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authorJeff Dike <jdike@addtoit.com>2006-06-30 01:55:54 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-06-30 11:25:37 -0700
commitc2b7a4bb30008dc256d63802e02b6fb950958443 (patch)
tree355e20a2295099dad5878c2034d39739e984d9d1 /arch/um
parentdd673bca474a199fb8d1b6a311832592977ecb5f (diff)
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[PATCH] uml: fix /proc/mounts parsing boundary condition
When parsing /proc/mounts looking for a tmpfs mount on /dev/shm, if a string that we are looking for if split across reads, then it won't be recognized. Fix this by refilling the buffer whenever we advance the cursor. Signed-off-by: Jeff Dike <jdike@addtoit.com> Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch/um')
-rw-r--r--arch/um/os-Linux/mem.c14
1 files changed, 12 insertions, 2 deletions
diff --git a/arch/um/os-Linux/mem.c b/arch/um/os-Linux/mem.c
index c6432e729241..d24d1a960523 100644
--- a/arch/um/os-Linux/mem.c
+++ b/arch/um/os-Linux/mem.c
@@ -55,7 +55,7 @@ static void __init find_tempdir(void)
*/
static int next(int fd, char *buf, int size, char c)
{
- int n;
+ int n, len;
char *ptr;
while((ptr = strchr(buf, c)) == NULL){
@@ -69,7 +69,17 @@ static int next(int fd, char *buf, int size, char c)
}
ptr++;
- memmove(buf, ptr, strlen(ptr) + 1);
+ len = strlen(ptr);
+ memmove(buf, ptr, len + 1);
+
+ /* Refill the buffer so that if there's a partial string that we care
+ * about, it will be completed, and we can recognize it.
+ */
+ n = read(fd, &buf[len], size - len - 1);
+ if(n < 0)
+ return -errno;
+
+ buf[len + n] = '\0';
return 1;
}