crosstool-ng: patches/uClibc/0.9.29/100-fix-mmap.patch@7af68e6083aa

     1 --- uClibc-0.9.29.oorig/test/mmap/mmap2.c	(revision 0)

     2 +++ uClibc-0.9.29/test/mmap/mmap2.c	(revision 18616)

     3 @@ -0,0 +1,41 @@

     4 +/* When trying to map /dev/mem with offset 0xFFFFF000 on the ARM platform, mmap

     5 + * returns -EOVERFLOW.

     6 + *

     7 + * Since off_t is defined as a long int and the sign bit is set in the address,

     8 + * the shift operation shifts in ones instead of zeroes

     9 + * from the left. This results the offset sent to the kernel function becomes

    10 + * 0xFFFFFFFF instead of 0x000FFFFF with MMAP2_PAGE_SHIFT set to 12.

    11 + */

    12 +

    13 +#include <unistd.h>

    14 +#include <stdio.h>

    15 +#include <stdlib.h>

    16 +#include <string.h>

    17 +#include <errno.h>

    18 +#include <fcntl.h>

    19 +#include <sys/mman.h>

    20 +

    21 +#define FATAL do { fprintf(stderr, "Error at line %d, file %s (%d) [%s]\n", \

    22 +  __LINE__, __FILE__, errno, strerror(errno)); exit(1); } while(0)

    23 +

    24 +#define MAP_SIZE 4096UL

    25 +#define MAP_MASK (MAP_SIZE - 1)

    26 +

    27 +int main(int argc, char **argv) {

    28 +    void* map_base = 0;

    29 +    int fd;

    30 +    off_t target = 0xfffff000;

    31 +    if((fd = open("/dev/mem", O_RDWR | O_SYNC)) == -1) FATAL;

    32 +    printf("/dev/mem opened.\n");

    33 +    fflush(stdout);

    34 +

    35 +   /* Map one page */

    36 +    map_base = mmap(0, MAP_SIZE, PROT_READ | PROT_WRITE, MAP_SHARED,

    37 +                        fd, target & ~MAP_MASK);

    38 +    if(map_base == (void *) -1) FATAL;

    39 +    printf("Memory mapped at address %p.\n", map_base);

    40 +    fflush(stdout);

    41 +    if(munmap(map_base, MAP_SIZE) == -1) FATAL;

    42 +    close(fd);

    43 +    return 0;

    44 +}

    45 --- uClibc-0.9.29.oorig/libc/sysdeps/linux/arm/mmap.c	(revision 18615)

    46 +++ uClibc-0.9.29/libc/sysdeps/linux/arm/mmap.c	(revision 18616)

    47 @@ -27,7 +27,6 @@ __ptr_t mmap(__ptr_t addr, size_t len, i

    49  #elif defined  (__NR_mmap2)

    50  #define __NR__mmap __NR_mmap2

    51 -

    52  #ifndef MMAP2_PAGE_SHIFT

    53  # define MMAP2_PAGE_SHIFT 12

    54  #endif

    55 @@ -39,9 +38,17 @@ __ptr_t mmap(__ptr_t addr, size_t len, i

    56  {

    57    /* check if offset is page aligned */

    58      if (offset & ((1 << MMAP2_PAGE_SHIFT) - 1))

    59 +    {

    60 +        __set_errno(EINVAL);

    61          return MAP_FAILED;

    62 +    }

    63 +#ifdef __USE_FILE_OFFSET64

    64 +  return (__ptr_t) _mmap (addr, len, prot, flags,

    65 +						  fd,((__u_quad_t) offset >> MMAP2_PAGE_SHIFT));

    66 +#else

    67    return (__ptr_t) _mmap (addr, len, prot, flags,

    68 -						  fd,(off_t) (offset >> MMAP2_PAGE_SHIFT));

    69 +                          fd,((__u_long) offset >> MMAP2_PAGE_SHIFT));

    70 +#endif

    71  }

    72  #elif defined (__NR_mmap)

    73  # define __NR__mmap __NR_mmap

    74 --- uClibc-0.9.29.oorig/libc/sysdeps/linux/common/mmap64.c	(revision 18615)

    75 +++ uClibc-0.9.29/libc/sysdeps/linux/common/mmap64.c	(revision 18616)

    76 @@ -58,8 +58,13 @@ __ptr_t mmap64(__ptr_t addr, size_t len,

    77  		__set_errno(EINVAL);

    78  		return MAP_FAILED;

    79  	}

    80 -

    81 -	return __syscall_mmap2(addr, len, prot, flags, fd, (off_t) (offset >> MMAP2_PAGE_SHIFT));

    82 +#ifdef __USE_FILE_OFFSET64

    83 +  return __syscall_mmap2(addr, len, prot, flags,

    84 +                         fd,((__u_quad_t)offset >> MMAP2_PAGE_SHIFT));

    85 +#else

    86 +   return __syscall_mmap2(addr, len, prot, flags,

    87 +                          fd,((__u_long)offset >> MMAP2_PAGE_SHIFT));

    88 +#endif

    89  }

    91  # endif

author	"Yann E. MORIN" <yann.morin.1998@anciens.enib.fr>
	Mon Jan 03 23:40:22 2011 +0100 (2011-01-03)
changeset 2267	7af68e6083aa
parent 291	64c57f736ec3
permissions	-rw-r--r--