diff options
-rw-r--r-- | fs/exec.c | 38 | ||||
-rw-r--r-- | include/linux/coredump.h | 34 |
2 files changed, 40 insertions, 32 deletions
@@ -2014,3 +2014,41 @@ fail_creds: | |||
2014 | fail: | 2014 | fail: |
2015 | return; | 2015 | return; |
2016 | } | 2016 | } |
2017 | |||
2018 | /* | ||
2019 | * Core dumping helper functions. These are the only things you should | ||
2020 | * do on a core-file: use only these functions to write out all the | ||
2021 | * necessary info. | ||
2022 | */ | ||
2023 | int dump_write(struct file *file, const void *addr, int nr) | ||
2024 | { | ||
2025 | return access_ok(VERIFY_READ, addr, nr) && file->f_op->write(file, addr, nr, &file->f_pos) == nr; | ||
2026 | } | ||
2027 | |||
2028 | int dump_seek(struct file *file, loff_t off) | ||
2029 | { | ||
2030 | int ret = 1; | ||
2031 | |||
2032 | if (file->f_op->llseek && file->f_op->llseek != no_llseek) { | ||
2033 | if (file->f_op->llseek(file, off, SEEK_CUR) < 0) | ||
2034 | return 0; | ||
2035 | } else { | ||
2036 | char *buf = (char *)get_zeroed_page(GFP_KERNEL); | ||
2037 | |||
2038 | if (!buf) | ||
2039 | return 0; | ||
2040 | while (off > 0) { | ||
2041 | unsigned long n = off; | ||
2042 | |||
2043 | if (n > PAGE_SIZE) | ||
2044 | n = PAGE_SIZE; | ||
2045 | if (!dump_write(file, buf, n)) { | ||
2046 | ret = 0; | ||
2047 | break; | ||
2048 | } | ||
2049 | off -= n; | ||
2050 | } | ||
2051 | free_page((unsigned long)buf); | ||
2052 | } | ||
2053 | return ret; | ||
2054 | } | ||
diff --git a/include/linux/coredump.h b/include/linux/coredump.h index 59579cfee6a0..ba4b85a6d9b8 100644 --- a/include/linux/coredump.h +++ b/include/linux/coredump.h | |||
@@ -9,37 +9,7 @@ | |||
9 | * These are the only things you should do on a core-file: use only these | 9 | * These are the only things you should do on a core-file: use only these |
10 | * functions to write out all the necessary info. | 10 | * functions to write out all the necessary info. |
11 | */ | 11 | */ |
12 | static inline int dump_write(struct file *file, const void *addr, int nr) | 12 | extern int dump_write(struct file *file, const void *addr, int nr); |
13 | { | 13 | extern int dump_seek(struct file *file, loff_t off); |
14 | return access_ok(VERIFY_READ, addr, nr) && file->f_op->write(file, addr, nr, &file->f_pos) == nr; | ||
15 | } | ||
16 | |||
17 | static inline int dump_seek(struct file *file, loff_t off) | ||
18 | { | ||
19 | int ret = 1; | ||
20 | |||
21 | if (file->f_op->llseek && file->f_op->llseek != no_llseek) { | ||
22 | if (file->f_op->llseek(file, off, SEEK_CUR) < 0) | ||
23 | return 0; | ||
24 | } else { | ||
25 | char *buf = (char *)get_zeroed_page(GFP_KERNEL); | ||
26 | |||
27 | if (!buf) | ||
28 | return 0; | ||
29 | while (off > 0) { | ||
30 | unsigned long n = off; | ||
31 | |||
32 | if (n > PAGE_SIZE) | ||
33 | n = PAGE_SIZE; | ||
34 | if (!dump_write(file, buf, n)) { | ||
35 | ret = 0; | ||
36 | break; | ||
37 | } | ||
38 | off -= n; | ||
39 | } | ||
40 | free_page((unsigned long)buf); | ||
41 | } | ||
42 | return ret; | ||
43 | } | ||
44 | 14 | ||
45 | #endif /* _LINUX_COREDUMP_H */ | 15 | #endif /* _LINUX_COREDUMP_H */ |