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Merge branch 'PHP-8.2' into PHP-8.3

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* PHP-8.2:
  Fix potential OOB read in zend_dirname() on Windows
This commit is contained in:
Christoph M. Becker 2024-11-29 22:09:15 +01:00
commit 65070bb46c
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3 changed files with 9 additions and 3 deletions
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1
NEWS
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@ -19,6 +19,7 @@ PHP NEWS
. Fixed bug GH-16630 (UAF in lexer with encoding translation and heredocs).
(nielsdos)
. Fix is_zend_ptr() huge block comparison. (nielsdos)
. Fixed potential OOB read in zend_dirname() on Windows. (cmb)
- Curl:
. Fixed bug GH-16802 (open_basedir bypass using curl extension). (nielsdos)

6
Zend/zend_compile.c
View file

@ -2122,7 +2122,7 @@ ZEND_API size_t zend_dirname(char *path, size_t len)
}
/* Strip trailing slashes */
while (end >= path && IS_SLASH_P(end)) {
while (end >= path && IS_SLASH_P_EX(end, end == path)) {
end--;
}
if (end < path) {
@ -2133,7 +2133,7 @@ ZEND_API size_t zend_dirname(char *path, size_t len)
}
/* Strip filename */
while (end >= path && !IS_SLASH_P(end)) {
while (end >= path && !IS_SLASH_P_EX(end, end == path)) {
end--;
}
if (end < path) {
@ -2144,7 +2144,7 @@ ZEND_API size_t zend_dirname(char *path, size_t len)
}
/* Strip slashes which came before the file name */
while (end >= path && IS_SLASH_P(end)) {
while (end >= path && IS_SLASH_P_EX(end, end == path)) {
end--;
}
if (end < path) {

5
Zend/zend_virtual_cwd.h
View file

@ -73,8 +73,11 @@ typedef unsigned short mode_t;
#define DEFAULT_SLASH '\\'
#define DEFAULT_DIR_SEPARATOR ';'
#define IS_SLASH(c) ((c) == '/' || (c) == '\\')
// IS_SLASH_P() may read the previous char on Windows, which may be OOB; use IS_SLASH_P_EX() instead
#define IS_SLASH_P(c) (*(c) == '/' || \
(*(c) == '\\' && !IsDBCSLeadByte(*(c-1))))
#define IS_SLASH_P_EX(c, first_byte) (*(c) == '/' || \
(*(c) == '\\' && ((first_byte) || !IsDBCSLeadByte(*(c-1)))))
/* COPY_WHEN_ABSOLUTE is 2 under Win32 because by chance both regular absolute paths
in the file system and UNC paths need copying of two characters */
@ -108,7 +111,9 @@ typedef unsigned short mode_t;
#endif
#define IS_SLASH(c) ((c) == '/')
// IS_SLASH_P() may read the previous char on Windows, which may be OOB; use IS_SLASH_P_EX() instead
#define IS_SLASH_P(c) (*(c) == '/')
#define IS_SLASH_P_EX(c, first_byte) IS_SLASH_P(c)
#endif