.c new file mode 100644 index 000000000..8902836c2 --- /dev/null +++ b/scripts/insert-sys-cert.c @@ -0,0 +1,410 @@ +/* Write the contents of the into kernel symbol system_extra_cert + * + * Copyright (C) IBM Corporation, 2015 + * + * Author: Mehmet Kayaalp + * + * This software may be used and distributed according to the terms + * of the GNU General Public License, incorporated herein by reference. + * + * Usage: insert-sys-cert [-s -b -c + */ + +#define _GNU_SOURCE +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define CERT_SYM "system_extra_cert" +#define USED_SYM "system_extra_cert_used" +#define LSIZE_SYM "system_certificate_list_size" + +#define info(format, args...) fprintf(stderr, "INFO: " format, ## args) +#define warn(format, args...) fprintf(stdout, "WARNING: " format, ## args) +#define err(format, args...) fprintf(stderr, "ERROR: " format, ## args) + +#if UINTPTR_MAX == 0xffffffff +#define CURRENT_ELFCLASS ELFCLASS32 +#define Elf_Ehdr Elf32_Ehdr +#define Elf_Shdr Elf32_Shdr +#define Elf_Sym Elf32_Sym +#else +#define CURRENT_ELFCLASS ELFCLASS64 +#define Elf_Ehdr Elf64_Ehdr +#define Elf_Shdr Elf64_Shdr +#define Elf_Sym Elf64_Sym +#endif + +static unsigned char endianness(void) +{ + uint16_t two_byte = 0x00FF; + uint8_t low_address = *((uint8_t *)&two_byte); + + if (low_address == 0) + return ELFDATA2MSB; + else + return ELFDATA2LSB; +} + +struct sym { + char *name; + unsigned long address; + unsigned long offset; + void *content; + int size; +}; + +static unsigned long get_offset_from_address(Elf_Ehdr *hdr, unsigned long addr) +{ + Elf_Shdr *x; + unsigned int i, num_sections; + + x = (void *)hdr + hdr->e_shoff; + if (hdr->e_shnum == SHN_UNDEF) + num_sections = x[0].sh_size; + else + num_sections = hdr->e_shnum; + + for (i = 1; i < num_sections; i++) { + unsigned long start = x[i].sh_addr; + unsigned long end = start + x[i].sh_size; + unsigned long offset = x[i].sh_offset; + + if (addr >= start && addr <= end) + return addr - start + offset; + } + return 0; +} + + +#define LINE_SIZE 100 + +static void get_symbol_from_map(Elf_Ehdr *hdr, FILE *f, char *name, + struct sym *s) +{ + char l[LINE_SIZE]; + char *w, *p, *n; + + s->size = 0; + s->address = 0; + s->offset = 0; + if (fseek(f, 0, SEEK_SET) != 0) { + perror("File seek failed"); + exit(EXIT_FAILURE); + } + while (fgets(l, LINE_SIZE, f)) { + p = strchr(l, '\n'); + if (!p) { + err("Missing line ending.\n"); + return; + } + n = strstr(l, name); + if (n) + break; + } + if (!n) { + err("Unable to find symbol: %s\n", name); + return; + } + w = strchr(l, ' '); + if (!w) + return; + + *w = '\0'; + s->address = strtoul(l, NULL, 16); + if (s->address == 0) + return; + s->offset = get_offset_from_address(hdr, s->address); + s->name = name; + s->content = (void *)hdr + s->offset; +} + +static Elf_Sym *find_elf_symbol(Elf_Ehdr *hdr, Elf_Shdr *symtab, char *name) +{ + Elf_Sym *sym, *symtab_start; + char *strtab, *symname; + unsigned int link; + Elf_Shdr *x; + int i, n; + + x = (void *)hdr + hdr->e_shoff; + link = symtab->sh_link; + symtab_start = (void *)hdr + symtab->sh_offset; + n = symtab->sh_size / symtab->sh_entsize; + strtab = (void *)hdr + x[link].sh_offset; + + for (i = 0; i < n; i++) { + sym = &symtab_start[i]; + symname = strtab + sym->st_name; + if (strcmp(symname, name) == 0) + return sym; + } + err("Unable to find symbol: %s\n", name); + return NULL; +} + +static void get_symbol_from_table(Elf_Ehdr *hdr, Elf_Shdr *symtab, + char *name, struct sym *s) +{ + Elf_Shdr *sec; + int secndx; + Elf_Sym *elf_sym; + Elf_Shdr *x; + + x = (void *)hdr + hdr->e_shoff; + s->size = 0; + s->address = 0; + s->offset = 0; + elf_sym = find_elf_symbol(hdr, symtab, name); + if (!elf_sym) + return; + secndx = elf_sym->st_shndx; + if (!secndx) + return; + sec = &x[secndx]; + s->size = elf_sym->st_size; + s->address = elf_sym->st_value; + s->offset = s->address - sec->sh_addr + + sec->sh_offset; + s->name = name; + s->content = (void *)hdr + s->offset; +} + +static Elf_Shdr *get_symbol_table(Elf_Ehdr *hdr) +{ + Elf_Shdr *x; + unsigned int i, num_sections; + + x = (void *)hdr + hdr->e_shoff; + if (hdr->e_shnum == SHN_UNDEF) + num_sections = x[0].sh_size; + else + num_sections = hdr->e_shnum; + + for (i = 1; i < num_sections; i++) + if (x[i].sh_type == SHT_SYMTAB) + return &x[i]; + return NULL; +} + +static void *map_file(char *file_name, int *size) +{ + struct stat st; + void *map; + int fd; + + fd = open(file_name, O_RDWR); + if (fd < 0) { + perror(file_name); + return NULL; + } + if (fstat(fd, &st)) { + perror("Could not determine file size"); + close(fd); + return NULL; + } + *size = st.st_size; + map = mmap(NULL, *size, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0); + if (map == MAP_FAILED) { + perror("Mapping to memory failed"); + close(fd); + return NULL; + } + close(fd); + return map; +} + +static char *read_file(char *file_name, int *size) +{ + struct stat st; + char *buf; + int fd; + + fd = open(file_name, O_RDONLY); + if (fd < 0) { + perror(file_name); + return NULL; + } + if (fstat(fd, &st)) { + perror("Could not determine file size"); + close(fd); + return NULL; + } + *size = st.st_size; + buf = malloc(*size); + if (!buf) { + perror("Allocating memory failed"); + close(fd); + return NULL; + } + if (read(fd, buf, *size) != *size) { + perror("File read failed"); + close(fd); + return NULL; + } + close(fd); + return buf; +} + +static void print_sym(Elf_Ehdr *hdr, struct sym *s) +{ + info("sym: %s\n", s->name); + info("addr: 0x%lx\n", s->address); + info("size: %d\n", s->size); + info("offset: 0x%lx\n", (unsigned long)s->offset); +} + +static void print_usage(char *e) +{ + printf("Usage %s [-s ] -b -c \n", e); +} + +int main(int argc, char **argv) +{ + char *system_map_file = NULL; + char *vmlinux_file = NULL; + char *cert_file = NULL; + int vmlinux_size; + int cert_size; + Elf_Ehdr *hdr; + char *cert; + FILE *system_map; + unsigned long *lsize; + int *used; + int opt; + Elf_Shdr *symtab = NULL; + struct sym cert_sym, lsize_sym, used_sym; + + while ((opt = getopt(argc, argv, "b:c:s:")) != -1) { + switch (opt) { + case 's': + system_map_file = optarg; + break; + case 'b': + vmlinux_file = optarg; + break; + case 'c': + cert_file = optarg; + break; + default: + break; + } + } + + if (!vmlinux_file || !cert_file) { + print_usage(argv[0]); + exit(EXIT_FAILURE); + } + + cert = read_file(cert_file, &cert_size); + if (!cert) + exit(EXIT_FAILURE); + + hdr = map_file(vmlinux_file, &vmlinux_size); + if (!hdr) + exit(EXIT_FAILURE); + + if (vmlinux_size < sizeof(*hdr)) { + err("Invalid ELF file.\n"); + exit(EXIT_FAILURE); + } + + if ((hdr->e_ident[EI_MAG0] != ELFMAG0) || + (hdr->e_ident[EI_MAG1] != ELFMAG1) || + (hdr->e_ident[EI_MAG2] != ELFMAG2) || + (hdr->e_ident[EI_MAG3] != ELFMAG3)) { + err("Invalid ELF magic.\n"); + exit(EXIT_FAILURE); + } + + if (hdr->e_ident[EI_CLASS] != CURRENT_ELFCLASS) { + err("ELF class mismatch.\n"); + exit(EXIT_FAILURE); + } + + if (hdr->e_ident[EI_DATA] != endianness()) { + err("ELF endian mismatch.\n"); + exit(EXIT_FAILURE); + } + + if (hdr->e_shoff > vmlinux_size) { + err("Could not find section header.\n"); + exit(EXIT_FAILURE); + } + + symtab = get_symbol_table(hdr); + if (!symtab) { + warn("Could not find the symbol table.\n"); + if (!system_map_file) { + err("Please provide a System.map file.\n"); + print_usage(argv[0]); + exit(EXIT_FAILURE); + } + + system_map = fopen(system_map_file, "r"); + if (!system_map) { + perror(system_map_file); + exit(EXIT_FAILURE); + } + get_symbol_from_map(hdr, system_map, CERT_SYM, &cert_sym); + get_symbol_from_map(hdr, system_map, USED_SYM, &used_sym); + get_symbol_from_map(hdr, system_map, LSIZE_SYM, &lsize_sym); + cert_sym.size = used_sym.address - cert_sym.address; + } else { + info("Symbol table found.\n"); + if (system_map_file) + warn("System.map is ignored.\n"); + get_symbol_from_table(hdr, symtab, CERT_SYM, &cert_sym); + get_symbol_from_table(hdr, symtab, USED_SYM, &used_sym); + get_symbol_from_table(hdr, symtab, LSIZE_SYM, &lsize_sym); + } + + if (!cert_sym.offset || !lsize_sym.offset || !used_sym.offset) + exit(EXIT_FAILURE); + + print_sym(hdr, &cert_sym); + print_sym(hdr, &used_sym); + print_sym(hdr, &lsize_sym); + + lsize = (unsigned long *)lsize_sym.content; + used = (int *)used_sym.content; + + if (cert_sym.size < cert_size) { + err("Certificate is larger than the reserved area!\n"); + exit(EXIT_FAILURE); + } + + /* If the existing cert is the same, don't overwrite */ + if (cert_size == *used && + strncmp(cert_sym.content, cert, cert_size) == 0) { + warn("Certificate was already inserted.\n"); + exit(EXIT_SUCCESS); + } + + if (*used > 0) + warn("Replacing previously inserted certificate.\n"); + + memcpy(cert_sym.content, cert, cert_size); + if (cert_size < cert_sym.size) + memset(cert_sym.content + cert_size, + 0, cert_sym.size - cert_size); + + *lsize = *lsize + cert_size - *used; + *used = cert_size; + info("Inserted the contents of %s into %lx.\n", cert_file, + cert_sym.address); + info("Used %d bytes out of %d bytes reserved.\n", *used, + cert_sym.size); + exit(EXIT_SUCCESS); +} -- cgit v1.3.1